Device for measuring influence on shaft bottom after crushing and collapsing of seabed two-gas commingling production framework

Abstract

The invention discloses a device for measuring influence on a well bottom after crushing and collapsing of a seabed two-gas commingling production framework. A water-based drilling fluid storage tank is sequentially connected with a first water pump, a fluid flowmeter, a second ball valve, a sand adder and an inlet; the outlet is sequentially connected with a first ball valve, a gas-solid two-phase separator and a water-based drilling fluid storage tank; the water storage tank is sequentially connected with a third ball valve, a second water pump and a first inlet of the box body; an outlet of the box body is sequentially connected with a tenth ball valve, a natural gas storage tank, an eleventh ball valve, a gas booster pump, a seventh gas flowmeter and a second inlet of the box body; a water layer, a mud layer, a solid hydrate layer, a middle rock stratum, a natural gas reservoir and a bottom rock stratum are sequentially arranged in the rectangular box from top to bottom. According to the invention, partial collapse and total collapse caused by skeleton breakage in the seabed two-gas commingling production process can be truly measured, and the measurement effect is good.

Description

Technical Field

[0001] This invention relates to a measuring device, and more particularly to a device for measuring the impact on the well bottom after the collapse of a subsea dual-gas production framework. Background Technology

[0002] Hydrates are a low-carbon, clean energy source with enormous untapped potential, and most of the world's hydrates exist in solid form on the seabed. In 2017, the Ministry of Natural Resources and CNOOC successfully completed a trial extraction of marine hydrates in the Pearl River Estuary in the northern South China Sea. In 2020, the Ministry of Natural Resources successfully implemented a second round of trial extraction. Academician Zhou Shouwei proposed using a solid-state fluidization method to extract seabed natural gas hydrates. This method fluidizes the hydrate-containing solids in the formation and extracts them directly, allowing the hydrates to gradually decompose into natural gas during transport. However, extraction often only targets solid hydrates. If deep natural gas could be extracted simultaneously with solid hydrate extraction, achieving dual-gas extraction, the efficiency of extraction would be greatly improved. However, the dual-gas extraction process is accompanied by many unstable operating conditions or accidents, such as framework collapse, which is a major concern. Framework collapse during dual-gas extraction would be a catastrophic event, and such accidents must be avoided in practice. Therefore, the question to be studied in this case is how to avoid the collapse of the skeletal structure during the combined extraction of gas and minerals on the seabed, or what the parameters are before and after the collapse. This will provide important guidance for improving the extraction efficiency and safety of combined extraction of gas and minerals on the seabed. Summary of the Invention

[0003] The purpose of this invention is to provide a device for measuring the impact on the well bottom after the fracture and collapse of the framework of a combined seabed gas and solid hydrate extraction system. The device is used to measure the impact on the well bottom when the framework collapses partially or completely at the seabed extraction site during the simultaneous extraction of solid hydrate and shallow natural gas.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A device for measuring the impact of a subsea combined gas and gas production system's fracture and collapse on the well bottom, the measuring device comprising a water-based drilling fluid storage tank, a first water pump, a first ball valve, a liquid flow meter, a second ball valve, a sand additive, an outlet, an inlet, an outer pipe, an inner pipe, a housing, a first inlet, a second water pump, a third ball valve, a water storage tank, a first gas flow meter, a fourth ball valve, a second gas flow meter, a fifth ball valve, a third gas flow meter, a sixth ball valve, a seventh ball valve, a fifth gas flow meter, an eighth ball valve, a sixth gas flow meter, a ninth ball valve, a small oxygen pump, a shallow solid hydrate production area, a production head, a first pressure sensor, a first horizontal production section, a deep natural gas production area, a drill bit, a production perforation, a second pressure sensor, a second horizontal production section, a housing outlet, a tenth ball valve, a first expansion joint, and a [missing information - likely a type of valve]. The system includes a natural gas storage tank, an eleventh ball valve, a second expansion joint, a gas pressurizing pump, a seventh gas flow meter, a bottom rock layer, a second inlet to the box, a natural gas reservoir, a middle rock layer, a solid hydrate layer, a control and monitoring system, a mud layer, a water layer, a rectangular box, and a gas-solid separator. A water-based drilling fluid storage tank is sequentially connected to the first water pump, a liquid flow meter, the second ball valve, a sand additive, and the inlet. Its outlet is sequentially connected to the first ball valve, the gas-solid separator, and the water-based drilling fluid storage tank. A water storage tank is sequentially connected to the third ball valve, the second water pump, and the first inlet to the box. The box outlet is sequentially connected to the tenth ball valve, the natural gas storage tank, the eleventh ball valve, the gas pressurizing pump, the seventh gas flow meter, and the second inlet to the box. The rectangular box contains, from top to bottom, a water layer, a mud layer, a solid hydrate layer, a middle rock layer, a natural gas reservoir, and a bottom rock layer.

