CN114594096B - Field core weathering layer automatic identification and stripping device and method - Google Patents

Abstract

The application discloses an automatic identifying and stripping device and method for a weathered layer of a field core, which relate to the technical field of unconventional oil and gas resource exploration, wherein the automatic identifying and stripping device for the weathered layer of the field core comprises the following components: an operation space system and a main control system; the working space system comprises an image acquisition system, a cutting working system, a rock core fixing system and a laser positioning system; the rock core fixing system is used for fixing the rock core; the laser positioning system is used for positioning the rock core and the rock core fixing system to acquire coordinate value data of the rock core and coordinate value data of the rock core fixing system, and transmitting the coordinate value data to the main control system; the image acquisition system comprises a dual-mode scanning camera capable of carrying out image acquisition and element surface scanning on the rock core, and the dual-mode scanning camera is provided with a standard lens and a focusing lens which can rotate, wherein the standard lens and the focusing lens can respectively rotate to the same working position, and the like. The method can solve the problems that the efficiency of manually stripping the weathered layer of the core is too low and the quality cannot be ensured.

Description

Field core weathering layer automatic identification and stripping device and method

Technical Field

The present invention relates to the technical field of unconventional oil and gas resource exploration, and in particular to a device and method for automatically identifying and stripping a weathered layer of a field rock core.

Background technique

With the gradual deepening of oil and gas exploration and development, unconventional oil and gas resources have received more and more attention. Shale oil and gas resources have huge reserves and have gradually replaced conventional oil and gas to become the country's main energy source. Marine shale accounts for a large proportion of shale oil and gas resources. For example, the marine shale of the Wufeng-Longmaxi Formation in southern China has become the main target layer for current exploration and development.

At present, shale oil and gas exploration mainly adopts a combination of laboratory analysis and testing and field exploration. Indoor experimental analysis samples mainly include downhole core samples and field profile outcrop samples. Core samples retain the original components of shale and can be used for various geological experimental analyses. However, in some highly evolved areas, core samples cannot be used for simulation experiments. Field outcrop samples can provide a supplement for core sample simulation experiments, but there is a problem of surface weathering of samples. Direct analysis and testing will seriously affect the precision and accuracy of the test results.

For example, the weathering layer on the surface of mudstone is mainly formed by the loose sediments formed by the interaction between the surface layer and atmospheric precipitation due to long-term exposure to the air, and it becomes relatively dense after being compacted. The main components _of the weathering layer include dihydrate gypsum, aqueous epsom salt and other expansive sulfate minerals, iron minerals with FeO, _Fe2O3 as the main components, and some clay minerals. Under geological conditions, the layered structure with reduced weathering degree from the surface weathering layer to the original rock is often: weathering layer, semi-weathering layer, transition layer and original rock layer. According to the color and bedding development characteristics of the weathering layer, the weathering degree can be graded as follows: Grade I: high weathering degree, light yellow or yellow-brown, bedding is not developed; Grade II: gray-black or brown-black, bedding is not obvious; Grade III: black, bedding and cracks are relatively developed.

The currently commonly used method for removing weathering from shale surfaces is manual mechanical crushing, which mainly uses a geological hammer to flatten the weathered surface, and uses sandpaper to repeatedly grind the inner layer after the outer layer is removed. This method is not only time-consuming and labor-intensive, but also has many uncontrollable factors, such as the force of the knocking, the location of the striking point, etc. If used improperly, it is easy to cause mechanical damage to the unweathered original rock sample, which is extremely inconvenient to operate. In view of the need to remove the weathered layer on the surface of the core, there is currently no relevant device that can efficiently and reliably meet the above needs.

Summary of the invention

In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a device and method for automatic identification and stripping of weathered layers of field cores, which can solve the problem of low efficiency and unguaranteed quality of manual stripping of weathered layers of cores.

The specific technical solution of the embodiment of the present invention is:

A field core weathering layer automatic identification and stripping device, the field core weathering layer automatic identification and stripping device comprises: an operating space system and a main control system; the operating space system comprises an image acquisition system, a cutting work system, a core fixing system and a laser positioning system; wherein,

The core fixing system is used to fix the core;

The laser positioning system is used to locate the core and the core fixing system to obtain coordinate value data of the core and the core fixing system, and send the coordinate value data to the main control system;

The image acquisition system includes a dual-mode scanning camera capable of performing image acquisition and elemental surface scanning on the core, the dual-mode scanning camera includes: an outer cylinder, an XRF analysis unit, a rotating member, a focusing lens, a standard lens, an image acquisition unit and a rotating drive mechanism for driving the rotating member to rotate, the XRF analysis unit is arranged in the outer cylinder, the focusing lens, the image acquisition unit and the standard lens are installed on the rotating member, the focusing lens can be used in conjunction with the XRF analysis unit to perform elemental distribution scanning on the core, the standard lens 211 and the image acquisition unit are used in conjunction with each other to perform image acquisition on the core, the focusing lens, the standard lens and the rotating shaft of the rotating member are at the same distance, the rotating drive mechanism can drive the rotating member to rotate so that the focusing lens and the standard lens can be respectively rotated to the same working position; the image acquisition system is used to send scanning image data 1 collected from the core by the standard lens and the image acquisition unit and scanning image data 2 collected by the focusing lens and the XRF analysis unit to the main control system;

The main control system is used to obtain a cutting instruction including a cutting path and tool selection according to the coordinate value data of the core, the coordinate value data of the core fixing system, the scanning image data 1 and the scanning image data 2, and send the cutting instruction to the cutting work system, wherein the cutting path is the boundary between the weathered layer and the original rock layer of the core;

The cutting working system includes a plurality of different cutting tools, and the cutting working system is used to receive the cutting instruction of the main control system, and select a suitable cutting tool according to the cutting instruction to cut the core according to the cutting path.

Preferably, the main control system includes a color gamut recognition module and a brittleness index calculation module;

The color gamut recognition module is used to perform color identification on the scanned image data 1 to determine the boundary between the weathered layer and the original rock layer, and then calculate the cutting path of the tool;

The brittleness index calculation module is used to calculate the brittleness index of the core according to the element content data in the second scanning image data, and determine the tool selection based on the brittleness index of the core.

Preferably, the core fixing system comprises: a cutting platform and a core fixing device;

The cutting platform comprises a horizontally placed sample box, and the sample box is in the shape of a cuboid;

The core fixing device is arranged at the bottom of the sample box, and the core fixing device includes a sample fixer; a fixing rod screwed on the side wall in the opposite direction of the fixer, and the fixing rod has a thread; an adjusting knob screwed on the fixing rod; there are at least four fixing rods, which are respectively used to resist the four directions of the top, bottom, left and right of the core to fix the core.

Preferably, the laser positioning system comprises: a laser space transmitter and a photodiode located above the core fixing system, the laser space transmitter is used to transmit laser signals to the core fixing system, and the photodiode is used to receive the laser signals reflected by the core fixing system; a laser space transmitter group is arranged at the four corners of the sample box, the laser space transmitter group is used in conjunction with the laser space transmitter and the photodiode, and the photodiode is also used to receive the laser signal emitted by the laser space transmitter group, the laser space transmitter group, the laser space transmitter and the photodiode are electrically connected to the main control system to determine the position of the laser space transmitter group at one of the corners of the sample box as the origin of the coordinate system, and establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis.

Preferably, the working process of the dual-mode scanning camera includes: using the lens located in the working position of the standard lens and the focusing lens to first scan the rock core, then rotating the rotating part to rotate the other lens to the working position, and then using the other lens located in the working position to scan the rock core.

Preferably, the cutting working system comprises: a first cylinder mechanism, a telescopic rod mechanism, a base, a second cylinder mechanism, a telescopic column mechanism, a first motor mechanism, a second motor mechanism, a third motor mechanism, a first mechanical arm, a second mechanical arm mechanism and a cutting mechanism; the two ends of the telescopic rod mechanism are respectively connected to the first cylinder mechanism and the base, the first cylinder mechanism drives the telescopic rod mechanism to telescope to control the base to move in the horizontal direction; the second cylinder mechanism is arranged on the base and connected to the telescopic column mechanism to control the telescopic column mechanism to telescope in the vertical direction, the first motor mechanism is arranged on the base, the telescopic column mechanism is transmission-connected with the first motor, the first motor mechanism drives the telescopic column mechanism to rotate around the axis of the telescopic column mechanism, one end of the first mechanical arm is connected to the upper end of the telescopic column mechanism through the second motor mechanism, one end of the second mechanical arm mechanism is connected to the other end of the first mechanical arm through the third motor mechanism, and the cutting mechanism is connected to the other end of the second mechanical arm mechanism; the position of the cutting mechanism in the vertical and horizontal directions is controlled by the rotation of the first motor mechanism and the second motor mechanism.

Preferably, the cutting mechanism includes a knife cover and four cutting units arranged in the knife cover, each of the cutting units includes: a micro-telescopic rod mechanism, a fourth motor mechanism, and a tool connected to the lower end of the micro-telescopic rod mechanism, the fourth motor mechanism can drive the micro-telescopic rod mechanism to rotate so that the micro-telescopic rod mechanism can be extended and retracted, thereby making the tool extend out of the knife cover, and the fourth motor mechanism can also drive the tool to rotate; the tools in the four cutting units are respectively made of tourmaline, tungsten steel, diamond and carbon nitride materials.

