CN117990789A - Rock acoustic wave characteristic testing method, system and device - Google Patents

Abstract

The invention relates to the technical field of rock acoustic wave characteristic test, in particular to a rock acoustic wave characteristic test method, a rock acoustic wave characteristic test system and a rock acoustic wave characteristic test device, which comprise the steps of collecting a target rock sample; placing a sample into an acoustic wave characteristic testing device; vacuumizing the sound wave characteristic testing device; injecting carbon dioxide into the acoustic wave characteristic testing device; changing the pressure and temperature in the acoustic wave characteristic testing device so as to change the state of carbon dioxide; detecting a rock sample in real time through an ultrasonic probe in the acoustic wave characteristic testing device; according to the invention, the acoustic wave test is carried out on the premise of not changing the external environment of the rock, the acoustic response of the rock can be obtained in a continuous test manner, the change process of the shale internal structure under different states is quantitatively represented, the result is more accurate, and the measured data is more comprehensive.

Description

A rock acoustic wave characteristic testing method, system and device

Technical Field

The invention relates to the technical field of rock sonic wave characteristic testing, in particular to a rock sonic wave characteristic testing method, system and device.

Background technique

CO2 will undergo phase change during the fracturing process. Different states of CO2 fracturing will produce different fracture pressures and different fracture networks. Sound waves can effectively reflect changes in the internal structure of rocks. The frequency of sound waves, the type of waves, the structure of rocks, and the water content will all affect the acoustic response. Currently, the study of the effect of CO2 pre-fluid on rocks mainly uses immersion methods. After the rocks are soaked, they are taken out for mechanical or acoustic testing. Mechanical testing will destroy the samples, and acoustic testing with pre-fluid immersion can reflect changes in the internal structure of rocks to a certain extent.

The traditional acoustic wave test of rock samples after carbon dioxide immersion requires soaking the rock samples in different environments, taking them out for acoustic wave testing after the reaction is complete, and repeating this process many times. This method, firstly, changes the environment in which the rock is located during the test, reducing the accuracy of the results; secondly, it cannot obtain the acoustic response of the rock in real time, and cannot fully present the structural evolution characteristics of the rock during the process of carbon dioxide immersion in different states.

To this end, the present invention proposes a rock acoustic wave characteristic testing method and system.

In the actual testing process, it is necessary to use multi-band sound waves for multiple tests. Traditional ultrasonic probes are generally fixed by brackets, installed by adhesives, or locked by brackets, which is inconvenient to replace. For this reason, the present invention also proposes a rock acoustic wave characteristics testing device based on a multi-state carbon dioxide environment.

Summary of the invention

In view of the problem in the prior art that the accuracy of the data during the test is affected by the change of the environment after the rock sample is taken out, the present invention is proposed.

Therefore, the object of the present invention is to provide a method, system and device for testing rock acoustic wave characteristics.

In order to solve the above technical problems, the present invention provides the following technical solutions: a method for testing rock acoustic wave characteristics, comprising:

Collect target rock samples;

The sample is placed in the sonic characteristic testing device;

Perform vacuum treatment on the sonic characteristic testing device;

Injecting carbon dioxide into the sonic characteristic testing device;

Changing the pressure and temperature in the acoustic wave characteristic test device to change the state of carbon dioxide;

The rock samples are tested in real time by using the ultrasonic probe in the acoustic wave characteristic testing device.

The beneficial effects of the rock acoustic wave characteristic testing method of the present invention are as follows: the present invention performs acoustic wave testing without changing the external environment of the rock, can perform uninterrupted testing, dynamically and in real time obtain the acoustic response of the rock, quantitatively characterize the changing process of the internal structure of the shale under different conditions, and the results are more accurate and the measured data are more comprehensive.

In order to solve the above technical problems, the present invention also provides the following technical solutions: a rock sonic characteristic testing system, comprising a sonic characteristic testing device, and a vacuum pump and a carbon dioxide cylinder connected to the sonic characteristic testing device, the sonic characteristic testing device is connected to an oil bath, and also comprises a sonic signal transmitting device and a sonic signal receiving device arranged on the sonic characteristic testing device, and the sonic signal receiving device is connected to a sonic signal processing device.

As a preferred solution of the rock acoustic wave characteristics testing system of the present invention, the carbon dioxide cylinder is connected to a booster pump, the booster pump is connected to an intermediate container, and the carbon dioxide cylinder is connected to the acoustic wave characteristics testing device through the booster pump, the intermediate container.

As a preferred solution of the rock acoustic wave property testing system of the present invention, the intermediate container is connected to a first pressure gauge, the acoustic wave property testing device is connected to a second pressure gauge, and the oil bath is connected to a temperature gauge.

