Energy soil multi-path gas-water two-phase seepage and particle migration dynamic monitoring device and method

Abstract

The invention relates to a device and a method for dynamically monitoring multi-path gas-water two-phase seepage and particle migration of energy soil. The test device comprises an information acquisition and analysis module, a hydrate in-situ synthesis module, a fluid seepage and measurement module and a hydrate synthesis decomposition and particle migration dynamic monitoring module. The testing method mainly comprises the steps of sample preparation, hydrate synthesis, fluid pre-cooling, hydrate synthesis decomposition and particle migration monitoring, multiphase fluid separation and flow measurement. The multi-path gas-water two-phase seepage of the energy soil is realized by controlling the structures of the sample box and the fluid pre-cooling device, and the multi-path gas-water two-phase seepage device has the advantages of multiple functions, high efficiency, high reliability and the like. Starting from the stability of hydrates in a seepage test, a seepage fluid pressure maintaining and pre-cooling structure device is additionally arranged, and steady-state and non-steady-state control over the hydrates in the seepage process is achieved; multiple seepage paths are designed, multi-phase fluid seepage under different lines can be completed, and the method has the advantages of being ingenious in thought, high in manufacturability and the like.

Description

Technical field:

[0001] The present invention belongs to the technical field of geotechnical testing, and in particular relates to a device and method for dynamic monitoring of multi-path gas-water two-phase seepage and particle movement in energy soil. Background technology:

[0002] Natural gas hydrate (commonly known as "combustible ice") is a crystalline substance formed by water and gases such as CH4 under low temperature and high pressure environment. It is widely distributed in deep sea strata and permafrost zones on land. Soil containing natural gas hydrates is generally called hydrate-containing sediments, referred to as "energy soil". Due to the increasingly serious current energy crisis, natural gas hydrates, as a new energy source with great potential in the new century, have attracted close attention from countries around the world. However, the complex occurrence conditions of natural gas hydrates lead to the fact that their exploitation involves the coupling of multiple physical and chemical fields and the flow of solid-liquid-gas multiphase fluids. Therefore, studying the multiphase seepage problem of natural gas hydrates, exploring the gas-liquid flow law in hydrate reservoirs, and analyzing the mechanism of reservoir sediments flowing with fluids are the basis and prerequisite for solving the current sand production problem in natural gas hydrate exploitation and improving gas production efficiency.

[0003] Due to the occurrence conditions of hydrates, field tests in submarine reservoirs are difficult and costly. Therefore, most hydrate tests are conducted through indoor in-situ synthesis. At present, indoor tests on natural gas hydrates focus on mechanical property tests, micro-optical tests, acoustic and electrical tests, and seepage tests. Among them, seepage tests are mainly based on single-phase seepage test equipment, and there is a lack of test equipment that can realize dynamic observation of multiphase fluid seepage and sediment particle migration. At the same time, most hydrate seepage test equipment lacks dynamic monitoring of hydrate synthesis and decomposition, and it is difficult to ensure the stability of hydrates during seepage tests. In addition, gas-liquid separation in hydrate seepage tests is a key difficulty in seepage tests, and effective measurement of gas-liquid input and output during hydrate synthesis and decomposition is a key function of seepage test equipment. Therefore, there is an urgent need for a test device suitable for testing the dynamic observation of multiphase fluid seepage and particle migration in energy soils. Summary of the invention:

[0004] In view of the many shortcomings of the current seepage test equipment for hydrate-containing sediments, the present invention provides a device and method for dynamic monitoring of multi-path gas-water two-phase seepage and particle migration in energy soil, which can realize dynamic monitoring of multi-path, multi-state (hydrate stability, hydrate dissociation) and multi-phase fluid seepage process of hydrate-containing sediments, and at the same time can dynamically observe the migration of sediment particles caused by fluid seepage (relative position, type and volume of particles).

