CN111980673B - Test device and test method for simulating marine energy soil-well coupling effect caused by hydrate exploitation - Google Patents
Test device and test method for simulating marine energy soil-well coupling effect caused by hydrate exploitation Download PDFInfo
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- CN111980673B CN111980673B CN202010891748.0A CN202010891748A CN111980673B CN 111980673 B CN111980673 B CN 111980673B CN 202010891748 A CN202010891748 A CN 202010891748A CN 111980673 B CN111980673 B CN 111980673B
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 230000001808 coupling effect Effects 0.000 title claims abstract description 19
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 18
- 238000011068 loading method Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 49
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000012466 permeate Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
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- 238000004064 recycling Methods 0.000 claims 1
- 238000011160 research Methods 0.000 description 6
- 239000013049 sediment Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 238000012545 processing Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/001—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells specially adapted for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
- E21B49/025—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil of underwater soil, e.g. with grab devices
Abstract
The invention belongs to the field of ocean energy soil exploitation mechanics test, and particularly relates to a test device and a test method for simulating the coupling effect of ocean energy soil and a well caused by hydrate exploitation. The testing device comprises a triaxial pressure chamber, a stress loading system, an air supply pressurizing system, a constant-temperature water bath, a exploitation well, a back pressure valve, a gas-liquid separation and recovery system and a data acquisition system; the stress loading system is connected with the triaxial pressure chamber to realize loading in different stress modes; the gas supply pressurizing system is connected with the triaxial pressure chamber, and is used for providing a gas source and controlling the application of gas pressure to generate hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the exploitation well is placed in the sample and is installed in the triaxial pressure chamber, and the earth-well coupling effect caused by exploitation is simulated; the back pressure valve is connected with the triaxial pressure chamber, and the pressure is reduced to realize the decomposition of the hydrate; the gas-liquid separation and recovery system is connected with a back pressure valve to meter and recover gas and liquid; the data acquisition system acquires test data at regular time and stores and processes the test data. The invention can realize the generation of ocean hydrate energy soil and can accurately test the energy soil-well coupling effect caused by ocean hydrate exploitation.
Description
Technical Field
The invention belongs to the field of ocean energy soil exploitation mechanics test, and particularly relates to a test device and a test method for simulating the coupling effect of ocean energy soil and a well caused by hydrate exploitation.
Background
The natural gas hydrate is used as a novel clean energy source, has little pollution and huge resource potential. The exploitation of hydrates is thus a research hotspot in the world today. It is counted that more than about 99% of the hydrates exist in the seabed in a stable low-temperature and high-pressure environment and are mixed with sand to form ocean energy soil. The marine energy soil has poor diagenetic property and low shear strength, and the hydrate has an effective cementing effect in the pores thereof. In the exploitation process, the saturation, strength, rigidity and the like of the energy soil can be changed by the decomposition of the hydrate, so that the pore pressure of the energy soil is increased, the effective stress and the cementing strength of a soil layer are reduced, the formation deformation around a production well is caused, the mechanical property of a shaft is further influenced, and even geological disasters such as well wall instability, submarine landslide, sea-land subsidence and the like are caused. However, the previous researches on hydrates are mainly focused on productivity evaluation and mechanical properties of sediments, and influence of hydrate exploitation on soil and a shaft is ignored; therefore, the research on the coupling effect of the marine soil and the well by the development of the hydrate exploitation has important significance on the hydrate exploitation.
The mechanical property of ocean energy soil is one of the important points of the current research, zhou Guzuo and the like summarize the existing test experience in the research and application of a multifunctional hydrate sediment triaxial test system (geotechnical mechanics, 41 (1): 343-352, 2020.) and a novel multifunctional hydrate sediment triaxial test system is provided. The system comprises an air supply and exhaust module, a stress loading module, a temperature control module, a data acquisition module and an auxiliary module, wherein the parts are relatively independent and have good synergy and expansibility. The hydraulic pump is used for loading confining pressure and axial pressure, and the hydrate synthesis, triaxial shear, body deformation measurement and hydrate decomposition test are realized through different loading modes. The system can accurately test the volume deformation in the triaxial test process, control the temperature and air pressure conditions of decomposition and test the deformation in the decomposition process, and can lay an experimental foundation for the research on the physical properties of the hydrate sediment. However, the mechanical parameters of the soil body are changed due to the exploitation of the hydrate, so that the mechanical properties of the shaft are affected, and the influence of the exploitation of the hydrate on the production well is not considered by the test system.
