CN111980673A - Testing device and testing method for simulating ocean energy soil-well coupling effect caused by hydrate exploitation - Google Patents
Testing device and testing method for simulating ocean energy soil-well coupling effect caused by hydrate exploitation Download PDFInfo
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- CN111980673A CN111980673A CN202010891748.0A CN202010891748A CN111980673A CN 111980673 A CN111980673 A CN 111980673A CN 202010891748 A CN202010891748 A CN 202010891748A CN 111980673 A CN111980673 A CN 111980673A
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- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 230000001808 coupling effect Effects 0.000 title claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 238000011068 loading method Methods 0.000 claims abstract description 18
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 45
- 238000007789 sealing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling 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
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims 1
- 238000011160 research Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Soil Sciences (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the field of mechanical testing of marine energy soil exploitation, and particularly relates to a testing device and a testing method for simulating a marine energy soil-well coupling effect caused by hydrate exploitation. The testing device comprises a triaxial pressure chamber, a stress loading system, an air supply pressurization system, a constant-temperature water bath, a production well, a back pressure valve, a gas-liquid separation 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 pressurization system is connected with the triaxial pressure chamber, provides a gas source and controls the application of gas pressure to generate a hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the production well is placed in the sample and is installed in the triaxial pressure chamber to simulate the soil-well coupling effect caused by production; 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 the back pressure valve and is used for metering and recovering 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 the energy soil of the ocean hydrate and can accurately test the energy soil-well coupling effect caused by the exploitation of the ocean hydrate.
Description
Technical Field
The invention belongs to the field of mechanical testing of marine energy soil exploitation, and particularly relates to a testing device and a testing method for simulating a marine energy soil-well coupling effect caused by hydrate exploitation.
Background
The natural gas hydrate is used as a novel clean energy, has little pollution and huge resource potential. Therefore, the exploitation of hydrate becomes a research hotspot in the world today. According to statistics, more than 99% of global hydrates stably exist in the seabed low-temperature high-pressure environment and are mixed with sandy soil to form the ocean energy soil. The marine energy soil has poor lithogenesis property and low shear strength, and the hydrate plays an effective cementing role in pores of the marine energy soil. In the process of mining, the decomposition of the hydrate can change the saturation, strength, rigidity and the like of the energy soil, so that the pore pressure of the energy soil is increased, the effective stress and the cementation 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 instability of a well wall, landslide of a sea bottom, sinking of a sea floor and the like are caused. However, the previous research on the hydrate mainly focuses on productivity evaluation and mechanical characteristics of the deposit, and neglects the influence of hydrate mining on soil and a shaft; therefore, the research of the hydrate exploitation on the ocean soil-well coupling effect has important significance on the hydrate exploitation.
The ocean energy source soil mechanics property is one of the current research focuses, the existing test experience is summarized in the research and application of the multifunctional hydrate sediment triaxial test system (geotechnical mechanics, 41 (1): 343-. 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 each part is relatively independent and has good synergy and expansibility. And (3) loading confining pressure and axial pressure by adopting a hydraulic pump, and realizing hydrate synthesis, triaxial shearing, volume change measurement and hydrate decomposition test by different loading modes. The system can accurately test the volume deformation in the triaxial test process, control the decomposition temperature and air pressure condition and test the deformation in the decomposition process, and can lay the experimental foundation for the research of the mechanical properties of hydrate sediments. However, the mechanical parameters of the soil body are changed due to the exploitation of the hydrate, so that the mechanical property of the shaft is influenced, and the influence of the exploitation of the hydrate on the production well is not considered in the test system.
On the basis of referring to domestic related data, the existing hydrate triaxial test device is considered to have certain limitations, and the influence of hydrate exploitation on soil and a shaft cannot be considered at the same time. The invention provides a testing device and a testing method for simulating the marine energy soil-well coupling effect caused by hydrate exploitation, which are improved on the basis of the existing hydrate testing equipment. The device can realize the generation of ocean energy soil, carries out the mechanical characteristic test of the energy soil sample and the shaft contact surface, and can simulate the soil-well coupling effect caused by hydrate exploitation, and provides good test technical support for researching the influence of the hydrate exploitation 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 process of exploiting the hydrate, displays the strain, the stress and the change of the gas pressure by using the data acquisition system, and has the advantages of simple operation and reliable result.
