A sealing pressure test device for salt cavern gas storage

Abstract

The present invention discloses a salt cavern gas storage seal pressure test device, comprising: a plunger test tube (), comprising an outer sleeve, an air column tube and a glue cavity gap between the outer sleeve and the air column tube, the glue cavity gap being a cavity structure and provided with an electric heating wire on the inner side and filled with expansion glue on the inner side of the glue cavity gap, a compressed gas storage tank for storing nitrogen for gas pressurization inside the salt cavern, and a pressure test system, comprising a data analyzer electrically connected to an air pressure sensor and an air flow direction sensor, for real-time monitoring of air pressure changes in the salt cavern and recording air flow inflow. In the present invention, by arranging an expandable attachment on the surface of the plunger test tube, the entrance of the salt cavern is effectively blocked during the pressure test process, the contact surface between the plunger test tube and the salt cavern gas storage is evenly covered, and the uniformity and density of the sealing layer are improved. This expansion sealing mechanism can maintain a good sealing effect in a high-pressure environment and reduce the risk of pressure leakage.

Description

Technical Field

[0001] The invention relates to the technical field of salt cavern gas storage, and in particular to a sealing pressure testing device for a salt cavern gas storage. Background Art

[0002] The sealing pressure test device for salt cavern gas storage is mainly used to detect and verify the sealing performance of salt cavern gas storage. Salt cavern gas storage is a gas storage that uses natural or artificially mined salt mine cavities as gas storage, used to store natural gas, hydrogen and other gases. Salt caverns are ideal underground gas storage sites because of their good sealing and pressure resistance. The sealing test is one of the key steps to ensure the safe and reliable operation of salt cavern gas storage. The sealing pressure test device evaluates the sealing performance of salt caverns by injecting a test medium (such as water or gas) of a certain pressure into the salt cavern and monitoring the pressure changes over a certain period of time.

[0003] The main steps of the existing salt cavern gas storage seal pressure test include: Establishing a test port: Select one or more test points on the surface of the salt cavern gas storage reservoir, and drill holes to form a test port by pre-buried injection pipes and pressure sensors; Inject medium: Inject the test medium into the salt cavern through the test port pipeline and gradually increase the pressure to the design pressure.

[0004] Pressure holding: Maintain the design pressure for a period of time and record the pressure changes.

[0005] Leak detection: Analyze the sealing of the salt cavern based on the pressure change data. If the pressure drops quickly, there may be a leak.

[0006] Among them, salt cavern pressure testing usually requires a higher pressure, and traditional salt cavern gas storage sealing pressure testing devices usually use mechanical seals or packing seals for sealing. However, these traditional sealing methods often show insufficient sealing when facing the high-pressure environment and complex operating conditions of salt cavern gas storage. Seals may age, deform or be damaged due to long-term pressure and temperature changes, resulting in reduced sealing effect and increased risk of pressure leakage. Traditional sealing pressure testing devices usually rely only on a single pressure sensor or sealing test method when testing sealing performance. This test method may not be able to comprehensively and accurately evaluate the sealing effect of the entire salt cavern gas storage, especially when there are irregular structures or hidden areas inside the salt cavern. The sealing effect may not be monitored in real time during the test, resulting in the discovery of poor sealing problems after the test, thereby increasing maintenance costs and safety risks.

