CN107916928A - With brill fluid analyser - Google Patents

Abstract

The invention discloses a fluid analyzer while drilling, wherein, the fluid analyzer while drilling comprises: a short joint connected with a drill pipe, the short joint is provided with an accommodating cavity capable of accommodating an analysis unit; the analysis unit It includes a suction module for pumping fluid in the formation and an analysis probe capable of detecting the characteristic parameters of the fluid, the analysis probe is connected to the suction module, and the suction module is in contact with the well wall; the suction The module is electrically connected with the control system; a drainage tube capable of delivering drilling fluid to the drill bit is provided in the drill pipe, and the drainage tube is arranged on one side of the analysis probe. The Fluid Analyzer While Drilling of the present invention has a simple mechanism and a simple assembly process, which brings great convenience to use. The Fluid Analyzer While Drilling can be used to quantitatively evaluate key information such as the composition and viscosity of formation fluids during the drilling process, thereby Provide key information for oil and gas exploration and development.

Description

Fluid Analyzer While Drilling

technical field

The invention relates to the logging-while-drilling field of drilling engineering technology for petroleum exploration and development, in particular to a fluid analyzer while drilling capable of analyzing characteristic parameters of formation fluids.

Background technique

The physical properties of reservoir fluids can be used to determine the reserves of the reservoir, and can help predict the productivity and economics of the reservoir. The degree of understanding of reservoir fluid properties is an important factor in the development of oil and gas reservoirs.

Downhole nuclear magnetic resonance fluid analysis technology uses the interaction between the magnetism of the atomic nucleus and the external magnetic field and its response signal characteristics to obtain geophysical parameters such as fluid composition and content, fluid viscosity, gas-oil ratio, etc. The invasion range and pollution degree of liquid filtrate provide key information for oil and gas exploration and development.

Therefore, it is necessary to provide a fluid analyzer while drilling that can analyze the characteristic parameters of formation fluid.

Contents of the invention

The fluid analyzer while drilling of the present invention is simple in structure, easy to assemble, and is convenient to be embedded in the outer wall of the drill pipe; the fluid analyzer while drilling can quantitatively evaluate key information such as the composition and viscosity of the formation fluid during the drilling process, so as to provide information for oil and gas. Exploration and development provide key information, while the fluid analyzer while drilling of the present invention can move up and down in the well while drilling, can measure the characteristic parameters of the fluid in the formation of different depths, improve measurement and accuracy, the fluid analyzer while drilling of the present invention can also It has the advantage of quickly measuring the characteristic parameters of the formation fluid, that is, to achieve the purpose of timely measurement.

In order to achieve the above object, the present invention provides a fluid analyzer while drilling, wherein the fluid analyzer while drilling includes: a short joint connected with a drill pipe, and the short joint is provided with an accommodating cavity capable of accommodating an analysis unit ;

The analysis unit includes a suction module for pumping fluid in the formation and an analysis probe capable of detecting characteristic parameters of the fluid, the analysis probe is connected to the suction module, and the suction module is in contact with the well wall;

The suction module is electrically connected to the control system;

A drainage tube capable of delivering drilling fluid to the drill bit is arranged inside the drill rod, and the drainage tube is arranged on one side of the analysis probe.

The above-mentioned fluid analyzer while drilling, wherein, the suction module includes a suction probe, a movable metal probe is arranged inside the suction probe, and an annular A skin bag, the side of the suction probe away from the annular skin bag is provided with a pressurizing unit that communicates with the suction probe, and the pressurizing unit and the metal probe are respectively electrically connected to the control system .

The fluid analyzer while drilling as described above, wherein a filter is arranged inside the suction probe, and the metal probe can move through the filter.

The fluid analyzer while drilling as described above, wherein a formation pressure tester is arranged between the suction module and the pressurization unit.

The above-mentioned fluid analyzer while drilling, wherein, the liquid outlet end of the analysis probe is connected with a plurality of sampling bottles.

