Hydrate underground permeability monitoring device

Abstract

The invention relates to the technical field of natural gas hydrate reservoir permeability monitoring, in particular to a hydrate underground permeability monitoring device. A hydrate underground permeability monitoring device is characterized in that the hydrate underground permeability monitoring device comprises a sealing shell, a pressure system, a fluid isolation system, a control and data processing system, a detection system and a plurality of valve bodies, detecting a pressure value in the test section through the detection system, adjusting the pressure value in the test section through the pressure system so as to disturb the pressure in the test section, and obtaining a pressure change curve through the change of the pressure value so as to calculate the permeability of the hydrate reservoir. The problems that in the prior art, when a cable formation test is conducted, the pressure reduction capacity is insufficient, the influence range of pressure waves is small, and the obtained permeability result is inaccurate are solved.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas hydrate reservoir permeability monitoring, in particular to a hydrate downhole permeability monitoring device. Background Art

[0002] At present, the wireline formation test method is commonly used in the field test of the effective absolute permeability of hydrate reservoirs. The wireline formation test is to use a cable to lower the tool to the bottom of the well and extract a small amount of fluid samples from the reservoir, while recording the reservoir pressure response during the extraction stage and the subsequent shut-in stage.

[0003] Wireline formation testing can be applied to both open hole wells and cased wells. Wireline formation testing can collect fluid samples at different depths of the reservoir and test the permeability to obtain the vertical distribution of reservoir permeability.

[0004] Schlumberger's modular cable formation dynamic tester MDT is mostly used in hydrate field testing. However, due to the limitation of the pump body's fluid extraction capacity, the cable formation test has insufficient pressure reduction capacity, resulting in a small pressure wave impact range. The permeability obtained is only the average permeability of the reservoir in a small range around the wellbore, which is easily affected by hydrate decomposition and drilling fluid mud. The permeability measurement result may be much lower than the permeability of the uncontaminated reservoir. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the existing cable formation testing method in the prior art, such as the small detection range of the equipment, the formation pressure response is easily affected by hydrate decomposition and drilling fluid mud skin, etc., the present invention provides a hydrate downhole permeability monitoring device, wherein the low-pressure tank and the hydrate reservoir are connected, and the permeability of the hydrate reservoir is calculated by monitoring the pressure recovery curve in the low-pressure tank.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A hydrate downhole permeability monitoring device includes a sealing shell, a pressure system, a fluid isolation system, a control and data processing system, a detection system and a plurality of valve bodies;

[0008] The control and data processing system is respectively connected to the pressure system, the fluid isolation system, the detection system and the plurality of valve bodies;

[0009] The control and data processing system is used to control the start and stop of the pressure system, the fluid isolation system and the detection system, and control the opening and closing of the plurality of valve bodies;

[0010] The sealed housing forms a containing space which is in communication with the outside;

[0011] The pressure system is arranged in the accommodating space, and the pressure system comprises a pressure supply system and a pressure control system, wherein the pressure supply system is used to provide pressure; and the pressure control system is used to adjust the pressure in the test section;

[0012] The fluid isolation system is arranged on the sealing shell, and the fluid isolation system is used to restrict the sealing shell in the testing section of the testing well and isolate the fluid outside the testing section from entering the testing section;

[0013] The detection system includes a plurality of pressure sensors, which are used to monitor the pressure value of the pressure system and transmit the pressure value data to the control and data processing system;

[0014] The fluid isolation system confines the sealed shell in the test section, the pressure value in the test section is detected by the detection system, the pressure value in the test section is adjusted by the pressure system to disturb the pressure in the test section, and a pressure change curve is obtained through the change of the pressure value to calculate the permeability of the hydrate reservoir.

[0015] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, the pressure supply system includes a pressure source, the pressure source is a pressure device loaded with fluid, and the pressure device is arranged in the accommodating space;

[0016] The sealed housing and the pressure device are both provided with a plurality of openings, the plurality of openings including a pressure balance port, a fluid inlet and outlet, and a first through hole; wherein the fluid inlet and outlet include a fluid inlet and a fluid outlet;

[0017] Among them, the pressure balance port and the fluid inlet and outlet arranged on the sealed shell and the pressure balance port and the fluid inlet and outlet arranged on the pressure device are arranged one by one, and they are connected through a fluid pipeline; the first through hole arranged on the sealed shell is the wiring harness outlet, and the first through hole arranged on the pressure device is the piston through hole.

