CN112943371A - Controlled Shock Wave Coal Seam Enhanced Permeability Evaluation System - Google Patents
Controlled Shock Wave Coal Seam Enhanced Permeability Evaluation System Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 89
- 230000035939 shock Effects 0.000 title claims abstract description 68
- 230000035699 permeability Effects 0.000 title claims abstract description 41
- 238000011156 evaluation Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000004088 simulation Methods 0.000 claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims description 32
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- 239000007788 liquid Substances 0.000 claims description 10
- 230000001965 increasing effect Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 7
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 7
- 230000006872 improvement Effects 0.000 claims description 7
- 229920002530 polyetherether ketone Polymers 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 12
- 230000003487 anti-permeability effect Effects 0.000 abstract 2
- 238000010191 image analysis Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 41
- 238000000034 method Methods 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 230000008569 process Effects 0.000 description 10
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- 238000003860 storage Methods 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
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Abstract
本发明提供一种可控冲击波煤层增透评价系统，包括原位环境模拟子系统、可控冲击波发生子系统、扫描子系统、气体注入子系统及数据采集分析子系统；原位环境模拟子系统用于提供预设的温度压力模拟环境；可控冲击波发生子系统包括控制器及可控冲击波发生器；扫描子系统包括发射器及接收器；气体注入子系统包括气体注入泵、气体管路及流量计；数据采集分析子系统用于根据气体流量及扫描图像分析测试煤样的渗透率和内部裂隙结构变化。本发明可以确定可控冲击波实验对煤样内部裂隙结构及渗透率的影响，得到模拟原位条件下可控冲击波的煤层增透效果评价结果，上述观测过程无需将测试煤样卸压取出，裂隙及渗透率演化特征观测结果更加准确。
The invention provides a controllable shock wave coal seam anti-permeability evaluation system, comprising an in-situ environment simulation subsystem, a controllable shock wave generation subsystem, a scanning subsystem, a gas injection subsystem and a data acquisition and analysis subsystem; an in-situ environment simulation subsystem It is used to provide a preset temperature and pressure simulation environment; the controllable shock wave generation subsystem includes a controller and a controllable shock wave generator; the scanning subsystem includes a transmitter and a receiver; the gas injection subsystem includes a gas injection pump, a gas pipeline and Flow meter; data acquisition and analysis subsystem is used to analyze and test the permeability and internal fracture structure changes of coal samples according to gas flow and scanning image analysis. The invention can determine the influence of the controllable shock wave experiment on the internal fracture structure and permeability of the coal sample, and obtain the evaluation result of the anti-permeability effect of the coal seam by simulating the controllable shock wave under the in-situ condition. And the observation results of permeability evolution characteristics are more accurate.
Description
Technical Field
The invention relates to the technical field of coal seam permeability improvement, in particular to a controllable shock wave coal seam permeability improvement evaluation system.
Background
In order to ensure the safe production of coal mines, gas is usually pre-pumped through drilling, but the direct pre-pumping effect is not ideal for high-gas coal seams with low air permeability, so that various coal seam permeability increasing methods are produced to improve the air permeability of the coal seams.
The controllable shock wave technology is used as a novel coal bed permeability increasing technology, related industrial tests are carried out on a mine field at present, but the research on crack propagation mechanism of coal body in the controllable shock wave action process, especially on the change of fracture morphology in the coal body under the condition of multiple actions is less. At present, due to the limitation of experimental conditions, a laboratory still needs to relieve pressure and take out a test piece for observation, scanning is carried out under an X-ray machine, a coal body generates new cracks in the process of unloading volume stress, and the shape of the original cracks such as opening degree, length and the like is changed, so that the taken-out coal body test piece cannot reflect the change of the cracks and the permeability characteristics of the coal body under the original rock stress condition.
Disclosure of Invention
The invention solves the problem that the existing coal body test piece needs to be taken out after pressure relief and observed, so that the observation result of the fracture and permeability characteristics is inaccurate.
In order to solve the problems, the invention provides a controllable shock wave coal seam permeability increasing evaluation system which comprises an in-situ environment simulation subsystem, a controllable shock wave generation subsystem, a scanning subsystem, a gas injection subsystem and a data acquisition and analysis subsystem; the in-situ environment simulation subsystem comprises a clamp holder, a shaft pressure control device, a confining pressure control device and a temperature control device; the in-situ environment simulation subsystem is used for providing a preset temperature and pressure simulation environment; the holder is used for accommodating a test coal sample; the controllable shock wave generation subsystem comprises a controller and a controllable shock wave generator, and the controllable shock wave generator is arranged in the clamp holder; the scanning subsystem comprises a transmitter and a receiver, and the transmitter and the receiver are oppositely arranged on two sides of the clamper; the gas injection subsystem comprises a gas injection pump, a gas pipeline and a flowmeter, the gas pipeline is communicated with the gas injection pump, the clamper and the external space, and the flowmeter is arranged in the gas pipeline; and the data acquisition and analysis subsystem is connected with the receiver and the flowmeter and is used for analyzing the permeability and the internal fracture structure change of the test coal sample according to the gas flow and the scanning image.
