Coal bed gas reservoir stress sensitivity test platform

Abstract

The invention relates to the technical field of coalbed methane reservoir stress, in particular to a coalbed methane reservoir stress sensitivity test platform which comprises a shell, the shell is filled with pulverized coal, the shell is communicated with a discharge pipe and a conducting pipe, the discharge pipe is provided with a flow meter, the conducting pipe is communicated with a connecting hose, and the connecting hose is connected with the flow meter. The device comprises a connecting hose, a connecting sleeve is arranged on the connecting hose in a communicating mode, a one-way valve is arranged on the connecting sleeve, the connecting sleeve is connected with a plurality of connecting hard pipes through a sealing mechanism, storage tanks are arranged on the connecting hard pipes in a communicating mode, and the storage tanks are adjusted through a horizontal adjusting mechanism. Pressurizing pumps are arranged on the plurality of connecting hard pipes; a plurality of pressurizing devices are arranged in the shell, and a heating device is fixedly connected to the bottom wall of the shell. According to the invention, the accuracy of a test result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane reservoir stress, and in particular to a coalbed methane reservoir stress sensitivity test platform. Background Art

[0002] The stress sensitivity of coalbed methane reservoirs refers to the phenomenon that the physical and chemical properties of the reservoirs change when they are subjected to external stress (such as crustal movement, mining activities, etc.). The coalbed methane reservoir stress sensitivity test platform is an experimental device used to study the response characteristics of coalbed methane reservoirs under stress changes. Generally, during the test, high-pressure methane gas, water, and weak acid are injected through the injection path in a closed space, and the stable flow rate is measured by the flow meter on the discharge pipe; the data of several flow rates are compared and analyzed. In this way, the stress sensitivity of the coalbed methane reservoir is tested. However, since the pipelines of high-pressure methane gas, water, and weak acid are interconnected, it is easy to cause the last material to remain in the branch part of the pipeline during injection, resulting in the next injection. The residual material from the last time will be mixed, thus affecting the accuracy of the test results. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art that the next injection will be mixed with the residual materials from the previous time, thereby affecting the accuracy of the test results, and to propose a coalbed methane reservoir stress sensitivity test platform.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A coalbed methane reservoir stress sensitivity test platform is designed, comprising a shell, the shell is filled with coal powder, a discharge pipe and a conducting pipe are connected on the shell, a flow meter is arranged on the discharge pipe, a connecting hose is connected on the conducting pipe, a connecting sleeve is connected on the connecting hose, a one-way valve is arranged on the connecting sleeve, the connecting sleeve is respectively connected with a plurality of connecting hard pipes through a sealing mechanism, a plurality of connecting hard pipes are connected with storage tanks, a plurality of storage tanks are adjusted by a horizontal adjustment mechanism, and a plurality of connecting hard pipes are provided with a pressure pump; A plurality of pressurizing devices are arranged in the shell, and a heating device is fixedly connected to the bottom wall of the shell.

[0005] Preferably, a concentration sensor and a pressure sensor are fixedly connected to the top wall of the shell.

[0006] Preferably, the sealing mechanism includes a telescopic rod, a connecting block is fixedly connected to the telescopic rod, the connecting block is fixedly connected to the connecting sleeve, an abutment ring is fixedly connected to the connecting rigid tube, a sealing ring is fixedly connected to the lower end of the abutment ring, the connecting rigid tube extends into the connecting sleeve, and the sealing ring abuts against the connecting sleeve.

[0007] Preferably, a rotating shaft is rotatably connected to the housing via a bearing, an abutment block is fixedly connected to the rotating shaft, and the abutment block abuts against the abutment ring.

[0008] Preferably, the bearing is a thrust ball bearing.

[0009] Preferably, the horizontal adjustment mechanism includes a base, a motor is fixedly connected to the base, a support platform is fixedly connected to the output shaft of the motor, a plurality of limit rings are fixedly connected to the support platform at equal distances around the circumference, the storage tank is placed in the plurality of limit rings, two support legs are fixedly connected to the support platform, sliders are fixedly connected to the two support legs, guide grooves are provided on the two sliders, a slide rail is fixedly connected to the base, the slide rail has a circular ring structure, and the slide rail is located in the guide groove.

[0010] Preferably, the shell is made of transparent material.