[0005] To achieve the above-mentioned purpose, the energy soil multi-path gas-water two-phase seepage and particle movement dynamic monitoring device described in the present invention can be divided into four modules according to the function of the test device: information collection and analysis module, hydrate in-situ synthesis module, fluid seepage and measurement module, hydrate synthesis decomposition and particle migration dynamic monitoring module, characterized in that it includes: valves and pipelines, fluid pressure regulating valves, fluid pressure sensors, temperature sensors, reactor fixing screws, methane high-pressure gas cylinders, nitrogen high-pressure gas cylinders, gas phase seepage pressure controllers, water phase seepage pressure controllers, fluid pre-cooling sealing boxes, multi-path seepage sample boxes, reactor bases, reactors, sample box stabilizing rods, low-temperature precipitation tanks, water bath systems, X-ray tubes, X-ray tubes, Radiation detector, water supply box, sealed measuring cylinder, high-precision electronic scale, gas flow meter, gas collection bag, data analysis platform; the methane high-pressure gas cylinder and nitrogen high-pressure gas cylinder are connected to the gas phase seepage pressure controller through the valve and pipeline and the fluid pressure regulating valve, the outside atmosphere is connected to the gas phase seepage pressure controller through the valve and pipeline, the gas phase seepage pressure controller is connected to the fluid pre-cooling sealing box through the valve and pipeline and the fluid pressure sensor, the temperature sensor is fixedly installed on the inner shell of the fluid pre-cooling sealing box; the water supply box is connected to the water phase seepage pressure controller through the valve and pipeline, the outside atmosphere is connected to the water phase seepage pressure controller through the valve and pipeline The multi-path seepage sample box is placed on the slot of the reactor base and is connected to the seepage hole of the reactor base through the pipeline. The reactor base is fixedly connected to the reactor through the reactor fixing screw. The reactor is connected to the sample box stabilizing rod through a ball screw. The reactor base is connected to the low-temperature precipitation tank through the valve and the pipeline. The temperature sensor is fixedly installed on the inner shell, the low-temperature precipitation tank is connected to the outside atmosphere through the valve and the pipeline, and the low-temperature precipitation tank is connected to the fluid pressure sensor through the pipeline; the fluid pressure sensor is connected to the sealed measuring cylinder through the valve and the pipeline and the fluid pressure regulating valve, the sealed measuring cylinder is placed on the high-precision electronic scale, and the sealed measuring cylinder is connected to the gas collection bag through the gas flow meter; the water bath system is connected in series with the reactor base and the reactor through the male and female connectors and pipelines, the water bath system is connected in series with the fluid pre-cooling sealing box and the low-temperature precipitation tank through the male and female connectors and pipelines, and the fluid pre-cooling sealing box is connected to the low-temperature precipitation tank through the pipeline;The data analysis platform is respectively connected in parallel with the fluid pressure sensor, temperature sensor, gas phase seepage pressure controller, water phase seepage pressure controller, water bath system, X-ray tube, X-ray detector, high-precision electronic scale and gas flow meter. ;

[0006] Further, it is characterized in that the multi-path seepage sample box consists of a sample box cover, a box body, and a filter screen. The box cover is fixedly connected to the box body by bolts. The box body is a quadrangular prism structure with an open side, and seepage holes are opened on the box body surface. The filter screen is an integrated filter screen, which is a quadrangular prism structure with an openable top, and is used in conjunction with the box body.

[0007] Further, it is characterized in that the fluid pre-cooling sealing box consists of a sealing box cover, a sealing box outer shell, a sealing box inner shell, and a temperature sensor; the fluid pre-cooling sealing box is a double-layer structure, which is a sealing box outer shell and a sealing box inner shell from the outside to the inside, and the fluid pre-cooling sealing box is provided with an inlet hole and an outlet hole, and the inlet hole is located higher than the outlet hole; the temperature sensor is placed in the sealing box inner shell, and the sealing box cover is fixedly connected to the sealing box outer shell by bolts.

