Underwater automatic gas production device

Abstract

The invention relates to the technical field of natural gas extraction, and discloses an underwater automatic gas extraction device which comprises a base, a gas-liquid separation tank and membrane separation equipment, the gas-liquid separation tank and the membrane separation equipment are mounted on the upper surface of the base, and a nitrogen storage box is mounted on the upper surface of the base; a filtering and defoaming cylinder is arranged on one side of the gas-liquid separation tank, is mounted on the upper surface of the base, and comprises a fixed half cylinder. The underwater automatic gas production device can effectively intercept impurity objects contained in mixed gas-liquid substances, meanwhile, the mixed gas-liquid substances with foams can be subjected to defoaming treatment, the follow-up treatment burden of the gas-liquid separation tank is relieved, the separation efficiency of the gas-liquid separation tank is improved, meanwhile, residual substances in the filtering and defoaming barrel body are conveniently cleaned, and the practicability of the underwater automatic gas production device is improved. And after cleaning, air in the filtering and defoaming barrel can be discharged, so that the influence of external air on mixed gas-liquid substances is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas extraction, and in particular to an underwater automatic gas extraction device. Background Art

[0002] Natural gas refers to all gases that exist naturally in nature, including gases formed by various natural processes in the atmosphere, hydrosphere and lithosphere. At present, natural gas has become an indispensable fuel for people. The deeper the gas well, the greater the amount of water deposited in the gas well. The natural gas is buried underwater, resulting in a decrease in the liquid carrying capacity of the gas well, making it impossible to achieve self-flowing gas production with liquid. Some gas wells with large water production have stopped production due to liquid accumulation. Currently, natural gas is extracted by underwater gas production, which includes water drainage gas production technology.

[0003] A fully automatic intelligent drainage and gas production equipment is provided through application number CN202320905625.7. In the article, a filter is set to filter out mud and rock particles in the water to prevent mud and rock particles from mixing into the gas-liquid separation tank and damaging the high-pressure water pump, thereby improving the protection of the high-pressure water pump. By installing a plate-fin heat exchanger, the coolant in the liquid cooling pipe is circulated and heat exchanged through the water pump and the plate-fin heat exchanger, so that the coolant can always maintain a low temperature, thereby improving the cooling effect and reducing the time consumption caused by replacing the coolant.

[0004] It can be seen from the above literature that although the impurities contained in the gas-liquid mixture are separated by the filter, the gas-liquid mixture is a long-term discharge process, and a single filter has a heavy burden on its separation. At the same time, the entire pipeline is in a closed state, and the filter cannot be effectively cleaned, which is easy to cause blockage. At the same time, although larger impurities and smaller substances can be separated at the same time, it is easy to cause larger impurities to block the mesh, resulting in poor subsequent separation effect and the separation efficiency of the subsequent gas-liquid separation tank.

[0005] At the same time, nitrogen is input into the well pipe as an inert gas and used as a pressurized gas. It will enter the subsequent gas-liquid separation tank along with the gas-liquid separation material. After the gas-liquid separation, the nitrogen contained in the natural gas will be input into the discharge pipeline, affecting the purity of the natural gas.

[0006] Based on this, it is necessary to propose an underwater automatic gas collection device. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an underwater automatic gas extraction device, which has the advantages of being able to effectively separate impurities contained in gas-liquid mixtures and at the same time improve the purity of natural gas, thereby solving the problems raised in the background technology.