Preferably, the main control system includes a domain position identification module, which is used to establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis based on the laser signal received by the photodiode to determine the position of one of the laser space transmitter groups as the origin of the coordinate system, and take the core fixing system as the plane.

A method for automatically identifying and stripping weathered layers of a field core using any of the above-mentioned devices for automatically identifying and stripping weathered layers of a field core, the method comprising:

Install the core into the core fixing system for fixation, and install cutters of different hardness on the cutting working system;

After the core is installed and fixed, the core and the core fixing system are positioned by a laser positioning system to obtain coordinate value data of the core and the coordinate value data of the core fixing system, and send them to the main control system;

After the core is installed and fixed, the image acquisition system is used to acquire images and scan the element surface of the core, and the scanning image data 1 acquired by the standard lens and the image acquisition unit and the scanning image data 2 acquired by the focusing lens and the XRF analysis unit are sent to the main control system. During the scanning process, the core is first scanned by the lens located in the working position of the standard lens and the focusing lens, and then the rotating part is rotated to rotate the other lens to the working position, and then the core is scanned by the other lens located in the working position;

The main control system performs color identification on the scanned image data 1 through the color gamut recognition module to determine the boundary between the weathered layer and the original rock layer, and then calculates the cutting path of the tool according to the coordinate value data of the core and the coordinate value data of the core fixing system, calculates the brittleness index of the core according to the element content data in the scanned image data 2 through the brittleness index calculation module, and determines the tool selection based on the brittleness index of the core, and then the main control system sends the cutting instruction including the cutting path and tool selection to the cutting work system;

The cutting working system receives the cutting instruction from the main control system, selects a suitable tool according to the cutting instruction, and cuts the core according to the cutting path.

Preferably, the brittleness index of the core is calculated according to the element content data in the second scanning image data by a brittleness index calculation module, and the tool selection is determined based on the brittleness index of the core, including:

Convert the element content into mineral content, and calculate the mass fraction of brittle minerals and the mass fraction of ductile minerals in the core;

The brittleness index of the core is obtained by the mass fraction of brittle minerals in the core and the mass fraction of ductile minerals in the core. The calculation process is as follows:

BI = [ _mbrittleness /( _mbrittleness + _mductility )] × 100%;

Among them, BI represents the brittleness index of the core, in percentage; _mbrittleness represents the mass fraction of brittle minerals in the core, in percentage; _mductility represents the mass fraction of ductile minerals in the core, in percentage;

The tool selection is determined based on the brittleness index of the core. When the brittleness index of the core is less than 0.37, a tool made of tourmaline is selected; when the brittleness index of the core is greater than or equal to 3.37 and less than 0.46, a tool made of tungsten steel is selected; when the brittleness index of the core is greater than or equal to 0.46 and less than 0.58, a tool made of diamond is selected; when the brittleness index of the core is greater than or equal to 0.58, a tool made of carbon nitride is selected.

The technical solution of the present invention has the following significant beneficial effects:

Due to the difference in physical properties between the weathered layer and the original rock layer on the surface of the field core, the weathered layer is relatively soft and has a low hardness relative to the original rock layer. Under a certain intensity of external force vibration, the physical structure of the weathered layer can be destroyed without destroying the original rock layer. At the same time, traditional stripping means are prone to damage to the original rock, the tool wear rate is serious, and the removal efficiency of traditional stripping means is low. Based on the characteristics of the above-mentioned original rock layer and the weathered layer, the present application can automatically identify the weathered layer through the data collected by the dual-mode scanning camera with image acquisition and element surface scanning through the main control system, and can select a tool with appropriate hardness to cut the weathered layer of the field core. Combined with the positioning of the core fixing system and the core by the laser positioning system, the cutting path coordinates on the core can be calculated and determined. The main control system can directly and automatically control the cutting work system, so that the tool moves and cuts according to the cutting path under the action of high-speed rotation, thereby realizing the efficient removal of the weathered layer in batches, and at the same time, the original rock layer will not be destroyed during the cutting process due to tool reasons.

With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

FIG1 is a schematic structural diagram of a device for automatically identifying and stripping a weathered layer of a field core according to an embodiment of the present invention;

FIG2 is a schematic structural diagram of a core fixing device according to an embodiment of the present invention;

3 is a schematic diagram of the structure of the laser positioning system and the core fixing device used in conjunction with each other in an embodiment of the present invention;

FIG4 is a schematic structural diagram of a cutting working system according to an embodiment of the present invention;

FIG5 is a schematic structural diagram of a partial cutting working system according to an embodiment of the present invention;

FIG6 is a perspective schematic diagram of a cutting mechanism in an embodiment of the present invention;

FIG7 is a schematic diagram of the principle of a cutting mechanism in an embodiment of the present invention;

8a and 8b are schematic diagrams of a color gamut recognition diagram and an element surface scanning result in scanned image data 1, respectively;

FIG. 9 is a schematic diagram of an exploded view of a dual-mode scanning camera in an embodiment of the present invention.

Reference numerals of the above drawings:

1. Core fixing system; 11. Cutting platform; 111. Sample box; 12. Core fixing device; 121. Sample fixer; 122. Fixing rod; 123. Adjustment knob; 124. Fixing plate; 125. Core; 2. Image acquisition system; 21. Dual-mode scanning camera; 211. Standard lens; 212. Focusing lens; 213. Protective cover; 214. XRF analysis unit; 215. Rotating part; 216. Outer cylinder; 217. Micro rotating connecting column; 218. Micro motor; 219. Ring main board; 22. Suspension bracket; 23. Top sliding belt; 24. Connecting buckle; 25. Column frame; 26. Rotating unit; 27. Horizontal moving movement; 3. Laser positioning system; 31. Laser space transmitter; 32. Photodiode; 33. Laser space transmitter group; 34. Wall bracket; 35. Suspension bracket; 4 , cutting working system; 41, first cylinder mechanism; 411, bottom cover; 412, first buffer valve; 413, cylinder barrel; 414, pull rod; 415, top cover; 416, second buffer valve; 417, piston; 418, dust cover; 419, flow control speed regulating valve; 42, telescopic rod mechanism; 43, base; 44, second cylinder mechanism; 45, telescopic column mechanism; 46, first motor mechanism; 47, second motor mechanism; 48, third motor mechanism; 49, first mechanical arm; 410, second mechanical arm mechanism; 430, cutting mechanism; 4301, micro telescopic rod mechanism; 4302, fourth motor mechanism; 4303, tool; 4304, sensor; 4304, tool cover; 431, ball; 432, platform; 5, main control system; 51, computer console; 52, mouse; 53, host.

Detailed ways

The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in the field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and/or" used herein includes any and all combinations of one or more of the related listed items.

Core data is usually difficult to obtain, and generally requires drilling through the target layer, especially in shale gas research, where sometimes pressure-maintained coring is required on site to study oil content. To achieve this, it is first necessary to drill a well and take the entire section of the core up at the same time, and the whole process is very expensive. For this reason, for geological researchers, in addition to underground well data, if they want to determine the oil and gas potential of this area, especially the unconventional oil and gas potential, without drilling a well, they need to adopt field sampling methods.

For example, the acquisition of drilling cores for the entire section of a shale gas reservoir investigation well requires a lot of manpower and material resources. When there is no drilling core, a small core column drilled in the field can be used as a substitute, as a very important means, but to ensure the effectiveness of field samples, complete and effective without wasting samples. The traditional removal of weathered layers is inefficient and has a high probability of causing damage to samples. In order to meet the requirements of batch testing and the requirements of efficient and automated batch removal of weathered layers, a field core weathered layer automatic identification and stripping device and method are proposed in this application, which is based on the combination of color gamut recognition and element surface scanning technology to automatically identify and strip the field core weathered layer. Figure 1 is a structural schematic diagram of a field core weathered layer automatic identification and stripping device in an embodiment of the present invention. As shown in Figure 1, the field core weathered layer automatic identification and stripping device in this application may include: an operating space system and a main control system 5, and the operating space system includes: an image acquisition system 2, a cutting work system 4, a core fixing system 1, and a laser positioning system 3.

FIG2 is a schematic diagram of the structure of the core fixing device in the embodiment of the present invention. As shown in FIG1 and FIG2, the core fixing system 1 is used to fix the core 125. In a feasible embodiment, the core fixing system 1 includes: a cutting platform 11 and a core fixing device 12. The cutting platform 11 is used to fix one or more core fixing devices 12. The cutting platform 11 may include a horizontally placed sample box 111, and the sample box 111 is in the shape of a rectangular parallelepiped. The sample box 111 may have four side walls and a bottom surface, and the top of the sample box 111 is an open opening. The core fixing device 12 is arranged at the bottom of the sample box 111. Multiple core fixing devices 12 can be arranged along the long side direction and the short side direction of the sample box 111, so as to facilitate the laser positioning system 3 to accurately locate and the cutting system 4 to cut. The sample box 111 can be made of a metallic glass material, and the metallic glass material can be made of a palladium microalloy, and its chemical structure can offset the inherent brittleness of glass while maintaining its strength. The metallic glass material has a lower density and is lighter than steel, and can significantly reduce the weight of the sample placement box 111 .