[0008] Further, it is characterized in that the low-temperature sedimentation tank is composed of a sedimentation tank cover, a sedimentation tank outer shell, a sedimentation tank inner shell, and a temperature sensor; the low-temperature sedimentation tank is a double-layer structure, which is a sedimentation tank outer shell and a sedimentation tank inner shell from the outside to the inside, and the low-temperature sedimentation tank is provided with an inlet hole and an outflow hole, the inlet hole is located higher than the outflow hole, there are two outflow holes, one is connected to the outside atmosphere through the valve and the pipeline, and the other is connected to the fluid pressure sensor through the pipeline; the temperature sensor is placed in the sedimentation tank inner shell, and the sedimentation tank cover is fixedly connected to the sedimentation tank outer shell by bolts.

[0009] Furthermore, the method for using the energy soil multi-path gas-water two-phase seepage and particle movement dynamic monitoring device comprises the following steps:

[0010] S01. Sample preparation and loading: Use the layered compaction method to load the prepared sediment samples into the sample box in layers;

[0011] S02. Reactor installation: Place the sample box in the slot of the reactor base, seal the reactor, and place the sample box stabilizing rod close to the top of the sample box;

[0012] S03. Water bath cooling: The water bath is controlled by the data analysis platform to cool down the inside of the reactor;

[0013] S04. Hydrate synthesis: using in-situ synthesis method, hydrate is synthesized in-situ in the sample box;

[0014] S05. Seepage test preparation: prepare for the test according to the test plan;

[0015] S06. Start the seepage test: start the seepage test according to the test plan;

[0016] S07. The test is completed. Save the data and close the data analysis platform, remove the sample device in reverse order, and observe and measure the sediment particles in the low-temperature sedimentation tank.

[0017] Furthermore, it is characterized in that, in said S03, if the conditions of the test equipment are limited, the sealing cover on the top of the fluid pre-cooling sealing box and the low-temperature precipitation tank can be opened, and the ice-water mixture (about 0 degrees Celsius) can be poured into its outer shell, and insulation materials can be used to insulate it all around.

[0018] Furthermore, it is characterized in that, in S05, the information collection system is turned on, the seepage path is selected according to the test plan, the corresponding valves and pipelines are opened, the pressure of the fluid pressure regulating valve is set (the regulating valve pressure should be higher than the hydrate phase equilibrium pressure), and the X-ray tube and X-ray detector are turned on.

[0019] Further, it is characterized in that, in the S06, taking the water phase seepage test as an example, the water supply tank is opened, the upstream head pressure is set, the seepage test is started, the water phase fluid flow is observed, and the seepage situation is observed through the X-ray tube and the X-ray detector. Description of the drawings:

[0020] Figure 1 This is a schematic diagram of the main structure principle of the device for monitoring the multi-path gas-water two-phase seepage and particle transport dynamics of energy soil according to the present invention.

[0021] Figure 2 This is a schematic diagram of the locations of the seepage holes, oil delivery holes, temperature sensors and the fixing screw holes of the reactor base.

[0022] Figure 3 This is a schematic diagram of the positions of the bolts on the top of the reactor, the oil holes, and the stabilizer rod of the sample box.

[0023] Figure 4 These are three views of the multi-path seepage sample box (a front view, b top view, c left view, d stereoscopic view).

[0024] Figure 5 Three views of the fluid pre-cooling sealing box (a front view, b top view, c left view, d stereoscopic view).

[0025] Figure 6 These are the three views of the low-temperature sealed sedimentation tank (a front view, b top view, c left view, d stereoscopic view).