[0008] The present invention provides the following technical solution: an underwater automatic gas extraction device, comprising a base, a gas-liquid separation tank and a membrane separation device:

[0009] A gas-liquid separation tank and a membrane separation device are installed on the upper surface of the base, and a nitrogen storage box is installed on the upper surface of the base;

[0010] A filtering and defoaming cylinder is provided on one side of the gas-liquid separation tank, and the filtering and defoaming cylinder is installed on the upper surface of the base. The filtering and defoaming cylinder includes a fixed semi-cylinder, and a movable semi-cylinder is attached to one side of the fixed semi-cylinder. Circular interlocking blocks are sleeved on the surfaces of both ends of the fixed semi-cylinder and the movable semi-cylinder. Three groups of filter plates are installed inside the fixed semi-cylinder, and a U-shaped output pipe with a nozzle is installed on the upper surface of the fixed semi-cylinder. The nozzle part of the U-shaped output pipe with a nozzle is installed inside the filtering and defoaming cylinder. A nitrogen input pipe is installed at one end of the upper surface of the fixed semi-cylinder, and an air exhaust pipe is installed at the other end of the upper surface of the fixed semi-cylinder.

[0011] Preferably, a mixed gas output pipe is installed at the upper end of the gas-liquid separation tank, and the other end of the mixed gas output pipe is installed at the end of the membrane separation device. A nitrogen discharge pipe is installed at the other end of the membrane separation device, and the other end of the nitrogen discharge pipe is installed at the side of the nitrogen storage box. Valves 7 are installed at both ends of the nitrogen discharge pipe. A natural gas discharge pipe is installed at the upper end of the membrane separation device, and a valve 8 is installed between the natural gas discharge pipes.

[0012] Preferably, a well pipe is installed inside the base, a delivery pipe is fixedly connected inside the well pipe, a nitrogen output pipe is fixedly connected to one side of the well pipe, and a mixed output pipe is fixedly connected to the other side of the well pipe, and the mixed output pipe is communicated with the delivery pipe through a pipeline.

[0013] Preferably, the other end of the mixing output pipe is fixedly connected to the filtering and defoaming cylinder, a valve ten is installed between the delivery pipes, and a valve one is installed between the mixing output pipes.

[0014] Preferably, a second high-pressure air pump is installed on the upper surface of the base, and the second high-pressure air pump is connected to the nitrogen storage box through a pipeline. The other end of the second high-pressure air pump is connected to the nitrogen output pipe, and a second valve is installed between the nitrogen output pipes.

[0015] Preferably, a connecting pipe is installed at the other end of the filtering and defoaming cylinder, the other end of the connecting pipe is installed with the gas-liquid separation tank, and a valve six is ​​installed between the connecting pipes.

[0016] Preferably, a high-pressure air pump 1 is connected to the side of the nitrogen storage box through a pipeline, the other end of the high-pressure air pump 1 is installed with the end of the nitrogen input pipe, and a valve 4 is installed between the nitrogen input pipes.

[0017] Preferably, a defoaming agent input pipe is installed in the middle of the U-shaped output pipe with a nozzle, a valve three is installed between the defoaming agent input pipes, and a valve five is installed between the air exhaust pipes.

[0018] Preferably, a replenishing pipe is installed on the upper surface of the nitrogen storage box, and a valve nine is installed between the replenishing pipes.

[0019] Preferably, the filter holes of the three groups of filter plates have different diameters, and the three groups of filter plates are arranged from left to right in descending order of diameter.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When the filtering and defoaming cylinder of this underwater automatic gas extraction device is working, the movable half-cylinder and the fixed half-cylinder are combined, and two groups of circular interlocking blocks are sleeved on the outer surfaces of both ends of the combined movable half-cylinder and the fixed half-cylinder. At this time, the external defoaming agent is connected to the end of the defoaming agent input pipe through a pipeline, and the mixed gas and liquid substances are input into the filtering and defoaming cylinder. The mixed gas and liquid substances pass through three groups of filter plates with different apertures to effectively intercept impurities in the mixed gas and liquid substances. At the same time, the defoaming agent is sprayed on the mixed gas and liquid substances through the nozzle carried by the U-shaped output pipe with a nozzle, and the foam generated is eliminated for the second time. When it is necessary to clean the inside of the filtering and defoaming cylinder, the circular interlocking blocks are moved to both sides. At this time, the movable half-cylinder can be removed to expose the inside of the filtering and defoaming cylinder. The structure can clean the inside of the filter and defoamer cylinder. After the cleaning is completed, it is assembled in the above manner. At this time, nitrogen is introduced into the inside of the filter and defoamer cylinder through the nitrogen inlet pipe to squeeze the air inside the filter and defoamer cylinder, so that the air inside the filter and defoamer cylinder is discharged through the air exhaust pipe, thereby avoiding the subsequent mixing of air with the mixed gas-liquid substances. The setting of this structure can effectively intercept the impurities contained in the mixed gas-liquid substances, and at the same time can defoam the mixed gas-liquid substances with foam, reduce the subsequent processing burden of the gas-liquid separation tank, improve the separation efficiency of the gas-liquid separation tank, and at the same time facilitate the cleaning of the residual substances in the filter and defoamer cylinder, and the air inside the filter and defoamer cylinder can be discharged after cleaning, reducing the influence of external air on the mixed gas-liquid substances.