Based on the reference to domestic related data, the conventional triaxial test device for the hydrate is considered to have certain limitation, and the influence of the exploitation of the hydrate on soil and a shaft cannot be considered at the same time. The invention improves on the basis of the existing hydrate test equipment at present, and discloses a test device and a test method for simulating the coupling effect of ocean energy soil-well caused by hydrate exploitation. The device can realize the generation of ocean energy soil, carry out the mechanical characteristic test of the contact surface of the energy soil sample and the shaft, simulate the soil-well coupling effect caused by the exploitation of the hydrate, and provide good test technical support for researching the influence of the exploitation of the hydrate on the ocean energy soil-well coupling effect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a testing device and a testing method for simulating the marine energy soil-well coupling effect caused by hydrate exploitation. The device can measure the strain of the soil body, the stress of the shaft and the change of the gas pressure in the hydrate exploitation process, and the device is displayed by utilizing a data acquisition system, and is simple to operate and reliable in result.
In order to achieve the above object, the present invention adopts the following solution:
a test device for simulating the effects of hydrate extraction on marine energy soil-well coupling, comprising: the system comprises a triaxial pressure chamber, a stress loading system, a gas supply pressurizing system, a constant-temperature water bath system, a mining well, a back pressure valve, a gas-liquid separation and recovery system and a data acquisition system; wherein: the stress loading system is connected with the triaxial pressure chamber to realize loading in different stress modes; the gas supply pressurizing system is connected with the triaxial pressure chamber, and is used for providing a gas source and controlling the application of gas pressure to generate hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the exploitation well is placed in the sample and is installed in the triaxial pressure chamber, and the earth-well coupling effect caused by exploitation is simulated; the back pressure valve is connected with the triaxial pressure chamber, and the pressure is reduced to realize the decomposition of the hydrate; the gas-liquid separation and recovery system is connected with a back pressure valve to meter and recover gas and liquid; the data acquisition system acquires test data at regular time and stores and processes the test data.
Compared with the prior art, the invention has the following beneficial effects:
1. test soil samples containing natural gas hydrate can be stably generated;
2. the round holes are formed in the upper cushion block from the lower surface, so that the upper cushion block is ensured not to contact with the shaft all the time in the test process, and the test of the mechanical characteristics of the contact surface of the test soil sample and the shaft is realized
3. The exploitation well is arranged in the center of the inside of the sample, the opening of the shaft ensures the flow of gas and liquid, and the soil-well coupling effect caused by the exploitation of hydrate can be simulated;
5. the data acquisition system automatically acquires and calculates, so that the degree of automation is high, and test errors caused by manual subjective data processing are avoided;
drawings
FIG. 1 is a schematic structural diagram of a test apparatus for simulating the effects of hydrate recovery on marine energy soil-well coupling;
FIG. 2 is a schematic diagram of the circular base, upper pad and production well configuration in a test apparatus simulating the effects of hydrate production on marine energy soil-well coupling;
FIG. 3 is a schematic diagram of a gas-liquid separation recovery system in a test apparatus simulating the effects of hydrate extraction on marine energy soil-well coupling.
In the figure: 1. the device comprises a triaxial pressure chamber, a triaxial pressure loader, a confining pressure loader, a mining well, a gas supply pressurization system, a constant-temperature water bath system, a back pressure valve, a gas-liquid separation recovery system and a data acquisition system.
Detailed Description
As shown in fig. 1, a test apparatus for simulating a marine energy soil-well coupling effect caused by hydrate recovery, comprising: the device comprises a triaxial pressure chamber 1, an axial pressure loader 2, a confining pressure loader 3, a mining well 4, a gas supply pressurization system 5, a constant-temperature water bath system 6, a back pressure valve 7, a gas-liquid separation recovery system 8 and a data acquisition system; wherein: the stress loading systems 2 and 3 are connected with the triaxial pressure chamber 1 to realize loading in different stress modes; the gas supply pressurizing system 5 is connected with the triaxial pressure chamber 1, and is used for providing a gas source and controlling the application of gas pressure to generate hydrate; the constant-temperature water bath system 6 seamlessly surrounds the triaxial pressure chamber 1 and controls the indoor temperature; the exploitation well 4 is placed inside the sample and is installed in the triaxial pressure chamber 1 to simulate the earth-well coupling effect caused by exploitation; the back pressure valve 7 is connected with the triaxial pressure chamber 1, and the pressure is reduced to realize the decomposition of hydrate; the gas-liquid separation and recovery system 8 is connected with the back pressure valve 7 and is used for metering and recovering gas and liquid; the data acquisition system 9 acquires test data at regular time and stores the test data.