As shown in FIG2 , a core fixing device 12 may include a sample fixer 121; a fixing rod 122 screwed on the side wall in the opposite direction of the fixer, the fixing rod 122 having a thread; an adjusting knob 123 screwed on the fixing rod 122; at least four fixing rods 122 are respectively used to resist the four directions of the top, bottom, left and right of the core 125 to fix the core 125. The sample fixer 121 may also have four side walls and a bottom surface, and the top of the sample fixer 121 is an open opening. The four side walls of the sample fixer 121 are opposite to each other to form a rectangle. The sample fixer 121 can be fixed to the bottom of the sample box 111 by multiple Z-shaped fixing plates 124 and multiple screws. A fixing plate 124 is fixed to the bottom of the sample box 111 by one screw and fixed to the side wall of the sample fixer 121 by another screw. The four side walls of the sample holder 121 are provided with threaded holes, and the threaded fixing rods 122 are screwed into the threaded holes. By adjusting the threads, the fixing rods 122 in the threaded holes of the side walls in the opposite directions can be adjusted to extend into the sample holder 121, so as to press against the core 125 in the sample holder 121. Then, the adjusting knob 123 is tightened to make it close to the side wall of the sample holder 121 to lock the fixing rods 122. In the above manner, the four fixing rods 122 can press against the core 125 in four directions of up, down, left, and right, thereby fixing the core 125. The core 125 can be arranged as parallel to the side wall of the sample box 111 as possible, so as to facilitate cutting by the later cutting working system 4.

As shown in FIG. 1 , the laser positioning system 3 is used to position the core 125 and the core fixing system 1 to obtain coordinate value data of the core 125 and the coordinate value data of the core fixing system 1 , and send them to the main control system 5 . As a feasible method, the laser positioning system 3 may include: a laser space transmitter 31 and a photodiode 32 located above the core fixing system 1, the laser space transmitter 31 is used to transmit laser signals to the core fixing system 1, and the photodiode 32 is used to receive the laser signals reflected by the core fixing system 1; a laser space transmitter group 33 is arranged at the four corners of the sample box 111, the laser space transmitter group 33 is used in conjunction with the laser space transmitter 31 and the photodiode 32, and the photodiode 32 is also used to receive the laser signal emitted by the laser space transmitter group 33, so as to detect the position of the laser space transmitter group 33, the laser space transmitter group 33, the laser space transmitter 31 and the photodiode 32 are electrically connected to the main control system 5, so as to determine the position of the laser space transmitter group 33 at one of the corners of the sample box 111 as the origin of the coordinate system, and establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis.

As shown in FIG1 , the laser positioning system 3 is electrically connected to the main control system 5, so that it can receive commands from the main control system 5 and send the laser signal reflected by the core fixing system 1 to the main control system 5. The laser positioning system 3 is used to realize the positioning function, which can provide a feasible cutting space for the core 125, and can be specifically used to identify the core 125 and locate the position of the core 125. Otherwise, due to the lack of coordinate information of the core 125, it is easy to cut to other positions, such as cutting to the sample fixer 121.

In order to install the laser space transmitter 31 and the photodiode 32, the laser positioning system 3 may include a wall bracket 34 and a hanging bracket 35. The wall bracket 34 may be arranged above the core fixing system 1; the hanging bracket 35 is installed at the lower part of the wall bracket 34, and the laser space transmitter 31 and the photodiode 32 are fixedly arranged at the bottom of the hanging bracket 35. A component that can change the laser parameters is placed in the laser space transmitter 31. The component that changes the laser parameters may be a laser converter. The laser parameters may be changed by changing the power parameters of the laser. The component that changes the laser parameters is connected to the main control system 5 through a data line for transmitting data to realize data communication, and can be controlled by the main control system 5. Further, the photodiode 32 may preferably be a silicon photodiode. The silicon photodiode has a larger energy gap, so its signal noise is smaller than that of the germanium photodiode, and the coordinate value data of the core and the coordinate value data of the core fixing system finally obtained are more accurate. The silicon photodiode converts the reflected laser signal it receives and the laser signal emitted by the laser space transmitter group 33 into an electrical signal and sends it to the main control system 5.

As shown in FIG1 , the laser space transmitter group 33 may have four parts, and the four parts may be respectively arranged at the four corners of the sample box 111. Each part of the laser space transmitter group 33 is connected to the main control system 5, so that the position of the laser space transmitter group 33 at one corner of the sample box 111 is determined as the origin of the coordinate system, and a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis is established. The X-axis and the Y-axis may be the long side and the short side of the sample box 111, respectively.

FIG3 is a schematic diagram of the structure of the laser positioning system and the core fixing device used in conjunction with each other in an embodiment of the present invention. As shown in FIG1 and FIG3, the image acquisition system 2 may include a dual-mode scanning camera 21 capable of performing image acquisition and elemental surface scanning on the core 125. FIG9 is a schematic diagram of the decomposition of the dual-mode scanning camera in an embodiment of the present invention. As shown in FIG9, the dual-mode scanning camera 21 includes an outer cylinder 216, an XRF analysis unit 214, a rotating member 215, a focusing lens 212, a standard lens 211, an image acquisition unit, and a rotating drive mechanism for driving the rotating member 215 to rotate. Among them, the XRF analysis unit 214 is arranged in the outer cylinder 216, the focusing lens 212, the image acquisition unit and the standard lens 211 are installed on the rotating member 215, and the focusing lens 212 can be used in conjunction with the XRF analysis unit. The combination of the two is equivalent to forming a complete XRF analyzer, thereby performing elemental surface scanning on the core sample to obtain the element content. The standard lens 211 and the image acquisition unit are used in combination, and the combination of the two is equivalent to forming a complete camera. The standard lens 211 has excellent imaging quality and is extremely effective in capturing the details of the subject. The two cooperate to scan and shoot the core and obtain the core image. The rotation drive mechanism may include a micro-rotating connecting column 217 and a micro-motor 218 that drives the micro-rotating connecting column 217 to rotate. The micro-rotating connecting column 217 is fixedly connected to the rotating member 215 so that the rotating member 215 can rotate. The micro-motor 218 is indirectly or directly connected to the outer cylinder 216 to achieve fixation. The dual-mode scanning camera 21 has an annular mainboard 219, which is used to control the dual-mode scanning camera 21. The annular mainboard 219 can be electrically connected to the XRF analysis unit 214 and the image acquisition unit to receive data obtained by the XRF analysis unit 214 and the image acquisition unit. A wireless network card can be connected to the annular mainboard 219 to achieve data communication with the main control system 5. A protective cover 213 can also be provided on the outside of the outer cylinder 216.

The focusing lens 212 and the standard lens 211 are at the same distance from the rotation axis of the rotating member 215. Therefore, by controlling the rotation of the micromotor 218 and driving the rotation of the rotating member 215 through the micro rotating connecting column 217, the focusing lens 212 and the standard lens 211 can be respectively rotated to the same working position. The standard lens 211 and the image acquisition unit cooperate to acquire an image of the core to obtain scanning image data 1, which is used for color gamut identification of the weathering layer; the focusing lens 212 and the XRF analysis unit 214 cooperate to perform elemental surface scanning on the core to obtain scanning image data 2, which can obtain elemental composition distribution data of the core.

The image acquisition system 2 may also include a suspension bracket 22, a dual-mode scanning camera 21 mounted on the suspension bracket 22, and a top sliding belt 23, a coupling buckle 24, a column frame 25, and a rotating unit 26 for connecting the suspension bracket 22 and the dual-mode scanning camera 21. The dual-mode scanning camera 21 can capture the image of the core 125 on the core fixing system 1 in real time and transmit it to the main control system 5 for identification of the weathered layer and the original rock layer. The top sliding belt 23 is mounted on the suspension bracket 22 and can slide on the suspension bracket 22. The coupling buckle 24 is connected to the top sliding belt 23. The column frame 25 and the coupling buckle 24 are connected by a rotating unit 26, and the rotation between the column frame 25 and the coupling buckle 24 is realized by the rotating unit 26. The top sliding belt 23 can be connected to the horizontal moving movement 27 in transmission, so that the horizontal movement of the top sliding belt 23 is electrically controlled by the horizontal moving movement 27. A vertical rotating movement can be used in the rotating unit 26 to electrically control the rotation state of the dual-mode scanning camera 21. The dual-mode scanning camera 21 is connected to the lower end of the column frame 25. The horizontal position of the dual-mode scanning camera 21 can be adjusted by the suspension bracket 22 and the top sliding belt 23, so that the dual-mode scanning camera 21 is located directly above the rock core 125 that needs to be photographed and scanned as much as possible. The position of the dual-mode scanning camera 21 with different rotation degrees can be adjusted by the rotating unit 26. The vertical rotating movement and the horizontal moving movement 27 can be electrically connected to the main control system 5 to receive commands from the main control system 5 to electrically control the position and shooting direction angle of the dual-mode scanning camera 21. The dual-mode scanning camera 21 is electrically connected to the main control system 5 to receive commands from the main control system 5 and to send data to the main control system 5, for example, scanning image data 1 collected by the standard lens 211 and the image acquisition unit and scanning image data 2 collected by the focusing lens 212 and the XRF analysis unit 214.