Optionally, the holder includes a rubber sleeve, a hydraulic top plate, a hydraulic bottom plate and a housing, and the rubber sleeve is disposed in a space enclosed by the hydraulic top plate, the hydraulic bottom plate and the housing; the rubber sleeve is used for containing the test coal sample.
Optionally, the housing is made of a polyetheretherketone material, and/or the rubber sleeve is made of nitrile rubber.
Optionally, the distance between the outer wall of the rubber sleeve and the inner wall of the shell is 4-6mm, and/or the thickness of the shell is 8-12 mm.
Optionally, the axle pressure control device comprises a first hydraulic line connected to the hydraulic top plate and the hydraulic bottom plate; the confining pressure control device comprises a second hydraulic pipeline, and the second hydraulic pipeline is connected to the rubber sleeve and the space between the shells.
Optionally, the pressure fluid in the second hydraulic line is deionized water.
Optionally, the temperature control device is disposed in the second hydraulic line, and is configured to heat the pressure fluid in the second hydraulic line.
Optionally, the in-situ environment simulation subsystem further comprises a turntable, and the clamper is arranged on the turntable.
Optionally, the transmitter is an X-ray machine, and the receiver is an X-ray receiver.
Optionally, the preset temperature and pressure simulation environment has an axial pressure and a confining pressure both greater than 25MPa and a temperature greater than 70 ℃.
The controllable shock wave coal seam permeability-increasing evaluation system provided by the embodiment of the invention can perform a controllable shock wave experiment on a test coal sample in a simulated coal seam in-situ environment, scan the test coal sample through the transmitter and the receiver, determine the influence of the controllable shock wave experiment on an internal fracture structure, and determine the influence of the controllable shock wave experiment on permeability through gas flow information acquired by the flowmeter, so as to obtain a coal seam permeability-increasing effect evaluation result of the controllable shock wave under the simulated in-situ condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural flow chart of a controllable shock wave coal seam permeability increase evaluation system in an embodiment of the invention.
Description of reference numerals:
11-a gripper; 111-rubber sleeve; 112-testing the coal sample; 12-axial pressure control means; 13-confining pressure control device; 14-a temperature control device; 15-a numerical control turntable; 21-a controller; 22-a controllable shock wave generator; 31-X-ray machine; 32-an X-ray receiver; 41-gas injection pump; 42-gas line; 43-nitrogen flow meter; 421-gas injection valve; 422-outlet valve; 423-gas pressure sensor; 44-nitrogen source; 50-data collection and analysis system.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment provides a controllable shock wave coal seam permeability increasing evaluation system which comprises an in-situ environment simulation subsystem, a controllable shock wave generation subsystem, a scanning subsystem and a data acquisition and analysis subsystem.
The in-situ environment simulation subsystem is used for providing a preset temperature and pressure simulation environment and comprises a clamp holder, a shaft pressure control device, a confining pressure control device and a temperature control device. The holder is used for accommodating a test coal sample. Specifically, the clamp holder can comprise a rubber sleeve, a hydraulic top plate, a hydraulic bottom plate and a shell, wherein the rubber sleeve is arranged in a space defined by the hydraulic top plate, the hydraulic bottom plate and the shell. The temperature and pressure simulation environment provided by the in-situ environment simulation subsystem has the axial pressure and confining pressure of more than 25MPa and the temperature of more than 70 ℃.
The shell is cylindrical, an opening at the upper side of the shell is covered by the hydraulic top plate, an opening at the lower side of the shell is covered by the hydraulic bottom plate, the shell, the hydraulic top plate and the hydraulic bottom plate form a closed space, the rubber sleeve is arranged in the closed space, and the testing coal sample can be contained in the rubber sleeve. The axial pressure control device provides hydraulic power for the hydraulic top plate and the hydraulic bottom plate to apply axial pressure to the test coal sample, and the confining pressure control device injects pressure liquid into a space between the shell and the rubber sleeve to apply circumferential pressure to the rubber sleeve, so that the in-situ environment of the coal bed under natural conditions is simulated. Wherein, the gum cover can keep apart pressure fluid and test coal sample.
