Cavity making device and method for reducing corrosion by air dissolution resistance of salt cavern

Abstract

The invention relates to a salt cavern reservoir air dissolution resistance and corrosion reduction cavity making device and method.The device comprises a production sleeve, a cavity making outer pipe, a cavity making inner pipe, an interface instrument, a water injection mechanism, an air injection mechanism and a processing mechanism, the production sleeve is vertically and fixedly installed in a cavity, the cavity making outer pipe is vertically and fixedly installed in the cavity making outer pipe, and the interface instrument is fixedly installed in the cavity; the upper end of the outer ring extends out of the upper end of the production sleeve and forms an outer ring cavity with a closed upper end with the production sleeve; the cavity-building inner pipe is vertically and fixedly mounted in the cavity-building outer pipe, the upper end of the cavity-building inner pipe extends out of the upper end of the cavity-building outer pipe and is closed, and a middle annular cavity with the closed upper end is formed between the cavity-building inner pipe and the cavity-building outer pipe; the water injection mechanism communicates with the upper end of the cavity making inner pipe through a pipeline, the gas injection mechanism communicates with the upper end of the outer annular cavity through a pipeline, and the processing mechanism communicates with the upper end of the middle annular cavity through a pipeline. According to the invention, the corrosion degree of the sleeve during air dissolution resistance cavity construction can be effectively reduced, so that the integrity and the sealing performance of the tubular column can meet the safety requirements of hydrocarbon gas or liquid storage.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum and natural gas engineering, and in particular to a cavity-making device and method for reducing corrosion by air dissolution in salt cavern storages. Background Art

[0002] At present, underground salt cavern storage mainly adopts water dissolution method to build caverns. During the cavern building process, it is necessary to inject dissolving agents such as diesel, nitrogen, and liquefied petroleum gas. The density difference between the dissolving agent and brine is used to form a dissolving agent layer of a certain thickness on the top of the salt cavern, thereby preventing water from dissolving upward, protecting the top of the salt cavern and promoting the lateral expansion of the salt cavern. During the cavern building process, the salt cavern is divided into different layers from bottom to top to control the shape of the cavity.

[0003] Most of the cavities in China are built in layered salt rocks. The geological conditions are relatively complex, the salt rocks have many interlayers and poor grades, and the cavity construction is difficult. In order to better control the shape of the cavity, diesel is generally selected as a dissolving agent for cavity construction, and the relevant technology is also mature. The safety of diesel dissolving cavity construction and the controllability of the oil-water interface are good, but there are disadvantages such as high cost, difficulty in oil-water separation, and easy environmental pollution. In view of the current situation that the salt chemical enterprise where a certain gas storage reservoir is located is prohibited from using diesel dissolving cavity construction, it is urgent to find other dissolving technologies. The air dissolving technology has the advantages of safety, environmental protection, low cost, conventional technology, rich resources, no pollution such as brine and cavity inner wall, and no explosion-proof system. It can be generally used for the construction of cavities for gas storage or storage of liquefied products, gas storage reservoirs located in special areas (nature reserves, drinking water production areas), brine used in the chemical industry, and other types of storage products or environmental conditions, without any pollution.

[0004] The disadvantage of this method is that during the cavity making process, the inner surface of the casing will be affected by air or brine. Corrosion will occur in both chemical environments, but the corrosion rate will be different. ① Among the air components, oxygen and carbon dioxide will corrode steel, and air humidity is most related to the corrosion level. The critical value of air humidity is 60%. Dry air with low humidity can significantly reduce corrosion. ② When the air cushion is discharged, the surface of the casing will be wetted by brine. The corrosion rate in the brine environment depends on the brine concentration. Saturated brine will reduce the corrosion rate. During the cavity making process, the casing is mainly wetted by nearly saturated brine. For this reason, a cavity making device and method for reducing corrosion by air dissolution in salt cavern storage are proposed to reduce pipe column corrosion. Summary of the invention

[0005] The invention provides a cavity-making device and method for air dissolution resistance and corrosion reduction in salt cavern storage, aiming to solve the problems in the prior art.

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

[0007] A cavity-making device for reducing corrosion by air dissolution in a salt cavern reservoir comprises a production casing, an outer cavity-making tube, an inner cavity-making tube, an interface meter, a water injection mechanism, a gas injection mechanism and a treatment mechanism. The production casing is vertically fixedly installed in the cavity and its upper end extends outside the cavity. The outer cavity-making tube is vertically fixedly installed in the outer cavity-making tube, its upper end extends to the outside of the upper end of the production casing and forms an outer annular cavity with a closed upper end between it and the production casing; the inner cavity-making tube is vertically fixedly installed in the outer cavity-making tube, its upper end extends to the outside of the upper end of the outer cavity-making tube and is closed, and forms a middle annular cavity with a closed upper end between it and the outer cavity-making tube; the water injection mechanism is connected to the upper end of the inner cavity-making tube through a pipeline, the gas 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 meter is used to measure the depth of the gas-liquid interface in the cavity.

