Underground high-pressure hydrogen storage well structure
Through the multi-layer sealing structure and sensor detection system, the hydrogen leakage problem of underground hydrogen storage wells was solved, the tight connection between the wellbore and the wellhead head and the timely handling of hydrogen leakage were achieved, which improved the safety and stability of the hydrogen storage wells.
Patent Information
- Application Number
- CN202422934279.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-29
AI Technical Summary
After long-term use, existing underground hydrogen storage wells are prone to hydrogen leakage at the connection between the top of the wellbore and the wellhead head, resulting in insufficient sealing.
A multi-layer sealing structure is adopted, including a first closed groove, a second closed groove, a first sealing plug-in plate, a second sealing plug-in plate and a gasket, combined with a guide cavity and a guide tube, equipped with a sensor module to detect hydrogen leakage, and temporarily store the leaked hydrogen through a hydrogen collector to provide processing buffer time.
The sealing between the wellbore wellhead and the wellhead head is improved, hydrogen leaks are detected and handled in a timely manner, and the safety and stability of the hydrogen storage well are ensured.
Smart Images
Figure CN223425068U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an underground hydrogen storage well, in particular to an underground high-pressure hydrogen storage well structure. Background Art
[0002] Hydrogen is a renewable, clean and efficient secondary energy source. In order to reduce urban land occupation and solve safety, fire protection and other issues during hydrogen storage, high-pressure storage is usually used to store hydrogen underground.
[0003] When underground hydrogen storage wells store hydrogen, hydrogen is filled into the wellbore through pipelines. The top of the wellbore and the wellhead head are fixed with flanges and high-strength bolts, and gaskets are used for sealing at the joints. The top of the wellbore and the wellhead head are only sealed with annular gaskets at the joints. After long-term use, if the gasket ages, hydrogen leakage is likely to occur at the joint between the top of the wellbore and the wellhead head. Utility Model Content
[0004] The technical problem to be solved by the utility model is that, in view of the defect that the existing underground hydrogen storage wells are prone to hydrogen leakage, the utility model provides an underground high-pressure hydrogen storage well structure with good sealing.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an underground high-pressure hydrogen storage well structure, comprising a wellbore, the wellbore being buried inside an underground foundation well, a wellhead head being fixedly installed on the top of the wellbore, a gasket for sealing being installed between the wellbore and the wellhead head, and the structural feature of the structure being that a sealing assembly is provided between the wellbore and the wellhead head;
[0006] The sealing assembly includes a first sealing groove and a second sealing groove, which are sequentially provided on the wellhead of the wellbore from the inside to the outside, and a first sealing plug plate and a second sealing plug plate, which are provided on the wellhead cover. The first sealing plug plate is inserted into the first sealing groove to form a first layer of sealing, and the second sealing plug plate is inserted into the second sealing groove to form a second layer of sealing.
[0007] The gasket forms the final seal between the wellbore and the wellhead seal.
[0008] In this way, a multi-layer seal is formed between the wellhead of the wellbore and the wellhead cover through the first sealing groove, the second sealing groove, the first sealing insert, the second sealing insert and the gasket, which can well ensure the seal between the wellhead of the wellbore and the wellhead cover of the underground high-pressure hydrogen storage well.
[0009] Preferably, multiple groups of sealing grooves are respectively provided on the side walls of the first closed groove and the second closed groove, and the first sealing plug plate and the second sealing plug plate are provided with sealing gaskets that cooperate with the sealing grooves to further enhance the seal between the wellhead of the wellbore and the wellhead head.
[0010] Preferably, the top of the wellbore is provided with a first guide cavity and a second guide cavity, sequentially from the inside to the outside. The first guide cavity is arranged between the first and second closed grooves, and the second guide cavity is arranged outside the second closed groove. The first guide cavity is connected to the hydrogen collector via a first guide pipe to form a first leakage pipeline, and the second guide cavity is connected to the hydrogen collector via a second guide pipe to form a second leakage pipeline. The first leakage pipeline and the second leakage pipeline are respectively installed with a sensor module for detecting hydrogen, and the sensor module is electrically connected to a controller. In this way, the utility model can detect hydrogen leakage through the sensor module and promptly issue an alarm through the controller. The leaked hydrogen can also be temporarily stored in the hydrogen collector, providing buffer time for staff to handle it.