The beneficial effects of the rock acoustic wave characteristic testing system of the present invention are as follows: the present invention performs acoustic wave testing without changing the external environment of the rock, can perform uninterrupted testing, dynamically and in real time obtain the acoustic response of the rock, and quantitatively characterize the changing process of the internal structure of the shale under different states; the acoustic characteristics of the shale can also be measured from different angles, and the heterogeneity of the rock and the heterogeneity under the action of CO2 in different states can be quantitatively characterized; at the same time, the present invention can also control the water content of the sample to study the evolution law of the internal structure of the rock under the action of dry, wet and semi-dry CO2, and provide theoretical guidance for the design of carbon dioxide fracturing schemes.

In actual use, there is still the problem of inconvenience in replacing the probe.

In order to solve the above technical problems, the present invention also provides the following technical solutions: a rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment, comprising a processing chamber, and a fixed bracket fixedly arranged in the processing chamber, a limit mechanism fixedly installed in the fixed bracket, and also comprising a mounting mechanism slidably arranged in the limit mechanism, and a detection probe fixedly arranged at the end of the mounting mechanism;

The mounting mechanism comprises a sleeve assembly slidably disposed in the limiting mechanism, and an insert slidably disposed in the sleeve assembly, and also comprises a connecting member disposed on the sleeve assembly, and a convex disc is fixedly mounted on the end of the sleeve assembly;

The socket assembly comprises a socket sleeve and a slot arranged in the socket sleeve, the outer wall of the socket sleeve is provided with a groove, and the surface of the groove is provided with a smooth groove and a guide groove;

The insert comprises a square column slidably arranged on the inner wall of the slot, and an adhesive plate fixedly arranged on the end of the square column, the end of the square column is provided with a flat surface and an inclined surface, and also comprises a curved groove arranged on the surface of the square column;

The connecting member includes a sliding rod slidably arranged in the smooth groove, a connecting rod fixedly arranged at the end of the sliding rod, and a clamping column fixedly arranged at the end of the connecting rod, and the end of the clamping column is connected to a first tension spring.

As a preferred solution of the rock acoustic wave characteristics testing device based on a multi-state carbon dioxide environment of the present invention, the guide groove includes a parallel groove, a deflection groove and a return groove arranged on the groove, and the two ends of the parallel groove are respectively connected to the deflection groove and the return groove.

As a preferred solution of the rock acoustic wave property testing device based on a multi-state carbon dioxide environment of the present invention, wherein: an upward push surface is provided on the return groove.

As a preferred solution of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment of the present invention, wherein: the limiting mechanism includes a limiting sleeve fixedly arranged in the fixed bracket, and a tooth groove arranged on the inner wall of the limiting sleeve;

The sleeve assembly further comprises a receiving groove provided on the inner wall of the sleeve sleeve, and a convex strip provided in the receiving groove, and the inner wall of the sleeve sleeve is provided with a deflection surface;

The mounting mechanism further includes a clamping assembly disposed in the sleeve assembly, the clamping assembly includes a support shaft fixedly disposed on the inner wall of the sleeve sleeve, and a deflection member rotatably disposed on the outer wall of the support shaft, and also includes a positioning member slidably disposed on the inner wall of the accommodating groove, and the deflection member is connected to a second tension spring;

The deflection member comprises a deflection plate rotatably arranged on the outer wall of the support shaft, and an arc-shaped extrusion block arranged on the deflection plate;

The positioning member includes a resistance block slidably arranged on the inner wall of the accommodating groove, and a latching tooth arranged on the resistance block. The surface of the resistance block is provided with a pushing surface and also includes a slope surface arranged on the latching tooth.

As a preferred solution of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment of the present invention, wherein: the sleeve assembly further includes a notch provided on the containing groove, and a protrusion provided on the containing groove;

The deflecting member further comprises a pushing block arranged on the deflecting plate.

As a preferred solution of the rock acoustic wave property testing device based on a multi-state carbon dioxide environment of the present invention, the processing chamber includes a box body, a conveying pipeline arranged on the box body, and a sealing cover plate arranged on the box body.

The beneficial effects of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment of the present invention are as follows: when installing the detection probe, it is only necessary to insert the insert into the slot and connect it through the clamping column and the curved groove on the connecting piece to complete the installation; when disassembling, it is only necessary to pull out the insert and push the clamping column out through the curved groove to complete the disassembly, which is convenient for disassembly and installation. At the same time, due to the presence of the first tension spring, combined with the square column that can slide in the slot, the detection probe can maintain a fit with the object being measured during measurement.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

FIG1 is a schematic diagram of the overall framework of the rock acoustic wave characteristics testing system.

Figure 2 is a comparison chart of the results of sample No. 1 and sample No. 2.