The fluid analyzer while drilling as described above, wherein the liquid inlet end of the sampling bottle is provided with a sampling strain gauge, and the sampling strain gauge is electrically connected to the control system.

The above-mentioned fluid analyzer while drilling, wherein, the liquid outlet end of the analysis probe is connected with a sample tap.

The fluid analyzer while drilling as described above, wherein the analysis probe includes a hollow magnet, the liquid inlet port of the sample tube communicates with the suction module, the sample tube passes through the magnet, and the The antenna is wound on the outer wall of the sample tube, one end of the antenna is electrically connected to the control system, and the other end of the antenna is electrically connected to the data analysis receiving unit of the analysis unit.

The above-mentioned fluid analyzer while drilling, wherein the analysis probe includes a hollow magnet, the magnet is spliced by multi-section polarized magnets, the liquid inlet port of the sample tube communicates with the suction module, and the sample The tube passes through the magnet, and the helical antenna is wound on the outer wall of the sample tube. The antenna is composed of a first helical antenna and a second helical antenna, and the second helical antenna is helically arranged on the first helical antenna. One end of the first helical antenna is electrically connected to the control system, the other end of the first helical antenna is electrically connected to the magnet, and the second helical antenna is electrically connected to the analysis unit. The data analysis receiving unit is electrically connected.

The above-mentioned fluid analyzer while drilling, wherein, the magnet is a ring magnet, and the magnet is clamped in the magnetic steel skeleton.

The Fluid Analyzer While Drilling of the present invention has a simple structure and a simple assembly process, which brings great convenience to use. The Fluid Analyzer While Drilling can be used to quantitatively evaluate key information such as the composition and viscosity of the formation fluid during the drilling process, thereby It provides key information for the exploration and development of oil and gas. At the same time, the fluid analyzer while drilling of the present invention can move up and down in the well while drilling, and can measure the characteristic parameters of the fluid in the formation at different depths, improving measurement and accuracy. The fluid while drilling of the present invention The analyzer also has the advantage of quickly measuring the characteristic parameters of the formation fluid, that is, to achieve the purpose of timely measurement.

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present invention, and do not specifically limit the shapes and proportional dimensions of the components in the present invention. Under the teaching of the present invention, those skilled in the art can select various possible shapes and proportional dimensions according to specific conditions to implement the present invention.

Fig. 1 is the structural representation of the fluid analyzer while drilling of the present invention;

Fig. 2 is the structural representation of the analysis unit of the fluid analyzer while drilling of the present invention;

Fig. 3 is the structural representation of the first embodiment of the analysis probe of the present invention;

Fig. 4 is the structural representation of the second embodiment of analysis probe of the present invention;

Fig. 5 is the schematic diagram of connecting the magnet and the magnetic steel skeleton of the analysis probe of the present invention;

Fig. 6 is a structural schematic diagram of the antenna of the present invention;

Fig. 7 is the overall mode flowchart of the fluid analyzer while drilling of the present invention;

Fig. 8 is the fluid analysis flowchart of the fluid analyzer while drilling of the present invention;

9 is a schematic diagram of the magnetic field distribution in the central area of the magnet of the analysis probe of the present invention.

Detailed ways

The details of the present invention can be understood more clearly with reference to the accompanying drawings and the description of specific embodiments of the present invention. However, the specific embodiments of the present invention described here are only for the purpose of explaining the present invention, and should not be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible deformation based on the present invention, which should be considered as belonging to the scope of the present invention, and the present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 to Fig. 9 are respectively the structure diagram of the fluid analyzer while drilling of the present invention, the structure diagram of the analysis unit, the structure diagram of the first embodiment of the analysis probe, the structure diagram of the second embodiment of the analysis probe, the structure diagram of the analysis probe The schematic diagram of the connection between the magnet and the magnetic steel frame, the structural diagram of the antenna, the overall mode flow chart of the fluid analyzer while drilling, the fluid analysis flow chart of the fluid analyzer while drilling, and the magnetic field distribution diagram of the central area of the magnet of the analysis probe.

