Salt-cavern gas storage gas sealing detection method, device, equipment, medium and product

Abstract

The invention discloses a salt-cavern gas storage gas sealing detection method, device, equipment, medium and product, and relates to the technical field of salt-cavern gas storage engineering. The method comprises the steps that nitrogen is injected into a target injection-production well of a salt-cavern gas storage through an injection-production mother pipe, brine is discharged from well mouths of other injection-production wells of the salt-cavern gas storage, and the salt-cavern gas storage gas sealing detection device is obtained; stopping discharging the brine until the gas-liquid interface of the target injection and production well reaches a set distance below the tail end of the production casing; the gas pressure and the gas temperature of the wellhead of the target injection and production well and the liquid pressure of the wellheads of other injection and production wells are obtained; and when the gas temperature is kept constant, determining the gas tightness of the target injection-production well of the salt-cavern gas storage based on the gas pressure and the liquid pressure within the set time period. According to the method, the gas sealing condition of the salt-cavern gas storage can be determined under the condition that a testing tubular column and a physical gas-liquid interface measuring instrument are not tripped, so that the working efficiency is improved, and the work amount is reduced.

Description

Technical Field

[0001] This application relates to the field of salt cavern gas storage engineering technology, and in particular to a method, apparatus, equipment, medium and product for detecting the gas tightness of salt cavern gas storage. Background Technology

[0002] Salt cavern gas storage is a type of gas storage space frequently used in compressed air energy storage and natural gas storage. It requires a high degree of gas tightness in the salt cavern cavity and its injection / production wellbore. In engineering practice, traditional gas tightness testing methods are typically used to verify the sealing performance of the injection / production wellbore, packer, and open-hole section of the salt cavern cavity. Traditional gas tightness testing methods have two characteristics: first, a test string needs to be installed in the injection / production manifold, and nitrogen gas needs to be injected into the annulus of both the manifold and the test string; second, a physical gas-liquid interface measuring instrument needs to be installed in the test string to measure changes in the gas-liquid interface.

[0003] The basic principle of gas seal testing is: if there is a gas leak, the total molecular weight of the gas decreases, the gas pressure drops, and the gas-liquid interface... It will definitely rise, that is The gas-liquid interface rises by no more than 1 meter within a 24-hour observation period and exhibits a clear curve convergence, which is considered a successful gas seal. The physical principle behind this is the principle of communicating vessels.

[0004] According to the principle of communicating vessels, the gas-liquid interface Changes in the gas seal are a core indicator of whether a gas leak has occurred. Traditional gas seal testing involves two essential workflows: first, lowering a test string of 500-3000 meters depending on the depth of the salt cavern cavity, typically requiring large engineering machinery such as drilling rigs and workover rigs; second, inserting a physical gas-liquid interface measuring instrument into the test string, which is cumbersome, carries risks of instrument falling downhole, and measurement failure. To improve the workflow and efficiency of traditional testing methods, a new gas seal testing method for salt cavern gas storage is urgently needed. This method should measure the gas-liquid interface using a computational approach without lowering test strings or physical gas-liquid interface measuring instruments, thereby determining the gas seal status of the salt cavern gas storage, improving efficiency, and reducing the workload. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, equipment, medium, and product for testing the gas tightness of a salt cavern gas storage facility, which can determine the gas tightness of the salt cavern gas storage facility without lowering a test column or a physical gas-liquid interface measuring instrument, thereby improving work efficiency and reducing the amount of engineering work.

[0006] To achieve the above objectives, this application provides the following solution: Firstly, this application provides a method for detecting the gas tightness of a salt cavern gas storage facility, including: Nitrogen gas is injected into the target injection-production well of the salt cavern gas storage through the injection-production manifold, and brine is discharged from the wellheads of other injection-production wells in the salt cavern gas storage until the gas-liquid interface of the target injection-production well reaches a set distance below the end of the production casing, at which point the discharge of brine stops; other injection-production wells refer to injection-production wells in the salt cavern gas storage other than the target injection-production well. Obtain the gas pressure and gas temperature at the wellhead of the target injection and production well, as well as the liquid pressure at the wellheads of other injection and production wells; When the gas temperature remains constant, the gas sealing performance of the target injection-production well in the salt cavern gas storage is determined based on the gas pressure and the liquid pressure within a set time period.