[0026] In the figure: 1 is a valve and pipeline, 2 is a fluid pressure regulating valve, 3 is a fluid pressure sensor, 4 is a temperature sensor, 5 is a fixed screw for the reactor, 6-1 is a methane high-pressure gas cylinder, 6-2 is a nitrogen high-pressure gas cylinder, 7-1 is a gas phase seepage pressure controller, 7-2 is a water phase seepage pressure controller, 8 is a fluid precooling sealing box, 9 is a multi-path seepage sample box, 9-1 is an integrated filter, 10-1 is a reactor base, 10-2 is a reactor, and 10-3 is a sample box stabilizing rod , 10-4 is a stabilizer bar ball screw, 10-5 and 10-6 are disc nuts, 11 is a low-temperature precipitation tank, 12 is a water bath system, 13-1 is an X-ray tube, 13-2 is an X-ray detector, 14 is a water supply tank, 15 is a sealed measuring cylinder, 16 is a high-precision electronic scale, 17 is a gas flow meter, 18 is a gas collection bag, 19 is a data analysis platform, 20 is a fixing screw hole for the reactor, 21 is an oil delivery hole, 22 is a seepage hole, and 23 is a multi-path seepage sample box slot. Specific implementation method:

[0027] The following is a further description of a device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement of energy soil according to the present invention in conjunction with the accompanying drawings:

[0028] like Figure 1 , 2, 3, 4, 5, and 6, a device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil of the present invention is characterized in that it includes: valves and pipelines 1, fluid pressure regulating valves 2, fluid pressure sensors 3, temperature sensors 4, reactor fixing screws 5, methane high-pressure gas cylinders 6-1, nitrogen high-pressure gas cylinders 6-2, gas phase seepage pressure controllers 7-1, water phase seepage pressure controllers 7-2, fluid pre-cooling sealing boxes 8, multi-path seepage sample boxes 9, reactor bases 10-1, reactors 10-2, sample box stabilizing rods 10-3, low-temperature precipitation tanks 11, water bath systems 12, X-ray tubes 13-1, X-ray detectors 13-2, water supply tanks 14, sealed measuring cylinders 15, and high-precision electronic scales 16. , gas flow meter 17, gas collection bag 18, data analysis platform 19; the methane high-pressure gas cylinder 6-1 and the nitrogen high-pressure gas cylinder 6-2 are connected to the gas phase seepage pressure controller 7-1 through the valve and pipeline 1 and the fluid pressure regulating valve 2, and the outside atmosphere is connected to the gas phase seepage pressure controller 7-1 through the valve and pipeline 1, and the connection with the atmosphere can realize the emptying and cleaning of the gas phase seepage pressure controller 7-1; the gas phase seepage pressure controller 7-1 is connected to the fluid pre-cooling sealing box 8 through the valve and pipeline 1 and the fluid pressure sensor 3, and the temperature sensor 4 is fixedly installed on the inner shell of the fluid pre-cooling sealing box 8, and the function of the fluid pre-cooling sealing box 8 is to The fluid (gas, water) entering the multi-path seepage sample box 9 is pre-cooled (temperature is 1 degree Celsius), and the fluid pressure sensor 3 and the temperature sensor 4 can monitor the pressure and temperature during the hydrate formation process and the seepage process to ensure the stability of the hydrate; the water supply box 14 is connected to the water phase seepage pressure controller 7-2 through the valve and the pipeline 1, and the outside atmosphere is connected to the water phase seepage pressure controller 7-2 through the valve and the pipeline, and the connection with the atmosphere can realize the emptying and cleaning of the water phase seepage pressure controller 7-2; the water