[0007] In view of this, research and improvement are carried out on the existing problems, and a salt cavern gas storage sealing pressure test device is provided to solve the current problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0008] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0009] To this end, the technical solution adopted by the present invention is: a salt cavern gas storage sealing pressure test device, comprising: The plunger test tube includes an outer sleeve, an air column tube, and a rubber cavity between the outer sleeve and the air column tube. The rubber cavity is a hollow structure and an electric heating wire is arranged inside the rubber cavity. The inner side of the rubber cavity is filled with expansion rubber. The outer sleeve and the air column tube are made of high-strength corrosion-resistant stainless steel or high-strength alloy material. The outer sleeve has a diameter and length matching the inlet of the salt cavern gas storage reservoir and the outer sleeve surface is provided with uniformly distributed expansion holes. The top end of the outer sleeve is provided with a sealing flange for contacting with the ground to provide basic sealing during initial installation; Among them, the expansion glue is coated on the outer surface of the gas column tube, and is composed of moisture-curing modified silicone glue or expansion polyurethane glue. The expansion glue expands and solidifies rapidly after contacting with moisture in the air to form a sealing layer with high sealing performance; the electric heating wire is located inside the glue cavity and is electrically connected to a PLC controller, which is used to heat the expansion glue through programmed control of current input to achieve precise control and regulation of the expansion process; the air pressure sensor and the airflow direction sensor are fixedly installed at the bottom end of the plunger test tube to monitor the air pressure and airflow direction; A compressed gas storage tank is used to store nitrogen for gas pressurization inside the salt cavern. A booster pump and a flow meter are connected to the end of the compressed gas storage tank, and the booster pump is connected to the top of the plunger test tube; The pressure test system includes a data analyzer electrically connected to the air pressure sensor and the air flow direction sensor, which is used to monitor the air pressure changes in the salt cavern in real time, record the air flow inflow, and perform real-time analysis on the collected data to provide salt cavern sealing performance and leakage direction position determination.

[0010] In this embodiment, the diameter and length of the plunger test tube are designed according to the inlet size of the salt cavern gas storage reservoir to ensure a close fit with the salt cavern gas storage reservoir and to ensure that it can penetrate deep into the salt cavern to reach the position required for testing.

[0011] In this embodiment, the expansion glue expands when heated and overflows through the expansion hole to the outside of the plunger test tube to form a sealing layer, thereby improving the sealing performance between the plunger test tube and the salt cavern gas storage reservoir. When the plunger test tube is inserted into the salt cavern gas storage reservoir and reaches a predetermined position, the expansion glue is heated by the internal heating structure. As the temperature rises, the expansion glue expands rapidly and overflows through the expansion hole to the outside of the test tube.

[0012] In this embodiment, the expansion holes of the outer sleeve are designed to be arranged in an inclined or spiral shape to optimize the flow path of the expansion glue overflowing through the expansion holes when heated and expanded, ensure the uniformity and density of the sealing layer, and further improve the sealing effect. The inclined or spiral arrangement helps the expansion glue to more evenly cover the contact surface between the plunger test tube and the salt cavern gas storage reservoir during the overflow process, thereby improving the uniformity and density of the sealing layer.

[0013] In this embodiment, the PLC controller is also integrated with a temperature feedback mechanism, which can automatically adjust the heating power of the electric heating wire according to the changes in the air pressure inside the salt cavern monitored by the air pressure sensor, so as to maintain the expansion glue within the optimal expansion temperature range, thereby accurately controlling the formation speed and quality of the sealing layer, adjusting its heating power, and ensuring that the sealing layer achieves the best quality during the formation process.

[0014] In this embodiment, the data analyzer has a data processing function, which is used to receive the air pressure data of the air pressure sensor at different time points in real time, and automatically draw a complete time and air pressure relationship diagram; in the air pressure filling stage, the data analyzer determines whether there is a leakage in the salt cavern by monitoring and analyzing the rate and trend of air pressure changes, and performs denoising and interpolation processing on the received data according to the built-in data processing module of the analyzer to improve the reliability and accuracy of the data.

[0015] In this embodiment, the data analyzer continues to monitor slight changes in air pressure in the pressure-maintaining state after the air pressure filling is completed, so as to accurately determine whether the sealing performance of the salt cavern is stable and whether there is potential leakage.

[0016] In a preferred example, the present invention can be further configured as follows: the data analyzer also has an alarm function, which automatically issues an alarm when an abnormal air pressure change is detected, prompting the operator to take corresponding measures. The alarm information should include a specific description of the abnormality, the time of occurrence and the recommended treatment measures, and the airflow direction sensor feedback information is monitored at a higher sampling frequency to determine the approximate leakage direction and location.

[0017] The beneficial effects achieved by the present invention are: 1. In the present invention, by arranging an expandable attachment on the surface of the plunger test tube, the entrance of the salt cavern is effectively blocked during the pressure test, and the contact surface between the plunger test tube and the salt cavern gas storage reservoir is evenly covered, thereby improving the uniformity and density of the sealing layer. This expansion and blocking mechanism can maintain a good sealing effect in a high-pressure environment and reduce the risk of pressure leakage.