The air supply pressurizing system 5 comprises a high-pressure pump 51, a pressure regulating valve 52, a pressure gauge 53 and an air valve 54. The high-pressure pump 51 is connected with a pressure regulating valve 52 to set the pressure of the buffer container, a pressure gauge 53 is used for measuring the air pressure, and an air valve 54 controls the air input.
The constant-temperature water bath system 6 seamlessly surrounds the triaxial pressure chamber 1, and the temperature application range is-10-20 ℃. The thermometer 61 can measure the internal temperature of the triaxial pressure chamber 1, ensuring accurate control of the temperature.
The back pressure valve 7 is connected with the triaxial pressure chamber 1 through an upper cushion block 11, when the pressure of the back pressure valve 7 is lower than the internal pressure of the sample, gas is discharged through the back pressure valve 7 until the pressure reaches the same as that of the back pressure valve 7, and the back pressure valve 7 is arranged to control the pressure reduction so as to realize the decomposition of the hydrate. The pressure gauge 71 is used for measuring the gas pressure in the pipeline; a gas-liquid valve 72 controls the gas-liquid output.
As shown in fig. 2, the triaxial pressure chamber 1 is provided with a circular base 13, a soil body sample 12 and an upper cushion block 11 from bottom to top. The circle center of the upper surface of the circular base 13 is provided with a round hole 131 with the radius of 5mm, and the round hole 131 penetrates through part of the circular base and penetrates out from the side surface and is connected with the high-pressure air pump 51 through a pipeline 55.
The soil body sample 12 is 100mm in height and 50mm in diameter, a heat-shrinkable rubber sleeve is wrapped on the outer side, and the upper end and the lower end of the heat-shrinkable rubber sleeve are respectively connected with the upper cushion block 11 and the round base 13, so that the sample is ensured to be sealed; in addition, two axial strain sensors are arranged on two axial sides of the heat-shrinkable rubber sleeve, and three circumferential strain sensors are arranged on the upper part, the middle part and the lower part of the outer surface; the center of the soil body sample 12 is provided with a round hole, and the diameter of the round hole is the same as that of the shaft, so that the shaft can be placed.
The upper cushion block 11 is provided with a round hole 111 with the diameter of 17mm from the lower surface, the distance between the top of the round hole 111 and the top of the shaft is at least 15 cm, the upper cushion block 11 is ensured not to contact with the shaft all the time in the test process, and the coupling test of the soil body sample and the shaft is realized; and a round hole 112 penetrates out of the side surface of the upper cushion block 11 and is connected with the back pressure valve 7 through a pipeline 73.
The exploitation well 4 is a cylinder with the diameter of 15mm, is placed in the center of the inside of the sample 12, the bottom of the well is in contact with the circular base 13, the top of the well is 3cm higher than the sample, and a sealing rubber ring 41 is arranged at the part exceeding the soil body, so that the sealing with a round hole of an upper cushion block is ensured, and gas and water cannot permeate outwards; openings 42 on the circumference of the shaft ensure the gas and water to flow, and steel wire meshes are wrapped outside after the openings, so that no solid particles enter the pipeline to cause blockage; and a stress sensor is arranged around the shaft to monitor the stress state of the shaft.
As shown in fig. 3, the gas-liquid separation recovery system 8 includes a gas-liquid separator 81, a drying box 82, a gas flow meter 83, a gas collection device 84, a liquid flow meter 85, and a liquid collection device 86. The gas-liquid separator 81 is connected with the back pressure valve 7 to separate the gas-liquid mixture; the liquid flows directly into the liquid recovery device 86 and the gas flows through the dry box 82 into the gas recovery device 84 and is metered. The gas flow meter 83 records the gas production rate and the cumulative gas production, thereby judging the production condition of the hydrate.