[0005] Furthermore, the rectangular box also includes an outer pipe, an inner pipe, a shallow solid hydrate mining area, a mining head, a first pressure sensor, a first horizontal mining section, a deep natural gas mining area, a drill bit, a mining perforation, a second pressure sensor, a second horizontal mining section, a first expansion joint, and a second expansion joint.

[0006] Furthermore, the first and second expansion joints are located at the bottom of the rectangular box, and are two identical expansion joints arranged symmetrically; one end of the first and second expansion joints is fixed to the bottom of the rectangular box by welding, and the other end supports the bottom rock layer.

[0007] Furthermore, the first pressure sensor, the second pressure sensor, the first expansion joint, and the second expansion joint are all connected to the control and monitoring system.

[0008] Furthermore, the shallow solid hydrate extraction area is located above the deep natural gas extraction area.

[0009] Furthermore, misalignment lines are provided at the central axis of the bottom and middle rock layers.

[0010] Furthermore, the first and second telescopic devices are two identical telescopic devices, and their vertical extension and retraction are controlled by a control and monitoring system.

[0011] Furthermore, the small oxygenation pump is simultaneously connected to the fourth ball valve, the fifth ball valve, the sixth ball valve, the seventh ball valve, the eighth ball valve, and the ninth ball valve.

[0012] Furthermore, the fourth ball valve is connected to the first gas flow meter and then to the outer pipe; the fifth ball valve is connected to the second gas flow meter and then to the outer pipe; the sixth ball valve is connected to the third gas flow meter and then to the outer pipe; the seventh ball valve is connected to the fourth gas flow meter and then to the outer pipe; the eighth ball valve is connected to the fifth gas flow meter and then to the outer pipe; and the ninth ball valve is connected to the sixth gas flow meter and then to the outer pipe.

[0013] Furthermore, the air generated by the small oxygenation pump enters the outer pipe and flows upward from the annulus between the outer and inner pipes, simulating the natural gas gas continuously decomposed from the hydrate during the upward return process of solid hydrate extraction under actual working conditions.

[0014] Furthermore, the natural gas in the natural gas storage tank is pressurized by a gas pressurization pump and measured by a seventh gas flow meter. It then enters the natural gas reservoir inside the rectangular tank from the second inlet of the tank. The natural gas flows from right to left within the natural gas reservoir and flows out of the tank outlet, eventually flowing into the natural gas storage tank for recycling.

[0015] Furthermore, the natural gas reservoir is filled with natural gas, simulating the presence of natural gas gas in the natural gas reservoir under actual operating conditions.

[0016] Furthermore, the water in the storage tank is pressurized by the second water pump and enters the water layer inside the rectangular box through the first inlet of the box body, which at this time simulates seawater under actual working conditions.

[0017] Furthermore, the first and second horizontal mining sections simulate actual working conditions for extracting solid hydrates and natural gas from the seabed through horizontal wells.

[0018] Furthermore, the shallow solid hydrate extraction zone and the deep natural gas extraction zone are used to simulate the extraction process under actual working conditions.

[0019] Furthermore, the first ball valve, second ball valve, third ball valve, fourth ball valve, fifth ball valve, sixth ball valve, seventh ball valve, eighth ball valve, ninth ball valve, tenth ball valve, and eleventh ball valve are existing technologies and will not be described in detail here.

[0020] Furthermore, the liquid flow meter, the first gas flow meter, the second gas flow meter, the third gas flow meter, the fourth gas flow meter, the fifth gas flow meter, the sixth gas flow meter, and the seventh gas flow meter are existing technologies and will not be described in detail here.

[0021] Furthermore, the first water pump, the small oxygenation pump, the second water pump, and the gas pressurization pump are existing technologies and will not be described in detail here.

[0022] Furthermore, the bottom of the gas-solid two-phase separator is equipped with a sand collection bucket (not shown in the figure) for recovering sand particles, which is existing technology and will not be described in detail here.

[0023] Furthermore, the first and second pressure sensors are used to measure the pressure changes before and after the skeleton breaks and collapses, which is existing technology and will not be described in detail here.