In order to achieve the above object, the solution adopted by the present invention is as follows:
the test device for simulating the ocean energy source soil-well coupling effect caused by hydrate exploitation comprises: the system comprises a triaxial pressure chamber, a stress loading system, an air supply pressurization system, a constant-temperature water bath system, a production well, a back pressure valve, a gas-liquid separation 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 pressurization system is connected with the triaxial pressure chamber, provides a gas source and controls the application of gas pressure to generate a hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the production well is placed in the sample and is installed in the triaxial pressure chamber to simulate the soil-well coupling effect caused by production; 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 the back pressure valve and is used for metering and recovering 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. the test soil sample containing the natural gas hydrate can be stably generated;
2. the upper cushion block is provided with round holes from the lower surface, so that the upper cushion block is ensured not to be contacted with the shaft all the time in the test process, and the mechanical characteristic test of the contact surface of the test soil sample and the shaft is realized
3. The exploitation well is placed in the center of the interior of the sample, and the hole of the shaft ensures the flow of gas and liquid, so that the soil-well coupling effect caused by hydrate exploitation can be simulated;
5. the data acquisition system automatically acquires and calculates, the automation degree is high, and test errors caused by manual subjective data processing are avoided;
drawings
FIG. 1 is a schematic structural diagram of a testing device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation;
FIG. 2 is a schematic diagram of the structure of a circular base, an upper cushion block and a production well in the testing device for simulating the marine energy soil-well coupling effect caused by hydrate exploitation;
FIG. 3 is a schematic diagram of a gas-liquid separation and recovery system in a testing device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation.
In the figure: 1. the system comprises a triaxial pressure chamber, 2, an axial pressure loader, 3, a confining pressure loader, 4, a production well, 5, an air supply pressurization system, 6, a constant-temperature water bath system, 7, a back pressure valve, 8, a gas-liquid separation recovery system, 9 and a data acquisition system.
Detailed Description
As shown in fig. 1, the testing device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation comprises: the system comprises a triaxial pressure chamber 1, an axial pressure loader 2, a confining pressure loader 3, a production well 4, an air 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 pressurization system 5 is connected with the triaxial pressure chamber 1, provides a gas source and controls the application of gas pressure to generate a 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 in the sample and is installed in the triaxial pressure chamber 1 to simulate the soil-well coupling effect caused by exploitation; the back pressure valve 7 is connected with the triaxial pressure chamber 1, and the hydrate is decomposed by reducing the pressure; 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 and processes the test data.
The air supply pressurization system 5 includes 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 is used for controlling the air input.
The constant temperature water bath system 6 seamlessly surrounds the triaxial pressure chamber 1, and the temperature application range value is-10 ℃ to 20 ℃. The thermometer 61 can measure the temperature inside the three-axis pressure chamber 1, ensuring accurate temperature control.
As shown in fig. 2, the triaxial cell 1 is provided with a circular base 13, a soil sample 12 and an upper mat 11 from bottom to top. The circle center of the upper surface of the round base 13 is provided with a round hole 131 with the radius of 5mm, and the round hole 131 penetrates through part of the round base and penetrates out from the side surface and is connected with the high-pressure air pump 51 through a pipeline 55.
The soil mass sample 12 is 100mm high and 50mm in diameter, the outer side of the soil mass sample is wrapped with a thermal shrinkage rubber sleeve, and the upper end and the lower end of the thermal shrinkage rubber sleeve are respectively connected with an upper cushion block 11 and a circular base 13 to ensure the sealing of the sample; in addition, two axial strain sensors are arranged on two axial sides of the thermal shrinkage rubber sleeve, and three annular 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 and is used for placing the shaft.
The upper cushion block 11 is provided with a round hole 111 with the diameter of 17mm from the lower surface, the top of the round hole 111 is at least 15 cm away from the top of the shaft, so that the upper cushion block 11 is ensured not to be contacted 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 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 round base 13, the top of the well is 3cm higher than the sample, and a sealing rubber ring 41 is arranged on the part exceeding the soil body, so that the sealing with the round hole of the upper cushion block is ensured, and the gas and the water do not leak; holes 42 are formed in the circumference of the shaft to ensure that gas and water flow, and a steel wire mesh is wrapped on the outer side after the holes are formed, so that no solid particles enter a pipeline to cause blockage; and installing a stress sensor around the shaft, and monitoring 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 separation meter 81 is connected with the back pressure valve 7 to separate a gas-liquid mixture; the liquid flows directly into the liquid recovery device 86, and the gas flows into the gas recovery device 84 through the drying box 82, and is metered. The gas flowmeter 83 records the gas production rate and the accumulated gas production rate, thereby judging the production condition of the hydrate.