[0011] The invention proposes a coalbed methane reservoir stress sensitivity test platform, which has the beneficial effect of rotating a plurality of connecting hard pipes through a horizontal adjustment mechanism, so that when connecting, only one connecting hard pipe is connected to the connecting sleeve, thereby avoiding the generation of branch pipes, preventing the last injected material from remaining in the branch pipe, and avoiding the last residual material from interfering with the next injected material, thereby ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a coalbed methane reservoir stress sensitivity test platform proposed by the present invention; Figure 2 A three-dimensional cross-sectional view of a coalbed methane reservoir stress sensitivity test platform proposed by the present invention; Figure 3 A coalbed methane reservoir stress sensitivity test platform proposed by the present invention Figure 2 A front view of Figure 4 A stress sensitivity test of coalbed methane reservoir proposed in the present invention Figure 1 Enlarged view of part A.

[0013] In the figure: 1. Shell; 2. Base; 3. Storage tank; 4. Connecting hard pipe; 5. Abutment ring; 6. Pressure pump; 7. Battery; 8. Support table; 9. Support leg; 10. Slider; 11. Discharge pipe; 12. Flow meter; 13. Telescopic rod; 14. Connecting block; 15. Conducting pipe; 16. Connecting hose; 17. Rotating shaft; 18. Abutment block; 19. Connecting sleeve; 20. Motor; 21. Pressurizing device; 22. Concentration sensor; 23. Pressure sensor; 24. Heating device. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] Example 1: Reference Figure 1-4 A coalbed methane reservoir stress sensitivity test platform comprises a shell 1, the shell 1 is filled with coal powder, the coal powder forms a coal seam, a discharge pipe 11 and a conducting pipe 15 are connected on the shell 1, a flow meter 12 is arranged on the discharge pipe 11, a valve is arranged on the discharge pipe 11, a connecting hose 16 is connected on the conducting pipe 15, a connecting sleeve 19 is connected on the connecting hose 16, a one-way valve is arranged on the connecting sleeve 19, the connecting sleeve 19 is respectively connected with a plurality of connecting hard pipes 4 through a sealing mechanism, the plurality of connecting hard pipes 4 are connected with a storage tank 3, and the plurality of storage tanks 3 are connected on the connecting sleeve 19. The storage tank 3 is adjusted by a horizontal adjustment mechanism, and a plurality of connecting hard pipes 4 are each provided with a booster pump 6. The storage tank 3 is respectively filled with methane, water and weak acid so as to simulate an actual mineral coalbed methane reservoir in the shell 1. The plurality of connecting hard pipes 4 are rotated by the horizontal adjustment mechanism, so that when connecting, only one connecting hard pipe 4 is connected to the connecting sleeve 19, thereby avoiding the generation of branch pipelines, preventing the last injected material from remaining in the branch pipeline, and avoiding the last residual material from interfering with the next injected material, thereby ensuring the accuracy of the test results.

[0016] A plurality of pressurizing devices 21 are arranged in the shell 1. The pressurizing devices 21 are used to apply pressure to the coal seam. A heating device 24 is fixedly connected to the bottom wall of the shell 1. The heating device 24 plays a heating role. The heating method adopted is slow heating. According to the pressure conditions and temperature conditions of the actual mineral coalbed methane reservoir, sampling of the actual mineral coalbed methane reservoir is carried out. A simulated mineral coalbed methane reservoir is set in the space of the experimental platform, and then the experimental space is closed. The environmental conditions in the experimental platform space are made the same as those of the actual mineral through the pressurizing device 21, the heating device 24 and the exhaust pipe 7. Then, the stress of the coalbed methane reservoir is simulated by controlling and adjusting the pressure. The results are obtained by conducting experiments and tests under different stresses.

[0017] A concentration sensor 22 and a pressure sensor 23 are fixedly connected to the top wall of the shell 1. The concentration sensor 22 is used to detect the concentration of methane, and the pressure sensor 23 is used to detect the applied pressure.

[0018] The sealing mechanism includes a telescopic rod 13, to which a connecting block 14 is fixedly connected, and the connecting block 14 is fixedly connected to a connecting sleeve 19. A connecting ring 5 is fixedly connected to a connecting hard pipe 4, and a sealing ring is fixedly connected to the lower end of the abutment ring 5. The connecting hard pipe 4 extends into the connecting sleeve 19, and the sealing ring abuts against the connecting sleeve 19. By extending the telescopic rod 13, the sealing ring abuts against the connecting sleeve 19, which plays a sealing role, so that no leakage will occur when the connecting hard pipe 4 is connected to the connecting sleeve 19.