[0018] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, the pressure control system includes a pressure reduction system arranged on the pressure supply system through a bracket;

[0019] The depressurization system comprises a driving device, a transmission device and a piston; wherein the piston is arranged in the pressure device, and the piston rod is inserted into the piston through hole;

[0020] The driving device drives the piston rod of the piston to move up and down along the axis direction of the pressure device through the transmission device;

[0021] When the piston rod moves upward, the pressure in the pressure device is reduced, making the pressure lower than the formation pressure; when the piston rod moves downward, the fluid entering the pressure device is discharged.

[0022] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, the driving device is a motor, and the transmission device is a gear transmission device;

[0023] The gear transmission device includes a first connecting member and a second connecting member, the second connecting member is fixed to the first connecting member; the transmission shaft of the motor is connected to the second connecting member, a screw is connected to the outer side of the first connecting member, and the piston rod is inserted into the first connecting member and the second connecting member;

[0024] When the transmission shaft of the motor rotates, the first connecting member and the second connecting member are driven to move on the piston rod, and at the same time, the first connecting member and the second connecting member are driven to move on the screw rod.

[0025] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, the control and data processing system includes a controller and a data center connected by a wiring harness, the data center is arranged outside the test well, the controller is detachably arranged in the accommodating space, and the wiring harness passes through the wiring harness outlet to connect the controller and the control center.

[0026] As an improvement to the technical solution of the hydrate downhole permeability monitoring device of the present invention, filter screens are provided on the fluid inlet and outlet arranged on the sealing shell.

[0027] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, the fluid isolation system includes a gas storage tank and a rubber tire connected by a gas pipeline;

[0028] The gas pipeline is provided with a valve body, and the gas storage tank and the valve body are both connected to the control and data processing system to control the gas intake of the gas pipeline;

[0029] The gas storage tank is detachably arranged in the accommodating space, and the rubber tire is arranged at both ends of the sealing shell.

[0030] As an improvement on the technical solution of the hydrate downhole permeability monitoring device of the present invention, the plurality of valve bodies are all solenoid valves.

[0031] As an improvement of the technical solution of the hydrate downhole permeability monitoring device of the present invention, a plurality of the pressure sensors are arranged on the pressure apparatus of the pressure system and / or the gas storage tank of the fluid isolation system.

[0032] Beneficial effects of the present invention:

[0033] In the present invention, a pressure disturbance method is adopted. When the pressure is restored, a pressure recovery curve is obtained, and then the permeability of the hydrate reservoir is calculated, which solves the problem that the pressure reduction capacity is insufficient during cable formation testing in the prior art, resulting in a small pressure wave influence range and inaccurate permeability results. Among them, the sealing shell is restricted in the test section of the test well by a fluid isolation system, and the fluid outside the test section is isolated from entering the test section, which avoids the formation pressure response being easily affected by hydrate decomposition and drilling fluid mud during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention.

[0035] Explanation of the reference numerals: 1-sealed housing; 2-pressure tank; 3-piston; 4-air tank; 5-motor; 6-gear transmission device; 7-wiring harness; 8-controller; 9-bracket; 10-pressure balance port; 11-1-first solenoid valve; 11-2-first solenoid valve; 11-3-first solenoid valve; 12-1-first pressure sensor; 12-2-second pressure sensor; 13-filter; 14-rubber tire; 15-first connecting piece; 16-second connecting piece; 17-drive shaft; 18-screw. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described 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.

