A hydrate downhole permeability monitoring device

Abstract

The present invention relates to the technical field of natural gas hydrate reservoir permeability monitoring, and particularly to a hydrate downhole permeability monitoring device. A hydrate downhole permeability monitoring device is characterized in that it includes a sealed shell, a pressure system, a fluid isolation system, a control and data processing system, a detection system, and a plurality of valve bodies, wherein 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, and the pressure value in the test section is adjusted by the pressure system to disturb the pressure in the test section. Through the change in the pressure value, a pressure change curve is obtained to calculate the permeability of the hydrate reservoir. This solves the problem in the prior art that the pressure reduction capacity is insufficient during cable formation testing, resulting in a small pressure wave influence range and inaccurate permeability results.

Description

Technical Field

[0001] The present 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] Currently, wireline formation testing is a common method for field testing the effective absolute permeability of hydrate reservoirs. Wireline formation testing involves lowering a tool into the wellbore using a cable to extract small fluid samples from the reservoir while simultaneously recording the reservoir pressure response during the extraction phase and subsequent shut-in periods.

[0003] Wireline formation testing can be applied to both openhole and cased wells. It collects fluid samples at different depths in the reservoir and measures permeability, thereby providing a vertical distribution of reservoir permeability.

[0004] Schlumberger's modular wireline dynamic formation tester (MDT) is often used in field hydrate testing. However, due to the limited fluid extraction capacity of the pump, the pressure drop capability of wireline formation testing is insufficient, resulting in a small pressure wave impact range. The resulting permeability is only the average permeability of the reservoir within a small area around the wellbore. This is easily affected by hydrate decomposition and drilling fluid mud, and the permeability measurement may be far lower than the permeability of uncontaminated reservoirs. 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 art, such as the small detection range of the equipment and the susceptibility of the formation pressure response to hydrate decomposition and the influence of drilling fluid mud. 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 sealed housing, 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 to control the opening and closing of the plurality of valve bodies;

[0010] An accommodating space communicating with the outside is formed in the sealed housing;

[0011] 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;

[0012] The fluid isolation system is provided on the sealing housing, and is used to confine the sealing housing 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, and the pressure value in the test section is adjusted by the pressure system to disturb the pressure in the test section. A pressure change curve is obtained through the change in the pressure value to calculate the permeability of the hydrate reservoir.

[0015] As an improvement to the technical solution of the hydrate downhole permeability monitoring device of the present invention, the pressure supply system includes a pressure source, which 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 in a one-to-one correspondence and 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 to the technical solution of the hydrate downhole permeability monitoring device of the present invention, the pressure control system includes a pressure reduction system provided on the pressure supply system via a bracket;

[0019] The depressurization system includes 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 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 to 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 to 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 sealed housing.

[0027] As an improvement to 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 tires are arranged at both ends of the sealing shell.

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

[0031] As an improvement to 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] The present invention utilizes a pressure perturbation method to recover the pressure, generating a pressure recovery curve, which is then used to calculate the permeability of the hydrate reservoir. This solves the problem of insufficient pressure reduction during prior art wireline formation testing, resulting in a small pressure wave impact range and inaccurate permeability results. Furthermore, a fluid isolation system confines the sealed housing to the test section of the test well and prevents fluids outside the test section from entering the test section. This prevents the formation pressure response from 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 accompanying drawings: 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 of the invention, technical solutions and beneficial effects of the present invention clearer, the technical solutions 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 sealed housing 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 to 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 communicating with the outside is formed in the sealed housing 1;

[0041] The pressure system is arranged in the accommodating space. 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 provided on the sealing housing 1. The fluid isolation system is used to restrict the sealing housing 1 in the testing section of the testing well and to 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, and adjusts the pressure value in the test section through the pressure system to disturb the pressure in the test section. Through the change of the pressure value, a pressure change curve is obtained 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. This solves the problem in the prior art that the pressure reduction capacity is insufficient during cable formation testing, resulting in a small pressure wave influence range and inaccurate permeability results.

[0046] Among them, the fluid isolation system limits the sealing shell 1 in the test section of the test well and isolates the fluid outside the test section from entering the test section, thereby avoiding the formation pressure response being easily affected by hydrate decomposition and drilling fluid mud during testing.

