Shale gas and coal bed gas content testing device

Abstract

The utility model discloses a shale gas and coal bed gas content testing device which comprises a tank main body, a vibration assembly, a gas suction assembly and a clamping assembly, a feeding port is fixedly connected to one side of the tank body, an electric heating plate is fixedly connected to the interior of the tank body, a damping rod is fixedly connected to the top of a supporting base, a spring is wound around the damping rod, an electromagnet is fixedly connected to the top of the supporting base, and a permanent magnet is fixedly connected to the bottom of a placing plate. Through the structure, high-frequency vibration is alternately driven through the magnetic poles of the electromagnet and the permanent magnet, meanwhile, the suction pump is matched for vacuumizing, residual gas in the tank is efficiently cleared away, interference to a detection result is avoided, after vacuumizing, materials are put into the tank, high-frequency vibration continues to be applied to compact a sample, and the compaction state of underground rock is simulated; the compactness of the sample is close to the confining pressure of the reservoir, so that the occurrence state of the adsorbed gas meets the actual formation condition.

Description

Technical Field

[0001] This utility model relates to the field of shale gas exploration technology, and in particular to a device for testing the gas content of shale gas and coalbed methane. Background Technology

[0002] Shale gas is a type of natural gas stored in shale formations, primarily found in dark mudstone or carbonaceous mudstone shale formations. It exists in both adsorbed and free forms within mudstone, carbonaceous mudstone, shale, and their silty interlayers. For example, a Chinese patent discloses a shale gas reservoir gas content testing device (application number: 202420660713.X). While this device utilizes first, second, and third filters with varying mesh densities and regular shapes to facilitate layer-by-layer filtration of residual gas, improving the filtration of fine particles, dust, and impurities and ensuring a pure residual gas volume, it lacks a vacuum pretreatment step during gas content detection. The failure to evacuate the testing container results in a mixture of residual air and target gas within the container, potentially causing errors in gas volume measurement, affecting the accuracy of component analysis, and ultimately reducing the reliability of the test results. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a shale gas and coalbed methane gas content testing device. It uses the alternating magnetic poles of an electromagnet and a permanent magnet to drive high-frequency vibration, while simultaneously using a suction pump to evacuate the tank, efficiently removing residual gas in the tank and avoiding interference with the test results. After evacuation, the material is placed in the tank, and high-frequency vibration is continued to be applied to compact the sample, simulating the compaction state of underground rock, so that the sample density is close to the reservoir confining pressure, thereby ensuring that the occurrence state of adsorbed gas conforms to the actual formation conditions.

[0004] This utility model also provides a shale gas and coalbed methane gas content testing device, comprising: a tank body, a vibration assembly, a suction assembly, and a clamping assembly; a feed inlet is fixedly connected to one side of the tank body, and an electric heating plate is fixedly connected inside the tank body; the suction assembly includes a gas collecting tank, a suction pump is fixedly connected to the top of the gas collecting tank, a gas outlet pipe is fixedly connected to one side of the suction pump, and a gas collecting pipe is fixedly connected to the top of the suction pump, the gas collecting pipe being fixedly connected to the tank body; the vibration assembly includes a support base, and a clamping assembly is fixedly connected to one side of the top of the support base. A supporting plate is fixedly connected to the base, and a guide rod is fixedly connected inside the supporting plate. A placement plate is slidably connected to the outside of the guide rod. A damping rod is fixedly connected to the top of the supporting base, and a spring is wound around the damping rod. An electromagnet is fixedly connected to the top of the supporting base, and a permanent magnet is fixedly connected to the bottom of the placement plate. Mechanical pressure is applied through high-frequency vibration to achieve the compaction treatment of the sample. This process can simulate the real compaction state of underground rock, so that the sample density reaches the reservoir confining pressure level, thereby ensuring that the occurrence state of adsorbed gas is consistent with the actual formation conditions.

[0005] According to the present invention, a shale gas and coalbed methane gas content testing device includes a clamping assembly comprising a support plate, a threaded rod internally connected to the support plate, a turning handle fixedly connected to one side of the threaded rod, and a clamping block fixedly connected to the other side of the threaded rod. The combination of the threaded rod and the turning handle provides an adjustment function to adapt to different tank sizes.

[0006] According to the present invention, a shale gas and coalbed methane gas content testing device is provided, wherein a sealing cover is fixedly connected to the top of the tank body, and the sealing cover is fixedly connected by bolts, and the sealing cover fixed by bolts forms a lock to prevent gas leakage under high pressure.

[0007] According to the present invention, a shale gas and coalbed methane gas content testing device is provided, wherein the interior of the supporting plate is provided with a groove for the placement plate to slide, the damping rod is fixedly connected to the top of the supporting base and the bottom of the placement plate, and the vibration direction is limited by the guide rod.

