A salt cavern repository air block solution corrosion reducing chambering apparatus and method

Abstract

This invention relates to a cavity-forming device and method for reducing corrosion in salt cavern storage using air-insulated solvents. The device includes a production casing, an outer cavity-forming tube, an inner cavity-forming tube, an interface meter, a water injection mechanism, a gas injection mechanism, and a treatment mechanism. The production casing is vertically fixedly installed within the cavity. The outer cavity-forming tube is vertically fixedly installed inside the outer cavity-forming tube, with its upper end extending beyond the upper end of the production casing and forming a closed outer annular cavity with the production casing. The inner cavity-forming tube is vertically fixedly installed inside the outer cavity-forming tube, with its upper end extending beyond the upper end of the outer cavity-forming tube and closed, forming a closed middle annular cavity with the outer cavity-forming tube. The water injection mechanism is connected to the upper end of the inner cavity-forming tube via a pipeline, the gas injection mechanism is connected to the upper end of the outer annular cavity via a pipeline, and the treatment mechanism is connected to the upper end of the middle annular cavity via a pipeline. This invention can effectively reduce the degree of casing corrosion during air-insulated cavity formation, ensuring that the integrity and sealing of the tubing meet the safety requirements for storing hydrocarbon gases or liquids.

Description

Technical Field

[0001] This invention relates to the field of petroleum and natural gas engineering technology, specifically to a cavity-forming device and method for reducing corrosion in salt cavern storage by air-insulating solvents. Background Technology

[0002] Currently, underground salt cavern storage primarily employs the water-dissolution method for cavity construction. This process involves injecting solvents such as diesel, nitrogen, or liquefied petroleum gas. Utilizing the density difference between the solvent and the brine, a solvent layer of a certain thickness is formed at the top of the salt cavity, preventing water from dissolving upwards, protecting the top of the cavity, and promoting lateral expansion. During cavity construction, the cavity is divided into different sections from bottom to top, each section completed separately to control the cavity's shape.

[0003] In China, most cavity construction involves layered salt rock, presenting complex geological conditions with numerous salt rock interlayers and low quality, making cavity construction challenging. To better control the cavity shape, diesel fuel is commonly chosen as a solvent for cavity construction, and the related technology is mature. Diesel fuel-based cavity construction offers good safety and controllability of the oil-water interface, but it suffers from drawbacks such as high cost, difficulty in oil-water separation, and potential environmental pollution. Given the current situation where a salt chemical company in the location of a gas storage facility prohibits the use of diesel fuel for cavity construction, there is an urgent need to find alternative solvent-inhibiting technologies. Air-based solvent-inhibiting technology offers advantages such as safety and environmental friendliness, low cost, conventional technology, abundant resources, no brine or cavity wall pollution, and no need for explosion-proof systems. It is widely applicable to cavity construction for gas storage or liquefied product storage, gas storage facilities located in special areas (nature reserves, drinking water production areas), and storage of brine for chemical industries, regardless of the product type or environmental conditions, without any pollution.

[0004] The drawback of this method is that during the cavity creation process, the inner surface of the casing is affected by either air or brine, both of which can cause corrosion, albeit at different rates. ① In air, oxygen and carbon dioxide corrode steel, while air humidity is most closely related to the corrosion rate, with a critical humidity level of 60%. Dry air with lower humidity significantly reduces corrosion. ② When releasing the air cushion, the casing surface will be wetted by brine. The corrosion rate in the brine environment depends on the brine concentration; saturated brine reduces the corrosion rate. During cavity creation, the casing is primarily wetted by near-saturated brine. Therefore, a cavity creation device and method for reducing corrosion in salt cavern storage by using air-based corrosion inhibition is proposed to minimize tubing corrosion. Summary of the Invention

[0005] This invention provides a cavity-forming device and method for reducing corrosion in salt cavern storage by air inhibition, aiming to solve the problems in the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A cavity-forming device for reducing corrosion in salt cavern storage by air inhibition includes a production sleeve, an outer cavity-forming tube, an inner cavity-forming tube, an interface meter, a water injection mechanism, a gas injection mechanism, and a treatment mechanism. The production sleeve is vertically fixedly installed inside the cavity, with its upper end extending outside the cavity. The outer cavity-forming tube is vertically fixedly installed inside the outer cavity-forming tube, with its upper end extending outside the upper end of the production sleeve and forming an outer annular cavity with a closed upper end between them. The inner cavity-forming tube is vertically fixedly installed inside the outer cavity-forming tube, with its upper end extending outside the upper end of the outer cavity-forming tube and closed, forming a middle annular cavity with a closed upper end between it and the outer cavity-forming tube. The water injection mechanism is connected to the upper end of the inner cavity-forming tube via a pipeline. The gas injection mechanism is connected to the upper end of the outer annular cavity via a pipeline. The treatment mechanism is connected to the upper end of the middle annular cavity via a pipeline. The interface meter is used to measure the depth of the gas-liquid interface within the cavity.