[0008] The beneficial effects of the present invention are as follows: during the cavity making process, fresh water is injected into the cavity through the water injection mechanism and dissolved 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 processing mechanism;

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

[0010] The present invention can effectively reduce the degree of casing corrosion during air resistance dissolution cavity making, so that the integrity and sealing of the pipe column can meet the safety requirements for storing hydrocarbon gas or liquid.

[0011] Based on the above technical solution, the present invention can also be 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-building inner tube, and a safety valve is fixedly installed thereon.

[0013] The beneficial effects of adopting the above further solution are simple structure and reasonable design. The water injection pipeline can be opened and closed through the safety valve, thereby achieving water injection.

[0014] Furthermore, 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.

[0015] The beneficial effect of adopting the above further solution is that during the water filling process, the fresh water stored in the water tank is delivered to the cavity through the water filling pump, which makes water filling convenient.

[0016] Furthermore, the gas injection mechanism includes an air compressor, and the air compressor is connected to the outer annular cavity through a gas injection pipeline.

[0017] The beneficial effect of adopting the above further scheme is that during the cavity creation process, the air is compressed by the 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, and the dehydrator is fixedly installed on the gas injection pipeline.

[0019] The beneficial effect of adopting the above further scheme is that during the cavity creation process, the air is compressed by an air compressor, dehydrated by a dehydrator and 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. Dehydration by the dehydrator can reduce the impact of moisture in the air on cavity creation.

[0020] Furthermore, the processing mechanism includes a gas-liquid separation tank, and the inlet of the gas-liquid separation tank is connected to the middle annular cavity through a gas-liquid pipeline.

[0021] The beneficial effect of adopting the above further scheme is that during the cavity making process, the brine discharged is subjected to gas-liquid separation treatment in a gas-liquid separation tank to protect the environment.

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

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable design, the on-off of the gas-liquid pipeline can be controlled by the second safety valve, and the handling is convenient.

[0024] Furthermore, the processing mechanism also includes a salt chemical plant, and the salt chemical plant is connected to the outlet of the gas-liquid separation tank through a pipeline.

[0025] The beneficial effect of adopting the above further scheme is that during the cavity making process, the brine discharged is separated into gas and liquid in the gas-liquid separation tank, and then the brine is sent to the salt chemical plant for treatment to protect the environment.

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

[0027] The beneficial effect of adopting the above further scheme is that during the cavity making process, the water-containing gas formed is separated by the gas-liquid separator and then directly discharged into the atmosphere, thereby protecting the environment.

[0028] The present invention also relates to a method for making a cavity for reducing corrosion by air dissolution in a salt cavern reservoir, which is implemented by using the above-mentioned cavity making device for reducing corrosion by air dissolution in a salt cavern reservoir, and comprises 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 gas injection mechanism injects air into the outer annular cavity, and the brine is processed and discharged by the processing mechanism; in this process, the depth of the gas-liquid interface in the cavity is measured by the interface meter.

[0030] The beneficial effect of adopting the above further scheme is that the present invention provides a cavity making method, which can effectively reduce the degree of casing corrosion during air resistance dissolution cavity making, so that the integrity and sealing of the pipe column can meet the safety requirements for storing hydrocarbon gases or liquids. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Air compressor; 2. Dehydrator; 3. Safety valve one; 4. Interface instrument; 5. Safety valve two; 6. Gas-liquid separation tank; 7. Salt chemical plant; 8. Gas-liquid separator; 9. Cavity; 10. Production casing; 11. External tube for cavity making; 12. Internal tube for cavity making. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

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

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a cavity making device for reducing corrosion by air dissolution in a salt cavern reservoir, comprising a production casing 10, a cavity making outer tube 11, a cavity making inner tube 12, an interface instrument 4, a water injection mechanism, a gas injection mechanism and a treatment mechanism. The production casing 10 is vertically fixedly installed in a cavity 9 and its upper end extends outside the cavity 9. The cavity making outer tube 11 is vertically fixedly installed in the cavity making outer tube 11, and its upper end extends outside the upper end of the production casing 10 and forms an outer ring with a closed upper end with the production casing 10. shaped cavity; the inner cavity tube 12 is vertically fixedly installed in the outer cavity tube 11, and its upper end extends to the outside of the upper end of the outer cavity tube 11 and is closed, and a middle annular cavity with a closed upper end is formed between the inner cavity tube 11 and the outer cavity tube 11; the water injection mechanism is connected to the upper end of the inner cavity tube 12 through a pipeline, the gas 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 in the cavity 9.