FIG3 is a schematic diagram of the internal structure of a rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

FIG4 is a schematic diagram of the overall structure of a rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

FIG5 is a schematic diagram of the connection structure of the limiting mechanism and the mounting mechanism of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

FIG6 is a schematic diagram of the structure of the snap-on assembly of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

FIG. 7 is a schematic diagram of the socket assembly structure of the rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

FIG8 is a schematic diagram of the structure of the deflection member and the positioning member of the rock acoustic wave characteristic testing device based on the multi-state carbon dioxide environment.

FIG9 is a schematic diagram of the connection structure of the connector, smooth groove, and guide groove of the rock acoustic wave characteristics testing device based on a multi-state carbon dioxide environment.

Detailed ways

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

Embodiment 1, referring to FIG. 2 , is the first embodiment of the present invention, which provides a method for testing rock acoustic wave characteristics, comprising:

Collect target rock samples;

The sample is placed in the sonic characteristic testing device;

Perform vacuum treatment on the sonic characteristic testing device;

Injecting carbon dioxide into the sonic characteristic testing device;

Changing the pressure and temperature in the acoustic wave characteristic test device to change the state of carbon dioxide;

The rock samples are tested in real time by using the ultrasonic probe in the acoustic wave characteristic testing device.

Specifically, it is explained in combination with actual test cases: the shale with a depth of 1853.21m in the Chang 7th section of the Yanchang Formation in the Ordos Basin was taken as the research object, and two samples with similar physical properties were selected. Sample No. 1 has a porosity of 1.11% and a permeability of 0.00172mD, and Sample No. 2 has a porosity of 1.10% and a permeability of 0.00170mD. There are no cracks visible to the naked eye in either sample.

First, a 100Hz probe was used to measure the sound waves of samples No. 1 and No. 2 at a confining pressure of 20MPa;

Place sample No. 1 in the test container, inject carbon dioxide, control the pressure at 25MPa, and set the temperature to 60℃;

After soaking for 3 hours, take it out and measure the sound wave of sample No. 1 using a 100 Hz probe;

Continue to immerse under the same conditions, take out after 3 hours, and measure the sound waves with a 100 Hz probe;

The acoustic response after immersion for 3h/6h/12h/24h/48h was obtained;

Place sample No. 2 into the sonic characteristic testing device;

Use a vacuum pump to evacuate the gas in the test container and inject carbon dioxide;

Inject carbon dioxide, control the pressure at 25 MPa, and set the temperature at 60°C;

The acoustic response of the rock sample is measured in real time using a 100Hz probe;

Compare and analyze the experimental results of sample No. 1 and sample No. 2;

The results of the acoustic time difference measured for sample No. 1 and sample No. 2 are shown in the following table:

Time (h) 0 3 6 12 twenty four 48 No. 1 sound wave time difference (μs/m) 188.86 190.25 191.62 195.51 196.18 196.72 No. 2 sound wave time difference (μs/m) 188.48 191.03 193.12 195.04 196.27 196.67

The comparison of the acoustic wave time difference results of sample No. 1 and sample No. 2 is shown in Figure 2.

By comparing the results in the table and Figure 2, we can find that the data of sample 2 is more regular than that of sample 1. This is because sample 2 was tested without changing the environment. The data of sample 1 is volatile. After it was taken out, the external environment was changed, and the internal structure of the rock changed, so the measured results are not accurate. At the same time, the designed device can not only measure the longitudinal waves at a single frequency, but also the transverse waves and acoustic responses in different directions, and the data is more comprehensive.

From the results, it can be seen that the improved equipment has more accurate results and more comprehensive measured data.

In summary, the present invention performs acoustic wave testing without changing the external environment of the rock, can perform uninterrupted testing, dynamically and in real time obtain the acoustic response of the rock, and quantitatively characterize the changing process of the internal structure of the shale under different conditions. The present invention can also measure the acoustic characteristics of the shale from different angles, and quantitatively characterize the heterogeneity of the rock and the heterogeneity under the action of CO2 in different states; at the same time, the present invention can also control the water content of the sample to study the evolution law of the internal structure of the rock under the action of dry, wet and semi-dry CO2, and provide theoretical guidance for the design of carbon dioxide fracturing schemes.

Embodiment 2, referring to FIG1, is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a rock acoustic wave characteristic testing system, characterized in that it includes an acoustic wave characteristic testing device, and a vacuum pump and a carbon dioxide gas cylinder connected to the acoustic wave characteristic testing device, the acoustic wave characteristic testing device is connected to an oil bath, and also includes an acoustic wave signal transmitting device and an acoustic wave signal receiving device arranged on the acoustic wave characteristic testing device, the acoustic wave signal receiving device is connected to an acoustic wave signal processing device. In this embodiment, the vacuum pump is used to evacuate the acoustic wave characteristic testing device, the carbon dioxide gas cylinder is used to release carbon dioxide, the oil bath is used to heat the acoustic wave characteristic testing device, the acoustic wave signal transmitting device cooperates with the acoustic wave signal receiving device to complete the acoustic wave test, and the measured data is converted and output through the acoustic wave signal processing device.