The dual-mode scanning camera 21 has a standard lens 211 and a focusing lens 212 that can rotate, so that the standard lens 211 and the focusing lens 212 can both rotate to the same working position, so as to perform work shooting and scanning. The working process of the dual-mode scanning camera 21 may include: first use the lens located in the working position of the standard lens 211 and the focusing lens 212 to scan the core 125, then rotate the rotating part to rotate the other lens to the working position, and then use the other lens located in the working position to scan the core 125. The standard lens 211 is used to identify the weathering layer of the core 125, and the focusing lens is used to identify the element content of the weathering layer of the core 125 through the dual-mode scanning camera 21, and further obtain the brittleness of the weathering layer, so as to select a suitable tool 4303 for the cutting work system 4. The dual-mode scanning camera 21 is set to autofocus, for example, the camera focal length can be selected as 23mm, and the equivalent focal length can be selected as 34mm. In addition, the spatial resolution of the image collected by the dual-mode scanning camera 21 can reach 0.5mm.

The standard lens 211 and the focusing lens 212 of the dual-mode scanning camera 21 can be rotated and switched to the same working position, thereby ensuring that there is no angle deviation between the scanning image data 1 and the scanning image data 2 collected by the two lenses, so that the later cutting system 4 will not cause errors in cutting the core 125. Once the error is too large, it will cause damage to the original rock layer. The scanning image data 1 collected by the standard lens 211 and the image acquisition unit is the distribution of RGB parameters, and the scanning image data 2 collected by the focusing lens 212 and the XRF analysis unit 214 is the distribution of the element content parameters of the core.

As shown in Figure 1, the main control system 5 is used to obtain a cutting instruction including a cutting path and tool 4303 selection based on the coordinate value data of the core 125, the coordinate value data of the core fixing system 1, the scanning image data 1 and the scanning image data 2, and send the cutting instruction to the cutting working system 4. The cutting path is the boundary between the weathered layer and the original rock layer of the core 125.

As feasible, the main control system 5 may include a computer console 51, a mouse 52, a keyboard, a host 53, an input-output system, and the like. The computer console 51 is connected to the host 53 via a data line. After the host 53 and the computer console 51 are started, the host 53 will be connected to the input-output system, and the input-output system will be transmitted to the host 53 via the data line. The data line can use a high-speed data transmission line with a speed of up to 5G/s. When the computer is operated, data is read and written on the memory stick. The memory stick adopts the DDR5 mode. The CPU slot can use Lga1700, and the CPU can use i9-12900K. A better working speed can be achieved through the above configuration. The input-output system plays a bridging role, which can be connected to the image acquisition system 2, the cutting work system 4, and the laser positioning system 3.

The main control system 5 may include a color gamut recognition module and a brittleness index calculation module. FIG8a is a color gamut recognition diagram in the scanned image data 1. As shown in FIG8a, the color gamut recognition module is used to perform color identification on the scanned image data 1 to determine the boundary between the weathered layer and the original rock layer, and then calculate the cutting path of the tool 4303. The color gamut recognition module performs color identification on the color RGB value of the image in the scanned image data 1 transmitted back by the dual-mode camera. According to different color RGB value ranges, the boundary between the weathered layer and the original rock layer of the core can be determined, thereby issuing different instructions to control the moving position of the tool 4303 in the cutting work system 4, control the moving distance, and perform automatic adjustment. The color gamut recognition module has a very important identification function in this application. Therefore, the color identification module should at least use a high color gamut value, and the color gamut should be at least greater than 75% NTSC. The 75% NTSC value is equivalent to 100% sRGB. If there is only 100% sRGB, some weathered layers may not be accurately identified. The NTSC standard can at least improve the identification accuracy. The color gamut of the weathered layer of some cores 125 may exceed 100% sRGB (75% NTSC), so the color gamut recognition range is increased as much as possible, so that the cutting system 4 can clean the weathered layer more thoroughly. The color gamut recognition module can perform color identification on the scanned image data on the screen of the computer console 51, so in this application, the computer console 51 can use a 100% NTSC screen as much as possible.

FIG8b is a schematic diagram of the element surface scanning result in the scanning image data 1. As shown in FIG8b, the brittle index calculation module is used to calculate the brittle index of the core 125 according to the element content data in the scanning image data 2, and determine the selection of the tool 4303 based on the brittle index of the core 125. The brittle index calculation module calculates the scanning image data 2 collected by the brittle index lens, calculates the content of ductile minerals and brittle minerals from the mineral peak map in the scanning image data 2, thereby calculating the brittle index of the core 125, and thus determining the selection of the tool 4303 based on the brittle index of the core 125.

The brittleness index indicates the difficulty of rock fracture. The higher the brittleness index, the more brittle the physical properties of the rock, which makes it easy to fracture and form cracks. When the brittleness index is lower, it proves that fewer cracks are formed. Especially for engineering development, because it involves drilling, the difficulty of fracture of formations with different brittleness indexes is also different. The rock brittleness index has a great reference value in the study of oil and gas reserves.

The brittleness index indicates how fast or slow the rock breaks just before it breaks. The higher the brittleness index, the harder and brittle the underlying rock is. It is easy to break and form a complex network of cracks. The lower the brittleness index, the easier it is to form simple cracks. Due to the special properties of cracks in oil and gas reservoirs, the rock brittleness index has a very important reference value in the study of the distribution of oil and gas reservoirs in the underlying rock.

The main control system 5 may also include a laser space emission positioning module, which is used to control the laser positioning system 3 and process the returned data. Specifically, the laser space emission positioning module can generate a laser emission instruction, send the instruction to the laser positioning system 3, and obtain coordinate value data according to the electrical signal fed back by the laser positioning system 3. The coordinate value data includes two categories, one is the coordinate value data of the laser space emitter group 33, and the other is the coordinate value data of the core 125 and the coordinate value data of the core fixing system 1.

The main control system 5 may also include a domain position recognition module, which is used to establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis based on the laser signal received by the photodiode 32 to determine the position of one of the laser space transmitter groups 33 as the origin of the coordinate system, and to establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis with the core fixing system 1 as the plane. The domain position recognition module can obtain the coordinate value data of the boundary in the working three-dimensional plane coordinate system according to the boundary of the weathered layer and the original rock layer of the core 125 determined by the color domain recognition module. The main control system 5 may also include a cutting work system 4 control module, which is used to generate a cutting instruction including a cutting path according to the working three-dimensional plane coordinate system and the coordinate value data of the boundary in the working three-dimensional plane coordinate system, and send it to the cutting work system 4. The brittleness index calculation module calculates the brittleness index of the core 125, and after determining the selection of the tool 4303 based on the brittleness index of the core 125, it will also generate a cutting instruction including the selection of the tool 4303, and send the cutting instruction to the cutting work system 4.

The main control system 5 may also include a work area monitoring module, which may be used to generate a camera position adjustment instruction and send it to the image acquisition system 2, and receive the complete image of the core fixing system 1 fed back by the image acquisition system 2, and may also receive the coordinate value data of the core 125 and the coordinate value data of the core fixing system 1 acquired in real time by the laser positioning system 3, and the coordinate value data of the cutting movement of the tool 4303 in the cutting work system 4. When the cutting work system 4 cuts the core 125, it may monitor whether the cutting condition of the core 125 meets the requirements or whether there are other problems, whether the cutting movement of the tool 4303 meets the requirements or whether there are other problems, etc. If there is a problem, the cutting work system 4 may be immediately controlled again, such as stopped, so as to avoid accidents or cutting deviations, errors, etc.

As shown in FIG. 1 , the cutting system 4 may include a plurality of different cutters 4303 . The cutting system 4 is used to receive a cutting instruction from the main control system 5 , and select a suitable cutter 4303 to cut the core 125 according to the cutting path according to the cutting instruction.

As a feasible method, in order to control the movement of the tool 4303 in different coordinate positions, Figure 4 is a schematic diagram of the structure of the cutting working system in an embodiment of the present invention, and Figure 5 is a schematic diagram of the structure of a part of the cutting working system in an embodiment of the present invention. As shown in Figures 4 and 5, the cutting working system 4 may include: a first cylinder mechanism 41, a telescopic rod mechanism 42, a base 43, a second cylinder mechanism 44, a telescopic column mechanism 45, a first motor mechanism 46, a second motor mechanism 47, a third motor mechanism 48, a first robotic arm 49, a second robotic arm mechanism 410 and a cutting mechanism 430, etc.

As shown in Fig. 4 and Fig. 5, the two ends of the telescopic rod mechanism 42 are respectively connected to the first cylinder mechanism 41 and the base 43, and the first cylinder mechanism 41 drives the telescopic rod mechanism 42 to extend and retract to control the base 43 to move in the horizontal direction, specifically the direction perpendicular to the paper surface in the horizontal direction in Fig. 5. The first cylinder mechanism 41 is used to compress the gas and convert the pressure into mechanical energy, thereby driving the telescopic rod mechanism 42 to extend and retract.