The controllable shock wave generation subsystem comprises a controller and a controllable shock wave generator, and the controllable shock wave generator is arranged in the clamp holder. After the clamp holder is filled with the test coal sample, the controllable shock wave generator is positioned at the center of the test coal sample. A user can control the controllable shock wave generator to start through the controller, and the controllable shock wave experiment is carried out on the test coal sample. It can be understood that a user can control to perform multiple controllable shock wave experiments to observe the influence of different times of controllable shock waves on the permeability and the internal fracture structure of the test coal sample.
The scanning subsystem may include an emitter and a receiver disposed opposite each other on opposite sides of the holder. Scanning rays, sound waves and the like are transmitted by the transmitter and received by the receiver, and the internal fracture of the tested coal sample before controllable impact and the internal fracture after controllable impact can be obtained through the received scanning result. The transmitter can transmit X-ray beam, gamma ray, ultrasonic wave, etc. and together with the receiver with very high sensitivity makes section scan around the measured object one by one.
The gas injection subsystem comprises a gas injection pump, a gas pipeline and a flowmeter, wherein the gas pipeline is communicated with the gas injection pump, the clamp holder and the external space, and the flowmeter is arranged in the gas pipeline. The gas injection pump can inject gas such as nitrogen into the test coal sample of the clamp holder, and the permeability of the test coal sample can be calculated through flow data acquired by the flowmeter.
The data acquisition and analysis subsystem is connected with the receiver and the flowmeter, can receive the gas flow acquired by the flowmeter and the scanning image acquired by the receiver, and analyzes and tests the permeability and the internal fracture structure change of the coal sample according to the gas flow and the scanning image.
The controllable shock wave coal seam permeability-increasing evaluation system provided by this embodiment can perform a controllable shock wave experiment on a test coal sample in a simulated coal seam in-situ environment, scan the test coal sample through a transmitter and a receiver, determine the influence of the controllable shock wave experiment on an internal fracture structure, and determine the influence of the controllable shock wave experiment on permeability through gas flow information acquired by a flowmeter, so as to obtain a coal seam permeability-increasing effect evaluation result of the controllable shock wave under the simulated in-situ condition.
In order to ensure that a clear scanning result of a tested coal sample is obtained and the absorption of a scanning light by an in-situ environment simulation system is reduced to the greatest extent, the shell is made of a polyether-ether-ketone (PEEK) material and/or the rubber sleeve is made of nitrile rubber.
The PEEK material has the characteristics of high mechanical strength, high temperature resistance and the like, can penetrate X rays, does not generate artifacts in CT (Computed Tomography) scanning, and does not generate interference on the scanning result of a test coal sample. The thickness of the shell is 8-12 mm. For example, PEEK with the wall thickness of 10mm is selected as the shell of the in-situ environment simulation system, so that the in-situ environment simulation system can bear the environment with the pressure of 25MPa and the temperature and the pressure of 70 ℃.
The rubber sleeve is made of nitrile rubber, and the nitrile rubber has good heat resistance and air tightness and has the density of about 1.25g/cm3, so that the nitrile rubber can be well distinguished from the test coal sample in the CT scanning result.
The distance between the outer wall of the rubber sleeve and the inner wall of the shell can be 4-6 mm. For example, the outer wall of the rubber sleeve is 5mm away from the inner wall of the shell of the in-situ environment simulation system, so that pressure liquid provided by the confining pressure control device can fully enter the in-situ environment simulation system to apply confining pressure, the distance from a transmitter (such as an X-ray machine) to a test coal sample can be reduced as much as possible, and the CT magnification factor is increased.
Optionally, the axial pressure control device includes a first hydraulic line, and the first hydraulic line is connected to the hydraulic top plate and the hydraulic bottom plate and is used for providing hydraulic power to the hydraulic top plate and the hydraulic bottom plate so as to apply axial pressure to the test coal sample; the confining pressure control device comprises a second hydraulic pipeline, wherein the second hydraulic pipeline is connected to a space between the rubber sleeve and the shell and is used for injecting pressure liquid into the space between the shell and the rubber sleeve so as to apply circumferential pressure to the rubber sleeve.
The pressure liquid in the second hydraulic pipeline is deionized water. Deionized water is used as pressure liquid and filled between the rubber sleeve and the shell of the in-situ environment simulation system, so that the absorption of impurities in water to X-rays can be reduced to the maximum extent, and the CT scanning effect is ensured.