[0040] During the cavity making process, fresh water is injected into the cavity 9 through the water injection mechanism and dissolves with the 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 processing mechanism;

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

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

[0043] This embodiment can effectively reduce the degree of casing corrosion during air resistance dissolution cavity making, so that the integrity and sealing of the pipe string can meet the safety requirements for storing hydrocarbon gas or liquid.

[0044] Example 2

[0045] On the basis of Example 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-making inner tube 12, and a safety valve 3 is fixedly installed thereon.

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

[0047] Example 3

[0048] On the basis of Example 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 injection process, the fresh water stored in the water tank is delivered to the cavity 9 by the water injection pump, so that the water injection is convenient.

[0050] Example 4

[0051] On the basis of the above embodiments, in this embodiment, the gas injection mechanism includes an air compressor 1, and the air compressor 1 is connected to the outer annular cavity through a gas injection pipeline.

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

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

[0054] Example 5

[0055] On the basis of Example 4, in this embodiment, the gas injection mechanism further includes a dehydrator 2, and the dehydrator 2 is fixedly installed on the gas injection pipeline.

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

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

[0058] Example 6

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

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

[0061] It should be noted that the gas-liquid separation tank 6 adopts the existing technology, and its specific structure and principle are not described in detail here.

[0062] Example 7

[0063] On the basis of Example 6, in this embodiment, a safety valve 5 is fixedly installed on the gas-liquid pipeline.

[0064] This solution has a simple structure and a reasonable design. The on-off of the gas-liquid pipeline can be controlled by the safety valve 5, and the handling is convenient.

[0065] Example 8

[0066] On the basis of any one of Embodiments 6 to 7, in this embodiment, the processing mechanism further includes a salting plant 7, and the salting plant 7 is connected to the outlet of the gas-liquid separation tank 6 through a pipeline.

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

[0068] The brine separated by the gas-liquid separation tank 6 is sent to the salt chemical plant 7. The treatment process of the brine in the salt chemical plant 7 is a prior art and will not be described in detail here.

[0069] Example 9

[0070] On the basis of any one of Examples 6 to 8, in this embodiment, the processing mechanism further includes a gas-liquid separator 8, and the gas-liquid separator 8 is connected to the outer annular cavity through a pipeline.

[0071] During the cavity making 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 separation tank adopts the existing technology, and its specific structure and principle will not be described in detail here.

[0074] Example 10

[0075] On the basis of the above embodiments, this embodiment further provides a method for making a cavity in a salt cavern reservoir by air dissolution resistance and corrosion reduction, which is implemented by using the above-mentioned cavity making device for air dissolution resistance and corrosion reduction in a salt cavern reservoir, and includes the following specific steps:

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

[0077] This paper provides a cavity making method, which can effectively reduce the degree of casing corrosion during air resistance dissolution cavity making, so that the integrity and sealing of the pipe string can meet the safety requirements for storing hydrocarbon gas or liquid.

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

[0079] Fresh water enters the inner tube of the cavity through a safety valve 3 and dissolves with rock salt to form brine. The air is compressed by the air compressor 1 and then dehydrated and dried by the dehydrator 2, and enters the annular space between the production casing 10 and the outer tube of the cavity 11 to form an air cushion.

[0080] During the cavity making process, brine is discharged from the cavity making outer tube and safety valve 5, and is separated into gas and liquid through the gas-liquid separation tank 6. After treatment, the brine is transported to the salt chemical plant 7 through a steel pipe pipeline. The air is dehydrated through a vertical gas-liquid separation tank and then discharged into the atmosphere. An electrode system is connected to the bottom of the cavity making outer tube, and the gas-liquid interface is controlled by means such as an optical fiber interface instrument.

[0081] Based on the above design, the cavity has formed a good shape. During the cavity making process, the average air consumption in the brine was observed to be 0.058Nm 3 / m 3 , which is similar to the consumption of nitrogen dissolution resistance. The corrosion condition of the cavity well was checked, and the casing wall thickness was measured by logging instruments, proving that within the limited cavity making time of the construction cavity, the corrosion caused by using air as a dissolution resistance would not affect the wall thickness and casing strength. The feasibility of the cavity making device and method for reducing corrosion by air dissolution resistance in salt cavern gas storage was confirmed.

[0082] The present invention can effectively reduce the degree of casing corrosion during air-resistance dissolution cavity making, so that the integrity and sealing of the pipe column can meet the safety requirements for storing hydrocarbon gases or liquids. It is easy to operate, safe and environmentally friendly, and has a wide range of applications. It can effectively reduce the cost of library construction and improve the economy of library construction. A cavity with a volume of 300,000 cubic meters is formed, and the total cost relationship of using several dissolving agents for cavity making is compared. The ratio is approximately liquefied petroleum gas: nitrogen: air = 1:0.32:0.20. It can be seen that after solving the problem of air corrosion, due to the characteristics of wide air sources and easy availability, the air-resistance dissolution cavity making technology has the lowest operating cost and has significant economic advantages.