[0037] like Figure 1 As shown, a hydrate downhole permeability monitoring device includes a sealing shell 1, a pressure system, a fluid isolation system, a control and data processing system, a detection system and a plurality of valve bodies;

[0038] The control and data processing system is respectively connected with the pressure system, the fluid isolation system, the detection system and the plurality of valve bodies;

[0039] The control and data processing system is used to control the start and stop of the pressure system, fluid isolation system and detection system, as well as the opening and closing of multiple valve bodies;

[0040] An accommodating space connected to the outside is formed in the sealed housing 1;

[0041] The pressure system is arranged in the accommodating space, and the pressure system includes a pressure supply system and a pressure control system. The pressure supply system is used to provide pressure; the pressure control system is used to adjust the pressure in the test section;

[0042] The fluid isolation system is arranged on the sealing housing 1, and the fluid isolation system is used to restrict the sealing housing 1 in the testing section of the testing well and isolate the fluid outside the testing section from entering the testing section;

[0043] The detection system includes a plurality of pressure sensors, which are used to monitor the pressure value of the pressure system and transmit the pressure value data to the control and data processing system;

[0044] Among them, the fluid isolation system confines the sealed shell 1 in the test section, detects the pressure value in the test section through the detection system, adjusts the pressure value in the test section through the pressure system to disturb the pressure in the test section, and obtains the pressure change curve through the change of the pressure value to calculate the permeability of the hydrate reservoir.

[0045] In detail, in the present invention, a pressure disturbance method is adopted. When the pressure is restored, a pressure recovery curve is obtained, and then the permeability of the hydrate reservoir is calculated, which solves the problem of insufficient pressure reduction capacity during cable formation testing in the prior art, resulting in a small pressure wave influence range and inaccurate permeability results.

[0046] The sealing shell 1 is restricted in the test section of the test well by the fluid isolation system, and the fluid outside the test section is isolated from entering the test section, thereby preventing the formation pressure response from being easily affected by hydrate decomposition and drilling fluid mud during the test.

[0047] In some embodiments of the present invention, the pressure supply system includes a pressure source, which is a pressure device loaded with a fluid, and the pressure device is arranged in the accommodating space;

[0048] The sealed housing 1 and the pressure device are both provided with a plurality of openings, including a pressure balance port 10, a fluid inlet and outlet, and a first through hole;

[0049] Among them, the pressure balance port 10 and the fluid inlet and outlet arranged on the sealed shell 1 and the pressure balance port 10 and the fluid inlet and outlet arranged on the pressure device are arranged one by one, and they are connected through a fluid channel; the first through hole arranged on the sealed shell 1 is the outlet of the wiring harness 7, and the first through hole arranged on the pressure device is the through hole of the piston 3.

[0050] Among them, since hydrates are abundant in low-temperature and high-pressure environments, the sealed shell 1 is not made of low-temperature and high-pressure resistant materials. The sealed shell 1 is used to protect various devices inside it and prevent the infiltration of pore fluids, and has high requirements for its air tightness.

[0051] In this embodiment, the pressure supply system includes a pressure source, through which pressure is provided to the test section. The pressure source is a pressure device loaded with fluid. In the present invention, the pressure device is described by taking a pressure tank 2 as an example. The pressure tank 2 is detachably mounted on the sealed housing 1. The sealed housing 1 and the pressure tank 2 each include four openings, namely a pressure balance port 10, a fluid inlet port, a pressure outlet port and a first through hole, wherein the corresponding pressure balance port 10, the fluid inlet port and the pressure outlet port are all connected through a fluid channel.

[0052] Furthermore, a filter screen 13 is provided on both the fluid inlet and the fluid outlet of the sealed housing 1 , and the filter screen 13 is used to prevent debris such as mud and sand in the test well from entering the pressure tank 2 .

[0053] Furthermore, the pressure control system includes a pressure reducing system arranged on the pressure supply system through the bracket 9, and the pressure in the test section can be reduced by the pressure reducing system.

[0054] The pressure disturbance effect is achieved by reducing the pressure in the pressure tank 2, and a pressure sensor is provided in the pressure tank 2 to obtain the pressure value in the pressure tank 2 in real time, so as to achieve the effect of monitoring the pressure value in the pressure tank 2. It should be noted that since the pressure in the pressure tank 2 needs to be monitored in real time, the sealing of the pressure tank 2 needs to be maintained.

[0055] In detail, the pressure reduction system includes a driving device, a transmission device and a piston 3; wherein the piston 3 is arranged in the pressure device, and the piston rod 19 is passed through the through hole of the piston 3; the driving device drives the piston rod 19 of the piston 3 to move up and down along the axis direction of the pressure device through the transmission device; when the piston rod 19 moves upward, the pressure in the pressure device is reduced to make the pressure lower than the formation pressure; when the piston rod 19 moves downward, the fluid entering the pressure device is discharged.