Optionally, the temperature control device is disposed in the second hydraulic line, and is configured to heat the pressure fluid in the second hydraulic line. Heating of the test coal sample can be performed without affecting the operation of the emitter.
Optionally, the in-situ environment simulation subsystem further includes a turntable, and the clamper is disposed on the turntable. In the operation process of the scanning subsystem, the turntable rotates to drive the clamp holder and the test coal sample therein to rotate, the receiver can acquire the scanning results of a plurality of axial sections of the test coal sample, and the scanning results of the test coal sample can be obtained after splicing. Illustratively, the turntable rotates at a speed of 10 ° every 2s, and after a 360 ° rotation, the receiver can obtain a plurality of scanning images.
Optionally, the transmitter is an X-ray machine, and the receiver is an X-ray receiver.
Fig. 1 is a structural flow chart of a controllable shock wave coal seam permeability improvement evaluation system in an embodiment of the present invention, and shows that the system includes an in-situ environment simulation subsystem, a controllable shock wave generation subsystem, a scanning subsystem, a gas injection subsystem, and a data acquisition and analysis subsystem.
The in-situ environment simulation subsystem comprises a clamper 11, a shaft pressure control device 12, a confining pressure control device 13 and a temperature control device 14. The controllable shock wave generating subsystem comprises a controller 21 and a controllable shock wave generator 22. A controllable shock wave generator 22 is in the holder 11.
The scanning subsystem includes an X-ray machine 31 and an X-ray receiver 32.
The gas injection subsystem includes a gas injection pump 41, a gas line 42, and a nitrogen gas flow meter 43, and a gas injection valve 421, an outlet valve 422, and a gas pressure sensor 423 are provided on the gas line 42. In the present embodiment, the gas is nitrogen, and the gas injection subsystem further includes a nitrogen gas source 44. The holder 11 is further provided with a rubber sleeve 111, the rubber sleeve 111 accommodates a test coal sample 112, and a numerical control turntable 15 is provided below the holder 11.
The experimental process of the controllable shock wave coal seam permeability increasing evaluation system is described in detail below.
(1) The controllable shock wave generator 22 is arranged in the test coal sample 112, the test coal sample 112 is arranged in the rubber sleeve 111 of the in-situ environment simulation subsystem, and then the in-situ environment simulation system is arranged on the numerical control rotary table 15.
(2) And connecting the in-situ environment simulation system with a gas injection pump 41, a temperature control device 14, a shaft pressure control device 12, a confining pressure control device 13 and a nitrogen flowmeter 43, and detecting the air tightness of the system.
(3) And starting the temperature control device 14, the axle pressure control device 12 and the confining pressure control device 13, so that the temperature and the pressure in the in-situ environment simulation system reach the experiment set values.
(4) The nitrogen gas source 44, the gas injection pump 41, the gas injection valve 421, and the outlet valve 422 are sequentially opened to set the gas pressure to inject nitrogen gas into the test coal sample 112. After the nitrogen flow meter 43 shows a flow stabilization for more than 2 hours, the permeability of the test coal sample 112 is determined. The nitrogen gas source 44, the gas injection pump 41, and the gas injection valve 421 are then sequentially turned off.
(5) The X-ray machine 31, the X-ray receiver 32, the numerical control rotary table 15 and the data acquisition and analysis system 50 are started to scan the test coal sample 112, the X-ray machine 31, the X-ray receiver 32 and the numerical control rotary table 15 are closed after the scanning is finished, and the data acquisition and analysis system 50 processes and analyzes the scanned data to obtain a CT scanning image of the test coal sample 112.
(6) And starting the controllable shock wave generator 22 to perform a controllable shock wave experiment on the test coal sample 112.
(7) And (5) repeating the steps (4) to (5) to obtain the permeability and the internal fracture structure change of the test coal sample 112 after the controllable shock wave experiment is carried out for one time.
(8) And (5) repeating the steps (6) - (7) according to the experimental frequency of the controllable shock wave, so as to obtain the permeability and the internal fracture structure change of the test coal sample 112 under the action of the controllable shock wave with different frequencies.
The in-situ environment simulation system of the embodiment can provide a temperature and pressure simulation environment with the test piece size of phi 50 multiplied by 100mm, the axial pressure and the confining pressure respectively reaching 25MPa, and the environment temperature reaching 70 ℃.