As shown in Figures 1 and 2, the fluid analyzer while drilling of the present invention includes: a short joint 2 connected to the drill pipe 1, and a housing cavity 21 capable of accommodating an analysis unit 3 is arranged in the short joint 2, and the analysis unit 3 includes A suction module 31 capable of sucking the fluid in the formation 4 and an analysis probe 32 capable of detecting the characteristic parameters of the fluid, the analysis probe 32 is connected to the suction module 31, that is, the fluid sucked by the suction module 31 is analyzed by the analysis probe 32, In order to analyze the characteristic parameters of the fluid in real time, the suction module 31 is in contact with the well wall 5, and the suction module 31 is electrically connected to the control system 6, so that the control system 6 on the ground can control the suction module 31 to the formation 4. The fluid in the drill pipe 1 is provided with a drainage tube 7 capable of delivering drilling fluid to the drill bit 11 , and the drainage tube 7 is located on one side of the analysis probe 32 .

Specifically, as shown in Figure 2, the suction module 31 in the present invention includes a suction probe 311, and a metal probe that can move relative to the suction probe 311 is provided in the suction probe 311 (the metal probe is not shown in the figure). ), an annular bladder is provided between the suction probe 311 and the well wall 5, and the annular bladder has vacuum sealing performance and is close to the well wall 5, which is conducive to forming a seal. The side of the suction probe 311 away from the annular bladder is provided with a The pressurizing unit 33 connected to the suction probe 311, the pressurizing unit 33 and the metal probe are electrically connected to the control system 6 respectively. Specifically, in the present invention, the pressurizing unit 33 adopts a high-pressure pump, and of course it can also be used Other pressurization devices are not specifically limited here. The pressurization unit 33 communicates with the suction probe 311 through the first pipeline 34. Further, a ground pressure tester is provided between the suction probe 311 and the pressurization unit 33. 35. The formation pressure tester 35 records the change of the formation pressure, and feeds back to the control system 6, that is, the formation pressure tester 35 is electrically connected to the control system 6, thereby realizing the control of the metal probe penetrating into the formation. At this time, The control system 6 activates the pressurization unit 33, and the pressurization unit 33 operates to suck the fluid in the formation 4 into the first pipeline 34 through the metal probe. There is a first pipeline between the formation pressure tester 35 and the pressurization unit 33. 35 is connected with the second pipeline 36, and the second pipeline 36 transports the fluid in the formation to the analysis unit 3, so as to realize the purpose of analyzing the characteristic parameters of the fluid.

Further, the suction probe 311 is provided with a filter screen 312, and the metal probe passes through the filter screen 312 and can move in the filter screen 312, so as to filter the fluid in the formation 4 and prevent the analysis probe 32 from clogging And it is beneficial to further increase the accuracy of the analysis of the fluid characteristic parameters (comprising parameters such as fluid composition, content, fluid viscosity, gasoline ratio) by the analysis probe 32, and the filter screen 312 filters the sucked fluid to prevent the first conduit 35 and the occurrence of the second conduit 36 blockage phenomenon.

Specifically, the liquid outlet end of the analysis probe 32 is connected with a plurality of sampling bottles 37, and further, the liquid inlet end of the sampling bottle 37 is provided with a sampling strain gauge 38, and the sampling strain gauge 38 is electrically connected with the control system 6, which realizes The sampling strain gauge 38 is used to record the filling pressure of the sampling bottle 37 during the sampling process, so that the control system 6 can control the closing of the valve of the sampling bottle 37 to prevent the fluid from overflowing from the sampling bottle 37. It is explained here that the sampling bottle 37 For multiple, only one sampling bottle 37 is schematically drawn in FIG. 2 .