[0022] 2. In this underwater automatic gas production device, when the mixed gas-liquid substances enter the gas-liquid separation tank for separation, the separated natural gas contains a high content of nitrogen. At this time, the mixed gas enters the membrane separation device through the mixed gas output pipe, and the nitrogen contained in the natural gas is separated by the membrane separation device. The separated nitrogen is input into the nitrogen storage box through the nitrogen discharge pipe for storage so as to be used again. The setting of this structure can effectively separate the used nitrogen and put it into use again after separation, thereby reducing the input amount of nitrogen, and at the same time can ensure the normal use of gas production and improve the purity of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0025] Figure 2 For the present invention Figure 1 Rear view structure diagram;

[0026] Figure 3 This is a schematic diagram of the structure of the well pipe part of the present invention;

[0027] Figure 4 This is a schematic diagram of the split structure of the filtering and defoaming cylinder of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the filtering and defoaming cylinder of the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Base; 110. Well pipe; 111. Delivery pipe; 1111. Valve 10; 112. Mixing output pipe; 1121. Valve 1; 113. Nitrogen output pipe; 1131. Valve 2;

[0031] 2. Filter and defoamer cylinder; 210. Fixed half cylinder; 220. Movable half cylinder; 230. Round fitting block; 240. Filter plate; 250. U-shaped output pipe with nozzle; 251. Defoamer input pipe; 2511. Valve three; 260. Nitrogen input pipe; 261. Valve four; 270. Air discharge pipe; 271. Valve five;

[0032] 3. Gas-liquid separation tank; 310. Mixed gas output pipe; 320. Connecting pipe; 321. Valve six;

[0033] 4. Membrane separation equipment; 410. Nitrogen discharge pipe; 411. Valve seven; 420. Natural gas discharge pipe; 421. Valve eight;

[0034] 5. Nitrogen storage box; 510. Supplementary pipe; 511. Valve nine; 520. High-pressure air pump one; 530. High-pressure air pump two. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Natural gas refers to all gases that exist naturally in nature, including gases formed by various natural processes in the atmosphere, hydrosphere, and lithosphere. At present, natural gas has become an indispensable fuel for people. The deeper the gas well, the greater the amount of water deposited in the gas well. The natural gas is buried underwater, resulting in a decrease in the liquid carrying capacity of the gas well, making it impossible to achieve self-flowing gas production with liquid. Some gas wells with large water production have stopped production due to liquid accumulation. Currently, natural gas is extracted by underwater gas production, which includes water drainage gas production technology.

[0037] The water drainage gas production technology includes small oil pipe water gas production, bubble drainage gas production, gas lift water drainage gas production, plunger water drainage gas production, mechanical pumping water drainage gas production, electric submersible pump water drainage gas production, tubing water drainage gas production and jet pump water drainage gas production.