[0011] Preferably, the sensing module includes a sealing plug installed at the inlet of the hydrogen collector and a distance sensor for detecting the moving distance of the sealing plug. The sealing plug is installed in the first guide tube or the second guide tube via a spring. In the initial state, the sealing plug seals the inlet of the hydrogen collector. When hydrogen appears in the first guide tube or the second guide tube, the sealing plug compresses the spring under the action of hydrogen and opens the inlet of the hydrogen collector. At the same time, the distance sensor detects the change in the moving distance of the sealing plug and uploads it to the controller.
[0012] Preferably, an inner connecting ring is installed on the first guide tube or the second guide tube, the closing plug is installed in the inner connecting ring, a bottom ring is installed at the tail of the closing plug, one end of the spring is connected to the inner connecting ring, and the other end is connected to the bottom ring.
[0013] Preferably, the first closed groove and the second closed groove are both annular grooves, and the second sealing plug plate and the first sealing plug plate are both annular structures.
[0014] Preferably, the cross-sections of the sealing groove and the sealing gasket are triangular.
[0015] Preferably, the closing plug is a truncated cone structure.
[0016] Preferably, a lower flange is fixedly mounted on the wellbore, an upper flange is fixedly mounted on the wellhead cover, and the upper flange and the lower flange are connected by high-strength bolts.
[0017] Preferably, rubber is attached to both the second sealing insert plate and the first sealing insert plate to improve the sealing performance between the second sealing insert plate, the first sealing insert plate and the first sealing groove, the second sealing groove.
[0018] Compared with the existing technology, the underground high-pressure hydrogen storage well structure of the utility model has the following improvements and advantages:
[0019] When the wellbore and the wellhead cover are assembled, the wellbore and the wellhead cover are tightly connected and fixed, and the second sealing insert and the first sealing insert on the wellhead cover are respectively inserted into the corresponding second sealing groove and the inside of the first sealing groove on the wellbore, and the second sealing insert and the first sealing insert are tightly fitted with the inner walls of the second sealing groove and the first sealing groove under the action of the rubber attached thereto. At the same time, the sealing gasket is tightly fitted with the inner wall of the sealing groove under the action of the rubber attached thereto, and then the bottom outer ring position of the wellhead cover is fitted with the gasket to perform the last layer of sealing from the outer ring position of the wellhead cover. The connection between the wellhead cover and the wellbore is inserted into the second sealing groove and the inside of the first sealing groove by the second sealing insert and the first sealing insert and cooperated with the sealing gasket to be stuck into the inside of the sealing groove, and at the same time, the outer ring position of the wellhead cover is tightly fitted with the second sealing insert to achieve multi-level sealing, thereby improving the sealing effect at the connection between the wellbore and the wellhead cover.
[0020] 2) When the present invention is used, hydrogen is stored inside the wellbore, and the distance change data of the sealing plug at the entrance of the hydrogen collector is detected by the distance sensor inside the first guide pipe and the second guide pipe to reflect the hydrogen leakage situation: if hydrogen leakage occurs at the seal between the first sealing plug plate and the first closed groove, hydrogen enters the cavity of the first guide cavity from the inside of the wellbore, and then the hydrogen flows along the inside of the first guide pipe. At this time, the distance sensor in the first leakage pipeline detects the change in the distance data of its sealing plug, indicating that hydrogen leakage has occurred but has not yet leaked to the outside; if the seal between the second sealing plug plate and the second closed groove is aged, the distance sensor in the first leakage pipeline detects the change in the distance data of the ... However, if the seal between the first closed groove and the first sealing plug plate has not aged, the distance sensors in the first and second leakage pipelines will not detect changes in their sealing plug distance data; if the seal between the second sealing plug plate and the second closed groove and the seal between the first closed groove and the first sealing plug plate have aged, the leaked hydrogen will fill the second guide cavity and the first guide cavity and enter the first guide pipe and the second guide pipe, then the distance sensors in the first and second leakage pipelines will detect changes in their sealing plug distance data, indicating that hydrogen is about to leak to the outside, and the staff needs to immediately carry out corresponding processing work.