The test method for simulating the influence of hydrate exploitation on the ocean soil-well coupling effect adopts the measuring device and comprises the following steps:
1. mixing sandy soil and deionized water to prepare an unsaturated test soil sample with certain dry density and water content, wrapping the unsaturated test soil sample by using a thermal shrinkage rubber sleeve, and placing the coated unsaturated test soil sample in a triaxial pressure chamber;
2. applying confining pressure and axial pressure to a preset pressure through a stress loading system, injecting methane gas into a soil body sample to the preset pressure by using a gas supply pressurization system, carrying out leak detection, and standing;
3. injecting water into the water bath water tank, reducing the temperature in the triaxial cell to the temperature required by the reaction (below 5 ℃), wherein the hydrate begins to generate, and the pressure in the cell is gradually reduced; when the pressure in the pressure chamber is kept unchanged, the natural gas hydrate is successfully generated;
4. adjusting the pressure of a pressure valve to be lower than the pressure of the sample, and exhausting gas through a back pressure valve until the pressure of the back pressure valve is equal to the pressure in the sample, so as to realize reduced pressure mining; when the gas pressure drops to the hydrate decomposition pressure, the hydrate begins to decompose. And separating the gas-liquid mixture discharged by the back pressure valve through a gas-liquid separation meter, and respectively recovering and metering. And the decomposition state of the hydrate can be judged by a gas meter.
5. The hydrate decomposition causes the rigidity of the sample to be reduced, the decomposition deformation is generated, and the soil-well coupling effect is generated. The sample strain sensor can obtain the deformation of the soil body, and the shaft stress sensor can monitor the stress state of the shaft, so that the elastic deformation of the shaft is obtained through calculation; and after the test is finished, taking out the wellbore and measuring the plastic deformation of the wellbore.
6. In addition, the mechanical property test of the contact surface of the energy soil sample and the shaft can be developed; after the hydrate is generated, axial load is slowly applied through a stress loading system, the energy soil sample is in contact deformation with the shaft, and the mechanical characteristics of the contact surface of the hydrate energy soil sample and the shaft structure are obtained.
Claims (7)
1. A testing device for simulating ocean energy source soil-well coupling effect caused by hydrate exploitation comprises: the system comprises a triaxial pressure chamber, a stress loading system, an air supply and pressurization system, a constant-temperature water bath, a production 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 pressurization system is connected with the triaxial pressure chamber, provides a gas source and controls the application of gas pressure to generate a hydrate; the constant-temperature water bath system seamlessly surrounds the triaxial pressure chamber and controls the indoor temperature; the production well is placed in the sample and is installed in the triaxial pressure chamber to simulate the soil-well coupling effect caused by production; 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 the back pressure valve and is used for metering and recovering gas and liquid; the data acquisition system acquires test data at regular time and stores and processes the test data.
2. The test device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation as claimed in claim 1, wherein: the triaxial pressure chamber is provided with a round base, a soil body sample and an upper cushion block from bottom to top. A circular hole with the radius of 5mm is arranged at the center of the circle on the upper surface of the circular base, penetrates through part of the circular base and penetrates out of the side surface of the circular base, and is connected with a high-pressure pump; the soil body sample is 100mm high and 50mm in diameter, the outer side of the soil body sample is wrapped by a heat-shrinkable rubber sleeve, and the upper end and the lower end of the heat-shrinkable rubber sleeve are respectively connected with an upper cushion block and a circular base so as to ensure the sample to be sealed; in addition, two axial strain sensors are arranged on two axial sides of the thermal shrinkage rubber sleeve, and three annular 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 is provided with a round hole, and the diameter of the round hole is the same as that of the shaft and is used for placing the shaft. The upper cushion block is provided with a round hole with the diameter of 17mm from the lower surface, and the distance between the top of the round hole and the top of the shaft is at least 15 cm, so that the upper cushion block is ensured not to be contacted 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 of the side face of the upper cushion block and is connected with the back pressure valve.