[0038] The principle of bubble drainage gas production is to inject a surfactant (foaming agent) into the well. After the water at the bottom of the well contacts the foaming agent, a large amount of low-density water-containing foam is generated with the help of the stirring of the natural gas flow. These foams are carried from the bottom of the well to the ground with the air flow, thereby achieving the purpose of clearing the liquid at the bottom of the well. The process is as follows: Injecting foaming agent: injecting a certain amount of surfactant (foaming agent) into the well; generating foam: after the water at the bottom of the well contacts the foaming agent, a large amount of low-density water-containing foam is generated with the help of the stirring of the natural gas flow;

[0039] Carrying accumulated liquid: The generated foam is carried from the bottom of the well to the ground with the air flow, so as to achieve the purpose of clearing the accumulated liquid at the bottom of the well; Preventing foam from being brought into ground equipment: After the natural gas carrying the bubble flow rises to the ground, in order to prevent the foam from being brought into the ground process equipment and affecting normal production, it is necessary to inject a defoaming agent before the pipeline is added to the equipment to remove the foam. It has the following advantages: The generated water-containing foam reduces the density of the gas-liquid mixture, thereby reducing friction loss and gravity gradient, and improving gas production efficiency. It is suitable for various types of natural gas wells, especially those with insufficient liquid carrying capacity.

[0040] A fully automatic intelligent drainage and gas production equipment is provided through application number CN202320905625.7. In the article, a filter is set to filter out mud and rock particles in the water to prevent mud and rock particles from mixing into the gas-liquid separation tank and damaging the high-pressure water pump, thereby improving the protection of the high-pressure water pump. By installing a plate-fin heat exchanger, the coolant in the liquid cooling pipe is circulated and heat exchanged through the water pump and the plate-fin heat exchanger, so that the coolant can always maintain a low temperature, thereby improving the cooling effect and reducing the time consumption caused by replacing the coolant.

[0041] In this device, impurities contained in the gas-liquid mixture are filtered through only one set of filters. Large impurities are mixed with smaller impurities, which can easily lead to blockage of the filter mesh. At the same time, they are not cleaned for a long time, resulting in the pipeline being unable to circulate the gas-liquid mixture normally, affecting the gas production process. At the same time, although the input of nitrogen can speed up the circulation of the gas-liquid mixture, the nitrogen is still mixed with the natural gas after passing through the gas-liquid separation tank, which in turn affects the purity of the natural gas. At the same time, the continuous input of nitrogen results in a large consumption of nitrogen.

[0042] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , an underwater automatic gas collection device, comprising a base 1, a gas-liquid separation tank 3 and a membrane separation device 4:

[0043] A gas-liquid separation tank 3 and a membrane separation device 4 are installed on the upper surface of the base 1, and a nitrogen storage box 5 is installed on the upper surface of the base 1;

[0044] A filtering and defoaming cylinder 2 is provided on one side of the gas-liquid separation tank 3, and the filtering and defoaming cylinder 2 is installed on the upper surface of the base 1. The filtering and defoaming cylinder 2 includes a fixed semi-cylinder 210, and a movable semi-cylinder 220 is attached to one side of the fixed semi-cylinder 210. Circular interlocking blocks 230 are sleeved on the surfaces of both ends of the fixed semi-cylinder 210 and the movable semi-cylinder 220. Three groups of filter plates 240 are installed inside the fixed semi-cylinder 210, and a U-shaped output pipe 250 with a nozzle is installed on the upper surface of the fixed semi-cylinder 210. The nozzle part of the U-shaped output pipe 250 with a nozzle is installed inside the filtering and defoaming cylinder 2, a nitrogen input pipe 260 is installed at one end of the upper surface of the fixed semi-cylinder 210, and an air exhaust pipe 270 is installed at the other end of the upper surface of the fixed semi-cylinder 210.