[0018] 2. In the present invention, the real-time data of the air pressure sensor and the air flow direction sensor are used to draw an air pressure change graph, analyze the air pressure change rate and trend, realize leakage detection and monitor the air flow direction in real time as much as possible, identify potential poor sealing areas, help quickly locate the approximate direction of the leakage point, quickly evaluate the sealing effect, and provide instant feedback during the pressure test to facilitate timely adjustment and repair.

[0019] 3. In the present invention, moisture-curing modified silicone adhesive or expandable polyurethane adhesive is used as the expandable adhesive. These materials can expand and cure rapidly after contacting moisture in the air to form a sealing layer with high sealing performance. The structure is simple and the operation is convenient. It can effectively prevent gas leakage and ensure the sealing effect of the salt cavern gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a plunger test tube according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of a plunger test tube according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation state of a plunger test tube according to an embodiment of the present invention; Figure 5 The figure is a schematic diagram of the working process of a data analyzer according to an embodiment of the present invention.

[0021] Reference numerals: 100, plunger test tube; 110, outer sleeve; 120, gas column tube; 130, glue cavity; 140, expansion glue; 150, air pressure sensor; 160, air flow direction sensor; 111, expansion hole; 131, electric heating wire; 200, compressed gas storage tank; 210, booster pump; 220, flow meter; 300. Data analyzer. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0023] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0024] A sealing pressure testing device for a salt cavern gas storage provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0025] Combination Figure 1-Figure 5As shown, the present invention provides a salt cavern gas storage sealing pressure test device, comprising: The plunger test tube 100 comprises an outer sleeve 110, an air column tube 120 and a glue cavity 130 between the outer sleeve 110 and the air column tube 120. The glue cavity 130 is a hollow structure and an electric heating wire 131 is arranged inside. An expansion glue 140 is filled inside the glue cavity 130. The outer sleeve 110 and the air column tube 120 are made of high-strength corrosion-resistant stainless steel or high-strength alloy material. The outer sleeve 110 has a diameter and length matching the inlet of the salt cavern gas storage reservoir and the surface of the outer sleeve 110 is provided with uniformly distributed expansion holes 111. The top of the outer sleeve 110 is provided with a sealing flange for contacting with the ground to provide basic sealing during initial installation; Among them, the expansion glue 140 is coated on the outer surface of the gas column tube 120, and is composed of moisture-curing modified silicone glue or expansion polyurethane glue. The expansion glue 140 expands and solidifies rapidly after contacting with moisture in the air to form a sealing layer with high sealing performance; the electric heating wire 131 is located inside the glue cavity 130 and is electrically connected to the PLC controller, which is used to heat the expansion glue 140 through programmed control of current input to achieve precise control and regulation of the expansion process; the air pressure sensor 150 and the air flow direction sensor 160 are fixedly installed at the bottom end of the plunger test tube 100, and are used to monitor the air pressure and air flow direction; A compressed gas storage tank 200 is used to store nitrogen for gas pressurization inside the salt cavern. A booster pump 210 and a flow meter 220 are connected to the end of the compressed gas storage tank 200, and the booster pump 210 is connected to the top of the plunger test tube 100; The pressure test system includes a data analyzer 300 electrically connected to the air pressure sensor 150 and the air flow direction sensor 160, which is used to monitor the air pressure changes in the salt cavern in real time, record the air flow inflow, and perform real-time analysis on the collected data to provide salt cavern sealing performance and leakage direction position determination.

[0026] In this embodiment, the diameter and length of the plunger test tube 100 are designed according to the inlet size of the salt cavern gas storage reservoir to ensure a close fit with the salt cavern gas storage reservoir.

[0027] Specifically, the diameter of the plunger test tube 100 needs to be slightly smaller than or equal to the diameter of the salt cavern gas storage entrance to ensure that it can be smoothly inserted and form a seal; at the same time, its length needs to be long enough to ensure that it can penetrate deep into the salt cavern to reach the position required for testing.