The test method for simulating the influence of hydrate exploitation on the coupling effect of the marine soil and the well adopts the measurement device, and comprises the following steps:
1. mixing sand with deionized water to prepare an unsaturated test soil sample with certain dry density and water content, wrapping the unsaturated test soil sample with a heat-shrinkable rubber sleeve, and placing the unsaturated test soil sample in a triaxial pressure chamber;
2. applying confining pressure and axial pressure to preset pressure through a stress loading system, then injecting methane gas into a soil body sample to preset pressure by using a gas supply pressurizing system, carrying out leak detection and standing;
3. injecting water into the water bath tank, reducing the temperature in the triaxial pressure chamber to the temperature (below 5 ℃) required by the reaction, generating hydrate at the moment, and gradually reducing the pressure in the pressure chamber; when the pressure in the pressure chamber is kept unchanged, the natural gas hydrate is successfully generated;
4. the pressure of the pressure valve is regulated to be lower than the pressure of the sample, and the gas is discharged through the back pressure valve until the pressure of the back pressure valve is equal to the pressure in the sample, so that the depressurization exploitation is realized; when the gas pressure is reduced to the hydrate decomposition pressure, the hydrate starts to decompose. The gas-liquid mixture discharged by the back pressure valve is separated by a gas-liquid separator, and is recovered and metered respectively. And the decomposition state of the hydrate can be judged by a gas meter.
5. Hydrate decomposition results in a reduced rigidity of the test specimen, resulting in decomposition deformation, and a soil-well coupling effect. The sample strain sensor can obtain soil deformation, and the shaft stress sensor can monitor the stress state of the shaft, so that the shaft elastic deformation is obtained through calculation; and taking out the shaft after the test is finished, and measuring the plastic deformation of the shaft.
6. In addition, the mechanical property test of the contact surface between the energy soil sample and the shaft can be carried out; after the hydrate is generated, axial load is slowly applied through a stress loading system, and the contact deformation of the energy soil sample and the shaft is generated, so that the mechanical characteristics of the contact surface of the hydrate energy soil sample and the shaft structure are obtained.
Claims (6)
1. A test method for a test device for simulating marine energy soil-well coupling caused by hydrate exploitation, the test device comprising: the system comprises a triaxial pressure chamber, a stress loading system, a gas supply pressurizing system, a constant-temperature water bath system, a mining well, a back pressure valve, a gas-liquid separation and recovery system and a data acquisition system; the stress loading system is connected with the triaxial pressure chamber to realize loading in different stress modes; the gas supply pressurizing system is connected with the triaxial pressure chamber, and is used for providing a gas source and controlling the application of gas pressure to generate hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the exploitation well is placed in the sample and is installed in the triaxial pressure chamber, and the earth-well coupling effect caused by exploitation is simulated; the back pressure valve is connected with the triaxial pressure chamber, and the pressure is reduced to realize the decomposition of the hydrate; the gas-liquid separation and recovery system is connected with a back pressure valve to meter and recover gas and liquid; the data acquisition system acquires test data at regular time and stores the test data;
the test method comprises the following steps:
(1) Mixing sand with deionized water to prepare an unsaturated test soil sample with certain dry density and water content, wrapping the unsaturated test soil sample with a heat-shrinkable rubber sleeve, and placing the unsaturated test soil sample in a triaxial pressure chamber;
(2) Applying confining pressure and axial pressure to preset pressure through a stress loading system, then injecting methane gas into a soil body sample to preset pressure by using a gas supply pressurizing system, and standing after leak detection;
(3) Injecting water into the water bath tank, reducing the temperature in the triaxial pressure chamber to the temperature required by the reaction, generating hydrate at the moment, and gradually reducing the pressure in the pressure chamber; when the pressure in the pressure chamber is kept unchanged, the natural gas hydrate is successfully generated;
(4) The pressure of the pressure valve is regulated to be lower than the pressure of the sample, and the gas is discharged through the back pressure valve until the pressure of the back pressure valve is equal to the pressure in the sample, so that the depressurization exploitation is realized; when the gas pressure is reduced to the hydrate decomposition pressure, the hydrate starts to decompose; separating the gas-liquid mixture discharged by the back pressure valve through a gas-liquid separator, and respectively recycling and metering; and the decomposition state of the hydrate can be judged by a gas meter;
(5) The rigidity of the sample is reduced due to the decomposition of the hydrate, so that the decomposition deformation is generated, and the soil-well coupling effect is generated; the sample strain sensor can obtain soil deformation, and the shaft stress sensor can monitor the stress state of the shaft, so that the shaft elastic deformation is obtained through calculation; taking out the shaft after the test is finished to measure the plastic deformation of the shaft;
(6) In addition, the mechanical property test of the contact surface between the energy soil sample and the shaft can be carried out; after the hydrate is generated, axial load is slowly applied through a stress loading system, and the contact deformation of the energy soil sample and the shaft is generated, so that the mechanical characteristics of the contact surface of the hydrate energy soil sample and the shaft structure are obtained.