Specifically, the carbon dioxide cylinder is connected to a booster pump, and the booster pump is connected to an intermediate container. The carbon dioxide cylinder is connected through the booster pump, the intermediate container and the ultrasonic characteristic testing device. In this embodiment, the booster pump is used to pressurize the output carbon dioxide gas, and the intermediate container is used as a buffer transition of the gas.

Furthermore, a first pressure gauge is connected to the intermediate container, a second pressure gauge is connected to the ultrasonic characteristic testing device, and a thermometer is connected to the oil bath. In this embodiment, the first pressure gauge is used to detect the air pressure in the intermediate container, the second pressure gauge is used to detect the air pressure in the ultrasonic characteristic testing device, and the thermometer is used to measure the temperature value of the oil bath.

It should be noted that a valve is provided between the carbon dioxide cylinder and the booster pump, a valve is provided between the intermediate container and the ultrasonic characteristic testing device, and a valve is provided between the ultrasonic characteristic testing device and the vacuum pump, so as to facilitate the control of the input and output gases, and a valve is provided between the oil bath and the ultrasonic characteristic testing device, so as to facilitate the temperature control.

When in use, the sample to be tested is placed in the sonic characteristic testing device, the carbon dioxide is released from the carbon dioxide cylinder and pressurized by the booster pump, the gas enters the sonic characteristic testing device through the intermediate container, the sample is tested, the sonic signal transmitting device cooperates with the sonic signal receiving device to complete the sonic test, and the measured data is converted and output by the sonic signal processing device. By changing the temperature and pressure in the sonic characteristic testing device, the state of carbon dioxide can be changed. The sonic test is performed without changing the external environment of the rock. The test can be carried out uninterruptedly, and the acoustic response of the rock can be obtained dynamically and in real time, and the change process of the internal structure of the shale under different states can be quantitatively characterized; the acoustic characteristics of the shale can also be measured from different angles, and the heterogeneity of the rock and the heterogeneity under the action of CO2 in different states can be quantitatively characterized; at the same time, the present invention can also control the water content of the sample to study the evolution law of the internal structure of the rock under the action of dry, wet and semi-dry CO2, and provide theoretical guidance for the design of carbon dioxide fracturing schemes.

Embodiment 3, referring to FIG. 3 to FIG. 9 , is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment.

Specifically, it includes a processing chamber 100, and a fixed bracket 200 fixed in the processing chamber 100, a limiting mechanism 300 is fixedly installed in the fixed bracket 200, and also includes a mounting mechanism 400 slidably arranged in the limiting mechanism 300, and a detection probe 500 is fixedly provided at the end of the mounting mechanism 400; in this embodiment, the processing chamber 100 includes a box body 101, and a conveying pipe 102 arranged on the box body 101, and also includes a sealing cover plate 103 arranged on the box body 101, the conveying pipe 102 can input and output gas, and can change the pressure in the processing chamber 100 after being connected to a vacuum pump, and the detection probe 500 is an ultrasonic probe.

It should be noted that fixed brackets 200 are provided on the five inner wall surfaces of the box body 101, and a fixed bracket 200 is also provided at the bottom of the sealing cover plate 103, that is, six detection probes 500 are provided, which can detect the sample to be detected in the up and down, left and right, front and back directions.

Furthermore, the installation mechanism 400 includes a socket assembly 401 slidably disposed in the limiting mechanism 300, and an insert 402 slidably disposed in the socket assembly 401, and also includes a connecting member 403 disposed on the socket assembly 401, and a boss 405 is fixedly mounted on the end of the socket assembly 401.

Furthermore, the socket assembly 401 includes a socket sleeve 401a, and a slot 401b arranged in the socket sleeve 401a, the outer wall of the socket sleeve 401a is provided with a groove 401c, and the surface of the groove 401c is provided with a smooth groove 401d and a guide groove 401e; in the present embodiment, there are two grooves 401c, two smooth grooves 401d and two guide grooves 401e, which are symmetrically arranged on the outer wall of the socket sleeve 401a, and the smooth groove 401d and the slot 401b are arranged horizontally.