[0007] In one embodiment, the maximum pressure of nitrogen injected into the target injection-production well of the salt cavern gas storage through the injection-production header is set as the maximum operating pressure of the salt cavern gas storage.

[0008] In one embodiment, the gas pressure and the liquid pressure satisfy the formula: ; In the formula, This indicates the density of the gas. This indicates the density of the liquid. Indicates gas pressure. Indicates liquid pressure, Represents gravitational acceleration. This indicates the depth of the gas-liquid interface.

[0009] In one embodiment, determining the gas tightness of a target injection-production well in a salt cavern gas storage facility based on the gas pressure and the liquid pressure within a set time period includes: Based on the gas pressure and the liquid pressure, determine the consistency change correlation index of the gas-liquid interface change in the target injection and production well; Determine whether the consistency change correlation index within the set time period meets the set conditions; If the consistency change correlation index within the set time period meets the set conditions, then the gas sealing performance of the target injection-production well of the salt cavern gas storage reaches the set standard. If the consistency change correlation index within the set time period does not meet the set conditions, then the gas sealing performance of the target injection-production well of the salt cavern gas storage has not reached the set standard.

[0010] In one embodiment, the consistency change correlation index is represented as: ; Indicates gas pressure. This indicates the pressure of the liquid.

[0011] Secondly, this application provides a gas tightness testing device for a salt cavern gas storage facility, used to implement the gas tightness testing method for a salt cavern gas storage facility as described in any one of the above-mentioned methods; the gas tightness testing device for a salt cavern gas storage facility includes: a surface casing, a production casing, an injection and production main pipe, a packer, a drain pipe, a gas transmission pipe, a data acquisition unit, and a processing unit; The surface casing is installed on the outermost layer of the target injection-production wellbore in the salt cavern gas storage facility; the production casing is installed inside the surface casing; the injection-production main pipe is installed inside the production casing; the packer is connected to the lower end of the injection-production main pipe and is installed between the injection-production main pipe and the production casing. The outer casing provides wellhead support and suspension points for the installation of the production casing; the production casing provides wellhead support and suspension points for the injection-production main pipe; the injection-production main pipe is used to inject nitrogen into the target injection-production well; the packer isolates the space between the injection-production main pipe and the production casing from nitrogen; the space formed by the production casing, the injection-production main pipe, and the packer is filled with annular protective fluid. The drainage pipeline is connected to the wellheads of other injection and production wells in the salt cavern gas storage facility; the drainage pipeline is used to discharge brine; the gas transmission pipeline is connected to the injection and production main pipeline; the gas transmission pipeline is used to transport nitrogen. The data acquisition unit is connected to the injection-production main pipe and other injection-production wells respectively; the data acquisition unit is used to obtain the gas pressure and gas temperature at the wellhead of the target injection-production well and the liquid pressure at the wellhead of other injection-production wells; The processing unit is connected to the data acquisition unit; the processing unit is used to determine the gas sealing performance of the target injection-production well of the salt cavern gas storage based on the gas pressure and the liquid pressure within a set time period when the gas temperature remains constant.

[0012] In one embodiment, the data acquisition unit includes a gas pressure sensor, a liquid pressure sensor, and a temperature sensor; The gas pressure sensor is installed on the gas transmission pipeline to collect the gas pressure at the wellhead of the target injection-production well; the temperature sensor is installed at the wellhead of the target injection-production well to collect the gas temperature at the wellhead; and the liquid pressure sensor is installed on the drainage pipeline to collect the liquid pressure at the wellheads of other injection-production wells.

[0013] Thirdly, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the salt cavern gas storage gas tightness detection method described in any one of the above.

[0014] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the salt cavern gas storage gas tightness detection method described above.

[0015] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the salt cavern gas storage gas tightness detection method described above.