[0024] Furthermore, the control and monitoring system can simultaneously monitor pressure changes and control the expansion and contraction of the first and second expansion joints.

[0025] Furthermore, the first and second telescopic devices can achieve three levels of extension and retraction, that is, after extending to the longest position, they can retract downwards three times, or after retracting to the shortest position, they can extend upwards three times.

[0026] Furthermore, nylon particles with a density close to that of solid hydrates are provided in the shallow solid hydrate mining area. A solid hydrate layer is formed by mixing the nylon particles with the rock layer to simulate the solid hydrate layer under actual working conditions. The nylon particles are existing technology and will not be described in detail here.

[0027] Compared with the prior art, the advantages of the present invention are: (1) By setting up a loop to save resources, the measurement purpose can be achieved at the same time; (2) By setting up a first level mining section and a second level mining section, as well as water layer, mud layer, solid hydrate layer, middle rock layer, natural gas reservoir and bottom rock layer, the mining process of seabed gas fusion under actual working conditions can be actually simulated; (3) By setting up a control and monitoring system to control the contraction of the first expansion joint and the second expansion joint, the process of partial collapse and complete collapse of the skeleton under actual working conditions can be realistically simulated, and the simulation effect is good; (4) The present invention can realistically measure the partial collapse and complete collapse of the skeleton during the process of seabed gas fusion, and the measurement effect is good. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the device for measuring the impact of the fracture and collapse of the subsea dual-gas production framework on the well bottom, according to the present invention.

[0029] In the diagram: 1. Water-based drilling fluid storage tank; 2. First water pump; 3. First ball valve; 4. Liquid flow meter; 5. Second ball valve; 6. Sand additive; 7. Outlet; 8. Inlet; 9. Outer pipe; 10. Inner pipe; 11. First inlet of the tank; 12. Second water pump; 13. Third ball valve; 14. Water storage tank; 15. First gas flow meter; 16. Fourth ball valve; 17. Second gas flow meter; 18. Fifth ball valve; 19. Third gas flow meter; 20. Sixth ball valve; 21. Fourth gas flow meter; 22. Seventh ball valve; 23. Fifth gas flow meter; 24. Eighth ball valve; 25. Sixth gas flow meter; 26. Ninth ball valve; 27. Small oxygen pump; 28. Shallow solid hydrate extraction. 29. Extraction Head, 30. First Pressure Sensor, 31. First Horizontal Extraction Section, 32. Deep Natural Gas Extraction Area, 33. Drill Bit, 34. Extraction Perforation, 35. Second Pressure Sensor, 36. Second Horizontal Extraction Section, 37. Box Outlet, 38. Tenth Ball Valve, 39. First Expansion Joint, 40. Natural Gas Storage Tank, 41. Eleventh Ball Valve, 42. Second Expansion Joint, 43. Gas Pressurization Pump, 44. Seventh Gas Flow Meter, 45. Bottom Rock Layer, 46. Box Second Inlet, 47. Natural Gas Reservoir, 48. Middle Rock Layer, 49. Solid Hydrate Layer, 50. Control and Monitoring System, 51. Mud Layer, 52. Water Layer, 53. Rectangular Box, 54. Gas-Solid Two-Stage Separator. Detailed Implementation