In a feasible implementation, as shown in FIG4 , the first cylinder mechanism 41 includes a bottom end cover 411, a first buffer valve 412, a cylinder barrel 413, a tie rod 414, a top end cover 415, a second buffer valve 416, a piston 417, a dust cover 418 and a flow control speed regulating valve 419. The cylinder barrel 413 is arranged between the bottom end cover 411 and the top end cover 415, and two tie rods 414 are arranged on both sides of the cylinder barrel 413. The upper and lower ends of the two tie rods 414 are respectively fixedly connected to the bottom end cover 411 and the top end cover 415, thereby fixing the upper and lower structures of the cylinder assembly; the first buffer valve 412 and the second buffer valve 416 are respectively arranged on the bottom end cover 411 and the top end cover 415, so as to reduce the kinetic energy of the piston 417 hitting the end cover when it moves to the terminal, thereby reducing damage to the cylinder parts. A piston 417 is arranged on the top of the top end cover 415, and a dust cover 418 is arranged on the piston 417. The flow control speed regulating valve 419 is used to control the movement speed of the piston 417 .

As shown in FIG4 , the telescopic rod mechanism 42 can be a rod body inserted in another hollow rod body, and the two rod bodies can slide relative to each other to realize the telescopic rod mechanism 42, and the telescopic control is controlled by the pressure input to the hollow rod body by the first cylinder mechanism 41. A platform 432 can be set below the base 43 to facilitate the movement of the base 43, and a plurality of balls 431 can be set between the platform 432 and the base 43, so as to reduce the resistance of the base 43 moving on the platform 432. By controlling the base 43 to move significantly in the horizontal direction through the first cylinder mechanism 41, the position of the cutting mechanism 430 in the horizontal direction, that is, the position in the Y-axis direction in FIG1, can be changed to a large extent, and then the cores 125 in the core fixing device 12 at different positions on the cutting platform 11 can be cut, thereby improving the cutting efficiency of cutting multiple cores 125.

As shown in Fig. 4 and Fig. 5, the second cylinder mechanism 44 is arranged on the base 43 and connected to the telescopic column mechanism 45 to control the telescopic column mechanism 45 to extend and retract in the vertical direction. The second cylinder mechanism 44 is used to compress the gas and convert the pressure into mechanical energy, thereby driving the telescopic column mechanism 45 to extend and retract. The second cylinder mechanism 44 has a substantially same structure as the first cylinder mechanism 41, and will not be described in detail here, except that the size and power are different. The structure of the telescopic column mechanism 45 can be similar to that of the telescopic rod mechanism 42, except that it is larger in radial direction and the strength of the entire telescopic column mechanism 45 is higher, so as to be able to support other components such as the cutting mechanism 430 connected to the upper end of the telescopic column mechanism 45. The lower end of the telescopic column mechanism 45 can be provided with a thrust bearing for bearing axial loads.

As shown in FIG5 , the first motor mechanism 46 is arranged on the base 43, the telescopic column mechanism 45 is connected to the first motor in a transmission manner, and the first motor mechanism 46 drives the telescopic column mechanism 45 to rotate around the axis of the telescopic column mechanism 45. The telescopic column mechanism 45 is controlled to rotate in the above manner, thereby controlling the movement of the cutting mechanism 430 in the horizontal direction perpendicular to the paper surface, and also changing the angle of the cutter 4303. One end of the first mechanical arm 49 is connected to the upper end of the telescopic column mechanism 45 through the second motor mechanism 47, one end of the second mechanical arm mechanism 410 is connected to the other end of the first mechanical arm 49 through the third motor mechanism 48, and the cutting mechanism 430 is connected to the other end of the second mechanical arm mechanism 410; the position of the cutting mechanism 430 in the vertical and horizontal directions can be controlled by the rotation of the second motor mechanism 47 and the third motor mechanism 48, and the horizontal direction is the X direction in FIG1 . The combination of the first cylinder mechanism 41 , the second cylinder mechanism 44 , the first motor mechanism 46 , the second motor mechanism 47 and the third motor mechanism 48 can realize the movement of the cutting mechanism 430 in various directions and can adjust the angle of the tool 4303 .

49. The second manipulator mechanism 410 and the cutting mechanism 430 can form a manipulator assembly. The cutting system 4 can have a controller, for example, the controller can be set in the base 43, and the controller is electrically connected to the main control system 5 through a data line, which is used to decode the cutting instructions sent by the main control system 5, so as to control the manipulator assembly to perform corresponding actions to complete the cutting of the core 125 by the cutting mechanism 430. The first motor mechanism 46, the second motor mechanism 47, the third motor mechanism 48 and the second cylinder mechanism 44 are all electrically connected to the controller to achieve control. The controller can also be electrically connected to the first cylinder mechanism 41 to achieve control. Through the telescopic column mechanism 45, the large adjustment of the cutting mechanism 430 in the vertical direction can be controlled. Through the rotation of the first motor mechanism 46 and the second motor mechanism 47, the small adjustment of the cutting mechanism 430 in the vertical and horizontal directions can be controlled, and the vertical and horizontal directions are carried out simultaneously.

As shown in Fig. 5, the second mechanical arm mechanism 410 may include a plurality of mechanical arms, and the joints between the mechanical arms may be ball gears. The length and number of joints of the mechanical arms may be adjusted according to actual needs.

FIG6 is a three-dimensional schematic diagram of a cutting mechanism in an embodiment of the present invention, and FIG7 is a schematic diagram of the principle of a cutting mechanism in an embodiment of the present invention. As shown in FIG4, FIG6 and FIG7, the cutting mechanism 430 includes a knife cover 4304 and four cutting units arranged in the knife cover 4304. Each cutting unit includes: a micro-telescopic rod mechanism 4301, a fourth motor mechanism 4302, and a cutter 4303 connected to the lower end of the micro-telescopic rod mechanism 4301. The fourth motor mechanism 4302 can drive the micro-telescopic rod mechanism 4301 to move, so that the micro-telescopic rod mechanism 4301 is telescopic, and then the cutter 4303 is extended out of the knife cover 4304. The fourth motor mechanism 4302 can also drive the cutter 4303 to rotate. The cutter 4303 can be connected to the micro-telescopic rod mechanism 4301 by a fixing nut and a fixing bolt.

The cutters 4303 in the four cutting units are made of tungsten steel, diamond and carbon nitride materials, respectively. When the cutting work system 4 receives the cutting instruction from the main control system 5, it selects the appropriate cutter 4303 according to the cutting instruction, so that the fourth motor mechanism 4302 in one of the cutting units rotates to drive the micro telescopic rod mechanism 4301 to move, and the corresponding cutter 4303 will extend out of the cutter cover 4304, and then the fourth motor mechanism 4302 drives the cutter 4303 to rotate so as to cut the core 125. When the cutting is completed, the fourth motor mechanism 4302 in the cutting unit is controlled to rotate again, which can drive the micro telescopic rod mechanism 4301 to move and retract into the cutter cover 4304. During the process of the telescopic rod mechanism 42 retracting the cutter cover 4304, the cutter 4303 stops rotating.

The hardness of the tool 4303 can be divided into four types according to the Mohs hardness. The first type of tool 4303 has a hardness of 7.5 and is made of tourmaline; the second type of tool 4303 has a hardness of 9.0 and is made of tungsten steel; the third type of tool 4303 has a hardness of 10 and is made of diamond; the fourth type of tool 4303 has a hardness greater than 10 and is made of carbon nitride.

When the brittleness index of the core 125 is less than 0.37, the core 125 exhibits toughness characteristics, and the tool 4303 made of tourmaline is selected. When the brittleness index of the core 125 is greater than or equal to 3.37 and less than 0.46, the core 125 exhibits toughness and brittleness characteristics, and the tool 4303 made of tungsten steel is selected. When the brittleness index of the core 125 is greater than or equal to 0.46 and less than 0.58, the rock is relatively brittle, and the tool 4303 made of diamond is selected. When the brittleness index of the core 125 is greater than or equal to 0.58, the rock is extremely brittle, and the tool 4303 made of carbon nitride is selected.

A sensor 4304 may be installed at the center of the cutter 4303 in the four cutting units. The sensor 4304 is used to determine the spatial position and cutting direction of the cutter 4303 when cutting the weathered layer of the core 125, and transmit it to the main control system 5. The controller is electrically connected to the four fourth motor mechanisms 4302 to achieve control.

When the controller of the cutting system 4 receives the cutting instruction, the controller controls the first cylinder mechanism 41 to operate, thereby greatly changing the horizontal position of the cutting mechanism 430, so that the cutting mechanism 430 is generally located above the core fixing device 12 to be cut on the cutting platform 11. Afterwards, the controller selects a suitable tool 4303 according to the cutting instruction, so that the fourth motor mechanism 4302 in one of the cutting units rotates to drive the micro telescopic rod mechanism 4301 to move, and the corresponding tool 4303 will extend out of the tool cover 4304, and then the fourth motor mechanism 4302 drives the tool 4303 to rotate. The controller controls the second cylinder mechanism 44, the first motor mechanism 46, the second motor mechanism 47, and the third motor mechanism 48 to control the moving path of the tool 4303, cuts the core 125 according to the cutting path, and accurately removes the weathered layer of the core 125.