[0021] 3) When the utility model is used, if a small amount of hydrogen leaks, the leaked hydrogen can enter the hydrogen collector for temporary storage, providing a buffer time for hydrogen leakage treatment and improving the overall safety of the hydrogen storage well. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 This is a schematic structural diagram of the underground high-pressure hydrogen storage well structure of the utility model;
[0024] Figure 2 This is a schematic diagram of the connection structure between the wellhead cover and the wellbore of the utility model;
[0025] Figure 3 This is a schematic cross-sectional view of the connection structure between the wellhead cover and the wellbore of the utility model;
[0026] Figure 4 for Figure 3 A magnified schematic diagram of point A in the middle;
[0027] Figure 5 This is a schematic structural diagram of the first leakage pipeline of the utility model.
[0028] In the picture:
[0029] 1. Wellbore; 2. Lower head; 3. Wellhead head; 4. Upper flange; 5. Lower flange; 6. High-strength bolts; 7. Second sealing plate; 8. First sealing plate; 9. Sealing gasket; 10. First sealing groove; 11. Second sealing groove; 12. Sealing groove; 13. First guide cavity; 14. Second guide cavity; 15. First guide tube; 16. Second guide tube; 17. Gasket; 18. Distance sensor; 19. Inner ring; 20. Closing plug; 21. Spring; 22. Bottom ring; 23. Hydrogen collector. DETAILED DESCRIPTION
[0030] The present invention will be further described below in conjunction with specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.
[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0033] See also Figure 1 、 Figure 2 An embodiment of the underground high-pressure hydrogen storage well structure of the present invention includes a wellbore 1, which is buried inside an underground foundation well. The wellbore 1 is a hollow structure, with a lower head 2 fixedly mounted on the bottom of the wellbore 1 and a wellhead head 3 fixedly mounted on the top of the wellbore 1. A lower flange 5 is fixedly mounted on the wellbore 1, and an upper flange 4 is fixedly mounted on the wellhead head 3. The upper flange 4 and the lower flange 5 are threadedly connected via high-strength bolts 6, so that the wellbore 1 and the wellhead head 3 are connected and fixed by the high-strength bolts 6. A sealing assembly is provided between the wellbore 1 and the wellhead head 3, which can seal at the connection between the wellbore 1 and the wellhead head 3 to ensure the sealing of the connection between the wellbore 1 and the wellhead head 3.
[0034] See also Figure 3 、 Figure 4 The sealing assembly includes a first sealing groove 10 and a second sealing groove 11, which are sequentially formed at the top of the wellbore 1 from the inside out, and a first sealing plate 8 and a second sealing plate 7, which are fixedly mounted on the wellhead cover 3 from the inside out. The first sealing groove 10 and the second sealing groove 11 are both annular grooves, and the first sealing plate 8 and the second sealing plate 7 are both annular structures. The first sealing plate 8 can be inserted into the interior of the first sealing groove 10 and abut against the inner wall of the first sealing groove 10 to form a first layer of seal. The second sealing plate 7 can be inserted into the interior of the second sealing groove 11 and abut against the inner wall of the second sealing groove 11 to form a second layer of seal. Three groups of annular sealing grooves 12 are respectively provided on the side walls of both sides of the first sealing groove 10 and the second sealing groove 11. An annular sealing gasket 9 is fixedly installed on the inner and outer ring walls of the second sealing plug plate 7 and the first sealing plug plate 8. When the wellhead head 3 is fitted and fixed to the wellbore 1, the sealing gasket 9 is engaged with the corresponding sealing groove 12, and the sealing gasket 9 fits with the inner wall of the sealing groove 12. The cross-section of the sealing groove 12 is preferably triangular. The outer walls of the second sealing plug plate 7, the first sealing plug plate 8 and the sealing gasket 9 are all covered with rubber to ensure the sealing of the connection between the two. A gasket 17 is fixedly installed on the top of the wellbore 1. The gasket 17 is a circular ring structure. The outer circle of the bottom of the wellhead head 3 fits with the gasket 17 to form the last layer of sealing.