[0028] In this embodiment, the expansion glue 140 expands when heated and overflows through the expansion hole 111 to the outside of the plunger test tube 100 to form a sealing layer, thereby improving the sealing performance between the plunger test tube 100 and the salt cavern gas storage reservoir.

[0029] Specifically, when the plunger test tube 100 is inserted into the salt cavern gas storage and reaches a predetermined position, the expansion glue 140 is heated by the internal heating structure. As the temperature rises, the expansion glue 140 expands rapidly and overflows to the outside of the test tube through the expansion hole 111.

[0030] Implementation Method 1 The device includes a plunger test tube 100, and the glue cavity 130 between the outer sleeve 110 of the plunger test tube 100 and the gas column tube 120 is filled with moisture-curing modified silicone glue. After the plunger test tube 100 is inserted into the salt cavern gas storage reservoir, the electric heating wire 131 in the glue cavity 130 heats the modified silicone glue. When the outer sleeve 110 is withdrawn, the modified silicone glue rapidly expands and solidifies after contacting with moisture in the air to form a sealing layer.

[0031] Implementation Method 2 Expandable polyurethane glue is used as the expandable glue 140, and an expansion hole 111 is provided on the surface of the outer sleeve 110 of the plunger test tube 100. When the polyurethane glue contacts moisture in the air after heating, it overflows through the expansion hole 111 and expands rapidly to form a sealing layer, thereby effectively blocking the entrance of the salt cavern gas storage reservoir.

[0032] In this embodiment, the expansion holes 111 of the outer sleeve 110 are designed to be arranged obliquely or spirally to optimize the flow path of the expansion glue 140 overflowing through the expansion holes 111 when heated and expanded, ensuring the uniformity and density of the sealing layer and further improving the sealing effect.

[0033] Specifically, the expansion holes 111 on the outer sleeve 110 are designed to be arranged in an inclined or spiral shape, so that the expansion glue 140 can be guided to overflow along a predetermined path when heated and expanded, rather than simply flowing out in a straight line. The inclined or spiral arrangement helps the expansion glue to more evenly cover the contact surface between the plunger test tube 100 and the salt cavern gas storage reservoir during the overflow process, thereby improving the uniformity and density of the sealing layer.

[0034] In this embodiment, the PLC controller is also integrated with a temperature feedback mechanism, which can automatically adjust the heating power of the electric heating wire 131 according to the changes in the internal air pressure of the salt cavern monitored by the air pressure sensor 150, so as to maintain the expansion glue 140 within the optimal expansion temperature range, thereby accurately controlling the formation speed and quality of the sealing layer.

[0035] Specifically, the PLC controller, as the core control unit of the system, is responsible for receiving real-time air pressure data from the air pressure sensor 150 and processing the data to generate control signals. At the same time, the PLC controller is also connected to the electric heating wire 131, and can directly adjust its heating power to ensure that the sealing layer achieves the best quality during the formation process.

[0036] In this embodiment, the data analyzer 300 has a data processing function, which is used to receive the air pressure data of the air pressure sensor 150 at different time points in real time, and automatically draw a complete time and air pressure relationship diagram; during the air pressure filling stage, the data analyzer 300 determines whether there is a leakage in the salt cavern by monitoring and analyzing the rate and trend of air pressure changes.

[0037] In this embodiment, the data analyzer 300 continues to monitor slight changes in air pressure in the pressure-maintaining state after the air pressure filling is completed, so as to accurately determine whether the sealing performance of the salt cavern is stable and whether there is potential leakage.

[0038] In this embodiment, the data analyzer 300 also has an alarm function, which automatically issues an alarm when an abnormal air pressure change is detected, prompting the operator to perform corresponding processing.

[0039] Specifically, the data analyzer 300 is connected to the air pressure sensor 150 by wire or wireless means, and receives the air pressure data transmitted by the air pressure sensor 150 in real time. The data is sorted and stored according to the timestamp to ensure the accuracy and time continuity of the data. The data processing module built into the data analyzer performs denoising and interpolation processing on the received data to improve the reliability and accuracy of the data. Subsequently, the processed data is automatically converted into a time and air pressure relationship diagram using a graphics drawing algorithm, and displayed in real time on the display screen.