[0016] According to the specific embodiments provided in this application, this application has the following technical effects: This application provides a method, apparatus, equipment, medium, and product for gas tightness testing of salt cavern gas storage. Nitrogen gas is directly injected into the target injection-production well through the injection-production manifold. After stopping brine discharge, the gas pressure and temperature at the wellhead of the target injection-production well, as well as the liquid pressure at the wellheads of other injection-production wells, are obtained. With the gas temperature remaining constant, the gas tightness of the target injection-production well in the salt cavern gas storage is determined based on the gas and liquid pressures within a set time period. This eliminates the need to run test tubing into the injection-production manifold and avoids the use of physical gas-liquid interface measuring instruments. The gas tightness of the target injection-production well is determined solely by the gas pressure and temperature at the wellhead and the liquid pressure at the wellheads of other injection-production wells. This avoids the risk of instruments falling downhole and measurement failure, reduces the workload of the testing, and improves the efficiency of gas tightness testing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram illustrating the gas tightness test of a salt cavern gas storage facility according to an embodiment of this application; Figure 2 A schematic diagram illustrating the injection of nitrogen into a target injection-production well, provided as an embodiment of this application; Figure 3 This is a schematic diagram showing the gas-liquid interface reaching the gas-tightness detection position according to an embodiment of this application. Figure 4 This is a schematic diagram of the principle of communicating vessels; Figure 5 A schematic diagram of the gas-pressure differential curve in a convergent state; Figure 6 A schematic diagram of the gas-pressure differential curve in a non-convergent state; Figure 7This is a schematic diagram of a traditional airtightness testing method.

[0019] Figure 8 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application.

[0020] Figure descriptions: 1-Injection / production manifold, 2-Production casing, 3-Annular protective fluid, 4-Surface casing, 5-Packer, 6-Gas pressure sensor, 7-Liquid pressure sensor, 8-Gate valve, 9-Other injection / production wells, 10-Gas transmission pipeline, 11-Drainage pipeline, 12-Test string, 13-Gas-liquid interface measuring instrument. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] See Figure 1 In one exemplary embodiment, a method for detecting the gas tightness of a salt cavern gas storage facility is provided, comprising the following steps: (1) Nitrogen gas is injected into the target injection-production well of the salt cavern gas storage through the injection-production mother pipe 1, and brine is discharged from the wellhead of other injection-production wells 9 of the salt cavern gas storage until the gas-liquid interface of the target injection-production well reaches a set distance below the end of the production casing 2, and then the discharge of brine is stopped.

[0024] In this embodiment, the set distance can be 5m, that is, when the gas-liquid interface drops to 5m below the naked eye section, it is determined to reach the gas seal detection position.

[0025] Specifically, without running a test tubing string, high-pressure nitrogen gas is injected directly into the target injection-production well from the injection-production main pipe 1 using a liquid nitrogen truck and a pressurized pump truck, such as... Figure 2As shown. When nitrogen is injected into the target injection-production well through the injection-production manifold 1, the maximum nitrogen pressure is set to the maximum operating pressure of the salt cavern gas storage tank. As the injected nitrogen pressure gradually increases, the saturated brine liquid pressure at the wellheads of other injection-production wells 9 begins to increase. To ensure that the overall pressure in the salt cavern gas storage tank does not exceed its maximum operating pressure and to achieve a gradual decrease in the gas-liquid interface of the target injection-production well, some brine must be discharged from other injection-production wells 9 to gradually lower the gas-liquid interface until it reaches 5 meters below the open hole section. At this point, the discharge of brine and nitrogen injection are stopped, and the gas-liquid interface reaches the gas seal detection position. (See diagram.) Figure 3 As shown.

[0026] (2) Obtain the gas pressure and gas temperature at the wellhead of the target injection-production well, as well as the liquid pressure at the wellhead of other injection-production wells. When the gas temperature remains constant, determine the gas tightness of the target injection-production well in the salt cavern gas storage based on the gas pressure and liquid pressure within a set time period.

[0027] Specifically, when performing step (1) above, the pressure of nitrogen injected into the target injection-production well will gradually increase, and the temperature of the gas will gradually rise during the compression process. When injecting nitrogen to increase the gas pressure, the nitrogen injection flow rate and pressurization rate are controlled to ensure that the gas temperature returns to the formation temperature within a certain period of time (8 hours in this embodiment) and remains constant (i.e., the condition of maintaining a constant gas temperature is met).