[0035] When assembling the wellbore 1 and the wellhead cover 3, the upper flange 4 and the lower flange 5 are respectively threadedly connected with the high-strength bolts 6 to tightly connect and fix the wellbore 1 and the wellhead cover 3. When the wellhead cover 3 is docked with the wellbore 1, the second sealing plug plate 7 and the first sealing plug plate 8 on the wellhead cover 3 are respectively inserted into the corresponding second sealing groove 11 and the first sealing groove 10. Since the outer walls of the second sealing plug plate 7 and the first sealing plug plate 8 are lined with rubber, when the second sealing plug plate 7 and the first sealing plug plate 8 are inserted into the second sealing groove 11 and the first sealing groove 10, the second sealing plug plate 7 and the first sealing plug plate 8 are respectively inserted into the second sealing groove 11 and the first sealing groove 10. When the wellhead seal 3 is in place, the second sealing plate 7 and the first sealing plate 8, under the action of the rubber attached thereto, tightly fit against the inner walls of the second sealing groove 11 and the first sealing groove 10. Simultaneously, the sealing gaskets 9 provided on the second sealing plate 7 and the first sealing plate 8 engage with the corresponding sealing grooves 12 of the second sealing groove 11 and the first sealing groove 10. Simultaneously, the sealing gaskets 9, under the action of the rubber attached thereto, tightly fit against the inner walls of the sealing grooves 12. The outer ring of the bottom of the wellhead seal 3 fits against the gasket 17, thus providing a final layer of sealing at the outer ring of the wellhead seal 3. Thus, the connection between the wellhead seal 3 and the wellbore 1 is achieved by inserting the second sealing plate 7 and the first sealing plate 8 into the second sealing groove 11 and the first sealing groove 10, and engaging the sealing gasket 9 into the sealing groove 12. Furthermore, the outer ring of the wellhead seal 3 tightly fits against the second sealing plate 7, thereby achieving a multi-layered seal and improving the sealing effect at the connection between the wellbore 1 and the wellhead seal 3.
[0036] See also Figure 4 、 Figure 5 The detection component includes a first guide cavity 13 and a second guide cavity 14 opened at the top of the wellbore 1, and a first guide tube 15 and a second guide tube 16 fixedly installed on the wellbore 1. The first guide cavity 13 and the second guide cavity 14 are both annular grooves. The first guide cavity 13 is located between the second closed groove 11 and the first closed groove 10, and the second guide cavity 14 is located outside the second closed groove 11. When the sealing component is sealed at the connection position between the wellbore 1 and the wellhead head 3, a closed chamber is formed inside the first guide cavity 13 and inside the second guide cavity 14. The first guide tube 15 and the second guide tube 16 are both hollow tubular structures. One end of the first guide tube 15 is connected to the first guide cavity 13, and one end of the second guide tube 16 is connected to the second guide cavity 14. The other end of the first guide tube 15 and the other end of the second guide tube 16 respectively extend to the outside of the wellbore 1 and are fixedly connected to the hydrogen collector 23. The hydrogen collector 23 is a spherical hollow structure with elasticity, which can be used to collect leaked hydrogen. The hydrogen collector 23 is preferably made of rubber.