Preferably, the insert 402 includes a square column 402a slidably arranged on the inner wall of the slot 401b, and an adhesive disk 402b fixedly arranged on the end of the square column 402a. The end of the square column 402a is provided with a plane 402c and an inclined surface 402d, and also includes a curved groove 402e arranged on the surface of the square column 402a. In this embodiment, the square setting of the square column 402a can prevent the insert 402 from rotating after being inserted into the slot 401b. The adhesive disk 402b is used to install the detection probe 500, and the detection probe 500 can be adhered to the adhesive disk 402b by an adhesive; the position of the plane 402c is opposite to the position of the smooth groove 401d, the position of the inclined surface 402d is opposite to the position of the guide groove 401e, and the curved groove 402e is symmetrically arranged on both sides of the square column 402a.

It should be noted that the connecting member 403 includes a sliding rod 403a slidably arranged in the smooth groove 401d, and a connecting rod 403b fixedly arranged at the end of the sliding rod 403a, and also includes a clamping column 403c fixedly arranged at the end of the connecting rod 403b, and the end of the clamping column 403c is connected to a first tension spring 403d. In this embodiment, one end of the first tension spring 403d is connected to the groove 401c, the outer wall of the clamping column 403c is slidably connected to the inner wall of the guide groove 401e, and the outer wall of the clamping column 403c is slidably connected to the inner wall of the curved groove 402e. Both ends of the sliding rod 403a are fixedly installed with connecting rods 403b, and each connecting rod 403b is fixedly installed with a clamping column 403c. Two first tension springs 403d are arranged at the end of each clamping column 403c, and they are symmetrically arranged to form a V-shaped structure. Under the joint action of the two first tension springs 403d, the clamping column 403c can have a movement tendency to be located in the middle of the guide groove 401e.

The guide groove 401e includes a parallel groove 401e-1, a deflection groove 401e-2 and a return groove 401e-3 arranged on the groove 401c. The two ends of the parallel groove 401e-1 are respectively connected with the deflection groove 401e-2 and the return groove 401e-3. In this embodiment, the parallel groove 401e-1 and the smooth groove 401d are arranged in parallel, the deflection groove 401e-2 is arranged at one end of the parallel groove 401e-1 close to the smooth groove 401d, and the return groove 401e-3 is arranged at one end of the parallel groove 401e-1 away from the smooth groove 401d.

An upper push surface 401e-4 is provided on the return groove 401e-3, and the upper push surface 401e-4 is inclined.

When installing the detection probe 500, the adhesive disc 402b and the detection probe 500 are first bonded together by adhesive. In the initial state, the insert 402 is not inserted into the interior of the socket assembly 401. Under the tension of the first tension spring 403d, the clamping column 403c is located in the middle of the parallel groove 401e-1.

It should be noted that the length of the smooth groove 401d is set to d1, the length of the parallel groove 401e-1 is set to d2, d1>d2, the distance between the slide bar 403a and the clamping column 403c is set to h1, the distance between the end of the parallel groove 401e-1 close to the return groove 401e-3 and the end of the smooth groove 401d close to the return groove 401e-3 is set to h2, and the distance between the end of the parallel groove 401e-1 close to the deflection groove 401e-2 and the end of the smooth groove 401d close to the deflection groove 401e-2 is set to h3. The distance between the two ends of the parallel groove 401e-1 and the parallel groove 401e-2 is set to h3, h3=h1>h2, the deflection groove 401e-2 is arc-shaped, and its center is located at one end of the smooth groove 401d close to the deflection groove 401e-2. When the slide rod 403a slides to one end of the smooth groove 401d close to the deflection groove 401e-2, the clamping column 403c can slide from the parallel groove 401e-1 into the deflection groove 401e-2 through deflection, and the movement trajectory of the clamping column 403c in the deflection groove 401e-2 is located on the rotation trajectory s.

When installing the insert 402 and the socket assembly 401, the insert 402 is inserted into the slot 401b, and the inclined surface 402d at the end of the square column 402a first pushes the clamping column 403c, and then pushes the connecting member 403 to slide as a whole, until the slide bar 403a slides to the end of the smooth groove 401d close to the deflection groove 401e-2. Since the slide bar 403a cannot slide, the square column 402a is continued to be pushed, and the square column 402a contacts the clamping column 403c through the inclined surface 402d thereon, so that the clamping column 403c rotates along the deflection groove 401e-2 until the plane 402c on the square column 402a contacts the slide bar 403a. The curved groove 402e and the deflection groove 401e-2 on a are aligned, and under the pulling force of the first tension spring 403d, the pulling column 403c is rotated in the deflection groove 401e-2, so that the column 403c is stuck in the curved groove 402e, and the column 403c enters the parallel groove 401e-1. When the insertion operation of the insert 402 is stopped, under the pulling force of the first tension spring 403d, the square column 402a slides on the inner wall of the slot 401b, so that the square column 402a extends out from the slot 401b, and the column 403c slides to the middle of the parallel groove 401e-1 to complete the installation. At this time, since the column 403c is stuck in the curved groove 402e, the insert 402 can be connected to the socket assembly 401.