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] like Figure 1As shown, this invention discloses a device for measuring the impact of a subsea dual-gas production system's framework fracture and collapse on the well bottom. The measuring device includes a water-based drilling fluid storage tank 1, a first water pump 2, a first ball valve 3, a liquid flow meter 4, a second ball valve 5, a sand additive 6, an outlet 7, an inlet 8, an outer pipe 9, an inner pipe 10, a housing with a first inlet 11, a second water pump 12, a third ball valve 13, a water storage tank 14, a first gas flow meter 15, a fourth ball valve 16, a second gas flow meter 17, a fifth ball valve 18, a third gas flow meter 19, a sixth ball valve 20, a fourth gas flow meter 21, a seventh ball valve 22, a fifth gas flow meter 23, an eighth ball valve 24, a sixth gas flow meter 25, a ninth ball valve 26, and a small... 27. Type of oxygenation pump, 28. Shallow solid hydrate mining area, 29. Mining head, 30. First pressure sensor, 31. First horizontal mining section, 32. Deep natural gas mining area, 33. Drill bit, 34. Mining perforation, 35. Second pressure sensor, 36. Second horizontal mining section, 37. Box outlet, 38. Tenth ball valve, 39. First expansion joint, 40. Natural gas storage tank, 41. Eleventh ball valve, 42. Second expansion joint, 43. Gas pressurization pump, 44. Seventh gas flow meter, 45. Bottom rock layer, 46. Second inlet of box, 47. Natural gas reservoir, 48. Middle rock layer, 49. Solid hydrate layer, 50. Control and monitoring system, 51. Mud layer, 52. Water layer, 53. Rectangular box, 54. Gas-solid two-phase separator; Water-based drilling fluid storage tank 1 is connected in sequence to first water pump 2, liquid flow meter 4, second ball valve 5, sand additive 6, and inlet 8; outlet 7 is connected in sequence to first ball valve 3, gas-solid separator 53, and water-based drilling fluid storage tank 1; water storage tank 14 is connected in sequence to third ball valve 13, second water pump 12, and first inlet 11 of the tank; tank outlet 37 is connected in sequence to tenth ball valve 38, natural gas storage tank 40, eleventh ball valve 41, gas pressurization pump 43, seventh gas flow meter 44, and second inlet 46 of the tank; the rectangular tank 53 is provided with water layer 52, mud layer 51, solid hydrate layer 49, middle rock layer 48, natural gas reservoir 47, and bottom rock layer 45 from top to bottom.

[0032] The purpose of the measuring device is to simulate the impact on the well bottom after partial and complete collapse of the seabed skeleton following the simultaneous extraction of solid hydrates and natural gas under actual working conditions.

[0033] The measuring device is divided into a first horizontal mining section 31 and a second horizontal mining section 36. The first horizontal mining section 31 is used to simulate the mining of shallow solid hydrates under actual working conditions, and the second horizontal mining section 36 is used to simulate the mining of deep natural gas under actual working conditions.

[0034] Within the measuring device, the small oxygenation pump 27 is simultaneously connected to the fourth ball valve 16, the fifth ball valve 18, the sixth ball valve 20, the seventh ball valve 22, the eighth ball valve 24, and the ninth ball valve 26. The fourth ball valve 16 is connected to the first gas flow meter 15 and then to the outer pipe 9; the fifth ball valve 18 is connected to the second gas flow meter 17 and then to the outer pipe 9; the sixth ball valve 20 is connected to the third gas flow meter 19 and then to the outer pipe 9; the seventh ball valve 22 is connected to the fourth gas flow meter 21 and then to the outer pipe 9; the eighth ball valve 24 is connected to the fifth gas flow meter 23 and then to the outer pipe 9; and the ninth ball valve 26 is connected to the sixth gas flow meter 25 and then to the outer pipe 9.