[0008] The beneficial effects of this invention are: during the cavity-making process, fresh water is injected into the cavity through the water injection mechanism and dissolves with rock salt to form brine; at the same time, the air injection mechanism injects air into the outer annular cavity, and the brine is processed and discharged by the treatment mechanism.

[0009] During this process, the depth of the gas-liquid interface within the cavity is measured using an interface meter.

[0010] This invention can effectively reduce the degree of sleeve corrosion during air-resistant cavity creation, ensuring that the integrity and sealing of the tubing can meet the safety requirements for storing hydrocarbon gases or liquids.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the water injection mechanism includes a water injection pipeline, one end of which is connected to the upper end of the cavity tube, and a safety valve is fixedly installed on it.

[0013] The advantages of adopting the above-mentioned further solution are that it has a simple structure and reasonable design, and the water injection pipeline can be switched on and off through the safety valve, thereby realizing water injection.

[0014] Furthermore, the water injection mechanism also includes a water injection pump and a water tank, the bottom of the water tank being connected to the other end of the water injection pipeline, and the water injection pump being fixedly installed on the other end of the water injection pipeline.

[0015] The advantage of adopting the above-mentioned further solution is that during the water injection process, the fresh water stored in the water tank is delivered to the cavity by the water injection pump, making water injection convenient.

[0016] Furthermore, the air injection mechanism includes an air compressor, which is connected to the outer annular cavity via an air injection pipeline.

[0017] The beneficial effect of adopting the above-mentioned further solution is that during the cavity creation process, air is compressed by an air compressor and sent into the cavity to adjust the position of the gas-liquid interface in the cavity to a set depth.

[0018] Furthermore, the gas injection mechanism also includes a dehydrator, which is fixedly installed on the gas injection pipeline.

[0019] The beneficial effect of adopting the above-mentioned further solution is that during the cavity creation process, the air is compressed by an air compressor, dehydrated by a dehydrator, and then sent into the cavity to adjust the position of the gas-liquid interface in the cavity to a set depth. The structure is simple and the design is reasonable. The dehydrator can reduce the impact of moisture in the air on cavity creation.

[0020] Furthermore, the processing mechanism includes a gas-liquid separator, the inlet of which is connected to the annular cavity via a gas-liquid pipeline.

[0021] The beneficial effect of adopting the above-mentioned further solution is that during the cavity-making process, the discharged brine is treated by gas-liquid separation tank to protect the environment.

[0022] Furthermore, a second safety valve is fixedly installed on the gas-liquid pipeline.

[0023] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and the gas-liquid pipeline can be controlled by the second safety valve, making it easy to handle.

[0024] Furthermore, the processing facility also includes a salting plant, which is connected to the outlet of the gas-liquid separator via a pipeline.

[0025] The beneficial effect of adopting the above-mentioned further scheme is that during the cavity-making process, the discharged brine is separated into gas and liquid by a gas-liquid separator and then sent to a salt chemical plant for treatment, thus protecting the environment.

[0026] Furthermore, the processing mechanism also includes a gas-liquid separator, which is connected to the outer annular cavity via a pipeline.

[0027] The beneficial effect of adopting the above-mentioned further solution is that during the cavity creation process, the water-containing gas formed is separated by a gas-liquid separator and directly discharged into the atmosphere, thus protecting the environment.

[0028] This invention also relates to a cavity-forming method for reducing corrosion in salt cavern storage by air inhibition, which is implemented using the cavity-forming device for reducing corrosion in salt cavern storage as described above, and includes the following specific steps:

[0029] Fresh water is injected into the cavity through the water injection mechanism and dissolves with rock salt to form brine; at the same time, the air injection mechanism injects air into the outer annular cavity, and the brine is processed and discharged by the treatment mechanism; during this process, the depth of the gas-liquid interface in the cavity is measured by the interface instrument.