[0028] Among these, determining the gas tightness of the target injection and production wells in the salt cavern gas storage based on gas and liquid pressures within a set time period includes: 1) Determine the consistency change correlation index of the gas-liquid interface changes in the target injection-production well based on gas pressure and liquid pressure. 2) Determine whether the consistency change correlation index meets the set conditions within a set time period. 3) If the consistency change correlation index meets the set conditions within the set time period, the gas sealing performance of the target injection-production well in the salt cavern gas storage facility meets the set standard. If the consistency change correlation index does not meet the set conditions within the set time period, the gas sealing performance of the target injection-production well in the salt cavern gas storage facility does not meet the set standard.

[0029] In this embodiment, the acquired observation values ​​include the gas pressure at the wellhead of the target injection-production well. Liquid pressure at the head of other injection and production wells (9 wells) and the gas temperature at the wellhead of the target injection-production well. According to the principle of communicating vessels (as shown in the diagram of the principle of communicating vessels), Figure 4 (As shown), gas pressure Liquid pressure and gas temperature They satisfy formulas (1) and (2) respectively.

[0030] (1) (2) In the formula, This indicates the density of the gas. This indicates the density of the liquid. Indicates gas pressure. Indicates liquid pressure, This represents the acceleration due to gravity (which is a constant). This indicates the depth of the gas-liquid interface. This refers to the air column pressure. This represents the pressure of the liquid column. This represents the molar mass of the gas (which is a constant). Represents the amount of substance (a constant). Indicates the temperature of the gas.

[0031] For ease of analysis, formula (1) is transformed into formula (3): (3) because The gravitational acceleration constant (numerically constant) is used to maintain the constant. The depth of the gas-liquid interface is... The difference between gas pressure and liquid pressure The correlation between them was analyzed.

[0032] First, it is assumed that the gas temperature remains constant at this point. All strata exhibit geothermal gradients, which refer to the rate of increase in stratum temperature with depth, unaffected by atmospheric temperature. Geothermal gradients are parameters indicating the degree of uneven temperature distribution within the Earth; generally, the deeper the burial, the higher the temperature value. The injection-production manifold 1 and the salt cavern are tightly enclosed by the strata, and it is generally assumed that the temperature of the injected nitrogen returns to the stratum temperature after 8 hours and remains constant.

[0033] At this point, there are two possibilities: 1. The first possibility is that the target injection-production well in the salt cavern gas storage facility has excellent gas sealing, meaning there is no gas leakage. When there is no gas leakage, the total molecular weight of the gas in the target injection-production well remains unchanged, and the gas pressure... and liquid pressure If it remains unchanged, then the gas-liquid pressure difference (i.e., the difference between gas pressure and liquid pressure) is the pressure difference between the gas and liquid. Unchanged, meaning the molecules in formula (3) remain unchanged; liquid density If the total molecular weight of the gas remains constant, then the gas density... If it remains unchanged, then The denominator of formula (3) remains unchanged. Therefore, to ensure the gravitational acceleration... The depth of the gas-liquid interface remains unchanged. It should remain unchanged. Therefore, the conclusion is: when the gas temperature is constant, if the gas pressure difference... The unchanged value can be considered as the depth of the gas-liquid interface. The gas level remained unchanged, and there was no gas leakage.

[0034] 2. The second possibility is poor gas sealing, meaning there is a gas leak. When there is a gas leak, the total number of gas molecules decreases, and the gas pressure... Decrease, liquid pressure If it remains unchanged, then the gas-liquid pressure difference (i.e., the difference between gas pressure and liquid pressure) is the pressure difference between the gas and liquid. The molecule becomes smaller, meaning the molecule in formula (3) becomes smaller; liquid density If the total molecular weight of the gas remains constant, then the gas density decreases. Get smaller, then Increase, depth of gas-liquid interface It gets smaller. Therefore, in order to ensure gravitational acceleration... Remain unchanged, in When the size increases, the depth of the gas-liquid interface The smaller the pressure difference, the better the hydraulic pressure. The rate of decrease is greater. Therefore, the conclusion is: when the gas temperature is constant, if the gas-pressure difference... The decrease can be considered as the depth of the gas-liquid interface. The rate at which it shrinks is greater, indicating a gas leak.