[0047] In some embodiments of the present invention, the pressure supply system includes a pressure source, which is a pressure device loaded with fluid, and the pressure device is disposed 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 in a one-to-one correspondence and 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, which provides pressure within the test section. The pressure source is a pressure device loaded with fluid. In this invention, the pressure device is described using a pressure tank 2 as an example. The pressure tank 2 is detachably mounted on the sealed housing 1. Both the sealed housing 1 and the pressure tank 2 include four openings: a pressure balancing port 10, a fluid inlet port, a pressure outlet port, and a first through-hole. The corresponding pressure balancing port 10, fluid inlet port, and pressure outlet port are connected by 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 . 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 provided on the pressure supply system via 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. In addition, 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 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 through 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 to the first connecting member 15; the transmission shaft 17 of the motor 5 is connected to the second connecting member 16, and a screw 18 is connected to the outside of the first connecting member 15, and a piston rod 19 is inserted into the first and second connecting members 15 and 16; when the transmission shaft 17 of the motor 5 rotates, it drives the first and second connecting members 15 and 16 to move on the piston rod 19, and at the same time drives the first and second connecting members 15 and 16 to move on the screw 18. Preferably, the transmission shaft 17 can also be a screw.

[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 set outside the test well, and the controller 8 is detachably set 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 set in the sealed shell 1, and the data center can be set outside the test well for 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 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, it can calculate the permeability of the test section through a set mathematical model; the tester 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 sealed 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, multiple pressure sensors are provided 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 and / or gas channels to control the opening and closing of the fluid and / or gas channels. Each of the multiple valve bodies is a solenoid valve that can be controlled by a control and data processing system.

[0064] As a specific embodiment of the present invention, a pressure system is installed within the test section to achieve a pressure disturbance effect. Because the pressure tank 2 has a large capacity and its initial low pressure can be adjusted as needed, connecting to the reservoir can generate a significant pressure disturbance, effectively overcoming the limited detection range of existing wireline formation testing equipment.

[0065] Existing formation testing methods measure the pressure response of the formation pressure, which is easily affected by hydrate decomposition and drilling fluid skin. The present invention, however, measures the pressure response within pressure tank 2. Combined with the filtering effect of filter screen 13, this minimizes the impact of drilling fluid skin. By effectively controlling formation pressure fluctuations, the formation pressure can be maintained above the hydrate equilibrium pressure, preventing hydrate decomposition from interfering with monitoring results. Alternatively, the formation pressure can be maintained below the hydrate equilibrium pressure, allowing for the specific effects of hydrate decomposition on monitoring results to be studied and the underlying mechanism to be elucidated.

[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 the fluid channel connecting the two fluid inlets and outlets, wherein the first solenoid valve 11-1 is arranged on the fluid channel connecting the two fluid inlets, the second solenoid valve 11-2 is arranged on the fluid channel connecting the two fluid outlets, and the third solenoid valve 11-3 is arranged on the gas channel connecting the gas tank 4 and the rubber tire 14.

[0067] Multiple pressure sensors are 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 set on the gas storage tank 4 , and the second pressure sensor 12 - 2 is set on the pressure tank 2 .

[0068] The present invention is installed in a certain test section of a 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 airtightness of the present invention.

[0071] b. Power on and self-check to confirm that all components of the present invention are working properly; 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 passage to allow the rubber tire 14 to expand. This confines and secures the sealed housing 1 in the test section and prevents fluid from entering the test section. Close the third solenoid valve 11-3 of the gas passage.

[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, the first solenoid valve 11-1 of the fluid inlet is opened, 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, the first solenoid valve 11-1 of the fluid inlet is closed, and the pressure data is uploaded to the central data center. Then, the permeability is calculated 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 downward, discharge the pore fluid from the pressure tank 2, and at the same time clean the filter 13.

[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, repeat the above steps df.

[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 dragged 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 this 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 sealed shell, a pressure system, a fluid isolation system, a control and data processing system, a detection system and multiple 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 to control the opening and closing of the plurality of valve bodies; An accommodating space communicating with the outside is formed in the sealed housing; 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; The fluid isolation system is provided on the sealing housing, and is used to confine the sealing housing 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, and the pressure value in the test section is adjusted by the pressure system to disturb the pressure in the test section. A pressure change curve is obtained through the change in 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 includes 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 in a one-to-one correspondence and 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 provided on the pressure supply system via a bracket; The depressurization system includes 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 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 sealed housing 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 tires are 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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