The present application also proposes a method for automatically identifying and stripping the weathered layer of a field core based on the above-mentioned device for automatically identifying and stripping the weathered layer of a field core. The method may include the following steps:

The core 125 is installed in the core fixing system 1 for fixing, and the cutters 4303 with different hardness are installed on the cutting working system 4 .

In this step, the core 125 is installed in the core fixing device 12. Specifically, the core 125 is placed in the sample fixer 121, and the adjusting knob 123 and the fixing rod 122 are adjusted so that the sample fixer 121 can better fix the core 125 to be processed. Prepare for the subsequent steps. If the core 125 is not fixed well, the image acquisition system 2 may not achieve the expected effect. That is, first loosen the adjusting knob 123 of the sample fixer 121, adjust the length of the fixing rod 122 extending into the sample fixer 121 so that the sample is just stuck, and then tighten the adjusting knob 123. The outer wall of the four fixing rods 122 on the fixer has threads, and the circular bottom surface of the end can be coated with a friction layer, which can make the fixing of the core 125 more stable.

Install the cutters 4303 of different hardness on the cutting system 4 and make sure that the cutters 4303 are fixed. This step is performed before power is turned on. After confirming that the cutters 4303 are fixed and stable, power is turned on to prevent accidents caused by the cutters 4303. After the above operations are completed, the power supply of the entire main control system 5 and the power supply of the working space system can be turned on.

After the core 125 is installed and fixed, the laser positioning system 3 is used to position the core 125 and the core fixing system 1 to obtain coordinate value data of the core 125 and the coordinate value data of the core fixing system 1 , and send them to the main control system 5 .

In the above steps, the main control system 5 determines the position of one of the laser space transmitter groups 33 as the origin of the coordinate system, takes the core fixing system 1 as the plane, and establishes a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis. The main control system 5 can send a command of the required position change of the dual-mode scanning camera 21 to the image acquisition system 2 according to the coordinate value data of the core 125, so that the dual-mode scanning camera 21 can be moved to the top of the cutting working system 4, specifically directly above the core 125. It is necessary to make the horizontal plane images of the core fixing system 1 and the cutting working system 4 acquired by the dual-mode scanning camera 21 consistent with the established working three-dimensional plane coordinate system to form a matching image.

After the core 125 is installed and fixed, the image acquisition system 2 performs image acquisition and element surface scanning on the core 125, and the scanning image data 1 acquired by the standard lens 211 and the image acquisition unit and the scanning image data 2 acquired by the focusing lens 212 and the XRF analysis unit are sent to the main control system 5. Specifically, during the scanning process, the core 125 is first scanned using the lens located at the working position of the standard lens 211 and the focusing lens 212, and then the lens is rotated to rotate the other lens to the working position, and then the core 125 is scanned using the other lens located at the working position.

In the above steps, the scanning image data 1 collected by the standard lens 211 and the image acquisition unit can be analyzed by image analysis, and the position and size of the weathering area of the core 125 can be determined based on the color value of the image; the degree of concave and convex of the weathering layer surface can be determined based on the brightness difference of the weathering area. The scanning image data 2 collected by the focusing lens 212 and the XRF analysis unit contains the element content distribution of the scanned core 125.

The main control system 5 performs color identification on the scanned image data 1 through the color gamut recognition module to determine the boundary between the weathered layer and the original rock layer, and then calculates the cutting path of the tool 4303 according to the coordinate value data of the core 125 and the coordinate value data of the core fixing system 1. The brittleness index of the core 125 is calculated according to the element content data in the scanned image data 2 through the brittleness index calculation module, and the tool 4303 selection is determined based on the brittleness index of the core 125. After that, the main control system 5 sends the cutting instruction including the cutting path and the tool 4303 selection to the cutting work system 4.

In the main control system 5, the color gamut recognition module is used to identify the color of the scanned image data 1 to determine the boundary between the weathered layer and the original rock layer. The existing computer automation determines the boundary between the weathered layer and the original rock layer mainly through Matlab software: the image is converted into a double-precision floating point number with the help of the im2double function. The double-precision floating point number (double) belongs to a data type, and a floating point number is stored using 64 bits (8 bytes). It can represent 15 or 16 decimal digits, and the range of the number is approximately: -1.79E+30~+1.79E+30. Then the scan result is converted into a grayscale image with the help of the rab2gray function. Grayscale is to divide white and black into multiple levels in a logarithmic relationship, and grayscale can be divided into 256 levels. Then the ddencmp function is used to perform wavelet denoising on the layer, and then the global threshold denoising is performed with the help of the wdencmp function; the functions that can obtain thresholds in Matlab include ddencmp, wwdcbm, etc. Finally, the edge function canny operator is used to start edge-based segmentation edge recognition cutting. The image is distinguished, identified, selected, separated, and separated pixel by pixel by pixel by setting the color threshold range in advance, such as using the RGB value of the core color as the threshold. Finally, the identified result is sent to the cutting work system 4.

The coordinates of the cutting path of the boundary between the weathered layer and the original rock layer in the working three-dimensional plane coordinate system can be formed as follows: turn on the laser space transmitter 31 and the laser space transmitter group 33 of the laser positioning system 3, use the laser space transmitter group 33 and the laser space transmitter 31 and the photodiode 32 together, determine the position of the laser space transmitter group 33 at one corner of the sample box 111 as the origin of the coordinate system, and establish a working three-dimensional plane coordinate system perpendicular to the X axis and the Y axis. The density of the coordinates of the point set of the boundary between the weathered layer and the original rock layer on the core 125 varies with the complexity of the boundary of the core 125. The shapes of the weathered layers of different cores 125 are different. The more complex the boundary, the denser the point set. The coordinates of the point set of the boundary between the weathered layer and the original rock layer on the core 125 can be fitted into a smooth curve through the auxiliary observation of the image acquisition system 2, and then continuously fine-tuned and corrected to make the fitted curve coincide with the boundary line of the conjugate lamina on the surface of the core 125; the cutting path for the tool 4303 to remove the weathered layer is generated according to the corrected curve, and sent to the cutting work system 4. Then the controller of the cutting work system 4 will parse the cutting path of the received cutting instruction, control the manipulator component and the like to execute the corresponding cutting path according to the instruction, so that the tool 4303 can peel off the weathered layer of the core 125 according to the specified cutting path.

The adjusted and corrected curve can use accurate polynomials, based on the principles of Taylor expansion and least squares method to obtain the required polynomial function. The longer the polynomial, the more accurate it is, so an infinitely close function can be obtained, so that the curve can be fitted. Finally, the function obtained after the polynomial expansion has reached the accuracy level, and the error between the corresponding curve and the adjusted and corrected curve will be very small, which can be ignored at this time. The established three-dimensional working three-dimensional plane coordinate system and the polynomial function obtained by the above fitting are transmitted to the control module of the cutting working system 4, the initial coordinates, that is, the origin of the coordinates, and the coordinate values of the cutting start and end points are input, and the cutting path of the tool 4303 is formed according to the polynomial function.

The brittleness index of the entire core 125 is calculated based on the element content data in the second scanning image data by the brittleness index calculation module. This is because the cutting trajectory is the boundary between the weathering layer and the original rock layer. The core brittleness index is mainly controlled by the brittle mineral composition and content of the rock. The brittleness index calculation is for the brittle minerals of the original rock of the core. In determining the selection of the tool 4303 based on the brittleness index of the core 125, it can specifically include:

The element content is converted into mineral content, and the mass fraction of brittle minerals in the core and the mass fraction of ductile minerals in the core are calculated. For example, the steps of converting element content into mineral content can be as follows: Comparing the data results of element content and mineral content, it can be found that for clay mineral content, it is generally highly correlated with the content of Th, K, and Al elements, mainly because the valence of Th in nature is very single, and only +4 valence exists. Therefore, it is relatively stable, and at the same time, it performs poorly in solubility, and clay minerals easily adsorb it. After adsorption, the migration ability will weaken, so it will achieve stable existence in clay minerals; further, for potassium salts, it is easy to dissolve, so it will remain in the state of solution in formation water. There are two main sources of potassium, one is clay, and the other is other potassium-containing minerals. At the same time, shale is mainly clay (especially in terrestrial strata), which has a good correlation with K. Due to the good correlation between Th, K, Al and clay minerals, minerals such as montmorillonite, kaolinite illite and chlorite are modeled based on these three elements. At the same time, Matlab software is used to fit the polynomial and pick out the best result. The fitting result is as follows:

Illite: M illite = -12.7 + 0.1 × Th - 2.6 × K + 3.3 × Al

Montmorillonite: M Montmorillonite = -1.0-0.2×Th+0.6×Al

Kaolinite: Mkaolinite = -2.1 + 0.1 × Th-3 × K + 1.3 × Al

Chlorite: M chlorite = 4.2 + 0.3 × Th + 0.3 × K + 0.8 × Al

M illite is the mineral content of illite, M montmorillonite is the mineral content of montmorillonite, M kaolinite is the mineral content of illite, and M chlorite is the mineral content of chlorite. After the clay mineral content is calculated, the elements contained in the clay mineral are removed to obtain the content of the remaining mineral elements. Further, according to the standard element composition of different minerals, the content of other minerals in the model is calculated. Th is the mass content of thorium, K is the mass content of potassium, and Al is the mass content of aluminum, in percentage.