phase seepage pressure controller 7-2 is connected to the fluid pre-cooling sealing box 8 through the valve and the pipeline 1 and the fluid pressure sensor 3; the fluid pre-cooling The sealing box 8 is connected to the reactor base 10-1 through the valve and the pipeline 1, and the reactor base 10-1 is fixedly installed with the temperature sensor 4 for monitoring the temperature in the reactor; the multi-path seepage sample box 9 is placed on the multi-path seepage sample box slot 23, and is connected to the seepage hole 22 of the reactor base 10-1 through the pipeline, the reactor base 10-1 and the reactor 10-2 are fixedly connected through the reactor fixing screw 5, and the reactor 10-2 is connected to the sample box stabilizing rod 10-3 through a ball screw to ensure that the sample box stabilizing rod 10-3 is in contact with the multi-path seepage sample box 9 to stabilize the multi-path seepage sample box 9;The reactor base 10-1 is connected to the low-temperature precipitation tank 11 through the valve and the pipeline 1. The temperature sensor 4 is fixedly installed on the inner shell of the low-temperature precipitation tank 11. The low-temperature precipitation tank 11 is connected to the outside atmosphere through the valve and the pipeline 1, and the gas displacement of the multi-path seepage sample box 9 can be realized. The low-temperature precipitation tank 11 is connected to the fluid pressure sensor 3 through the pipeline, and the pressure and temperature of the seepage outlet can be monitored in combination with the temperature sensor 4. After the components are connected in sequence, the gas source can be provided for hydrate synthesis. The fluid pressure sensor 3 is connected to the sealed measuring cylinder 15 through the valve and pipeline 1 and the fluid pressure regulating valve 2. The sealed measuring cylinder 15 is placed on the high-precision electronic scale 16. The sealed measuring cylinder 15 is connected to the gas collection bag 18 through the gas flow meter 17. The pressure of the seepage fluid before entering the sealed measuring cylinder 15 is controlled by the fluid pressure regulating valve 2. The flow rate of the water phase fluid can be observed. The scale of the measuring cylinder can be read manually, and monitoring can also be completed by the high-precision electronic scale 16. The gas phase fluid enters the gas flow meter 17 through the sealed measuring cylinder for detection, and the residual gas enters the gas collection bag; the water bath system 12 is connected in series with the reactor base 10-1 and the reactor 10-2 through the male and female connectors and the oil delivery hole 21-1, and the pipeline. The water bath system 12 is connected in series with the fluid pre-cooling sealing box 8 and the low-temperature precipitation tank 11 through the male and female connectors and pipelines. The fluid pre-cooling sealing box 8 is connected to the low-temperature precipitation tank 11 through the pipeline, and the The water bath system 12 is used to circulate low-temperature silicone oil for the reactor, the fluid pre-cooling sealing box 8 and the low-temperature precipitation tank 11 to achieve the purpose of cooling and pre-cooling; the data analysis platform 19 is respectively connected in parallel with the fluid pressure sensor 3, the temperature sensor 4, the gas phase seepage pressure controller 7-1, the water phase seepage pressure controller 7-2, the water bath system 12, the X-ray tube 13-1, the X-ray detector 13-2, the high-precision electronic scale 16 and the gas flow meter 17, which can realize the control of different components in the seepage test and the monitoring of temperature, pressure and fluid flow. ;