[0056] When the pressure is reduced, power is provided by the driving device and transmitted by the transmission device, so that the piston 3 moves up and down along the axis of the pressure tank 2. When the piston 3 moves upward, the pressure in the pressure tank 2 is reduced to be lower than the bottom pressure; when the piston 3 moves downward, the pressure in the pressure tank 2 is discharged, wherein the pressure here is the fluid that enters the pressure tank 2 during the pressure recovery stage, and during the discharge process, the fluid is discharged through the fluid discharge port, and the effect of cleaning the filter 13 is achieved under the action of the fluid.

[0057] As a specific example of this embodiment, the driving device is a motor 5, and the transmission device is a gear transmission device 6; the gear transmission device 6 includes a first connecting member 15 and a second connecting member 16, and the second connecting member 16 is fixed on the first connecting member 15; the transmission shaft 17 of the motor 5 is connected to the second connecting member 16, and the outer side of the first connecting member 15 is connected to a screw rod 18, and a piston rod 19 is inserted in the first connecting member 15 and the second connecting member 16; when the transmission shaft 17 of the motor 5 rotates, the first connecting member 15 and the second connecting member 16 are driven to move on the piston rod 19, and at the same time, the first connecting member 15 and the second connecting member 16 are driven to move on the screw rod 18. Preferably, the transmission shaft 17 can also be a screw rod.

[0058] In some embodiments of the present invention, the control and data processing system includes a controller 8 and a data center connected by a wiring harness 7. The data center is arranged outside the test well, and the controller 8 is detachably arranged in the accommodating space. The wiring harness 7 passes through the outlet of the wiring harness 7 to connect the controller 8 and the control center. Among them, the controller 8 is detachably arranged in the sealed shell 1, and the data center can be arranged outside the test well for the test personnel to operate. The controller 8 can send and receive signals. It directly controls the opening and closing of each valve body and the start and stop of the drive device, and collects the pressure data collected by multiple pressure sensors in the detection system, and uploads it to the data center through the wiring harness 7. The data center can save the measured pressure change data and perform visualization processing. Secondly, the permeability of the test section can be calculated through a set mathematical model; the test personnel can issue instructions in the data center to perform related operations.

[0059] In some embodiments of the present invention, the fluid isolation system includes an air storage tank 4 and a rubber tire 14 connected by a gas channel; a valve body is provided on the air pipe channel, and the air storage tank 4 and the valve body are both connected to the control and data processing system to control the air intake of the gas channel; the air storage tank 4 is detachably arranged in the accommodating space, and the rubber tire 14 is arranged at the head and tail ends of the sealed shell 1.

[0060] Among them, the gas storage tank 4 is loaded with gas, and the gas is used to inflate the rubber tire 14. When the rubber tire 14 is inflated, the sealing shell 1 can be confined and fixed in a certain test section of the test well, and the fluid outside the test section is isolated from entering the test section, thereby avoiding the formation pressure response being easily affected by hydrate decomposition and drilling fluid mud during the test.

[0061] Furthermore, arc grooves are provided at both ends of the sealing shell 1 to fix the rubber tire 14 in the arc grooves.

[0062] In some embodiments of the present invention, a plurality of pressure sensors are disposed on the pressure apparatus of the pressure system and / or the gas storage tank 4 of the fluid isolation system to obtain pressure value data of the pressure tank 2 and / or the gas storage tank 4. The pressure sensor is used to convert the pressure signal into an electrical signal.

[0063] In some embodiments of the present invention, multiple valve bodies are detachably mounted on the fluid channel and / or the gas channel to control the opening and closing of the fluid channel and / or the gas channel. The multiple valve bodies are all solenoid valves that can be controlled by a control and data processing system.

[0064] As a specific embodiment of the present invention, the present invention achieves the effect of pressure disturbance by setting a pressure system in the test section. Since the pressure tank 2 has a large capacity and the initial low pressure therein can be adjusted as needed, the connected reservoir can generate a large pressure disturbance, effectively overcoming the defect of the small detection range of the equipment of the existing cable formation testing method.