Further, the liquid outlet end of the analysis probe 32 is also connected with a sample tap 80, specifically, the middle position of the third pipeline 39 is connected with the liquid outlet end of the second pipeline 36, and one port of the third pipeline 39 is connected with the sampling tap. The bottle 37 is connected, and the other end is connected with the sampling tap 80, that is, after the fluid in the formation 4 enters the analysis probe 32 for NMR measurement, a part of the fluid enters the sampling bottle 38 for storage, and the collected fluid sample is used on the ground. For fluid analysis experiments in the laboratory, another part of the fluid returns to the well through the sampling tap 80 .

Specifically, in the present invention, the analysis probe 32 adopts two different implementations.

As shown in Figure 3, when the analysis probe 32 is the first embodiment, the analysis probe 32 includes a hollow magnet 321 and an antenna 322, and the magnet 321 is electrically connected to the antenna 322, specifically, the liquid inlet port of the second conduit 36 It communicates with the suction module 31, and the second conduit 36 passes through the magnet 321. In the present invention, the magnet 321 adopts a one-piece magnet structure, the antenna 322 is a helical tube antenna, and the antenna 322 is wound on the outer wall of the second conduit, and the antenna 322 One end is electrically connected to the control system 6, and the other end is electrically connected to the data analysis receiving unit of the analysis unit 3. Further, as shown in FIG. 5, the magnet 321 adopts a tooth shape and is stuck in the magnetic steel skeleton 323, which facilitates the installation of the fluid analyzer while drilling of the present invention and prevents magnetic pole displacement between the magnets 321. Further, In the present invention, the toothed structure of the magnet 321 appears symmetrically in pairs up, down, left, and right, and the teeth 320 of the toothed structure are of the same size, that is, the teeth 320 of the magnet 321 appear symmetrically up, down, left, and right, and the sizes of the teeth 320 are the same. , so as to ensure that the magnet 321 is stably clamped in the magnetic steel skeleton 323. FIG. 5 only schematically shows that the magnet 321 adopts a toothed structure, and the magnetization direction of the magnet 321 is unipolar magnetization, forming a uniform field in the middle of the magnet 321. In the invention, the magnetic field strength is regulated by adjusting the inner diameter of the magnet 321. The smaller the inner diameter, the higher the field strength. The magnetic field at the center of the magnet 321 is as shown in Figure 9. The magnetic field (Magnetic Field, MF).

The antenna 322 is wound around the outside of the second flow guide tube 36 of the measurement section 324 inside the magnet 321, the outer wall of the second flow guide tube 36 is slotted, the antenna 322 is embedded in the groove, and is oil-filled and sealed. Layer metal shielding shell, thereby helps to protect antenna, prolongs the life-span of fluid analyzer while drilling of the present invention, the analysis of the characteristic parameter of fluid of the present invention adopts nuclear magnetic fluid analysis technology, wherein for the nuclear magnetic fluid analysis technology of fluid is current technology, and will not be described in detail here.