When conducting sample testing, the square column 402a can slide inside the slot 401b. First, by pushing the square column 402a into the slot 401b, the distance between each detection probe 500 is increased to facilitate the placement of the sample. After the placement is completed, combined with the tension of the first tension spring 403d, the detection probe 500 can be attached to the surface of the sample to be tested, ensuring the fit and improving the accuracy of the measurement. The sample can also be clamped and positioned by multiple detection probes 500. Combined with the tension of the first tension spring 403d, the fixing effect can be improved to position the sample.

During detection, carbon dioxide gas is introduced into the processing chamber 100 to change the pressure and temperature in the processing chamber 100. The sample is detected in real time through the detection probe 500 without taking out the sample, thereby improving the accuracy of the measurement.

When replacing the detection probe 500, it is only necessary to pull the square column 402a out of the slot 401b. During the pulling process, the slide bar 403a slides on the inner wall of the smooth groove 401d, and the clamping column 403c slides on the inner wall of the parallel groove 401e-1 until the end of the clamping column 403c slides to the end of the parallel groove 401e-1 close to the return groove 401e-3. At this time, the clamping column 403c can no longer slide. Since d1>d2 and h3=h1>h2, the clamping column 403c can slide with the guidance of the curved groove 402e on the clamping column 403c. The card column 403c moves into the return groove 401e-3, and the card column 403c disengages from the curved groove 402e. During the process of the card column 403c sliding into the return groove 401e-3, the slide bar 403a slides inside the smooth groove 401d. Finally, the card column 403c and the curved groove 402e are disengaged, and the insert 402 is pulled out of the socket assembly 401 to achieve disassembly. Under the pulling force of the first tension spring 403d and the guidance of the upper push surface 401e-4, the card column 403c will return to the middle of the parallel groove 401e-1 again for reset.

In summary, when installing the detection probe 500, it is only necessary to insert the insert 402 into the slot 401b, and the installation can be completed by locking the clamping column 403c and the curved groove 402e on the connecting member 403. When disassembling, it is only necessary to pull out the insert 402, and push the clamping column 403c out through the curved groove 402e to complete the disassembly, which is convenient for disassembly and installation. At the same time, due to the presence of the first tension spring 403d, combined with the square column 402a that can slide in the slot 401b, the detection probe 500 can maintain a fit with the object being measured during measurement; after fixing the core, the present invention changes the external environment, thereby changing the state of carbon dioxide in contact with the rock, and through a combination of multiple groups and multiple frequencies of probes, real-time acoustic response is measured, and then the structural evolution characteristics of the rock in different states are quantitatively characterized, and the measured results are more accurate.

Embodiment 4, referring to Figures 3 to 9, is the fourth embodiment of the present invention. Different from the previous embodiment, the limiting mechanism 300 includes a limiting sleeve 301 fixed in the fixed bracket 200, and a tooth groove 302 provided on the inner wall of the limiting sleeve 301; in this embodiment, a plurality of tooth grooves 302 are provided, and are evenly spaced and distributed on the inner wall of the limiting sleeve 301.

Preferably, the socket assembly 401 also includes a receiving groove 401f provided on the inner wall of the socket sleeve 401a, and a convex strip 401g provided in the receiving groove 401f, and the inner wall of the socket sleeve 401a is provided with a deflection surface 401h; the mounting mechanism 400 also includes a clamping assembly 404 provided in the socket assembly 401, the clamping assembly 404 includes a support shaft 404a fixedly provided on the inner wall of the socket sleeve 401a, and a deflection member 404b rotatably provided on the outer wall of the support shaft 404a, and also includes a positioning member 404c slidably provided on the inner wall of the receiving groove 401f, and a second tension spring 404d is connected to the deflection member 404b; in the present embodiment, the deflection surface 401h is an arc-shaped surface, the center of which coincides with the axis of the support shaft 404a, and the end of the second tension spring 404d is connected to the inner wall of the slot 401b.

It should be noted that the deflection member 404b includes a deflection plate 404b-1 rotatably arranged on the outer wall of the support shaft 404a, and an arc-shaped extrusion block 404b-2 arranged on the deflection plate 404b-1; in this embodiment, the deflection plate 404b-1 can rotate on the outer wall of the support shaft 404a, and through the setting of the deflection surface 401h, the arc-shaped extrusion block 404b-2 and the deflection plate 404b-1 can rotate.