[0065] The pressure response measured by the existing formation test method is the response of the formation pressure, which is easily affected by hydrate decomposition and drilling fluid mud skin; while the present invention measures the pressure response in the pressure tank 2, and the filtering effect of the filter screen 13 reduces the influence of the drilling fluid mud skin as much as possible. On this basis, by controlling the fluctuation of the formation pressure, on the one hand, the formation pressure can be made higher than the hydrate phase equilibrium pressure to prevent hydrate decomposition from interfering with the monitoring results; on the other hand, the formation pressure can be made lower than the hydrate phase equilibrium pressure to study the specific situation of hydrate decomposition affecting the monitoring results and analyze its mechanism.

[0066] As a specific embodiment of the present invention, multiple valve bodies are connected to the controller 8, and the multiple valve bodies include a first solenoid valve 11-1, a second solenoid valve 11-2 and a third solenoid valve 11-3. The first solenoid valve 11-1 and the second solenoid valve 11-2 are arranged on a fluid channel connecting two fluid inlets and outlets, wherein the first solenoid valve 11-1 is arranged on a fluid channel connecting two fluid inlets, the second solenoid valve 11-2 is arranged on a fluid channel connecting two fluid outlets, and the third solenoid valve 11-3 is arranged on a gas channel connecting the gas storage tank 4 and the rubber tire 14.

[0067] The multiple pressure sensors are all connected to the controller 8 , and the multiple pressure sensors include a first pressure sensor 12 - 1 and a second pressure sensor 12 - 2 . The first pressure sensor 12 - 1 is arranged on the gas storage tank 4 , and the second pressure sensor 12 - 2 is arranged on the pressure tank 2 .

[0068] The present invention is installed in a certain test section of the test well through a fluid isolation system and is wrapped by pore fluid; the main data center is generally placed outside the test well.

[0069] The specific working steps of the present invention are as follows:

[0070] a. Assemble the present invention and test the air tightness of the present invention.

[0071] b. Power on self-test to confirm that all components of the present invention are working normally; turn off the power supply of the drive device and initially set each solenoid valve to a closed state.

[0072] c. Place the present invention in the designated test section of the test well, open the third solenoid valve 11-3 of the gas channel, and expand the rubber tire 14 to restrict and fix the sealing housing 1 in the test section and isolate the fluid outside the test section of the test well from entering the test section. Close the third solenoid valve 11-3 of the gas channel.

[0073] d. Turn on the power of the motor 5 and control the motor 5 to move the piston 3 upward, thereby reducing the pressure in the pressure tank 2.

[0074] When the pressure in the pressure tank 2 is lower than a certain value of the reservoir pore pressure, the piston 3 reaches the upper limit, opens the first solenoid valve 11-1 at the fluid inlet, and the reservoir pore fluid enters the pressure tank 2. The second pressure sensor 12-2 records the pressure change data. When the pressure is consistent with the pore pressure, close the first solenoid valve 11-1 at the fluid inlet, upload the pressure data to the main data center, and then calculate the permeability based on the pressure recovery data.

[0075] e. Open the first solenoid valve 11 - 1 at the fluid inlet and the second solenoid valve 11 - 2 at the fluid outlet, control the motor 5 , drive the piston 3 to move downward, discharge the pore fluid from the pressure tank 2 , and clean the filter 13 at the same time.

[0076] f. When the piston 3 reaches the lower limit, the power supply of the motor 5 is turned off, and the first solenoid valve 11-1 at the fluid inlet and the second solenoid valve 11-2 at the fluid outlet are closed.

[0077] When the next test is performed, the above steps df are repeated.

[0078] When the test is completed, the first electromagnetic valve 11 - 1 of the gas channel is opened to deflate the rubber tire 14 so that it no longer clings to the test well wall; the device can then be towed out of the test well by a cable for recovery.