[0035] like Figure 1The diagram shows a schematic of a device for measuring the impact of a fractured and collapsed subsea gas-producing system on the well bottom. When measuring the partial collapse of the subsea gas-producing system, all ball valves are first closed. Then, the tenth ball valve 38, natural gas storage tank 40, eleventh ball valve 41, and gas pressurization pump 43 are opened sequentially. This pressurizes the natural gas in storage tank 40, and after being measured by the seventh gas flow meter 44, it enters the natural gas reservoir 47 through the second inlet 46 of the tank. The natural gas flows from right to left within the reservoir 47, eventually flowing out from the outlet 37 back to storage tank 40 for recycling. This simulates the natural gas reservoir under actual operating conditions. Next, the water tank 14, third ball valve 13, and second water pump 12 are opened. This pressurizes the water in storage tank 14, and after being pumped by the second water pump 12, it enters the water layer within the rectangular tank 53 through the first inlet 11 of the tank. This simulates seawater under actual operating conditions. Next, the water-based drilling fluid storage tank 1, the first water pump 2, the second ball valve 5, and the first ball valve 3 are opened sequentially. The drilling fluid in the water-based drilling fluid storage tank 1 is pressurized by the first water pump 2 and metered by the liquid flow meter 4 before entering the inner pipe 10 through inlet 8. The drilling fluid flows downwards within the inner pipe 10, with a portion flowing to the first horizontal production section 31 and the other portion flowing to the second horizontal production section 36. The drilling fluid flowing to the first horizontal production section 31 exits from the production head 29 into the shallow solid hydrate production area 28, where it is used to flush and extract the solid hydrates. The extracted solid hydrates, cuttings, and drilling fluid are finally returned through the annulus between the outer pipe 9 and the inner pipe 10. Drilling fluid flowing to the second level production section 36 exits from drill bit 33 into the deep natural gas production area 32 to extract natural gas from the natural gas reservoir 47. The extracted drilling fluid, natural gas, and reservoir cuttings are ultimately returned through the annulus between the outer pipe 9 and the inner pipe 10. The drilling fluid, natural gas, reservoir cuttings, and solid hydrates (replaced by nylon particles) extracted from the first level production section 31 and the second level production section 36 converge during their upward return through the annulus. At this time, the small oxygen pump 27, the fourth ball valve 16, the fifth ball valve 18, the sixth ball valve 20, the seventh ball valve 22, the eighth ball valve 24, and the ninth ball valve 26 are opened in sequence. The gas generated by the small oxygen pump 27 is injected into the annulus between the outer pipe 9 and the inner pipe 10 through the outer pipe 9. The amount of air intake is controlled by adjusting the opening degree of the fourth ball valve 16, the fifth ball valve 18, the sixth ball valve 20, the seventh ball valve 22, the eighth ball valve 24, and the ninth ball valve 26. At this time, the gas generated by the decomposition of solid hydrate under actual working conditions is simulated. Finally, the gas generated by the small oxygen pump, drilling fluid, natural gas, reservoir cuttings, and solid hydrate (replaced by nylon particles) flow out from the outlet 7 to the gas-solid two-phase separator 54 for separation.The separated drilling fluid flows into water-based drilling fluid storage tank 1 for recycling. The separated natural gas and gas generated by the small oxygen pump are discharged into the atmosphere. The separated rock cuttings and solid hydrates (replaced by nylon particles) enter the sand collection bucket (not shown in the figure) for recovery. After a period of circulation, once the values ​​of the first pressure sensor 30 and the second pressure sensor 35 displayed on the control and monitoring system 50 tend to stabilize, the control and monitoring system 50 controls the first expansion joint 39 to remain unchanged, while the second expansion joint 42 contracts downwards once every 2 minutes, for a total of three contractions. The control and monitoring system 50 records the changes in the values ​​of the first pressure sensor 30 and the second pressure sensor 35. At this time, the collapse of part of the subsea dual-gas production framework after breakage is simulated under actual working conditions.

[0036] When measuring the complete collapse of the subsea dual-gas extraction system frame after breakage, repeat the above steps; since most of the measurement steps are the same as those described above, they will not be repeated here. Only the different parts will be described in detail. After a period of time, once the values ​​of the first pressure sensor 30 and the second pressure sensor 35 displayed on the control and monitoring system 50 tend to stabilize, the control and monitoring system 50 controls the first expansion joint 39 and the second expansion joint 42 to contract downwards simultaneously once every 2 minutes, for a total of three contractions. The control and monitoring system 50 records the changes in the values ​​of the first pressure sensor 30 and the second pressure sensor 35, at which point the actual collapse of the subsea dual-gas extraction system frame after breakage is simulated.

[0037] The first pressure sensor displays data values. The second pressure sensor displays the value. After the framework of the subsea dual gas extraction system was broken, part of it collapsed. The second expansion joint retracts for the first time. 2.06MPa 2.11MPa The second expansion joint contracts for the second time. 2.04MPa 2.08MPa The second expansion joint retracts for the third time. 2.03MPa 2.07MPa The entire framework of the subsea dual-gas extraction system collapsed after being broken. The first and second expansion joints simultaneously contract for the first time. 2.02MPa 2.07MPa The first and second expansion joints simultaneously contract for the second time. 2.0MPa 2.04MPa The first and second expansion joints simultaneously contract for the third time. 1.99MPa 2.01MPa As shown in the table above, in the case of partial collapse: with the second expansion joint contracting three times, the value displayed by the second pressure sensor after contraction is more unstable and fluctuates more significantly compared to the value displayed by the first sensor; that is, under actual operating conditions, the impact of the fracture of the dual-gas extraction framework on the deep natural gas extraction area is greater. In the case of complete collapse: with the simultaneous contraction of the first and second expansion joints, the value displayed by the first pressure sensor is more stable than the value displayed by the second pressure sensor; that is, the value of the second pressure sensor fluctuates more greatly. Therefore, under actual operating conditions, the impact of the fracture of the dual-gas extraction framework on the deep natural gas extraction area is greater.