As shown in Figure 4, when the analysis probe 32 is the second embodiment, the analysis probe 32 includes a hollow magnet 521 and an antenna 522, the liquid inlet port of the second conduit 36 communicates with the suction module 31, and the second conduit 36 Through the magnet 521, in this embodiment, the magnet 521 is composed of a first magnet A, a second magnet B and a third magnet C spliced together, wherein the third magnet C corresponds to the measurement section, the first magnet A, the second magnet Both B and the third magnet C are annular magnets, and the magnetization direction is the overall unidirectional magnetization, and a relatively uniform magnetic field with a single direction of the magnet is generated inside the magnet 521. The magnetic field at the center of the magnet 521 is shown in Figure 9. From the magnet The schematic diagram of the magnetic field (Magnetic Field, MF) in the center within the range of length L from the upper end to the lower end of 521, as shown in FIG. In the screw slot of the first helical antenna 5221, the antenna 522 is a helical tube antenna, one end of the first helical antenna 5221 is electrically connected to the control system 6, the other end of the first helical antenna 5221 is electrically connected to the magnet 521, and the second end of the first helical antenna 5221 is electrically connected to the magnet 521. The helical antenna 5222 is electrically connected to the data analysis receiving unit of the analysis unit 3 . In this embodiment, the antenna 522 is a solenoid antenna, and the solenoid antenna is made of an enamelled copper wire (0.3-2 mm in diameter) or a deoxidized copper strip (0.1-2 mm in thickness). Winding outside the second conduit 36, the antenna 522 is a double solenoid discrete structure, and the antenna 522 is wound outside the wall of the second conduit 36 inside the measurement section of the magnet 521, that is, the corresponding second inside the magnet C. On the outer side of the pipe wall of the conduit 36, the outer wall of the second conduit 36 is slotted, the antenna 522 is embedded in the slot, and is oil-filled and sealed, and a metal shielding shell is coated on the sealing layer; in the state of fluid flow, the first helical antenna 5221 Due to the emission of the pulse signal, the pulse signal is transmitted to the magnet 521, the pulse signal is transmitted to the magnet 521 to generate a magnetic field, the magnet 521 itself will generate an inherent magnetic field, and the two magnetic fields will generate a resonance magnetic field, so as to realize the characteristics of the fluid. For the analysis of parameters, the second helical antenna 5222 is used to receive the magnetic resonance signal, and transmit the signal to the data analysis receiving unit of the analysis unit 3, so as to obtain the characteristic parameters of the fluid. Among them, the nuclear magnetic fluid analysis technology for the fluid is currently technology, and will not be described in detail here. As shown in Figure 5, high magnetic permeability steel 523 should be added to the outside of the whole magnet 521 to bind the magnetic force lines, so that the entire magnetic field is located inside the high magnetic permeability steel 523, so that the magnetic field does not leak out, and the entire fluid analysis probe 32 is small enough (diameter 3 to 5 cm), and embedded in the housing cavity 21 for fixing, further, the magnet 521 also adopts a tooth shape, and is stuck in the magnetic steel skeleton 523, which is convenient for the installation of the fluid analyzer while drilling of the present invention, and prevents the magnet from Magnetic pole shift occurs between 521. In a specific embodiment of the present invention, the tooth-like structure of the magnet 521 appears symmetrically in pairs up, down, left, and right, and the teeth 320 of the tooth-like structure are of the same size, that is, the teeth 320 of the magnet 521 It appears symmetrically up and down, left and right, and each tooth portion 320 is substantially consistent, so as to ensure that the magnet 521 is stably clamped in the magnetic steel skeleton 523. FIG. 5 only schematically shows that the magnet 521 adopts a toothed structure, and the magnetization direction of the magnet 521 is Unipolar magnetization forms a uniform field in the middle of the magnet 521. In the present invention, the magnetic field strength is adjusted by adjusting the inner diameter of the magnet 521. The smaller the inner diameter, the higher the field strength.

Preferably, the structure of the magnet 321/521 of the fluid analysis probe 32 can be a structure such as a double bar magnet, a Halbach nested magnet; a relatively uniform magnetic field is formed in the middle of the magnet 321/521 for relaxation time (T ₁ , T ₂ ) measurement, a gradient magnetic field is formed near the inside of the magnet 321/521 for the measurement of the diffusion coefficient (D); the discrete structure of the antenna 521 can adopt the first helical antenna 5221 as a solenoid, and the second The helical antenna 5222 is a saddle-shaped antenna, which removes the coupling between the first helical antenna 5221 and the second helical antenna 5222; in the static measurement mode, only the solenoid antenna can be used for measurement.

Specifically, in the present invention, the fluid analyzer while drilling has multiple working modes, including: waiting mode while drilling and fluid analysis mode. As shown in Fig. 7, it is a schematic diagram of the overall workflow of the fluid analyzer while drilling. First, the surface control system 6 sends out a signal, and the fluid analyzer while drilling enters the standby mode while drilling, and the fluid analyzer while drilling does not perform collection and analysis work during the drilling process. The drilling operation is stopped, and the feedback is sent to the ground control system 6, and the analysis unit 3 enters the standby state; after the preparation work is completed, the downhole instrument will feed back the status to the ground control system 6, and the metal probe will penetrate into the formation, and then the pressurization unit 33 will be activated. Start fluid analysis mode. After the fluid analysis data is collected by the acquisition system, it is fed back to the ground control system 6, so that the fluid analysis working mode is stopped, and then the standby working mode while drilling is continued.