[0008] According to the shale gas and coalbed methane gas content testing device of this utility model, the clamping assembly is provided in two sets, both of which are fixedly connected to the top of the placement plate.

[0009] According to the present invention, in a shale gas and coalbed methane gas content testing device, the arc-shaped surface of the clamping block is in contact with the outer surface of the tank body, and the contact surface between the clamping block and the tank body is provided with anti-slip texture. By the arc-shaped surface of the clamping block being in contact with the outer wall of the tank body, and in conjunction with the anti-slip texture, the friction is enhanced and displacement during vibration is prevented.

[0010] According to the present invention, a shale gas and coalbed methane gas content testing device is provided, wherein multiple electric heating plates are provided and all are fixedly connected to the inner wall of the tank body. The multiple electric heating plates are provided to achieve rapid and uniform heating and simulate the formation temperature conditions.

[0011] According to the present invention, in a shale gas and coalbed methane gas content testing device, the gas intake component is fixedly connected to the top of the support base.

[0012] Beneficial effects: This utility model, through the inclusion of vibration components and other structures, uses the alternating magnetic poles of electromagnets and permanent magnets to drive high-frequency vibration, combined with a suction pump for synchronous vacuuming, to form a dynamic gas removal mechanism. This improves the efficiency of removing residual gas from the main body of the tank, avoiding interference from residual gas in the tank on the test results. After the gas is evacuated, the material is placed into the main body of the tank, and mechanical pressure is applied through high-frequency vibration to achieve sample compaction. This process can simulate the real compaction state of underground rock, making the sample density reach the reservoir confining pressure level, thereby ensuring that the occurrence state of adsorbed gas is consistent with the actual formation conditions. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a structural diagram of the entire utility model;

[0015] Figure 2 This is a structural diagram showing the connection relationship of the air intake component of this utility model;

[0016] Figure 3 This is a structural diagram of the vibration assembly of this utility model;

[0017] Figure 4 This is a structural diagram of the interior of the tank body of this utility model.

[0018] Legend:

[0019] 1. Tank body; 2. Vibration assembly; 3. Suction assembly; 4. Clamping assembly;

[0020] 101. Feed inlet; 102. Electric heating plate; 201. Support base; 202. Support plate; 203. Guide rod; 204. Placement plate; 205. Spring; 206. Damping rod; 207. Electromagnet; 208. Permanent magnet; 301. Gas collection tank; 302. Air pump; 303. Air outlet pipe; 304. Gas collection pipe; 401. Turning handle; 402. Support plate; 403. Threaded rod; 404. Clamping block. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-4 This utility model discloses a shale gas and coalbed methane gas content testing device, comprising: a tank body 1, a vibration component 2, an air intake component 3, and a clamping component 4; a feed inlet 101 is fixedly connected to one side of the tank body 1, and an electric heating plate 102 is fixedly connected inside the tank body 1; the air intake component 3 includes a gas collecting tank 301, an air intake pump 302 is fixedly connected to the top of the gas collecting tank 301, an air outlet pipe 303 is fixedly connected to one side of the air intake pump 302, and an air collecting pipe 304 is fixedly connected to the top of the air intake pump 302, the air collecting pipe 304 is fixedly connected to the tank body 1, a sealing cover is fixedly connected to the top of the tank body 1, and the sealing cover is fixedly connected by bolts; multiple electric heating plates 102 are provided, and all are fixedly connected to the inner wall of the tank body 1; the air intake component 3 is fixedly connected to the top of the support base 201.

[0023] Specifically, a sealing cover connected by threads is provided on one side of the feed inlet 101, and a removable sealing cover is fixed to the top of the tank body 1 by bolts. Multiple electric heating plates 102 are evenly distributed around the inner wall of the tank, and the spacing between each heating plate is equal and they are fixed by welding, which can achieve precise temperature control heating.

[0024] The vibration assembly 2 includes a support base 201, a support plate 202 fixedly connected to one side of the top of the support base 201, a guide rod 203 fixedly connected inside the support plate 202, a placement plate 204 slidably connected to the outside of the guide rod 203, a damping rod 206 fixedly connected to the top of the support base 201, a spring 205 wound around the damping rod 206, an electromagnet 207 fixedly connected to the top of the support base 201, a permanent magnet 208 fixedly connected to the bottom of the placement plate 204, a groove for the placement plate 204 to slide in the interior of the support plate 202, and the damping rod 206 fixedly connected to the top of the support base 201 and the bottom of the placement plate 204.

[0025] Specifically, support plates 202 are vertically welded to both sides of the support base 201. The support plates 202 have guide grooves inside, and two guide rods 203 are vertically installed in the grooves. The placement plate 204 and the guide rods 203 are in sliding fit. Two sets of damping rods 206 are symmetrically arranged at the bottom of the placement plate 204. A spring 205 is sleeved around each damping rod. An electromagnet 207 is fixedly connected to the top of the support base 201, and a permanent magnet 208 is fixedly connected to the bottom of the placement plate 204. The reciprocating magnetic force is generated by turning the electromagnet 207 on and off to drive the vibration.