[0040] Furthermore, an efficient database management system is used to store air pressure data, and Python, MATLAB or dedicated data analysis software is used to implement data processing and graph drawing functions. The graphical interface is friendly and supports zooming, panning and annotation functions, which is convenient for operators to observe and analyze Leakage monitoring during the air pressure filling stage: During the air pressure filling stage, the data analyzer 300 not only receives air pressure data in real time, but also monitors and analyzes the rate and trend of air pressure changes through built-in algorithms. Reasonable thresholds and judgment logic are set. When the rate of change of air pressure is abnormal (such as a sudden drop) or the trend does not meet expectations (such as not reaching the predetermined pressure level), it is determined that there may be a leak. The differential algorithm is used to calculate the rate of change of air pressure, and the time series analysis technology is combined to identify abnormal trends. Set multi-level alarm thresholds to issue different levels of alarms according to the size of the possibility of leakage.

[0041] Sealing performance monitoring under pressure maintenance: After the air pressure filling is completed, the data analyzer 300 continues to monitor the slight changes in air pressure at a higher sampling frequency. By comparing the current air pressure value with the preset stable air pressure range, the sealing performance of the salt cavern is evaluated to see if it is stable. If the air pressure continues to deviate from the stable range, it indicates a potential leakage risk. A high-precision air pressure sensor and a stable data acquisition system are used to ensure the accuracy of the monitoring data. A sensitive threshold detection mechanism is set to respond quickly to slight air pressure changes.

[0042] Alarm function for abnormal air pressure changes: The data analyzer 300 has a built-in alarm module. When abnormal air pressure changes (such as sudden drops, continuous fluctuations, etc.) are detected, the alarm mechanism is automatically triggered. The alarm methods can include sound alarms, light signal alarms, and sending alarm signals to the remote monitoring center. At the same time, the alarm information should include a specific description of the abnormality, the time of occurrence, and the recommended treatment measures. The airflow direction sensor returns information with a higher sampling frequency to determine the approximate leakage direction and location.

[0043] The working principle and use process of the present invention: The plunger test tube 100 is inserted into the inlet of the salt cavern gas storage reservoir, and the top sealing flange of the outer sleeve 110 contacts the ground to provide basic sealing.

[0044] Ensure that the diameter and length of the outer casing 110 match the inlet of the salt cavern gas storage.

[0045] Glue filling and heating: Fill the expansion glue 140 into the glue cavity 130 between the outer sleeve 110 and the gas column tube 120. Start the electric heating wire 131, and control the heating power through the PLC controller to heat the expansion glue 140 to a predetermined temperature.

[0046] Expansion and sealing: When the outer sleeve 110 is withdrawn, the expansion glue 140 rapidly expands and solidifies after contacting with moisture in the air, and overflows through the expansion holes 111 on the outer sleeve 110 to form a sealing layer. The expansion holes 111 are designed to be arranged in an inclined or spiral shape to ensure that the expansion glue 140 evenly covers the contact surface to form a dense sealing layer.

[0047] Air pressure monitoring and pressure testing: nitrogen is injected into the salt cavern through the compressed gas storage tank 200 to monitor the air pressure and air flow direction. The air pressure sensor 150 and the air flow direction sensor 160 monitor the air pressure changes in real time and transmit the data to the data analyzer 300.

[0048] Data analysis and judgment: The data analyzer 300 receives real-time data from the air pressure sensor 150 and the air flow direction sensor 160, draws an air pressure change graph, and analyzes the air pressure change rate and trend. During the air pressure filling stage and the pressure holding state, the air pressure change is analyzed to determine the sealing effect and leakage. If an abnormal air pressure change is detected, the data analyzer 300 automatically triggers an alarm to prompt the operator to handle it.