In order to ensure that a clear CT image of a test coal sample is obtained and the absorption of a shell of the in-situ environment simulation system and confining pressure liquid to X rays is reduced to the maximum extent, the following innovative technologies are adopted:
(1) the shell of the in-situ environment simulation system is made of PEEK material, and the wall thickness is 10 mm; (2) the rubber sleeve wrapped by the coal sample to be tested is made of nitrile butadiene rubber, and the wall thickness is 3 mm; (3) the outer wall of the rubber sleeve is 5mm away from the inner wall of the shell of the in-situ environment simulation system; (4) the confining pressure control device adopts deionized water as pressure liquid.
The confining pressure control device consists of an injection pump and a pumping pump, and the injected pressure liquid is heated by the temperature control device, so that the heating of the coal sample is tested under the condition that the X-ray machine is not influenced.
And testing the permeability test and CT scanning of the coal sample after the controllable shock wave operation for different times, so that the evolution rule and permeability change of the internal fracture of the coal body after the action of the controllable shock wave for multiple times can be obtained, the evaluation of the permeability increasing effect of the controllable shock wave coal bed under the simulated in-situ condition is realized, and the optimal controllable shock wave operation times are obtained.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A controllable shock wave coal seam permeability increasing evaluation system is characterized by comprising an in-situ environment simulation subsystem, a controllable shock wave generation subsystem, a scanning subsystem, a gas injection subsystem and a data acquisition and analysis subsystem;
the in-situ environment simulation subsystem comprises a clamp holder, a shaft pressure control device, a confining pressure control device and a temperature control device; the in-situ environment simulation subsystem is used for providing a preset temperature and pressure simulation environment; the holder is used for accommodating a test coal sample;
the controllable shock wave generation subsystem comprises a controller and a controllable shock wave generator, and the controllable shock wave generator is arranged in the clamp holder;
the scanning subsystem comprises a transmitter and a receiver, and the transmitter and the receiver are oppositely arranged on two sides of the clamper;
the gas injection subsystem comprises a gas injection pump, a gas pipeline and a flowmeter, the gas pipeline is communicated with the gas injection pump, the clamper and the external space, and the flowmeter is arranged in the gas pipeline;
and the data acquisition and analysis subsystem is connected with the receiver and the flowmeter and is used for analyzing the permeability and the internal fracture structure change of the test coal sample according to the gas flow and the scanning image.
2. The system for evaluating coal bed permeability increase of controlled shock waves according to claim 1,
the clamp holder comprises a rubber sleeve, a hydraulic top plate, a hydraulic bottom plate and a shell, wherein the rubber sleeve is arranged in a space defined by the hydraulic top plate, the hydraulic bottom plate and the shell;
the rubber sleeve is used for containing the test coal sample.
3. The system for evaluating coal seam permeability improvement of controllable shock waves of claim 2,
the shell is made of a polyether-ether-ketone material, and/or the rubber sleeve is made of nitrile rubber.
4. The system for evaluating the permeability of coal seams with controllable shock waves of claim 2 or 3,
the distance between the outer wall of the rubber sleeve and the inner wall of the shell is 4-6mm, and/or the thickness of the shell is 8-12 mm.
5. The system for evaluating coal seam permeability improvement of controllable shock waves of claim 2,
the axle pressure control device comprises a first hydraulic pipeline which is connected to the hydraulic top plate and the hydraulic bottom plate;
the confining pressure control device comprises a second hydraulic pipeline, and the second hydraulic pipeline is connected to the rubber sleeve and the space between the shells.
6. The system for evaluating coal seam permeability improvement of controllable shock waves of claim 5,
and the pressure liquid in the second hydraulic pipeline is deionized water.
7. The system for evaluating coal seam permeability improvement of controllable shock waves of claim 5,
the temperature control device is arranged on the second hydraulic pipeline and used for heating the pressure liquid in the second hydraulic pipeline.
8. The system for evaluating coal bed permeability increase of controlled shock waves according to claim 1,
the in-situ environment simulation subsystem further comprises a rotary table, and the clamp holder is arranged on the rotary table.
9. The system for evaluating coal bed permeability increase of controlled shock waves according to claim 1,
the transmitter is an X-ray machine, and the receiver is an X-ray receiver.
10. The system for evaluating coal bed permeability increase of controlled shock waves according to claim 1,
the axial pressure and confining pressure of the preset temperature and pressure simulation environment are both greater than 25MPa, and the temperature is greater than 70 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110099452.XA CN112943371A (en) | 2021-01-25 | 2021-01-25 | Controlled Shock Wave Coal Seam Enhanced Permeability Evaluation System |
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| CN202110099452.XA CN112943371A (en) | 2021-01-25 | 2021-01-25 | Controlled Shock Wave Coal Seam Enhanced Permeability Evaluation System |
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| Publication number | Priority date | Publication date | Assignee | Title |
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