The calculation formula of content is as follows:

[Y] = [C] · [X]; in the above formula, [Y] represents the column matrix of the actually measured element content, in percentage; [C] represents the column matrix of the element abundance in different minerals; [X] represents the column matrix of the mineral content to be solved, in percentage, and [C] represents the coefficient, which is dimensionless.

In this application, considering that the core is drilled and sampled, it is a columnar core drilled by a portable drill in the field, so the mineral composition method is considered to calculate the brittleness index. The brittleness index of the core is obtained by the mass fraction of brittle minerals in the core and the mass fraction of ductile minerals in the core. The calculation process is as follows:

BI = [ _mbrittleness /( _mbrittleness + _mductility )] × 100%;

Among them, BI represents the brittleness index of the core, in percentage; _mbrittleness represents the mass fraction of brittle minerals in the core, in percentage; _mductility represents the mass fraction of ductile minerals in the core, in percentage;.

The brittleness index is different for the weathered layer of the core 125. Specifically in the present application, after scanning by the focusing lens 212 and the XRF analysis unit 214 in the image acquisition system 2, the binary colorization can characterize the particle size, and the color rasterization will make the photo appear granular, that is, the particle size is identified, and the brittle mineral content of quartz, feldspar, carbonate, etc. can be automatically calculated by the software.

For example, when the drilled core is mud shale, it belongs to the fine-grained sedimentary rock deposition system, especially the pure mud shale of the river-lake phase in arid environment. For the terrestrial fine-grained sedimentary system, the brittleness of the mud shale formed under different sedimentary environments is different, and the brittleness characteristics are significantly different. Therefore, it is necessary to carry out targeted removal according to the shale samples with different brittleness indexes. Through the triaxial stress experiment, the rock stress-strain curve can be determined, and then the elastic modulus, peak strength, Poisson's ratio, peak strain, residual strength, recoverable strain, recoverable strain energy, residual strain, total energy and other parameters can be determined. The brittleness index is calculated by the above parameters, and the result is selected as the true brittleness index through calculation. Then as the basis for classification, according to the state of rock fracture, the stress-strain peak pre-peak and post-peak curve is analyzed again, and the brittleness index is divided into multiple levels by characteristics.

The principle of the element surface scanning technology used by the focusing lens 212 is as follows: when calculating the brittleness index, it is necessary to know the mineral content, which is obtained by using the element surface scanning technology. When a beam of X-rays is incident on the crystal, different atoms will scatter the X-rays. In addition, these rays will interfere with each other. The diffraction results produced by different crystals are different, which reflects the internal atomic distribution law. The diffraction peak parameters of the crystal are different. The number, position and intensity will produce different results depending on the different substances. Therefore, there are no two diffraction spectra that are exactly the same, so different substances can be identified for phase analysis. The element surface scanning technology can collect the content of various minerals in the weathering layer of the core in this application, and can obtain standard spectra of various minerals, including nearly dozens of mineral components such as quartz, feldspar, calcite, dolomite, pyrite, and mineral content. The brittleness index can be calculated by the brittle mineral content and the ductile mineral content.

The selection of the tool 4303 is determined based on the brittleness index of the core 125, wherein when the brittleness index of the core 125 is less than 0.37, the tool 4303 made of tourmaline is selected; when the brittleness index of the core 125 is greater than or equal to 3.37 and less than 0.46, the tool 4303 made of tungsten steel is selected; when the brittleness index of the core 125 is greater than or equal to 0.46 and less than 0.58, the tool 4303 made of diamond is selected; when the brittleness index of the core 125 is greater than or equal to 0.58, the tool 4303 made of carbon nitride is selected.

The cutting working system 4 receives the cutting instruction from the main control system 5, selects a suitable tool 4303 according to the cutting instruction, and cuts the core 125 according to the cutting path.

In the above steps, after the cutting working system 4 receives the cutting instruction from the main control system 5, the cutting working system 4 determines the appropriate tool 4303, and the controller controls the tool 4303 to extend and rotate. After that, the controller controls the manipulator assembly to cut the core sample according to the cutting path, and at the same time monitors the position and cutting direction of the tool 4303 at the same time, and sends the monitoring data to the main control system 5 through the sensor 4304.

Specifically, the cutting instruction data stream is imported into the controller in the cutting working system 4, and then the controller will parse the received data stream, select the corresponding tool 4303 according to the instruction, the fourth motor mechanism 4302 corresponding to the tool 4303 works, the tool 4303 extends and rotates at high speed, and the tool 4303 cuts the core 125 according to the cutting path, thereby separating the weathered layer of the core 125. In the above process, the brittleness index calculated in the previous step selects the tool 4303 of appropriate hardness, the cutting working system 4 receives the instruction of the main control system 5, controls the fourth motor mechanism 4302 corresponding to the tool 4303 on the tool 4303 of corresponding hardness to work, the corresponding micro telescopic rod is extended, the tool 4303 moves to the specified position, and adjusts the angle of the first mechanical arm 49, the height of the telescopic column mechanism 45, etc., so that the tool 4303 slowly approaches the weathered layer of the core 125.

Afterwards, the cutting system 4 controls the cutting trajectory of the tool 4303, and the controller controls the manipulator assembly to perform corresponding actions according to the cutting instruction, and can make the tool 4303 operate and cut and move according to the cutting trajectory in the cutting instruction. During the cutting process, the real-time cutting status is monitored through the work domain monitoring module, and the status of the tool 4303, such as the cutting position and orientation, is monitored to ensure that the weathered layer of the core 125 is indeed cut to achieve the purpose of removing the weathered layer.

After the cutting of one core 125 is completed, the first cylinder mechanism 41 is controlled to operate to drive the telescopic rod mechanism 42 to extend and retract, thereby allowing the cutter 4303 to move horizontally in a large range, so that the cutter 4303 can be moved to the core fixing device 12 at different positions, and the cutting work of the first core 125 can be repeated, so that batches of cores 125 can be processed.

Specifically, after a core 125 is cut, the main control system 5 issues a command, that is, sends the generated command to the controller of the cutting work system 4, and then the controller parses the received command data, controls the operation of the first cylinder mechanism 41, controls the telescopic rod mechanism 42 to extend and retract, and then controls the horizontal movement of the manipulator assembly, and finally moves the tool 4303 horizontally. In this way, the tool 4303 can be moved to the position of different sample fixers 121, and then batch processing can be performed. After all the cores 125 are cut, the power supply of the field core weathering layer automatic identification and stripping device is cut off, and the core 125 with the weathering layer cut is taken out. These core 125 samples with the weathering layer cut can be used for various subsequent geological studies.

The field core weathering layer automatic identification and stripping device and method in the present application have the following beneficial effects:

1. Due to the difference in physical properties between the weathered layer and the original rock layer on the surface of the field core, the weathered layer is relatively soft and has a low hardness relative to the original rock layer. Under a certain intensity of external force vibration, the physical structure of the weathered layer can be destroyed without destroying the original rock layer. At the same time, traditional stripping means are prone to damage to the original rock, the tool wear rate is serious, and the removal efficiency of traditional stripping means is low. Based on the above-mentioned characteristics of the original rock layer and the weathered layer, the present application can automatically identify the weathered layer through the data collected by the dual-mode scanning camera with image acquisition and element surface scanning through the main control system, and can select a tool with appropriate hardness to cut the weathered layer of the field core. Combined with the positioning of the core fixing system and the core by the laser positioning system, the cutting path coordinates on the core can be calculated and determined. The main control system can directly and automatically control the cutting work system, so that the tool moves and cuts according to the cutting path under the action of high-speed rotation, thereby realizing the batch and efficient removal of the weathered layer, and at the same time, the original rock layer will not be damaged during the cutting process due to tool reasons.

2. A color gamut recognition module is provided in the main control system, which can identify the weathering layer by the color gamut value to improve the recognition accuracy and overcome the inaccuracy of manual recognition; at the same time, a high color gamut recognition system, i.e. 100% NTSC, can be used, which can more accurately identify the weathering layer.

3. The cutting system in this application is composed of four cutters with different hardness. In particular, cutters with different hardness are required for cutting weathered layers of different brittleness to improve the removal efficiency of the weathered layers. At the same time, it also reduces the wear rate of the cutters and can avoid or reduce damage to the original rock layer.

4. In this application, a focusing lens and an XRF analysis unit are used to scan the core based on the element surface scanning technology, and the scanned image data is sent to the main control system. The main control system can use the brittleness index calculation module to obtain the content of different elements in the core, and then calculate the brittleness index. According to different brittleness indexes, the hardness of the weathering layer can be reflected, so that different tools can be selected for cutting.

5. Multiple core fixing devices can be installed on the cutting table in the present application, so multiple core samples can be placed at one time, and batch sampling and cutting can be carried out, thereby greatly improving work efficiency.

6. The dual-mode scanning camera in the image acquisition system of the present application includes two lenses that can be rotated to the same working position, one lens is a standard lens to identify the weathered layer, and the other lens is a focusing lens to identify the hardness of the weathered layer. Different lenses can be rotated and switched to the same working position, so that there is no angle deviation between the scanning image data 1 and the scanning image data 2 collected under the two lenses. The tool selection and cutting path obtained by the later main control system analysis are highly adapted to avoid damage to the original rock layer caused by the later cutting work system when cutting the core.