[0049] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A salt cavern gas storage sealing pressure test device, characterized in that: include: A plunger test tube (100) comprises an outer sleeve (110), an air column tube (120), and a glue cavity (130) located between the outer sleeve (110) and the air column tube (120); the glue cavity (130) is a hollow structure and an electric heating wire (131) is provided inside the glue cavity (130); an expansion glue (140) is added inside the glue cavity (130); the outer sleeve (110) and the air column tube (120) are made of high-strength corrosion-resistant stainless steel or high-strength alloy material; the outer sleeve (110) has a diameter and length matching the inlet of a salt cavern gas storage reservoir and the surface of the outer sleeve (110) is provided with uniformly distributed expansion holes (111); a sealing flange is provided at the top end of the outer sleeve (110) for contacting the ground during initial installation to provide a basic seal; The expansion glue (140) is coated on the outer surface of the gas column tube (120) and is composed of moisture-curing modified silicone glue or expansion polyurethane glue. The expansion glue (140) rapidly expands and solidifies after contacting moisture in the air to form a sealing layer with high sealing performance. The electric heating wire (131) is located inside the glue cavity (130) and is electrically connected to a PLC controller, and is used to heat the expansion glue (140) through programmed control of current input to achieve precise control and regulation of the expansion process. The air pressure sensor (150) and the air flow direction sensor (160) are fixedly installed at the bottom end of the plunger test tube (100) and are used to monitor the air pressure and air flow direction. A compressed gas storage tank (200) is used to store nitrogen for gas pressurization inside the salt cavern. The end of the compressed gas storage tank (200) is connected to a booster pump (210) and a flow meter (220), and is connected to the top end of the plunger test tube (100) through the booster pump (210); The pressure test system comprises a data analyzer (300) electrically connected to an air pressure sensor (150) and an air flow direction sensor (160), and is used to monitor the air pressure change in the salt cavern in real time, record the air flow inflow, and perform real-time analysis on the collected data to provide the salt cavern sealing performance and leakage direction position determination.

2. A salt cavern gas storage sealing pressure test device according to claim 1, characterized in that: The diameter and length of the plunger test tube (100) are designed according to the inlet size of the salt cavern gas storage reservoir, so as to ensure a close fit with the salt cavern gas storage reservoir.

3. A salt cavern gas storage sealing pressure test device according to claim 1, characterized in that: The expansion glue (140) expands when heated and overflows through the expansion hole (111) to the outside of the plunger test tube (100) to form a sealing layer, thereby improving the sealing performance between the plunger test tube (100) and the salt cavern gas storage reservoir.

4. A salt cavern gas storage sealing pressure test device according to claim 1, characterized in that: The expansion holes (111) of the outer sleeve (110) are designed to be arranged in an inclined or spiral shape, so as to optimize the flow path of the expansion glue (140) overflowing through the expansion holes (111) when heated and expanded, thereby ensuring the uniformity and density of the sealing layer and further improving the sealing effect.

5. The sealing pressure testing device for a salt cavern gas storage according to claim 1 is characterized in that: The PLC controller is also integrated with a temperature feedback mechanism, which can automatically adjust the heating power of the electric heating wire (131) according to the change of air pressure inside the salt cave monitored by the air pressure sensor (150), so as to maintain the expansion glue (140) within the optimal expansion temperature range, thereby accurately controlling the formation speed and quality of the sealing layer.

6. The sealing pressure testing device for a salt cavern gas storage according to claim 1 is characterized in that: The data analyzer (300) has a data processing function, and is used to receive the air pressure data of the air pressure sensor (150) at different time points in real time, and automatically draw a complete time and air pressure relationship diagram; During the gas pressure filling stage, the data analyzer (300) determines whether there is leakage in the salt cavern by monitoring and analyzing the rate and trend of gas pressure change.

7. The sealing pressure testing device for a salt cavern gas storage according to claim 1, characterized in that: The data analyzer (300) continues to monitor slight changes in air pressure in a pressure-maintaining state after the air pressure filling is completed, so as to accurately determine whether the sealing performance of the salt cavern is stable and whether there is potential leakage.

8. The sealing pressure testing device for a salt cavern gas storage according to claim 1, characterized in that: The data analyzer (300) also has an alarm function, and automatically issues an alarm when an abnormal air pressure change is detected, prompting the operator to perform corresponding processing.

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