As shown in Figure 8, the fluid analysis mode is further divided into a static fluid measurement mode and a flow measurement mode. One-dimensional T ₁ , T ₂ and two-dimensional T ₁ -T ₂ measurements can be performed in a static state; in the fluid flow analysis mode, one-dimensional T ₁ and T ₂ measurements of fluid flow can be performed under the condition of a shorter time , under time-rich conditions, one-dimensional T ₁ , T ₂ and two-dimensional T ₁ -T ₂ measurements of static fluids can also be performed.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A fluid analyzer while drilling, characterized in that, the fluid analyzer while drilling comprises: A short joint connected with the drill pipe, the short joint is provided with an accommodation cavity capable of accommodating the analysis unit; The analysis unit includes a suction module for pumping fluid in the formation and an analysis probe capable of detecting characteristic parameters of the fluid, the analysis probe is connected to the suction module, and the suction module is in contact with the well wall; The suction module is electrically connected to the control system; A drainage tube capable of delivering drilling fluid to the drill bit is arranged inside the drill rod, and the drainage tube is arranged on one side of the analysis probe. 2. The fluid analyzer while drilling as claimed in claim 1, wherein the suction module comprises a suction probe, and a movable metal probe is arranged in the suction probe, and the suction probe is connected to the suction probe. An annular leather bag is arranged between the walls of the well, and the side of the suction probe away from the annular bag is provided with a pressurizing unit connected with the suction probe, and the pressurizing unit and the metal probe are respectively connected to the The control system is electrically connected to each other. 3 . The fluid analyzer while drilling according to claim 2 , wherein a filter screen is arranged inside the suction probe, and the metal probe can move through the filter screen. 4 . 4. The fluid analyzer while drilling according to claim 2 or 3, characterized in that a formation pressure tester is arranged between the suction module and the pressurizing unit. 5. The fluid analyzer while drilling according to claim 1, wherein a plurality of sampling bottles are connected to the liquid outlet end of the analysis probe. 6 . The fluid analyzer while drilling according to claim 5 , wherein the liquid inlet end of the sampling bottle is provided with a sampling strain gauge, and the sampling strain gauge is electrically connected to the control system. 7 . 7. The fluid analyzer while drilling according to claim 5 or 6, characterized in that, the liquid outlet end of the analysis probe is connected with a sample tap. 8. The fluid analyzer while drilling as claimed in claim 1, wherein the analysis probe comprises a hollow magnet, the liquid inlet port of the sample tube is communicated with the suction module, and the sample tube passes through the A magnet, an antenna electrically connected to the magnet is wound around the outer wall of the sample tube, one end of the antenna is electrically connected to the control system, and the other end of the antenna is electrically connected to the data analysis receiving unit of the analysis unit catch. 9. The fluid analyzer while drilling as claimed in claim 1, wherein the analysis probe comprises a hollow magnet, and the magnet is spliced by multi-section polarized magnets, and the liquid inlet port of the sample tube is connected to the pumping port. The suction module is connected, the sample tube passes through the magnet, and the helical antenna is wound on the outer wall of the sample tube, the antenna is composed of a first helical antenna and a second helical antenna, and the second helical antenna is helically arranged In the screw seam of the first helical antenna, one end of the first helical antenna is electrically connected to the control system, the other end of the first helical antenna is electrically connected to the magnet, and the second end of the helical antenna is electrically connected to the magnet. The helical antenna is electrically connected to the data analysis receiving unit of the analysis unit. 10. The fluid analyzer while drilling according to claim 8 or 9, wherein the magnet is a ring magnet, and the magnet is clamped in the magnetic steel frame.