Furthermore, the positioning member 404c includes a resistance block 404c-1 slidably arranged on the inner wall of the accommodating groove 401f, and a latch tooth 404c-2 arranged on the resistance block 404c-1. The surface of the resistance block 404c-1 is provided with a pushing surface 404c-3, and also includes a slope surface 404c-4 arranged on the latch tooth 404c-2. In this embodiment, the setting of the convex strip 401g can limit the latch tooth 404c-2 from sliding out of the accommodating groove 401f, and the pushing surface 404c-3 is an arc surface.

Furthermore, the socket assembly 401 also includes a slot 401i provided on the accommodating groove 401f, and a protrusion 401j provided on the accommodating groove 401f; the deflection member 404b also includes a pushing block 404b-3 provided on the deflection plate 404b-1. In the present embodiment, the slot 401i is used to accommodate the pushing block 404b-3, and the protrusion 401j is used to limit the interference block 404c-1 from sliding into the slot 401b.

It should be noted that the tension of the second tension spring 404d can pull the deflection member 404b so that the deflection plate 404b-1 has a movement tendency close to the protrusion 401j, and the protrusion 401j is used to resist the deflection plate 404b-1 and limit the rotation angle of the deflection plate 404b-1.

The rest of the structure is the same as that of Example 3.

When the position of the detection probe 500 needs to be adjusted, the square column 402a is inserted into the slot 401b, so that the slide rod 403a pushes the deflection plate 404b-1 to rotate. After the deflection plate 404b-1 rotates, the arc-shaped extrusion block 404b-2 and the resistance block 404c-1 are misaligned. At this time, the resistance block 404c-1 and the latch 404c-2 can slide in the accommodating groove 401f. By pulling the sleeve 401a, the sleeve 401a slides on the inner wall of the limiting sleeve 301, and the latch 404c-2 slides into the accommodating groove 401f under the guidance of the slope surface 404c-4 thereon. The protrusion 401j can resist the resistance block 404c-1 to limit the resistance block 404c-1 from sliding out of the accommodating groove 401f. After the detection probe 500 is adjusted, , under the action of the first tension spring 403d, the slide rod 403a will slide back to its original position and lose the resistance to the deflection plate 404b-1. The tension of the second tension spring 404d can pull the deflection member 404b to make the deflection plate 404b-1 deflect. During the deflection, the pushing surface 404c-3 is first pushed by the pushing block 404b-3, and then the pushing surface 404c-3 is squeezed by the arc-shaped extrusion block 404b-2, so that the locking tooth 404c-2 is stuck in the tooth groove 302. Since the arc-shaped extrusion block 404b-2 finally conflicts with the resistance block 404c-1, the resistance block 404c-1 can no longer slide in the accommodating groove 401f after the resistance, thereby completing the locking of the locking tooth 404c-2, and then completing the fixation between the limit sleeve 301 and the socket sleeve 401a.

In summary, it is convenient for the user to adjust the position of the detection probe 500 and to adjust the distance between the detection probes 500 according to the size of the sample to be detected.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims (10)

1. A rock acoustic wave characteristic test method is characterized in that: comprising the steps of (a) a step of,

Collecting a target rock sample;

Placing a sample into an acoustic wave characteristic testing device;

Vacuumizing the sound wave characteristic testing device;

injecting carbon dioxide into the acoustic wave characteristic testing device;

Changing the pressure and temperature in the acoustic wave characteristic testing device so as to change the state of carbon dioxide;

and detecting the rock sample in real time through an ultrasonic probe in the acoustic characteristic testing device.

2. A rock acoustic wave property testing system employing the rock acoustic wave property testing method according to claim 1, characterized in that: the device comprises an acoustic wave characteristic testing device, a vacuum pump and a carbon dioxide gas cylinder, wherein the vacuum pump and the carbon dioxide gas cylinder are connected with the acoustic wave characteristic testing device, the acoustic wave characteristic testing device is connected with an oil bath, the device further comprises an acoustic wave signal transmitting device and an acoustic wave signal receiving device, the acoustic wave signal transmitting device and the acoustic wave signal receiving device are arranged on the acoustic wave characteristic testing device, and the acoustic wave signal receiving device is connected with an acoustic wave signal processing device.

3. The rock acoustic wave property testing system of claim 2, wherein: the device is characterized in that the carbon dioxide gas cylinder is connected with a booster pump, the booster pump is connected with a middle container, and the carbon dioxide gas cylinder is connected with the acoustic wave characteristic testing device through the booster pump, the middle container and the acoustic wave characteristic testing device.

4. The rock acoustic wave property testing system of claim 3, wherein: the middle container is connected with a first pressure gauge, the acoustic wave characteristic testing device is connected with a second pressure gauge, and the oil bath is connected with a thermometer.