2. The method of testing a test device for simulating hydrate recovery induced marine energy soil-well coupling according to claim 1, wherein: the triaxial pressure chamber is provided with a circular base, a soil body sample and an upper cushion block from bottom to top; a round hole with the radius of 5mm is arranged at the circle center of the upper surface of the round base, penetrates through part of the round base and penetrates out from the side surface, and is connected with a high-pressure pump; the soil body sample is 100mm in height and 50mm in diameter, a heat-shrinkable rubber sleeve is wrapped on the outer side, and the upper end and the lower end of the heat-shrinkable rubber sleeve are respectively connected with the upper cushion block and the round base, so that the sample is sealed; in addition, two axial strain sensors are arranged on two axial sides of the heat-shrinkable rubber sleeve, and three circumferential strain sensors are arranged on the upper part, the middle part and the lower part of the outer surface; a round hole is arranged in the center of the soil body sample, and the diameter of the round hole is the same as that of the shaft, so that the shaft can be placed; the upper cushion block is provided with a round hole with the diameter of 17mm from the lower surface, the distance between the top of the round hole and the top of the shaft is at least 15 cm, the upper cushion block is ensured not to contact with the shaft all the time in the test process, and the coupling test of the soil body sample and the shaft is realized; and the round hole penetrates out from the side surface of the upper cushion block and is connected with the back pressure valve.
3. A method of testing a test rig for simulating the effects of hydrate extraction on marine energy earth-well coupling according to any one of claims 1-2, wherein: the exploitation well is a cylinder with the diameter of 15mm, is placed in the center of the inside of the sample, the bottom of the well is in contact with the circular base, the top of the well is 3cm higher than the sample, and a sealing rubber ring is arranged at the part exceeding the soil body, so that the exploitation well is sealed with a round hole of the upper cushion block, and gas and water cannot permeate outwards; holes are formed in the circumference of the shaft to ensure that gas and water flow, steel wire meshes are wrapped on the outer side after the holes are formed, and the situation that solid particles enter a pipeline to cause blockage is avoided; and a stress sensor is arranged around the shaft to monitor the stress state of the shaft.
4. The method of testing a test device for simulating hydrate recovery induced marine energy soil-well coupling according to claim 1, wherein: the constant-temperature water bath system comprises a water bath tank and a thermometer; the water bath tank seamlessly surrounds the triaxial pressure chamber; the temperature application range is-10 ℃ to 20 ℃.
5. The method of testing a test device for simulating hydrate recovery induced marine energy soil-well coupling according to claim 1, wherein: the back pressure valve is connected with the triaxial pressure chamber through the upper cushion block, when the pressure of the back pressure valve is lower than the internal pressure of the sample, gas is discharged through the back pressure valve until the pressure reaches the same value as the back pressure valve, and the back pressure valve is arranged to control the depressurization so as to realize the decomposition of the hydrate.
6. The method of testing a test device for simulating hydrate recovery induced marine energy soil-well coupling according to claim 1, wherein: the gas-liquid separation and recovery system comprises a gas-liquid separation meter, a gas flowmeter, a liquid flowmeter, a drying box, a gas collecting device and a liquid collecting device; the gas-liquid separator is connected with the back pressure valve to separate the gas-liquid mixture; the liquid directly flows into the liquid recovery device, and the gas flows into the gas recovery device through the drying box and is metered; the gas flowmeter records the gas production rate and the accumulated gas production rate, thereby judging the exploitation condition of the hydrate.
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| CN112858018B (en) * | 2021-01-08 | 2022-06-28 | 青岛海洋地质研究所 | Device and method for testing lateral pressure creep of hydrate-containing sediment |
| CN113008682A (en) * | 2021-02-07 | 2021-06-22 | 山东科技大学 | True triaxial hydraulic fracturing simulation test device and method for natural gas hydrate reservoir |
| CN113622906B (en) * | 2021-08-12 | 2023-12-29 | 中国石油大学(华东) | Testing device and testing method for simulating mechanical properties of ocean energy soil-well interface in hydrate exploitation process |
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