[0030] The beneficial effect of adopting the above-mentioned further solutions is that the present invention provides a cavity-making method, which can effectively reduce the degree of sleeve corrosion during air-resistant cavity-making, and ensure that the integrity and sealing of the tubing can meet the safety requirements for storing hydrocarbon gases or liquids. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Air compressor; 2. Dehydrator; 3. Safety valve one; 4. Interface meter; 5. Safety valve two; 6. Gas-liquid separator; 7. Salt chemical plant; 8. Gas-liquid separator; 9. Cavity; 10. Production sleeve; 11. Cavity outer tube; 12. Cavity inner tube. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a cavity-forming device for reducing corrosion in salt cavern storage by air-induced solvent inhibition. The device includes a production sleeve 10, an outer cavity-forming tube 11, an inner cavity-forming tube 12, an interface meter 4, a water injection mechanism, an air injection mechanism, and a treatment mechanism. The production sleeve 10 is vertically fixed inside the cavity 9, with its upper end extending outside the cavity 9. The outer cavity-forming tube 11 is vertically fixed inside the cavity-forming tube 11, with its upper end extending outside the upper end of the production sleeve 10, forming a closed outer ring with the production sleeve 10 at its upper end. The cavity is formed by the following: the inner tube 12 is vertically fixed inside the outer tube 11, with its upper end extending to the outside of the outer tube 11 and closed, forming a closed-at-the-top annular cavity with the outer tube 11; the water injection mechanism is connected to the upper end of the inner tube 12 through a pipeline, the air injection mechanism is connected to the upper end of the outer annular cavity through a pipeline, and the processing mechanism is connected to the upper end of the middle annular cavity through a pipeline; the interface meter 4 is used to measure the depth of the gas-liquid interface inside the cavity 9.

[0040] During the cavity-making process, fresh water is injected into cavity 9 through the water injection mechanism and dissolves with rock salt to form brine; at the same time, the air injection mechanism injects air into the outer annular cavity, and the brine is processed and discharged by the treatment mechanism.

[0041] During this process, the depth of the gas-liquid interface in the cavity is measured using the interface instrument 4.

[0042] Preferably, in this embodiment, the interface instrument 4 is preferably a fiber optic interface instrument, which is convenient for measurement.

[0043] This embodiment can effectively reduce the degree of sleeve corrosion during air-resistant cavity creation, ensuring that the integrity and sealing of the tubing can meet the safety requirements for storing hydrocarbon gases or liquids.

[0044] Example 2

[0045] Based on Embodiment 1, in this embodiment, the water injection mechanism includes a water injection pipeline, one end of which is connected to the upper end of the cavity tube 12, and a safety valve 3 is fixedly installed on it.

[0046] The scheme has a simple structure and reasonable design. The water injection pipeline can be opened and closed through safety valve 3, thereby realizing water injection.

[0047] Example 3

[0048] Based on Embodiment 2, in this embodiment, the water injection mechanism further includes a water injection pump and a water tank. The bottom of the water tank is connected to the other end of the water injection pipeline, and the water injection pump is fixedly installed on the other end of the water injection pipeline.

[0049] During the water filling process, the fresh water stored in the water tank is delivered to the cavity 9 by the water pump, making water filling convenient.

[0050] Example 4

[0051] Based on the above embodiments, in this embodiment, the air injection mechanism includes an air compressor 1, which is connected to the outer annular cavity through an air injection pipeline.

[0052] During the cavity creation process, air is compressed by air compressor 1 and sent into cavity 9 to adjust the position of the gas-liquid interface in cavity 9 to a set depth.

[0053] It should be noted that the air compressor 1 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0054] Example 5

[0055] Based on Embodiment 4, in this embodiment, the gas injection mechanism further includes a dehydrator 2, which is fixedly installed on the gas injection pipeline.

[0056] During the cavity creation process, air is compressed by air compressor 1, dehydrated by dehydrator 2, and then sent into cavity 9 to adjust the position of the gas-liquid interface in cavity 9 to a set depth. The structure is simple and the design is reasonable. The dehydrator 2 can reduce the impact of moisture in the air on cavity creation.

[0057] It should be noted that the above-mentioned dehydrator 2 uses existing technology, and its specific structure and principle will not be described in detail here.

[0058] Example 6

[0059] Based on the above embodiments, in this embodiment, the processing mechanism includes a gas-liquid separator 6, and the inlet of the gas-liquid separator 6 is connected to the middle annular cavity through a gas-liquid pipeline.

[0060] During the cavity-making process, the discharged brine is treated by gas-liquid separation tank 6 to protect the environment.

[0061] It should be noted that the gas-liquid separator 6 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0062] Example 7

[0063] Based on Example 6, in this example, a safety valve 25 is fixedly installed on the gas-liquid pipeline.