[0035] Based on the two possible analyses above, the following conclusions can be drawn: When the gas temperature remains constant, the gas pressure difference... Depth of gas-liquid interface There is a highly consistent trend of change. After the observation period (i.e., the set time period), the gas-pressure difference... When it tends to converge and remain constant, it can be considered as the depth of the gas-liquid interface. The gas tightness remains unchanged, meeting the set standard. After the observation period, the hydraulic differential... When the decline continues without convergence, it can be considered that the gas-liquid interface is rising faster (i.e., the gas-liquid interface depth is increasing). (It shrinks faster), and the gas tightness does not meet the set standard. Therefore, without using a physical gas-liquid interface measuring instrument, the gas-liquid pressure difference can be measured. This is considered a consistent indicator of changes in the gas-liquid interface. By determining the changes in the gas-liquid interface, the gas sealing condition (i.e., gas tightness) of the salt cavern can be determined.

[0036] In one embodiment, the correlation index is based on the consistency change. A correlation analysis was conducted on the observation data (including gas pressure and liquid pressure) within a set time period (72 hours in this embodiment) after the gas temperature was kept constant.

[0037] Let the first The hourly air pressure difference is: .when When the plotted curve is in a convergent state, the gas tightness is considered to have met the set standard, such as... Figure 5 As shown. When When the plotted curve is in a non-convergent state, it is considered that the gas tightness has not met the set standard, such as... Figure 6 As shown. Among them, Figure 5 and Figure 6 a, b, c, d, and e are all constants.

[0038] In conjunction with the above embodiments, the beneficial effects of this application compared with related technologies are as follows: related technologies generally adopt traditional gas tightness testing methods (such as...) Figure 7 As shown, a test string 12 is run into the injection-production manifold 1, and a physical gas-liquid interface measuring instrument 13 is run into the test string 12. Nitrogen gas is injected into the annulus of the injection-production manifold 1 and the test string 12 into the open hole section. The gas seal condition is determined by measuring the change in the gas-liquid interface in the annulus. Traditional gas seal testing methods require the use of large engineering machinery, such as drilling rigs and workover rigs, and require running the physical gas-liquid interface measuring instrument 13 into the test string 12, which is cumbersome, carries the risk of the instrument falling downhole, and the measurement failing. The gas seal testing method for salt cavern gas storage proposed in this application can determine the gas seal condition of salt cavern gas storage without running a test string or a physical gas-liquid interface measuring instrument 13, thereby improving the efficiency of gas seal testing and reducing the amount of engineering work.

[0039] Based on the same inventive concept, this application also provides a salt cavern gas storage gas tightness detection device for implementing the above-mentioned salt cavern gas storage gas tightness detection method. For example... Figure 1 As shown, the gas tightness detection device for salt cavern gas storage includes: surface casing 4, production casing 2, injection and production main pipe 1, packer 5, drain pipe 11, gas transmission pipe 10, data acquisition unit and processing unit (not shown in the figure).

[0040] The surface casing 4 is installed on the outermost layer of the target injection-production wellbore in the salt cavern gas storage facility. The production casing 2 is installed inside the surface casing 4. The injection-production header 1 is installed inside the production casing 2. The packer 5 is connected to the lower end of the injection-production header 1 and is installed between the injection-production header 1 and the production casing 2.

[0041] The surface casing 4 provides wellhead support and a suspension point for the installation of the production casing 2. The production casing 2 provides wellhead support and a suspension point for the injection-production manifold 1. The injection-production manifold 1 is used to inject nitrogen into the target injection-production well. The packer 5 is used to isolate the space between the injection-production manifold 1 and the production casing 2 from the nitrogen. The space formed by the production casing 2, the injection-production manifold 1, and the packer 5 is filled with annular protective fluid 3.

[0042] The drainage pipe 11 is connected to the wellheads of other injection and production wells 9 in the salt cavern gas storage facility. The drainage pipe 11 is used to drain brine. The gas transmission pipe 10 is connected to the injection and production main pipe 1. The gas transmission pipe 10 is used to transport nitrogen. In this embodiment, gate valves 8 are installed on both the drainage pipe 11 and the gas transmission pipe 10.