[0045] The movable semi-cylinder 220 and the fixed semi-cylinder 210 are combined, and two groups of circular interlocking blocks 230 are sleeved on the outer surfaces of both ends of the combined movable semi-cylinder 220 and the fixed semi-cylinder 210, and the mixed gas-liquid substances are input into the interior of the filtering and defoaming cylinder 2. The mixed gas-liquid substances pass through three groups of filter plates 240 with different apertures to effectively intercept impurities in the mixed gas-liquid substances. At the same time, the defoaming agent is sprayed on the mixed gas-liquid substances through the nozzle carried by the U-shaped output pipe 250 with a nozzle, and the foam generated by it is eliminated for the second time. To clean the inside of the filter and defoamer cylinder 2, move the circular engaging blocks 230 to both sides. At this time, the movable semi-cylinder 220 can be removed to expose the internal structure of the filter and defoamer cylinder 2, and the inside of the filter and defoamer cylinder 2 can be cleaned. After the cleaning is completed, assemble it according to the above method. At this time, nitrogen is introduced into the inside of the filter and defoamer cylinder 2 through the nitrogen input pipe 260 to squeeze the air inside the filter and defoamer cylinder 2, so that the air inside the filter and defoamer cylinder 2 is discharged through the air exhaust pipe 270, thereby avoiding the subsequent mixing of air with the mixed gas and liquid substances.

[0046] As a preferred technical solution of the present invention, a mixed gas output pipe 310 is installed at the upper end of the gas-liquid separation tank 3, and the other end of the mixed gas output pipe 310 is installed at the end of the membrane separation device 4. A nitrogen discharge pipe 410 is installed at the other end of the membrane separation device 4, and the other end of the nitrogen discharge pipe 410 is installed at the side of the nitrogen storage box 5. Valves 7 411 are installed at both ends of the nitrogen discharge pipe 410. A natural gas discharge pipe 420 is installed at the upper end of the membrane separation device 4, and a valve 8 421 is installed between the natural gas discharge pipes 420.

[0047] When the mixed gas-liquid substances enter the gas-liquid separation tank 3 for separation, the separated natural gas contains a relatively high content of nitrogen. At this time, the mixed gas enters the membrane separation device 4 through the mixed gas output pipe 310, and the nitrogen contained in the natural gas is separated by the membrane separation device 4. The separated nitrogen is input into the nitrogen storage box 5 through the nitrogen discharge pipe 410 for storage so as to be used again.

[0048] As a preferred technical solution of the present invention, a well pipe 110 is installed inside the base 1, and a delivery pipe 111 is fixedly connected inside the well pipe 110, a nitrogen output pipe 113 is fixedly connected to one side of the well pipe 110, and a mixed output pipe 112 is fixedly connected to the other side of the well pipe 110, and the mixed output pipe 112 is communicated with the delivery pipe 111 through a pipeline.

[0049] A certain amount of foaming agent can be introduced into the well pipe 110 through the injection pipe 111, so that after the water accumulated at the bottom of the well contacts the foaming agent, a large amount of low-density water-containing foam is generated with the help of the stirring of the natural gas flow. At this time, nitrogen is input into the well through the nitrogen output pipe 113, so that the gas-liquid mixture can enter the mixing output pipe 112.

[0050] As a preferred technical solution of the present invention, the other end of the mixing output pipe 112 is fixedly connected to the filtering and defoaming cylinder 2, a valve 1111 is installed between the delivery pipes 111, and a valve 1121 is installed between the mixing output pipes 112.

[0051] The mixed solution is transported into the filtering and defoaming cylinder 2 through the mixing output pipe 112 for filtering and defoaming treatment.

[0052] As a preferred technical solution of the present invention, a high-pressure air pump 530 is installed on the upper surface of the base 1. The high-pressure air pump 530 is connected to the nitrogen storage box 5 through a pipeline. The other end of the high-pressure air pump 530 is connected to the nitrogen output pipe 113. A valve 1131 is installed between the nitrogen output pipe 113.

[0053] The nitrogen in the nitrogen storage box 5 is extracted by the high-pressure air pump 530 and input into the nitrogen output pipe 113 .