[0019] Example 2: Reference Figure 1-4 As another preferred embodiment of the present invention, on the basis of embodiment 1, a rotating shaft 17 is rotatably connected to the housing 1 through a bearing, and an abutment block 18 is fixedly connected to the rotating shaft 17, and the abutment block 18 abuts against the abutment ring 5. The bearing is a thrust ball bearing. When the telescopic rod 13 is extended, a force will be applied to the connecting hard pipe 4. The abutment block 18 is used to offset the force applied to the connecting hard pipe 4, thereby preventing the connection between the connecting hard pipe 4 and the storage tank 3 from being affected.

[0020] Example 3: Reference Figure 1-4 As another preferred embodiment of the present invention, on the basis of embodiment 2, the horizontal adjustment mechanism includes a base 2, a motor 20 is fixedly connected to the base 2, a support platform 8 is fixedly connected to the output shaft of the motor 20, a battery 7 is installed on the support platform 8, and the battery 7 is used to power the booster pump. A plurality of limit rings are fixedly connected to the support platform 8 at equal distances on the circumference, and storage tanks 3 are placed in the plurality of limit rings. Two support legs 9 are fixedly connected to the support platform 8, and sliders 10 are fixedly connected to the two support legs 9. Guide grooves are provided on the two sliders 10. A slide rail is fixedly connected to the base 2, and the slide rail is a circular ring structure. The slide rail is located in the guide groove. By using the motor 20 to rotate, the support platform 8 will be driven to rotate, thereby driving the plurality of storage tanks 3 to rotate, so that the storage tanks 3 stored in different positions can be connected to the connecting sleeve 19. At the same time, when the support platform 8 rotates, the slider 10 slides on the slide rail to support the support platform 8, thereby avoiding the use of the motor 20 for support.

[0021] Example 4: Reference Figure 1-3 As another preferred embodiment of the present invention, based on Embodiment 3, the housing 1 is made of a transparent material, and the transparent material may be vacuum glass.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coalbed methane reservoir stress sensitivity test platform, comprising a shell (1), characterized in that: The shell (1) is filled with coal powder. A discharge pipe (11) and a conducting pipe (15) are connected to the shell (1). A flow meter (12) is provided on the discharge pipe (11). A connecting hose (16) is connected to the conducting pipe (15). A connecting sleeve (19) is connected to the connecting hose (16). A one-way valve is provided on the connecting sleeve (19). The connecting sleeve (19) is respectively connected to a plurality of connecting hard pipes (4) via a sealing mechanism. The plurality of connecting hard pipes (4) are connected to a storage tank (3). The plurality of storage tanks (3) are adjusted via a level adjustment mechanism. A pressure pump (6) is provided on the plurality of connecting hard pipes (4). A plurality of pressurizing devices (21) are arranged in the shell (1), and a heating device (24) is fixedly connected to the bottom wall of the shell (1).

2. A coalbed methane reservoir stress sensitivity test platform according to claim 1, characterized in that: A concentration sensor (22) and a pressure sensor (23) are fixedly connected to the top wall of the housing (1).

3. A coalbed methane reservoir stress sensitivity test platform according to claim 1, characterized in that: The sealing mechanism comprises a telescopic rod (13), a connecting block (14) is fixedly connected to the telescopic rod (13), the connecting block (14) is fixedly connected to the connecting sleeve (19), an abutment ring (5) is fixedly connected to the connecting hard pipe (4), a sealing ring is fixedly connected to the lower end of the abutment ring (5), the connecting hard pipe (4) extends into the connecting sleeve (19), and the sealing ring abuts against the connecting sleeve (19).

4. A coalbed methane reservoir stress sensitivity test platform according to claim 3, characterized in that: The housing (1) is rotatably connected to a rotating shaft (17) via a bearing, and an abutment block (18) is fixedly connected to the rotating shaft (17), wherein the abutment block (18) abuts against the abutment ring (5).

5. A coalbed methane reservoir stress sensitivity test platform according to claim 4, characterized in that: The bearing is a thrust ball bearing.

6. A coalbed methane reservoir stress sensitivity test platform according to any one of claims 1 to 5, characterized in that: The horizontal adjustment mechanism comprises a base (2), a motor (20) is fixedly connected to the base (2), a support platform (8) is fixedly connected to the output shaft of the motor (20), a plurality of limit rings are fixedly connected to the support platform (8) at equal distances on the circumference, the storage tank (3) is placed in the plurality of limit rings, two support legs (9) are fixedly connected to the support platform (8), both of the two support legs (9) are fixedly connected to a slider (10), both of the two sliders (10) are provided with a guide groove, and a slide rail is fixedly connected to the base (2), the slide rail is a circular ring structure, and the slide rail is located in the guide groove.

7. A coalbed methane reservoir stress sensitivity test platform according to claim 6, characterized in that: The shell (1) is made of transparent material.

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