[0029] Furthermore, it is characterized in that the multi-path seepage sample box 9 is composed of a sample box cover, a box body, and a filter screen. The box cover is fixedly connected to the box body by bolts. The box body is a quadrangular prism structure with one side open, and the box body surface is provided with seepage holes. The filter screen is an integrated filter screen 9-1, which is a quadrangular prism structure with an open top, and is used in conjunction with the box body. In addition, in order to realize seepage tests with different hydraulic gradients and anisotropy, the length, width and height ratio of the multi-path seepage sample box 9 can be changed.

[0030] Further, it is characterized in that the fluid pre-cooling sealing box 8 is composed of a sealing box cover, a sealing box outer shell, a sealing box inner shell, and a temperature sensor 4; the fluid pre-cooling sealing box 8 is a double-layer structure, which is a sealing box outer shell and a sealing box inner shell from the outside to the inside, and the fluid pre-cooling sealing box 8 is provided with an inlet hole and an outlet hole, and the inlet hole is located higher than the outlet hole; the temperature sensor 4 is placed in the sealing box inner shell, and the sealing box cover is fixedly connected to the sealing box outer shell by bolts.

[0031] Further, it is characterized in that the low-temperature sedimentation tank 11 is composed of a sedimentation tank cover, a sedimentation tank outer shell, a sedimentation tank inner shell, and a temperature sensor 4; the low-temperature sedimentation tank 11 is a double-layer structure, which is a sedimentation tank outer shell and a sedimentation tank inner shell from the outside to the inside, and the low-temperature sedimentation tank 11 is provided with an inlet hole and an outflow hole, the inlet hole is located higher than the outflow hole, there are two outflow holes, one is connected to the outside atmosphere through the valve and the pipeline 1, and the other is connected to the fluid pressure sensor 3 through the pipeline; the temperature sensor 4 is placed in the sedimentation tank inner shell, and the sedimentation tank cover is fixedly connected to the sedimentation tank outer shell by bolts.

[0032] Furthermore, the method for using the energy soil multi-path gas-water two-phase seepage and particle movement dynamic monitoring device comprises the following steps:

[0033] S01. Sample preparation and loading: Use the layered compaction method to load the prepared sediment samples into the sample box in layers;

[0034] S02. Reactor installation: Place the sample box in the slot of the reactor base, seal the reactor, and place the sample box stabilizing rod close to the top of the sample box;

[0035] S03. Water bath cooling: The water bath is controlled by the data analysis platform to cool down the inside of the reactor;

[0036] S04. Hydrate synthesis: using in-situ synthesis method, hydrate is synthesized in-situ in the sample box;

[0037] S05. Seepage test preparation: prepare for the test according to the test plan;

[0038] S06. Start the seepage test: start the seepage test according to the test plan;

[0039] S07. The test is completed. Save the data and close the data analysis platform, remove the sample device in reverse order, and observe the sediment particles in the sedimentation tank.

[0040] Furthermore, it is characterized in that, in the S03, if the conditions of the test equipment are limited, the sealing covers on the top of the fluid pre-cooling sealing box 8 and the low-temperature precipitation tank 11 can be opened, and the ice-water mixture (about 0 degrees Celsius) can be poured into the outer shell, and insulation materials can be used to insulate the surrounding areas, which can also achieve the effect of pre-cooling the fluid in the inner shell of the fluid pre-cooling sealing box 8.

[0041] Furthermore, it is characterized in that, in the S05, the data analysis platform 19 is turned on, the seepage path is selected according to the test plan, the corresponding valve and pipeline 1 are opened, the pressure of the fluid pressure regulating valve 2 is set (the regulating valve pressure should be higher than the hydrate phase equilibrium pressure), the X-ray tube 13-1 and the X-ray detector 13-2 are turned on, and the energy soil in the multi-path seepage sample box 9 is preliminarily pre-photographed.

[0042] Further, it is characterized in that, in the S06, taking the water phase seepage test as an example, the water supply tank 14 is opened, the upstream head pressure is set by the water phase fluid pressure controller 7-2, the seepage test is started, the water phase fluid flow is observed, and the seepage conditions are observed through the X-ray tube 13-1 and the X-ray detector 13-2.

[0043] It should be pointed out that the above steps are only the main steps. Some minor steps, such as air tightness inspection and opening and closing control of each valve, are not described here in detail. Anyone with geotechnical testing experience can master them flexibly.

[0044] In addition, the above steps are for the seepage process of hydrate under steady state. Obviously, this equipment can also carry out hydrate non-steady-state seepage test and hydrate mining simulation test according to research needs. At the same time, it can carry out hydrate seepage test with different paths and hydraulic gradients, and dynamically observe and record the seepage situation. In addition, multiphase seepage test of conventional porous media can also be effectively carried out, and pressure and temperature conditions can be added.