[0064] The solution has a simple structure and reasonable design. The gas-liquid pipeline can be controlled by safety valve 25, which makes it easy to handle.

[0065] Example 8

[0066] Based on any one of Embodiments 6 to 7, in this embodiment, the processing mechanism further includes a salting plant 7, which is connected to the outlet of the gas-liquid separator 6 via a pipeline.

[0067] During the cavity-making process, the discharged brine is separated into gas and liquid by the gas-liquid separator 6 and then sent to the salt chemical plant 7 for treatment to protect the environment.

[0068] The brine separated by the gas-liquid separator 6 is sent to the salt chemical plant 7. The brine treatment process in the salt chemical plant 7 is existing technology and will not be described in detail here.

[0069] Example 9

[0070] Based on any one of Embodiments 6 to 8, in this embodiment, the processing mechanism further includes a gas-liquid separator 8, which is connected to the outer annular cavity via a pipeline.

[0071] During the cavity creation process, the water-containing gas formed is separated by the gas-liquid separator 8 and then directly discharged into the atmosphere to protect the environment.

[0072] Preferably, in this embodiment, the gas-liquid separator 8 is preferably a vertical gas-liquid separation tank.

[0073] It should be noted that the above-mentioned vertical gas-liquid separator uses existing technology, and its specific structure and principle will not be described in detail here.

[0074] Example 10

[0075] Based on the above embodiments, this embodiment also provides a cavity-forming method for reducing corrosion by air infiltration in salt cavern storage, which is implemented using the cavity-forming device for reducing corrosion by air infiltration in salt cavern storage as described above, and includes the following specific steps:

[0076] Fresh water is injected into cavity 9 through water injection mechanism and dissolves with rock salt to form brine; at the same time, air injection mechanism injects air into outer annular cavity, brine is treated by treatment mechanism and discharged; during this process, the depth of gas-liquid interface in cavity 9 is measured by interface instrument 4.

[0077] This invention provides a cavity-building method that can effectively reduce the degree of sleeve corrosion during air-resistant cavity building, ensuring that the integrity and sealing of the tubing meet the safety requirements for storing hydrocarbon gases or liquids.

[0078] The working principle of this invention is as follows:

[0079] Fresh water enters the cavity inner tube through safety valve 3 and dissolves with rock salt to form brine. Air is compressed by air compressor 1 and then dehydrated and dried by dehydrator 2 before entering the annular portion of production sleeve 10 and cavity outer tube 11 to form an air cushion layer.

[0080] During the cavity-forming process, brine is discharged through the cavity-forming outer pipe and safety valve 5, and undergoes gas-liquid separation in the gas-liquid separator 6. After treatment, the brine is transported to the salt chemical plant 7 through a steel pipeline. Air is dehydrated in a vertical gas-liquid separator before being released into the atmosphere. An electrode system is connected to the bottom of the cavity-forming outer pipe, and the gas-liquid interface is controlled by means of a fiber optic interface instrument.

[0081] Based on the above design, the cavity achieves a favorable shape. During the cavity construction process, the average air consumption within the brine was observed to be 0.058 Nm. 3 / m 3 The consumption is similar to that of nitrogen gas for corrosion inhibition. Corrosion inspection of the well cavity was conducted, and casing wall thickness measurements using logging instruments confirmed that, within the limited cavity creation time, corrosion caused by using air as a solvent would not affect wall thickness or casing strength. This confirms the feasibility of the cavity creation device and method for reducing corrosion through air solvent inhibition in salt cavern gas storage.

[0082] This invention effectively reduces the degree of casing corrosion during air-insulated cavity construction, ensuring that the integrity and sealing of the tubing meet the safety requirements for storing hydrocarbon gases or liquids. It is also simple to operate, safe and environmentally friendly, and widely applicable, effectively reducing construction costs and improving economic efficiency. A comparison of the total cost of using several solvents for cavity construction in a 300,000 cubic meter cavity shows a ratio of approximately liquefied petroleum gas: nitrogen: air = 1:0.32:0.20. It is evident that after solving the air corrosion problem, the air-insulated cavity construction technology has the lowest operating cost due to the wide availability and ease of use of air, demonstrating significant economic advantages.

[0083] This invention provides a cavity-forming device and method for reducing corrosion in salt cavern storage by air-induced corrosion inhibition, which can reduce tubular corrosion caused by air-induced corrosion inhibition. The specific description is as follows:

[0084] (1) To control air humidity and minimize corrosion caused by using air as an inhibitor, a special air supply device is designed for air-inhibited cavity creation, consisting of an air compressor and a dehydrator (the dehydrator can be an ethanol dehydration skid). If a central compressor unit is used, the compressed air dried by the dehydration device is distributed to each cavity through a pipeline network installed at the cavity creation site. A gas-liquid separator is installed at the well site or cavity device site to degas the produced brine and prevent the brine discharge pipeline from being cracked by high-pressure gas and corroded by air.