[0083] The present invention provides a cavity-making device and method for reducing corrosion by air dissolution in salt cavern storage, which can reduce the corrosion of pipe columns caused by air dissolution. The specific description is as follows:

[0084] (1) In order to control the air humidity and minimize the degree of corrosion caused by using air as a dissolution agent, the air supply device required for air dissolution cavity making is specially designed, 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 by setting up a pipeline network at the cavity making site. A gas-liquid separation tank is set up at the well site or the dissolution cavity device site to degas the produced brine to prevent the brine discharge pipeline from being fractured by high-pressure gas and corroded by air.

[0085] (2) Special design is made for completion equipment. The casing wall thickness is increased to prevent casing leakage caused by excessive corrosion. The final cement-bonded casing model can be J-55 or K-55, and airtight joints or welding are used to ensure good airtightness. Fiber optic interface meters, resistive interface meters, etc. can be installed on the outer tube of the cavity to monitor the position of the gas-liquid interface. The outer tube of the cavity is equipped with airtight joints. Safety valves and cushion pressure control valves are installed at the inlet and outlet of the cavity wellhead.

[0086] (3) To reduce the occurrence of corrosion, the cavity making method is specially adjusted. It is required to minimize the cavity making stage when designing the cavity making plan to reduce the number of times the cavity making pipe string is moved, thereby reducing the wetting and corrosion of the pipe string surface by brine; after the trenching period is over, the top diameter of the cavity should be minimized when designing the cavity to reduce the solubility of air in brine; before adjusting the cavity making pipe string, ensure that the brine in the cavity is in a saturated state to reduce the corrosion of the brine on the casing.

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

[0088] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0089] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cavity-making device for salt cavern storage with air resistance and corrosion reduction, characterized in that: The invention comprises a production casing (10), an outer cavity tube (11), an inner cavity tube (12), an interface instrument (4), a water injection mechanism, a gas injection mechanism and a processing mechanism. The production casing (10) is vertically fixedly installed in a cavity (9) and its upper end extends to the outside of the cavity (9). The outer cavity tube (11) is vertically fixedly installed in the outer cavity tube (11), its upper end extends to the outside of the upper end of the production casing (10) and forms an outer annular cavity with a closed upper end between the production casing (10); the inner cavity tube ( 12) is vertically fixedly installed in the outer cavity tube (11), and its upper end extends to the outside of the upper end of the outer cavity tube (11) and is closed, and forms a middle annular cavity with a closed upper end between the outer cavity tube (11); the water injection mechanism is connected to the upper end of the inner cavity tube (12) through a pipeline, the gas 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 meter (4) is used to measure the depth of the gas-liquid interface in the cavity (9).

2. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to claim 1 is characterized in that: The water injection mechanism comprises a water injection pipeline, one end of which is connected to the upper end of the cavity-making inner tube (12), and a safety valve (3) is fixedly installed thereon.

3. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to claim 2 is characterized in that: 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. The water injection pump is fixedly installed on the other end of the water injection pipeline.

4. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to any one of claims 1 to 3, characterized in that: The gas injection mechanism comprises an air compressor (1), and the air compressor (1) is connected to the outer annular cavity through a gas injection pipeline.

5. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to claim 4 is characterized in that: The gas injection mechanism further comprises a dehydrator (2), and the dehydrator (2) is fixedly mounted on the gas injection pipeline.

6. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to any one of claims 1 to 3, characterized in that: The processing mechanism comprises a gas-liquid separation tank (6), the inlet of which is connected to the middle annular cavity via a gas-liquid pipeline.

7. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to claim 6 is characterized in that: A second safety valve (5) is fixedly installed on the gas-liquid pipeline.

8. The air-resistant and corrosion-reducing cavity-making device for salt cavern storage according to claim 6 is characterized in that: The processing mechanism further comprises a salt chemical plant (7), and the salt chemical plant (7) is connected to the outlet of the gas-liquid separation tank (6) through a pipeline.

9. The air-resistance and corrosion-reducing cavity-making device for salt cavern storage according to claim 6 is characterized by: The processing mechanism further comprises a gas-liquid separator (8), and the gas-liquid separator (8) is connected to the outer annular cavity through a pipeline.

10. A method for creating a cavern by air dissolution resistance to reduce corrosion in a salt cavern storage, characterized in that: The method is implemented by using the air-resistance and corrosion-reducing cavity-making device for salt cavern storage as claimed in any one of claims 1 to 9, including the following specific steps: Fresh water is injected into the 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 processing mechanism; during this process, the depth of the gas-liquid interface in the cavity (9) is measured by the interface meter (4).

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