Claims

1. A device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil, characterized in that: include: Valves and pipelines 1, fluid pressure regulating valve 2, fluid pressure sensor 3, temperature sensor 4, reactor fixing screw 5, methane high-pressure gas cylinder 6-1, nitrogen high-pressure gas cylinder 6-2, gas phase seepage pressure controller 7-1, water phase seepage pressure controller 7-2, fluid pre-cooling sealing box 8, multi-path seepage sample box 9, reactor base 10-1, reactor 10-2, sample box stabilizing rod 10-3, low-temperature precipitation tank 11, water bath system 12, X-ray tube 13-1, X-ray detector 13-2, water supply box 14, sealed measuring cylinder 15, high-precision electronic scale 16, gas flow meter 17, gas collection bag 18, data analysis platform 19; the methane high-pressure gas cylinder 6 -1, the nitrogen high-pressure cylinder 6-2 is connected to the gas phase seepage pressure controller 7-1 through the valve and pipeline 1 and the fluid pressure regulating valve 2, the outside atmosphere is connected to the gas phase seepage pressure controller 7-1 through the valve and pipeline 1, the gas phase seepage pressure controller 7-1 is connected to the fluid pre-cooling sealing box 8 through the valve and pipeline 1 and the fluid pressure sensor 3, and the temperature sensor 4 is fixedly installed on the inner shell of the fluid pre-cooling sealing box 8; the water supply tank 14 is connected to the water phase seepage pressure controller 7-2 through the valve and pipeline 1, and the outside atmosphere is connected to the water phase seepage pressure controller 7-2 through the valve and pipeline 1 The water phase seepage pressure controller 7-2 is connected to the fluid pre-cooling sealing box 8 through the valve and pipeline 1 and the fluid pressure sensor 3; the fluid pre-cooling sealing box 8 is connected to the reactor base 10-1 through the valve and pipeline 1, and the reactor base 10-1 is fixedly installed with the temperature sensor 4. The multi-path seepage sample box 9 is placed on the card slot of the reactor base 10-1 and is connected to the seepage hole of the reactor base 10-1 through the pipeline. The reactor base 10-1 is fixedly connected to the reactor 10-2 through the reactor fixing screw 5, and the reactor 10-2 is connected to the sample box stabilizing rod 1 0-3 are connected by a ball screw; the reactor base 10-1 is connected to the low-temperature precipitation tank 11 through the valve and the pipeline 1, the temperature sensor 4 is fixedly installed on the inner shell of the low-temperature precipitation tank 11, the low-temperature precipitation tank 11 is connected to the outside atmosphere through the valve and the pipeline 1, and the low-temperature precipitation tank 11 is connected to the fluid pressure sensor 3 through the pipeline; the fluid pressure sensor 3 is connected to the sealed measuring cylinder 15 through the valve and the pipeline 1 and the fluid pressure regulating valve 2, the sealed measuring cylinder 15 is placed on the high-precision electronic scale 16, and the sealed measuring cylinder 15 is connected to the gas collection bag 18 through the gas flow meter 17;The water bath system 12 is connected in series with the reactor base 10-1 and the reactor 10-2 through a male and female connector and a pipeline. The water bath system 12 is connected in series with the fluid pre-cooling sealing box 8 and the low-temperature precipitation tank 11 through a male and female connector and a pipeline. The fluid pre-cooling sealing box 8 is connected to the low-temperature precipitation tank 11 through the pipeline; the data analysis platform 19 is respectively connected in parallel with the fluid pressure sensor 3, the temperature sensor 4, the gas phase seepage pressure controller 7-1, the water phase seepage pressure controller 7-2, the water bath system 12, the X-ray tube 13-1, the X-ray detector 13-2, the high-precision electronic scale 16 and the gas flow meter 17. ; 2. The device for monitoring the multi-path gas-water two-phase seepage and particle movement of energy soil as claimed in claim 1, characterized in that: The multi-path seepage sample box 9 consists of a sample box cover, a box body, and a filter screen. The box cover is fixedly connected to the box body by bolts. The box body is a quadrangular prism structure with an open side, and seepage holes are opened on the box body surface. The filter screen is an integrated filter screen, which is a quadrangular prism structure with an openable top, and is used in conjunction with the box body.