5. Rock sound wave characteristic testing arrangement based on multistate carbon dioxide environment, its characterized in that: the rock acoustic wave characteristic testing system applied to any one of claims 2 to 4 comprises a processing chamber (100), a fixed bracket (200) fixedly arranged in the processing chamber (100), a limiting mechanism (300) fixedly arranged in the fixed bracket (200), and an installation mechanism (400) slidably arranged in the limiting mechanism (300), wherein a detection probe (500) is fixedly arranged at the end part of the installation mechanism (400);

The mounting mechanism (400) comprises a sleeving component (401) which is arranged in the limiting mechanism (300) in a sliding mode, an inserting piece (402) which is arranged in the sleeving component (401) in a sliding mode, and a connecting piece (403) which is arranged on the sleeving component (401), wherein a convex disc (405) is fixedly arranged at the end portion of the sleeving component (401);

The socket assembly (401) comprises a socket sleeve (401 a) and a slot (401 b) arranged in the socket sleeve (401 a), a groove (401 c) is formed in the outer wall of the socket sleeve (401 a), and a flat sliding groove (401 d) and a guide groove (401 e) are formed in the surface of the groove (401 c);

The insert (402) comprises a square column (402 a) which is slidably arranged on the inner wall of the slot (401 b), an adhesive disc (402 b) which is fixedly arranged at the end part of the square column (402 a), a plane (402 c) and an inclined plane (402 d) are arranged at the end part of the square column (402 a), and a curved groove (402 e) which is arranged on the surface of the square column (402 a);

the connecting piece (403) comprises a sliding rod (403 a) which is slidingly arranged in the smooth groove (401 d), a connecting rod (403 b) which is fixedly arranged at the end part of the sliding rod (403 a), and a clamping column (403 c) which is fixedly arranged at the end part of the connecting rod (403 b), wherein the end part of the clamping column (403 c) is connected with a first tension spring (403 d).

6. The rock acoustic wave characteristic testing device based on the multi-state carbon dioxide environment according to claim 5, wherein: the guide groove (401 e) comprises a parallel groove (401 e-1), a deflection groove (401 e-2) and a return groove (401 e-3) which are arranged on the groove (401 c), and two ends of the parallel groove (401 e-1) are respectively communicated with the deflection groove (401 e-2) and the return groove (401 e-3).

7. The rock acoustic wave characteristic testing device based on the multi-state carbon dioxide environment according to claim 6, wherein: the return groove (401 e-3) is provided with a push-up surface (401 e-4).

8. The rock acoustic wave characteristic testing device based on the multi-state carbon dioxide environment according to claim 7, wherein: the limiting mechanism (300) comprises a limiting sleeve (301) fixedly arranged in the fixed support (200) and a tooth slot (302) arranged on the inner wall of the limiting sleeve (301);

The sleeve joint assembly (401) further comprises a containing groove (401 f) arranged on the inner wall of the sleeve joint sleeve (401 a), and a convex strip (401 g) arranged in the containing groove (401 f), wherein a deflection surface (401 h) is arranged on the inner wall of the sleeve joint sleeve (401 a);

the mounting mechanism (400) further comprises a clamping assembly (404) arranged in the sleeving assembly (401), the clamping assembly (404) comprises a supporting shaft (404 a) fixedly arranged on the inner wall of the sleeving sleeve (401 a), a deflection piece (404 b) rotatably arranged on the outer wall of the supporting shaft (404 a), a positioning piece (404 c) slidingly arranged on the inner wall of the accommodating groove (401 f), and a second tension spring (404 d) is connected to the deflection piece (404 b);

The deflector (404 b) comprises a deflector plate (404 b-1) rotatably arranged on the outer wall of the support shaft (404 a), and an arc-shaped extrusion block (404 b-2) arranged on the deflector plate (404 b-1);

The locating piece (404 c) comprises a pushing block (404 c-1) which is arranged on the inner wall of the accommodating groove (401 f) in a sliding mode, a latch (404 c-2) which is arranged on the pushing block (404 c-1), a pushing surface (404 c-3) which is arranged on the surface of the pushing block (404 c-1) and a slope surface (404 c-4) which is arranged on the latch (404 c-2).

9. The rock acoustic wave characteristic testing device based on the multi-state carbon dioxide environment according to claim 8, wherein: the sleeving assembly (401) further comprises a notch (401 i) arranged on the accommodating groove (401 f) and a protruding part (401 j) arranged on the accommodating groove (401 f);

the deflector (404 b) further comprises a push block (404 b-3) provided on the deflector plate (404 b-1).

10. The rock acoustic wave characteristic testing device based on a multi-state carbon dioxide environment according to any one of claims 5 to 9, wherein: the processing chamber (100) comprises a box body (101), a conveying pipeline (102) arranged on the box body (101) and a sealing cover plate (103) arranged on the box body (101).