[0043] The data acquisition unit is connected to the injection-production header 1 and other injection-production wells 9. The data acquisition unit is used to acquire the gas pressure and temperature at the wellhead of the target injection-production well and the liquid pressure at the wellhead of the other injection-production wells 9. In this embodiment, the data acquisition unit includes a gas pressure sensor 6, a liquid pressure sensor 7, and a temperature sensor. The gas pressure sensor 6 is installed on the gas transmission pipeline 10 to acquire the gas pressure at the wellhead of the target injection-production well; the temperature sensor (… Figure 1 (Not shown) is installed at the wellhead of the target injection-production well to collect the gas temperature at the wellhead of the target injection-production well; the liquid pressure sensor 7 is installed on the drain pipe 11 to collect the liquid pressure at the wellhead of other injection-production wells 9.

[0044] The processing unit is connected to the data acquisition unit. The processing unit is used to determine the gas tightness of the target injection-production well in the salt cavern gas storage facility based on the gas pressure and liquid pressure within a set time period, while maintaining a constant gas temperature.

[0045] The surface casing 4 is located at the outermost layer of the wellbore, extending downwards from the surface, typically into the first stable and dense bedrock layer. Its main functions are: to isolate the loose surface layer and aquifer, preventing shallow gas or fluid from entering the well; and to provide stable wellhead support and suspension points for the installation of the production casing 2.

[0046] Production casing 2 is located within surface casing 4, typically traversing complex formations (such as high-pressure zones, easily collapsible zones, and the top of salt rock layers) until it approaches but does not enter the top of the salt cavern cavity. Its main functions are: to isolate all formations above the open hole section of the wellbore to prevent gas leakage; to provide strength against lateral compression from the salt rock, protecting the wellbore from collapse; to provide stable wellhead support and suspension points for the injection and production tubing; and the annulus between it and the injection / production main tubing 1 is one of the key spaces for subsequent injection of protective fluid.

[0047] The injection / production manifold 1 is located inside the production casing 2. Its main function is to serve as the primary channel for gas flow during the injection / production process; in the embodiments provided in this application, it is used to inject nitrogen into the target injection / production well.

[0048] Packer 5 is connected to the lower end of injection / production manifold 1. Its main functions are: to isolate the annulus between the injection / production manifold and the production casing 2, allowing nitrogen to flow only from the injection / production manifold 1; to create an independent space between the injection / production manifold 1 and the production casing 2, facilitating the injection of annulus protection fluid 3; and to isolate high-pressure gases, potentially corrosive media (such as trace amounts of brine), from direct contact with the inner wall of the upper production casing 2 during the injection / production process, thus extending casing life.

[0049] Annular protective fluid 3: Fills the annular space between the production casing 2 and the injection / production manifold 1. Main functions: By injecting a protective fluid of appropriate density, a stable liquid column pressure is formed in the annulus to balance or slightly exceed the formation pressure, preventing formation fluids from intruding into the annulus; it prevents casing corrosion; simultaneously, it provides lubrication and buffering for the expansion and contraction of the injection / production manifold under temperature and pressure changes; by monitoring annular pressure changes, it can determine whether leakage has occurred in the production casing 2.

[0050] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 8 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data related to the gas tightness testing method for salt cavern gas storage. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a gas tightness testing method for salt cavern gas storage.

[0051] Those skilled in the art will understand that Figure 8 The structures shown are merely block diagrams of some structures related to the present application and do not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements. In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0052] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0053] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0054] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0055] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0056] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, etc., and are not limited to these.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for detecting the gas tightness of a salt cavern gas storage facility, characterized in that, include: Nitrogen gas is injected into the target injection-production well of the salt cavern gas storage through the injection-production manifold, and brine is discharged from the wellheads of other injection-production wells in the salt cavern gas storage until the gas-liquid interface of the target injection-production well reaches a set distance below the end of the production casing, at which point the discharge of brine stops; other injection-production wells refer to injection-production wells in the salt cavern gas storage other than the target injection-production well. Obtain the gas pressure and gas temperature at the wellhead of the target injection and production well, as well as the liquid pressure at the wellheads of other injection and production wells; When the gas temperature remains constant, the gas sealing performance of the target injection-production well in the salt cavern gas storage is determined based on the gas pressure and the liquid pressure within a set time period.