3. The device for monitoring the multi-path gas-water two-phase seepage and particle movement of energy soil as claimed in claim 1, characterized in that: The fluid pre-cooling sealing box 8 is composed of a sealing box cover, a sealing box outer shell, a sealing box inner shell, and a temperature sensor 4; The fluid pre-cooling sealing box 8 is a double-layer structure, which comprises a sealing box outer shell and a sealing box inner shell from the outside to the inside. The fluid pre-cooling sealing box 8 is provided with an inlet hole and an outlet hole, and the inlet hole is located higher than the outlet hole; the temperature sensor 4 is placed in the sealing box inner shell, and the sealing box cover is fixedly connected to the sealing box outer shell by bolts.

4. The device for monitoring the multi-path gas-water two-phase seepage and particle movement of energy soil as claimed in claim 1, characterized in that: The low-temperature sedimentation tank 11 is composed of a sedimentation tank cover, a sedimentation tank outer shell, a sedimentation tank inner shell, and a temperature sensor 4; the low-temperature sedimentation tank 11 is a double-layer structure, which is a sedimentation tank outer shell and a sedimentation tank inner shell from the outside to the inside. The low-temperature sedimentation tank 11 is provided with an inlet hole and an outflow hole, and the inlet hole is located higher than the outflow hole. There are two outflow holes, one is connected to the outside atmosphere through the valve and the pipeline 1, and the other is connected to the fluid pressure sensor 3 through the pipeline; the temperature sensor 4 is placed in the sedimentation tank inner shell, and the sedimentation tank cover is fixedly connected to the sedimentation tank outer shell by bolts.

5. A method for using a device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil as described in any one of claims 1 to 4, characterized in that: The following steps are involved: S01. Sample preparation and loading: Use the layered compaction method to load the prepared sediment samples into the sample box in layers; S02. Reactor installation: Place the sample box in the slot of the reactor base, seal the reactor, and place the sample box stabilizing rod close to the top of the sample box; S03. Water bath cooling: The water bath is controlled by the data analysis platform to cool down the inside of the reactor; S04. Hydrate synthesis: using in-situ synthesis method, hydrate is synthesized in-situ in the sample box; S05. Seepage test preparation: prepare for the test according to the test plan; S06. Start the seepage test: start the seepage test according to the test plan; S07. The test is completed. Save the data and close the data analysis platform, remove the sample device in reverse order, and observe and measure the sediment particles in the low-temperature sedimentation tank.

6. The method for using the device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil as claimed in claim 5, characterized in that: In S03, if the test equipment conditions are limited, the sealing covers on the top of the fluid pre-cooling sealing box 8 and the low-temperature precipitation tank 11 can be opened, and the ice-water mixture (about 0 degrees Celsius) can be poured into the outer shell, and insulation materials can be used to insulate the surrounding areas.

7. The method for using the device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil as claimed in claim 5, characterized in that: In the S05, the data analysis platform 19 is turned on, the seepage path is selected according to the test plan, the corresponding valve and pipeline 1 are opened, the pressure of the fluid pressure regulating valve 2 is set (the regulating valve pressure should be higher than the hydrate phase equilibrium pressure), and the X-ray tube 13-1 and the X-ray detector 13-2 are turned on.

8. The method for using the device for monitoring the dynamics of multi-path gas-water two-phase seepage and particle movement in energy soil as claimed in claim 5, characterized in that: In the S06, taking the water phase seepage test as an example, the water supply tank 14 is opened, the water phase fluid pressure controller 7-2 sets the upstream head pressure, the seepage test is started, the water phase fluid flow is observed, and the seepage conditions are observed through the X-ray tube 13-1 and the X-ray detector 13-2.

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