[0037] Distance sensors 18 are fixedly installed inside the first guide tube 15 and the second guide tube 16. The distance sensors 18 are electrically connected to an external controller. When the hydrogen inside the wellbore 1 leaks outward through the connection between the wellbore 1 and the wellhead head 3, the hydrogen will enter the closed chamber formed by the first guide cavity 13 and the second guide cavity 14 in turn. At the same time, the distance sensors 18 in the first guide tube 15 and the second guide tube 16 can detect the hydrogen leaked from the corresponding closed chambers in turn.
[0038] An inner ring 19 is fixedly mounted inside each of the first and second guide tubes 15 and 16. One end of a spring 21 is fixedly connected to the inner ring 19. A closing plug 20 is movably mounted inside the inner ring 19. The closing plug 20 has a frustum-shaped structure, and its outer wall can contact and firmly abut against the inner wall of the inner ring 19. A bottom ring 22 is fixedly mounted at the bottom of the closing plug 20, and the bottom ring 22 is fixedly connected to the other end of the spring 21. When no hydrogen enters the first or second guide tube 15 or 16, the closing plug 20 closes the passage to the hydrogen collector 23. When hydrogen enters the first or second guide tube 15 or 16, the hydrogen presses against the closing plug 20, compressing the spring 21 and opening the closing plug 20. The hydrogen then enters the hydrogen collector 23 connected to the corresponding pipeline for temporary storage.
[0039] The working principle of this utility model is:
[0040] During assembly, the wellhead seal 3 is docked with the wellbore 1. When the wellhead seal 3 is docked with the wellbore 1, the second sealing plug plate 7 and the first sealing plug plate 8 on the wellhead seal 3 are respectively inserted into the corresponding second closed groove 11 and the first closed groove 10. The outer walls of the second sealing plug plate 7 and the first sealing plug plate 8 are lined with rubber. When the second sealing plug plate 7 and the first sealing plug plate 8 are inserted into the second closed groove 11 and the first closed groove 10, the second sealing plug plate 7 and the first sealing plug plate 8 are tightly fitted with the inner walls of the second closed groove 11 and the first closed groove 10 under the action of the rubber attached thereto. At the same time, the sealing The sealing gasket 9 is engaged with the second sealing groove 11 and the corresponding sealing groove 12 on the first sealing groove 10. The sealing gasket 9 is tightly fitted with the inner wall of the sealing groove 12 under the action of the rubber attached thereto. The outer ring position of the bottom of the wellhead head 3 is fitted with the gasket 17 to perform the final layer of sealing from the outer ring position of the wellhead head 3. The connection between the wellhead head 3 and the wellbore 1 is inserted into the second sealing groove 11 and the first sealing groove 10 through the second sealing insert plate 7 and the first sealing insert plate 8, and the sealing gasket 9 is engaged with the sealing groove 12. At the same time, the outer ring position of the wellhead head 3 is tightly fitted with the second sealing insert plate 7 to achieve multi-level sealing;
[0041] After the wellhead cover 3 is connected to the wellbore 1, the high-strength bolts 6 are rotated to thread the upper flange 4 and the lower flange 5. The wellhead cover 3 is tightly pressed and fixed to the wellbore 1 under the action of the high-strength bolts 6. After the wellbore 1 and the wellhead cover 3 are assembled, the wellbore 1 is buried in the underground foundation well, and the gap between the wellbore 1 and the foundation well is poured with concrete to complete the installation of the wellbore 1 underground.
[0042] Hydrogen is filled into the wellbore 1 through the air inlet pipe for storage. During the storage of hydrogen in the wellbore 1, if hydrogen leaks at the seal between the first sealing plug plate 8 and the first closed groove 10, the hydrogen enters the first guide cavity 13 from the wellbore 1 and flows along the first guide pipe 15. The hydrogen exerts a force on the sealing plug 20 in the first guide pipe 15. Under the action of the hydrogen, the sealing plug 20 compresses the spring 21 and moves upward, causing the leaked hydrogen to flow along the first guide pipe 15 to the outside of the wellbore 1 and enter the hydrogen collector 23 connected to the first guide pipe 15 for temporary storage. At the same time, the distance sensor 18 detects the distance between it and the sealing plug 20. Once a change in the distance data between it and the sealing plug 20 is detected, it means that hydrogen has leaked but has not yet leaked to the outside. The distance sensor 18 in the first guide pipe 15 issues an alarm through the control circuit, and the staff performs corresponding processing work.