[0026] The clamping assembly 4 includes a support plate 402, with a threaded rod 403 internally threaded to the support plate 402. A turning handle 401 is fixedly connected to one side of the threaded rod 403, and a clamping block 404 is fixedly connected to the other side of the threaded rod 403. Two sets of clamping assemblies 4 are provided, and both are fixedly connected to the top of the placement plate 204. The arc-shaped surface of the clamping block 404 fits against the outer surface of the tank body 1, and the contact surface between the clamping block 404 and the tank body 1 is provided with anti-slip texture.

[0027] Specifically, one end of the threaded rod 403 is welded with a turning handle 401, and the other end is fixed with a shaft connected to an arc-shaped clamping block 404.

[0028] Working principle: Before conducting the gas content test, the electromagnet 207 is switched on and off alternately, and the magnetic poles are changed to drive the placement plate 204 to vibrate at high frequency along the guide rod 203. At the same time, the suction pump 302 is turned on to extract the residual air inside the tank body 1 and discharge it through the exhaust pipe 303, so as to avoid the measurement results being affected by the residual gas inside the tank body 1.

[0029] After the gas inside the tank body 1 is evacuated, the material is put in through the feed inlet 101 and covered with a sealing cap. By rotating the handles 401 of the clamping components 4 on both sides, the clamping blocks 404 are tightly attached to the surface of the tank to complete the fixation. The electric heating plate 102 is started for constant temperature heating. At the same time, the electromagnet 207 is controlled to alternately turn on and off. Through the magnetic pole change, the placement plate 204 is driven to vibrate at high frequency along the guide rod 203 to achieve the compaction treatment of the sample. This process can simulate the real compaction state of underground rock, so that the sample density reaches the reservoir confining pressure level, thereby ensuring that the occurrence state of adsorbed gas is consistent with the actual formation conditions. The released shale gas is drawn into the gas collection tank 301 by the gas collection pipe 304 and the gas suction pump 302, and finally subjected to metering analysis.

[0030] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A device for testing the gas content of shale gas and coalbed methane, characterized in that, include: Tank body (1), vibration assembly (2), air intake assembly (3) and clamping assembly (4); A feed inlet (101) is fixedly connected to one side of the tank body (1), and an electric heating plate (102) is fixedly connected inside the tank body (1). The air suction assembly (3) includes an air collection tank (301), an air suction pump (302) is fixedly connected to the top of the air collection tank (301), an air outlet pipe (303) is fixedly connected to one side of the air suction pump (302), and an air collection pipe (304) is fixedly connected to the top of the air suction pump (302). The air collection pipe (304) is fixedly connected to the tank body (1). The vibration assembly (2) includes a support base (201), a support plate (202) is fixedly connected to one side of the top of the support base (201), a guide rod (203) is fixedly connected inside the support plate (202), a placement plate (204) is slidably connected to the outside of the guide rod (203), a damping rod (206) is fixedly connected to the top of the support base (201), a spring (205) is wound around the damping rod (206), an electromagnet (207) is fixedly connected to the top of the support base (201), and a permanent magnet (208) is fixedly connected to the bottom of the placement plate (204).

2. The shale gas and coalbed methane gas content testing device according to claim 1, characterized in that, The clamping assembly (4) includes a support plate (402), and a threaded rod (403) is threadedly connected inside the support plate (402). A turning handle (401) is fixedly connected to one side of the threaded rod (403), and a clamping block (404) is fixedly connected to the other side of the threaded rod (403).

3. The shale gas and coalbed methane gas content testing device according to claim 1, characterized in that, The top of the tank body (1) is fixedly connected with a sealing cover, and the sealing cover is fixedly connected by bolts.

4. The shale gas and coalbed methane gas content testing device according to claim 1, characterized in that, The support plate (202) has a groove inside for the placement plate (204) to slide, and the damping rod (206) is fixedly connected to the top of the support base (201) and the bottom of the placement plate (204).

5. The shale gas and coalbed methane gas content testing device according to claim 2, characterized in that, The clamping assembly (4) is provided in two sets, both of which are fixedly connected to the top of the placement plate (204).

6. The shale gas and coalbed methane gas content testing device according to claim 5, characterized in that, The arc-shaped surface of the clamping block (404) fits against the outer surface of the tank body (1), and the contact surface between the clamping block (404) and the tank body (1) is provided with anti-slip texture.

7. The shale gas and coalbed methane gas content testing device according to claim 1, characterized in that, Multiple electric heating plates (102) are provided, and all of them are fixedly connected to the inner wall of the tank body (1).

8. The shale gas and coalbed methane gas content testing device according to claim 1, characterized in that, The air intake assembly (3) is fixedly connected to the top of the support base (201).

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