[0085] (2) Special design for well completion equipment. Increase the casing wall thickness to prevent excessive corrosion from causing casing leakage. The final cemented casing model can be J-55 or K-55, and use airtight joints or welding to ensure good airtightness. Fiber optic interface meters, resistive interface meters, etc., can be installed on the cavity outer pipe to monitor the gas-liquid interface position. The cavity outer pipe is equipped with an airtight joint. Safety valves and cushion pressure control valves are installed at the inlet and outlet ends of the cavity wellhead.

[0086] (3) To reduce corrosion, the cavity-making method was specially adjusted. It is required to minimize the cavity-making stage when designing the cavity-making scheme, so as to reduce the number of times the cavity-making tubing is moved, thereby reducing the wetting and corrosion of the tubing surface by the brine; after the tank construction period, the top diameter of the cavity should be minimized during the cavity-making design to reduce the solubility of air in the brine; before adjusting the cavity-making tubing, ensure that the brine in the cavity is saturated to reduce the corrosion of the casing by the brine.

[0087] It should be noted that all electronic components involved in this invention adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A salt cavern repository air block solution corrosion reducing chambering apparatus characterized by: The system includes a production sleeve (10), an outer cavity tube (11), an inner cavity tube (12), an interface device (4), a water injection mechanism, an air injection mechanism, and a treatment mechanism. The production sleeve (10) is vertically fixed inside the cavity (9) and its upper end extends outside the cavity (9). The outer cavity tube (11) is vertically fixed inside the production sleeve (10) and its upper end extends outside the upper end of the production sleeve (10) to form an outer annular cavity with a closed upper end between it and the production sleeve (10). The inner cavity tube (12) 12) It is vertically fixed inside the cavity-forming outer tube (11), with its upper end extending to the upper end of the cavity-forming outer tube (11) and closed, and forming an upper closed middle annular cavity with the cavity-forming outer tube (11); the water injection mechanism is connected to the upper end of the cavity-forming inner tube (12) through a pipeline, the air injection mechanism is connected to the upper end of the outer annular cavity through a pipeline, and the treatment mechanism is connected to the upper end of the middle annular cavity through a pipeline; the interface instrument (4) is used to measure the depth of the gas-liquid interface in the cavity (9); The air injection mechanism includes an air compressor (1), which is connected to the outer annular cavity through an air injection pipeline; the air injection mechanism also includes a dehydrator (2), which is fixedly installed on the air injection pipeline; The cavity creation method, implemented using the cavity creation device, includes the following specific steps: Fresh water is injected into the cavity (9) through the water injection mechanism, where it dissolves with the rock salt to form brine; at the same time, air is injected. The mechanism injects air into the outer annular cavity, and the brine is processed and discharged by the treatment mechanism; during this process, the depth of the gas-liquid interface in the cavity (9) is measured by the interface instrument (4).

2. The cavern storage air retarding corrosion reducing chambering apparatus of claim 1 wherein: The water injection mechanism includes a water injection pipeline, one end of which is connected to the upper end of the cavity tube (12), and a safety valve (3) is fixedly installed on it.

3. The cavern storage air retarding corrosion reducing chambering apparatus of claim 2, wherein: The water injection mechanism also includes a water injection pump and a water tank. The bottom of the water tank is connected to the other end of the water injection pipeline, and the water injection pump is fixedly installed on the other end of the water injection pipeline.

4. The cavern storage air retarded corrosion reducing chambering apparatus of any of claims 1-3, wherein: The processing mechanism includes a gas-liquid separator (6), the inlet of which is connected to the annular cavity via a gas-liquid pipeline.

5. The cavern storage air retarding corrosion reducing chamber forming device of claim 4, wherein: Safety valve 2 (5) is fixedly installed on the gas-liquid pipeline.

6. The cavern storage air retarding corrosion reducing chamber forming device of claim 4, wherein: The processing facility also includes a salting plant (7), which is connected to the outlet of the gas-liquid separator (6) via a pipeline.

7. The cavern storage air retarding corrosion reducing chamber forming device of claim 4, wherein: The processing mechanism also includes a gas-liquid separator (8), which is connected to the outer annular cavity via a pipeline.

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