[0054] As a preferred technical solution of the present invention, a connecting pipe 320 is installed at the other end of the filtering and defoaming cylinder 2, and the other end of the connecting pipe 320 is installed with the gas-liquid separation tank 3, and a valve 6 321 is installed between the connecting pipes 320.

[0055] The gas-liquid mixed material filtered inside the filtering and defoaming cylinder 2 is sent to the inside of the gas-liquid separation tank 3 through the connecting pipe 320 for gas-liquid separation.

[0056] As a preferred technical solution of the present invention, the side of the nitrogen storage box 5 is connected to a high-pressure air pump 520 through a pipeline, the other end of the high-pressure air pump 520 is installed with the end of the nitrogen input pipe 260, and a valve 4 261 is installed between the nitrogen input pipe 260.

[0057] The nitrogen inside the nitrogen storage box 5 is extracted through the operation of a high-pressure air pump 520, and is delivered to the interior of the filter and defoaming cylinder 2 through a nitrogen input pipe 260, so that the air inside the filter and defoaming cylinder 2 can be discharged later.

[0058] As a preferred technical solution of the present invention, a defoaming agent input pipe 251 is installed in the middle position of the U-shaped output pipe 250 with a nozzle, a valve three 2511 is installed between the defoaming agent input pipes 251, and a valve five 271 is installed between the air exhaust pipes 270.

[0059] The external defoamer is connected to the end of the defoamer input pipe 251 through a pipeline. At this time, the defoamer enters the interior of the U-shaped output pipe 250 with a nozzle through the defoamer input pipe 251 and performs defoaming treatment through its nozzle.

[0060] As a preferred technical solution of the present invention, a supplementary pipe 510 is installed on the upper surface of the nitrogen storage box 5, and a valve 511 is installed between the supplementary pipes 510.

[0061] By setting a gas content monitoring sensor inside the nitrogen storage box 5, the nitrogen content inside the nitrogen storage box 5 is monitored in real time. If the content decreases, a certain amount of nitrogen can be injected into the nitrogen storage box 5 through the replenishing pipe 510 to ensure normal gas collection.

[0062] As a preferred technical solution of the present invention, the filter holes of the three groups of filter plates 240 have different diameters, and the three groups of filter plates 240 are arranged from left to right in descending order of diameter.

[0063] Among them: the valves involved are used to control the flow of the entire pipeline, thereby ensuring the overall gas production.

[0064] The working process is as follows: a foaming agent is added into the injection pipe 111. When the foaming agent reacts with the accumulated water in the well, an appropriate amount of defoaming agent is added into the well for defoaming treatment. At this time, the nitrogen inside the nitrogen storage box 5 is extracted by the operation of the high-pressure air pump 530, and the nitrogen enters the well through the nitrogen output pipe 113. At this time, the gas-liquid mixture enters the interior of the filter defoaming cylinder 2 through the mixed output pipe 112, and is filtered and subjected to secondary defoaming treatment inside the filter defoaming cylinder 2. After the treatment, the gas-liquid mixture enters the interior of the gas-liquid separation tank 3, and the gas-liquid mixture is separated into gas and liquid by the gas-liquid separation tank 3. After the separation is completed, the gas enters the interior of the membrane separation device 4 through the mixed gas output pipe 310, and the nitrogen contained in the gas is separated by the membrane separation device 4, and the natural gas is discharged through the natural gas discharge pipe 420, and the nitrogen is sent back to the interior of the nitrogen storage box 5 through the nitrogen discharge pipe 410 for reuse.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underwater automatic gas extraction device, comprising a base (1), a gas-liquid separation tank (3) and a membrane separation device (4), characterized in that: A gas-liquid separation tank (3) and a membrane separation device (4) are installed on the upper surface of the base (1), and a nitrogen storage box (5) is installed on the upper surface of the base (1); A filtering and defoaming cylinder (2) is provided on one side of the gas-liquid separation tank (3). The filtering and defoaming cylinder (2) is mounted on the upper surface of the base (1). The filtering and defoaming cylinder (2) comprises a fixed semi-cylinder (210). A movable semi-cylinder (220) is attached to one side of the fixed semi-cylinder (210). Circular interlocking blocks (230) are sleeved on the surfaces of both ends of the fixed semi-cylinder (210) and the movable semi-cylinder (220). 0) are installed inside three groups of filter plates (240), a U-shaped output pipe (250) with a nozzle is installed on the upper surface of the fixed semi-cylinder (210), the nozzle part of the U-shaped output pipe (250) with a nozzle is installed inside the filtering and defoaming cylinder (2), a nitrogen input pipe (260) is installed on one end of the upper surface of the fixed semi-cylinder (210), and an air exhaust pipe (270) is installed on the other end of the upper surface of the fixed semi-cylinder (210).