[0038] This invention can realistically simulate the extraction process of submarine dual gas extraction under actual working conditions, with high simulation fidelity. Through the control and monitoring system 50, it records the pressure changes in the extraction area when the submarine dual gas extraction framework partially collapses and completely collapses. This will provide specific guidance for improving extraction efficiency and ensuring safe and stable extraction under complex working conditions such as submarine dual gas extraction.

Claims

1. A device for measuring the impact of a subsea dual-gas production system's framework fracture and collapse on the well bottom, characterized in that: The measuring device includes a water-based drilling fluid storage tank (1), a first water pump (2), a first ball valve (3), a liquid flow meter (4), a second ball valve (5), a sand additive (6), an outlet (7), an inlet (8), an outer pipe (9), an inner pipe (10), a first inlet (11) of the tank body, a second water pump (12), a third ball valve (13), a water storage tank (14), a first gas flow meter (15), a fourth ball valve (16), a second gas flow meter (17), a fifth ball valve (18), a third gas flow meter (19), a sixth ball valve (20), a fourth gas flow meter (21), a seventh ball valve (22), a fifth gas flow meter (23), an eighth ball valve (24), a sixth gas flow meter (25), a ninth ball valve (26), a small oxygenation pump (27), and shallow solid hydrate mining. Zone (28), mining head (29), first pressure sensor (30), first horizontal mining section (31), deep natural gas mining zone (32), drill bit (33), mining perforation (34), second pressure sensor (35), second horizontal mining section (36), box outlet (37), tenth ball valve (38), first expansion joint (39), natural gas storage tank (40), eleventh ball valve (41), second expansion joint (42), gas pressurization pump (43), seventh gas flow meter (44), bottom rock layer (45), box second inlet (46), natural gas reservoir (47), middle rock layer (48), solid hydrate layer (49), control and monitoring system (50), mud layer (51), water layer (52), rectangular box (53), gas-solid two-phase separator (54); The water-based drilling fluid storage tank (1) is connected in sequence to the first water pump (2), liquid flow meter (4), second ball valve (5), sand additive (6), and inlet (8); the outlet (7) is connected in sequence to the first ball valve (3), gas-solid separator (53), and water-based drilling fluid storage tank (1); the water storage tank (14) is connected in sequence to the third ball valve (13), second water pump (12), and first inlet (11) of the box; the box outlet (37) is connected in sequence to the tenth ball valve (38), natural gas storage tank (40), eleventh ball valve (41), gas pressurization pump (43), seventh gas flow meter (44), and second inlet (46) of the box; the rectangular box (53) is provided with water layer (52), mud layer (51), solid hydrate layer (49), middle rock layer (48), natural gas reservoir (47), and bottom rock layer (45) from top to bottom.

2. The device for measuring the impact of the collapse of a subsea dual-gas production system on the well bottom as described in claim 1, characterized in that: The rectangular box (53) is also equipped with an outer pipe (9), an inner pipe (10), a shallow solid hydrate mining area (28), a mining head (29), a first pressure sensor (30), a first horizontal mining section (31), a deep natural gas mining area (32), a drill bit (33), a mining perforation (34), a second pressure sensor (35), a second horizontal mining section (36), a first expansion joint (39), and a second expansion joint (42).

3. The device for measuring the impact on the well bottom after the collapse of a subsea dual-gas production system according to claim 1, characterized in that: The first expansion joint (39) and the second expansion joint (42) are located at the bottom of the rectangular box (53). They are two identical expansion joints and are arranged symmetrically. One end of the first expansion joint (39) and the second expansion joint (42) are fixed to the bottom of the rectangular box (53) by welding, and the other end supports the bottom rock layer (45).

4. The device for measuring the impact on the well bottom after the collapse of a subsea dual-gas production system according to claim 1, characterized in that: The first pressure sensor (30), the second pressure sensor (35), the first expansion joint (39), and the second expansion joint (42) are all connected to the control and monitoring system (50).

5. The device for measuring the impact on the well bottom after the collapse of a subsea dual-gas production system according to claim 1, characterized in that: The shallow solid hydrate extraction area (28) is located above the deep natural gas extraction area (32).

6. The device for measuring the impact on the well bottom after the collapse of a subsea dual-gas production system according to claim 1, characterized in that: The bottom rock layer (45) and the middle rock layer (48) are provided with misalignment lines at their central axes.

7. The device for measuring the impact on the well bottom after the collapse of the subsea dual-gas production framework according to claim 4, characterized in that: The first telescopic device (39) and the second telescopic device (42) are two identical telescopic devices, which are controlled to extend and retract vertically by the control and monitoring system (50).

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