2. The method for detecting the gas tightness of a salt cavern gas storage tank according to claim 1, characterized in that, The maximum pressure of nitrogen injected into the target injection-production well of the salt cavern gas storage through the injection-production header is set as the maximum operating pressure of the salt cavern gas storage.

3. The method for detecting the gas tightness of a salt cavern gas storage tank according to claim 1, characterized in that, The gas pressure and the liquid pressure satisfy the formula: ; In the formula, This indicates the density of the gas. This indicates the density of the liquid. Indicates gas pressure. Indicates liquid pressure, Represents gravitational acceleration. This indicates the depth of the gas-liquid interface.

4. The method for detecting the gas tightness of a salt cavern gas storage tank according to claim 1, characterized in that, Determining the gas tightness of the target injection-production well in the salt cavern gas storage based on the gas pressure and liquid pressure within a set time period includes: Based on the gas pressure and the liquid pressure, determine the consistency change correlation index of the gas-liquid interface change in the target injection and production well; Determine whether the consistency change correlation index within the set time period meets the set conditions; If the consistency change correlation index within the set time period meets the set conditions, then the gas sealing performance of the target injection-production well of the salt cavern gas storage reaches the set standard. If the consistency change correlation index within the set time period does not meet the set conditions, then the gas sealing performance of the target injection-production well of the salt cavern gas storage has not reached the set standard.

5. The method for detecting the gas tightness of a salt cavern gas storage tank according to claim 4, characterized in that, The consistency change correlation index is expressed as: ; Indicates gas pressure. This indicates the pressure of the liquid.

6. A gas tightness detection device for a salt cavern gas storage facility, characterized in that, The method for detecting the gas tightness of a salt cavern gas storage facility according to any one of claims 1-5; the gas tightness detection device for the salt cavern gas storage facility includes: a surface casing, a production casing, an injection and production main pipe, a packer, a drain pipe, a gas transmission pipe, a data acquisition unit, and a processing unit; The surface casing is installed on the outermost layer of the target injection-production wellbore in the salt cavern gas storage facility; the production casing is installed inside the surface casing; the injection-production main pipe is installed inside the production casing; the packer is connected to the lower end of the injection-production main pipe and is installed between the injection-production main pipe and the production casing. The outer casing provides wellhead support and suspension points for the installation of the production casing; the production casing provides wellhead support and suspension points for the injection-production main pipe; the injection-production main pipe is used to inject nitrogen into the target injection-production well; the packer isolates the space between the injection-production main pipe and the production casing from nitrogen; the space formed by the production casing, the injection-production main pipe, and the packer is filled with annular protective fluid. The drainage pipeline is connected to the wellheads of other injection and production wells in the salt cavern gas storage facility; the drainage pipeline is used to discharge brine; the gas transmission pipeline is connected to the injection and production main pipeline; the gas transmission pipeline is used to transport nitrogen. The data acquisition unit is connected to the injection-production main pipe and other injection-production wells respectively; the data acquisition unit is used to obtain the gas pressure and gas temperature at the wellhead of the target injection-production well and the liquid pressure at the wellhead of other injection-production wells; The processing unit is connected to the data acquisition unit; the processing unit is used to determine the gas sealing performance of the target injection-production well of the salt cavern gas storage based on the gas pressure and the liquid pressure within a set time period when the gas temperature remains constant.

7. The gas tightness detection device for salt cavern gas storage according to claim 6, characterized in that, The data acquisition unit includes a gas pressure sensor, a liquid pressure sensor, and a temperature sensor; The gas pressure sensor is installed on the gas transmission pipeline to collect the gas pressure at the wellhead of the target injection-production well; the temperature sensor is installed at the wellhead of the target injection-production well to collect the gas temperature at the wellhead; and the liquid pressure sensor is installed on the drainage pipeline to collect the liquid pressure at the wellheads of other injection-production wells.

8. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method for detecting the gas tightness of a salt cavern gas storage facility as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the method for detecting the gas tightness of a salt cavern gas storage facility as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the method for detecting the gas tightness of a salt cavern gas storage facility as described in any one of claims 1-5.

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