[0079] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A hydrate downhole permeability monitoring device, characterized in that: It includes a sealing shell, a pressure system, a fluid isolation system, a control and data processing system, a detection system and a plurality of valve bodies; The control and data processing system is respectively connected to the pressure system, the fluid isolation system, the detection system and the plurality of valve bodies; The control and data processing system is used to control the start and stop of the pressure system, the fluid isolation system and the detection system, and control the opening and closing of the plurality of valve bodies; The sealed housing forms a containing space which is in communication with the outside; The pressure system is arranged in the accommodating space, and the pressure system comprises a pressure supply system and a pressure control system, wherein the pressure supply system is used to provide pressure; and the pressure control system is used to adjust the pressure in the test section; The fluid isolation system is arranged on the sealing shell, and the fluid isolation system is used to restrict the sealing shell in the testing section of the testing well and isolate the fluid outside the testing section from entering the testing section; The detection system includes a plurality of pressure sensors, which are used to monitor the pressure value of the pressure system and transmit the pressure value data to the control and data processing system; The fluid isolation system confines the sealed shell in the test section, the pressure value in the test section is detected by the detection system, the pressure value in the test section is adjusted by the pressure system to disturb the pressure in the test section, and a pressure change curve is obtained through the change of the pressure value to calculate the permeability of the hydrate reservoir.

2. The hydrate downhole permeability monitoring device according to claim 1, characterized in that: The pressure supply system comprises a pressure source, which is a pressure device loaded with fluid, and the pressure device is arranged in the accommodating space; The sealed housing and the pressure device are both provided with a plurality of openings, the plurality of openings including a pressure balance port, a fluid inlet and outlet, and a first through hole; wherein the fluid inlet and outlet include a fluid inlet and a fluid outlet; Among them, the pressure balance port and the fluid inlet and outlet arranged on the sealed shell and the pressure balance port and the fluid inlet and outlet arranged on the pressure device are arranged one by one, and they are connected through a fluid pipeline; the first through hole arranged on the sealed shell is the wiring harness outlet, and the first through hole arranged on the pressure device is the piston through hole.

3. The hydrate downhole permeability monitoring device according to claim 2, characterized in that: The pressure control system includes a pressure reduction system arranged on the pressure supply system through a bracket; The depressurization system comprises a driving device, a transmission device and a piston; wherein the piston is arranged in the pressure device, and the piston rod is inserted into the piston through hole; The driving device drives the piston rod of the piston to move up and down along the axis direction of the pressure device through the transmission device; When the piston rod moves upward, the pressure in the pressure device is reduced, making the pressure lower than the formation pressure; when the piston rod moves downward, the fluid entering the pressure device is discharged.

4. The hydrate downhole permeability monitoring device according to claim 3, characterized in that: The driving device is a motor, and the transmission device is a gear transmission device; The gear transmission device includes a first connecting member and a second connecting member, the second connecting member is fixed to the first connecting member; the transmission shaft of the motor is connected to the second connecting member, a screw is connected to the outer side of the first connecting member, and the piston rod is inserted into the first connecting member and the second connecting member; When the transmission shaft of the motor rotates, the first connecting member and the second connecting member are driven to move on the piston rod, and at the same time, the first connecting member and the second connecting member are driven to move on the screw rod.

5. The hydrate downhole permeability monitoring device according to claim 2, characterized in that: The control and data processing system includes a controller and a data center connected by a wiring harness. The data center is arranged outside the test well, and the controller is detachably arranged in the accommodating space. The wiring harness passes through the wiring harness outlet to connect the controller and the control center.

6. The hydrate downhole permeability monitoring device according to claim 2, characterized in that: The fluid inlet and outlet arranged on the sealing shell are both provided with filter screens.

7. The hydrate downhole permeability monitoring device according to claim 1, characterized in that: The fluid isolation system includes a gas storage tank and a rubber tire connected by a gas pipeline; The gas pipeline is provided with a valve body, and the gas storage tank and the valve body are both connected to the control and data processing system to control the gas intake of the gas pipeline; The gas storage tank is detachably arranged in the accommodating space, and the rubber tire is arranged at both ends of the sealing shell.

8. The hydrate downhole permeability monitoring device according to claim 1, characterized in that: The plurality of valve bodies are all solenoid valves.

9. The downhole hydrate permeability monitoring device according to claim 1, characterized in that: The plurality of pressure sensors are arranged on the pressure device of the pressure system and / or the gas storage tank of the fluid isolation system.

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