All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The combination of elements, ingredients, parts or steps described here using the terms "comprising" or "including" also contemplates an embodiment consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims (8)

1. A field core weathering layer automatic identification and stripping device, characterized in that the field core weathering layer automatic identification and stripping device comprises: a working space system and a main control system; the working space system comprises an image acquisition system, a cutting work system, a core fixing system and a laser positioning system; wherein, The core fixing system is used to fix the core; The laser positioning system is used to locate the core and the core fixing system to obtain coordinate value data of the core and the core fixing system, and send the coordinate value data to the main control system; The image acquisition system includes a dual-mode scanning camera capable of performing image acquisition and elemental surface scanning on the core, the dual-mode scanning camera includes: an outer cylinder, an XRF analysis unit, a rotating member, a focusing lens, a standard lens, an image acquisition unit and a rotating drive mechanism for driving the rotating member to rotate, the XRF analysis unit is arranged in the outer cylinder, the focusing lens, the image acquisition unit and the standard lens are installed on the rotating member, the focusing lens can be used in conjunction with the XRF analysis unit to perform elemental distribution scanning on the core, the standard lens and the image acquisition unit are used in conjunction with each other to perform image acquisition on the core, the focusing lens, the standard lens and the rotating member are at the same distance from the rotating axis, the rotating drive mechanism can drive the rotating member to rotate so that the focusing lens and the standard lens can be respectively rotated to the same working position; the image acquisition system is used to send scanning image data 1 collected from the core by the standard lens and the image acquisition unit and scanning image data 2 collected by the focusing lens and the XRF analysis unit to the main control system; The main control system is used to obtain a cutting instruction including a cutting path and tool selection according to the coordinate value data of the core, the coordinate value data of the core fixing system, the scanning image data 1 and the scanning image data 2, and send the cutting instruction to the cutting work system, wherein the cutting path is the boundary between the weathered layer and the original rock layer of the core; The cutting working system includes a plurality of different cutting tools, and the cutting working system is used to receive the cutting instruction of the main control system, and select a suitable cutting tool according to the cutting instruction to cut the core according to the cutting path; Wherein, the main control system includes a color gamut recognition module and a brittleness index calculation module; The color gamut recognition module is used to perform color identification on the scanned image data 1 to determine the boundary between the weathered layer and the original rock layer, and then calculate the cutting path of the tool; The brittleness index calculation module is used to calculate the brittleness index of the core according to the element content data in the second scanning image data, and determine the tool selection based on the brittleness index of the core; The laser positioning system includes: a laser space transmitter and a photodiode located above the core fixing system, the laser space transmitter is used to transmit laser signals to the core fixing system, and the photodiode is used to receive the laser signals reflected by the core fixing system; a laser space transmitter group is arranged at the four corners of the sample box, the laser space transmitter group is used in conjunction with the laser space transmitter and the photodiode, and the photodiode is also used to receive the laser signal emitted by the laser space transmitter group, the laser space transmitter group, the laser space transmitter and the photodiode are electrically connected to the main control system to determine the position of the laser space transmitter group at one of the corners of the sample box as the origin of the coordinate system, and establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis. 2. The field core weathering layer automatic identification and stripping device according to claim 1, characterized in that the core fixing system comprises: a cutting platform and a core fixing device; The cutting platform comprises a horizontally placed sample box, and the sample box is in the shape of a cuboid; The core fixing device is arranged at the bottom of the sample box, and the core fixing device includes a sample fixer; a fixing rod screwed on the side wall in the opposite direction of the fixer, and the fixing rod has a thread; an adjusting knob screwed on the fixing rod; there are at least four fixing rods, which are respectively used to resist the four directions of the top, bottom, left and right of the core to fix the core. 3. The automatic identification and stripping device for weathered layers of field cores according to claim 1 is characterized in that the working process of the dual-mode scanning camera includes: firstly scanning the core using the lens located in the working position of the standard lens and the focusing lens, then rotating the rotating part to rotate the other lens to the working position, and then scanning the core using the other lens located in the working position. 4. The field core weathering layer automatic identification and stripping device according to claim 1 is characterized in that the cutting working system comprises: a first cylinder mechanism, a telescopic rod mechanism, a base, a second cylinder mechanism, a telescopic column mechanism, a first motor mechanism, a second motor mechanism, a third motor mechanism, a first mechanical arm, a second mechanical arm mechanism and a cutting mechanism; the two ends of the telescopic rod mechanism are respectively connected to the first cylinder mechanism and the base, the first cylinder mechanism drives the telescopic rod mechanism to telescope to control the base to move in the horizontal direction; the second cylinder mechanism is arranged on the base and connected to the telescopic column mechanism to control the telescopic column mechanism to telescope in the vertical direction, the first motor mechanism is arranged on the base, the telescopic column mechanism is transmission-connected with the first motor mechanism, the first motor mechanism drives the telescopic column mechanism to rotate around the axis of the telescopic column mechanism, one end of the first mechanical arm is connected to the upper end of the telescopic column mechanism through the second motor mechanism, one end of the second mechanical arm mechanism is connected to the other end of the first mechanical arm through the third motor mechanism, and the cutting mechanism is connected to the other end of the second mechanical arm mechanism; the position of the cutting mechanism in the vertical and horizontal directions is controlled by the rotation of the first motor mechanism and the second motor mechanism. 5. The field core weathering layer automatic identification and stripping device according to claim 4 is characterized in that the cutting mechanism includes a knife cover and four cutting units arranged in the knife cover, each of the cutting units includes: a micro-telescopic rod mechanism, a fourth motor mechanism, and a tool connected to the lower end of the micro-telescopic rod mechanism, the fourth motor mechanism can drive the micro-telescopic rod mechanism to rotate so that the micro-telescopic rod mechanism can be extended and retracted, thereby making the tool extend out of the knife cover, and the fourth motor mechanism can also drive the tool to rotate; the tools in the four cutting units are made of tourmaline, tungsten steel, diamond and carbon nitride materials respectively. 6. The automatic identification and stripping device for weathered layers of field cores according to claim 1 is characterized in that the main control system includes a domain position identification module, which is used to establish a working three-dimensional plane coordinate system perpendicular to the X-axis and the Y-axis based on the laser signal received by the photodiode to determine the position of one of the laser space transmitter groups as the origin of the coordinate system, and to use the core fixing system as a plane. 7. A method for automatically identifying and stripping weathered layers of a field core using the device for automatically identifying and stripping weathered layers of a field core as claimed in any one of claims 1 to 6, characterized in that the method for automatically identifying and stripping weathered layers of a field core comprises: Install the core into the core fixing system for fixation, and install cutters of different hardness on the cutting working system; After the core is installed and fixed, the core and the core fixing system are positioned by a laser positioning system to obtain coordinate value data of the core and the coordinate value data of the core fixing system, and send them to the main control system; After the core is installed and fixed, the image acquisition system is used to acquire images and scan the element surface of the core, and the scanning image data 1 acquired by the standard lens and the image acquisition unit and the scanning image data 2 acquired by the focusing lens and the XRF analysis unit are sent to the main control system. During the scanning process, the core is first scanned by the lens located in the working position of the standard lens and the focusing lens, and then the rotating part is rotated to rotate the other lens to the working position, and then the core is scanned by the other lens located in the working position; The main control system performs color identification on the scanned image data 1 through the color gamut recognition module to determine the boundary between the weathered layer and the original rock layer, and then calculates the cutting path of the tool according to the coordinate value data of the core and the coordinate value data of the core fixing system, calculates the brittleness index of the core according to the element content data in the scanned image data 2 through the brittleness index calculation module, and determines the tool selection based on the brittleness index of the core, and then the main control system sends the cutting instruction including the cutting path and tool selection to the cutting work system; The cutting working system receives the cutting instruction from the main control system, selects a suitable tool according to the cutting instruction, and cuts the core according to the cutting path. 8. The method for automatically identifying and stripping the weathered layer of a field core according to claim 7 is characterized in that the brittleness index of the core is calculated according to the element content data in the second scanning image data by a brittleness index calculation module, and the tool selection is determined based on the brittleness index of the core, including: Convert the element content into mineral content, and calculate the mass fraction of brittle minerals and the mass fraction of ductile minerals in the core; The brittleness index of the core is obtained by the mass fraction of brittle minerals in the core and the mass fraction of ductile minerals in the core. The calculation process is as follows: BI = [ _mbrittleness /( _mbrittleness + _mductility )] × 100%; Among them, BI represents the brittleness index of the core, in percentage; _mbrittleness represents the mass fraction of brittle minerals in the core, in percentage; _mductility represents the mass fraction of ductile minerals in the core, in percentage; The tool selection is determined based on the brittleness index of the core. When the brittleness index of the core is less than 0.37, a tool made of tourmaline is selected; when the brittleness index of the core is greater than or equal to 3.37 and less than 0.46, a tool made of tungsten steel is selected; when the brittleness index of the core is greater than or equal to 0.46 and less than 0.58, a tool made of diamond is selected; when the brittleness index of the core is greater than or equal to 0.58, a tool made of carbon nitride is selected.