3. The test device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation according to the claims 1-2, wherein: the mining well is a cylinder with the diameter of 15mm, is placed in the center of the interior of the sample, the bottom of the well is in contact with the round base, the top of the well is 3cm higher than the sample, a sealing rubber ring is arranged on the part exceeding the soil body, sealing with the round hole of the upper cushion block is guaranteed, and gas and water do not seep outwards; holes are formed in the circumference of the shaft to ensure that gas and water flow, and a steel wire mesh is wrapped on the outer side after the holes are formed to ensure that no solid particles enter a pipeline to cause blockage; and installing a stress sensor around the shaft, and monitoring the stress state of the shaft.
4. The test device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation according to claims 1-3, wherein: the constant-temperature water bath system comprises a water bath water tank and a thermometer; the water bath water tank seamlessly surrounds the triaxial pressure chamber; the temperature application range is-10 ℃ to 20 ℃.
5. The test device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation according to claims 1-4, wherein: the back-pressure valve is connected with the triaxial pressure chamber through last cushion, and when back-pressure valve pressure was less than the inside atmospheric pressure of sample, gaseous through back-pressure valve discharge reached and equals with the back-pressure valve until atmospheric pressure, set up the steerable decompression of back-pressure valve and realize hydrate decomposition.
6. The test device for simulating the soil-well coupling effect of ocean energy caused by hydrate exploitation as claimed in claims 1 to 5, 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 separation meter 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. And the gas flowmeter records the gas production rate and the accumulated gas production rate, so as to judge the exploitation condition of the hydrate.
7. The test method for simulating the test device for the soil-well coupling effect of the ocean energy caused by the hydrate exploitation according to the claims 1-6, is characterized by comprising the following steps:
(1) mixing sandy soil and deionized water to prepare an unsaturated test soil sample with certain dry density and water content, wrapping the unsaturated test soil sample by using a thermal shrinkage rubber sleeve, and placing the coated unsaturated test soil sample in a triaxial pressure chamber;
(2) applying confining pressure and axial pressure to a preset pressure through a stress loading system, injecting methane gas into a soil body sample to the preset pressure by using a gas supply pressurization system, detecting leakage, and standing;
(3) injecting water into the water bath water tank, reducing the temperature in the triaxial pressure chamber to the temperature (below 5 ℃) required by the reaction, starting to generate a 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) adjusting the pressure of the pressure valve to be lower than the air pressure of the sample, and exhausting the gas through the back pressure valve until the pressure of the back pressure valve is equal to the air pressure in the sample, so as to realize pressure reduction exploitation; when the gas pressure drops to the hydrate decomposition pressure, the hydrate begins to decompose. And separating the gas-liquid mixture discharged by the back pressure valve through a gas-liquid separation meter, and respectively recovering and metering. And the decomposition state of the hydrate can be judged by a gas meter.
(5) And the hydrate decomposition causes the rigidity of the sample to be reduced, the decomposition deformation is generated, and the soil-well coupling effect is generated. The sample strain sensor can obtain the deformation of the soil body, and the shaft stress sensor can monitor the stress state of the shaft, so that the elastic deformation of the shaft is obtained through calculation; and after the test is finished, taking out the wellbore and measuring the plastic deformation of the wellbore.
(6) In addition, the mechanical property test of the contact surface of the energy soil sample and the shaft can be developed; after the hydrate is generated, axial load is slowly applied through a stress loading system, the energy soil sample is in contact deformation with the shaft, and the mechanical characteristics of the contact surface of the hydrate energy soil sample and the shaft structure are obtained.
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| CN112858018A (en) * | 2021-01-08 | 2021-05-28 | 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 |
| CN113622906A (en) * | 2021-08-12 | 2021-11-09 | 中国石油大学(华东) | Testing device and testing method for simulating mechanical properties of marine energy soil-well interface in hydrate exploitation process |
| CN115308105A (en) * | 2022-07-01 | 2022-11-08 | 中国石油大学(华东) | Device and method for testing soil gas-water two-phase permeability and mechanical property of near-well marine energy in combustible ice exploitation process |
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| 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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