2. An underwater automatic gas extraction device according to claim 1, characterized in that: A mixed gas output pipe (310) is installed at the upper end of the gas-liquid separation tank (3), and the other end of the mixed gas output pipe (310) is installed at the end of the membrane separation device (4). A nitrogen discharge pipe (410) is installed at the other end of the membrane separation device (4), and the other end of the nitrogen discharge pipe (410) is installed at the side of the nitrogen storage box (5). Valves seven (411) are installed at both ends of the nitrogen discharge pipe (410). A natural gas discharge pipe (420) is installed at the upper end of the membrane separation device (4), and a valve eight (421) is installed between the natural gas discharge pipes (420).

3. An underwater automatic gas extraction device according to claim 1, characterized in that: A well pipe (110) is installed inside the base (1), a delivery pipe (111) is fixedly connected inside the well pipe (110), a nitrogen output pipe (113) is fixedly connected to one side of the well pipe (110), a mixed output pipe (112) is fixedly connected to the other side of the well pipe (110), and the mixed output pipe (112) is communicated with the delivery pipe (111) through a pipeline.

4. An underwater automatic gas extraction device according to claim 3, characterized in that: The other end of the mixing output pipe (112) is fixedly connected to the filtering and defoaming cylinder (2), a valve ten (1111) is installed between the delivery pipes (111), and a valve one (1121) is installed between the mixing output pipes (112).

5. The underwater automatic gas extraction device according to claim 1, characterized in that: A second high-pressure air pump (530) is installed on the upper surface of the base (1), and the second high-pressure air pump (530) is connected to the nitrogen storage box (5) through a pipeline. The other end of the second high-pressure air pump (530) is connected to the nitrogen output pipe (113), and a second valve (1131) is installed between the nitrogen output pipe (113).

6. The underwater automatic gas collection device according to claim 1, characterized in that: A connecting pipe (320) is installed at the other end of the filtering and defoaming cylinder (2), and the other end of the connecting pipe (320) is installed with the gas-liquid separation tank (3), and a valve six (321) is installed between the connecting pipes (320).

7. The underwater automatic gas collection device according to claim 1, characterized in that: The side of the nitrogen storage box (5) is connected to a high-pressure air pump (520) through a pipeline, and the other end of the high-pressure air pump (520) is installed with the end of the nitrogen input pipe (260), and a valve four (261) is installed between the nitrogen input pipe (260).

8. The underwater automatic gas collection device according to claim 1, characterized in that: A defoaming agent input pipe (251) is installed at the middle position of the U-shaped output pipe with a nozzle (250), a valve three (2511) is installed between the defoaming agent input pipes (251), and a valve five (271) is installed between the air exhaust pipes (270).

9. The underwater automatic gas extraction device according to claim 1, characterized in that: A supplementary pipe (510) is installed on the upper surface of the nitrogen storage box (5), and a valve nine (511) is installed between the supplementary pipes (510).

10. The underwater automatic gas collection device according to claim 1, characterized in that: The filter holes of the three groups of filter plates (240) have different diameters, and the three groups of filter plates (240) are arranged from left to right in order from large to small diameters.

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