[0043] If the seal between the second sealing insert 7 and the second sealing groove 11 ages but the seal between the first sealing groove 10 and the first sealing insert 8 does not age, the distance sensors in the first guide tube 15 and the second guide tube 16 cannot detect changes in the distance data of the sealing plugs 20 therein;
[0044] If the seal between the second sealing insert 7 and the second closed groove 11 and the seal between the first closed groove 10 and the first sealing insert 8 are aged, the leaked hydrogen will fill the second guide cavity 14 and the first guide cavity 13 and enter the first guide tube 15 and the second guide tube 16. At this time, the sealing plugs 20 inside the first guide tube 15 and the second guide tube 16 will move under the action of hydrogen, and the distance sensors 18 inside the first guide tube 15 and the second guide tube 16 can detect changes in distance data. This indicates that hydrogen has leaked and is about to leak to the outside, and the staff needs to immediately carry out corresponding processing work.
[0045] The above merely describes specific implementation of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed technical content, or modify equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall fall within the scope of protection of the technical scheme of the present application.
Claims
1. An underground high-pressure hydrogen storage well structure, comprising a wellbore (1), the wellbore being buried inside an underground foundation well, a wellhead cover (3) being fixedly mounted on the top of the wellbore, and a gasket (17) for sealing being mounted between the wellbore and the wellhead cover, characterized in that: A sealing assembly is provided between the wellbore and the wellhead cover; The sealing assembly comprises a first sealing groove (10) and a second sealing groove (11) which are sequentially provided on the wellhead of the wellbore from the inside to the outside, and a first sealing plug plate (8) and a second sealing plug plate (7) which are provided on the wellhead cover, wherein the first sealing plug plate (8) is inserted into the first sealing groove to form a first layer of sealing, and the second sealing plug plate is inserted into the second sealing groove to form a second layer of sealing; The gasket forms the final seal between the wellbore and the wellhead seal.
2. The underground high-pressure hydrogen storage well structure according to claim 1, characterized in that: Multiple groups of sealing grooves (12) are respectively provided on the side walls of the first sealing groove and the second sealing groove, and sealing gaskets (9) that cooperate with the sealing grooves (12) are provided on the first sealing insert plate and the second sealing insert plate.
3. The underground high-pressure hydrogen storage well structure according to claim 1, characterized in that: The top of the wellbore is provided with a first guide cavity (13) and a second guide cavity (14) in sequence from the inside to the outside. The first guide cavity (13) is arranged between the first closed groove and the second closed groove, and the second guide cavity is arranged outside the second closed groove. The first guide cavity is connected to the hydrogen collector (23) via a first guide pipe (15) to form a first leakage pipeline, and the second guide cavity is connected to the hydrogen collector (23) via a second guide pipe (16) to form a second leakage pipeline. Sensor modules for detecting hydrogen are respectively installed on the first leakage pipeline and the second leakage pipeline, and the sensor modules are electrically connected to a controller.
4. The underground high-pressure hydrogen storage well structure according to claim 3, characterized in that: The sensing module includes a sealing plug (20) installed at the inlet of the hydrogen collector and a distance sensor (18) for detecting the moving distance of the sealing plug. The sealing plug is installed in the first guide tube or the second guide tube via a spring (21). In the initial state, the sealing plug seals the inlet of the hydrogen collector. When hydrogen appears in the first guide tube or the second guide tube, the sealing plug compresses the spring under the action of hydrogen and opens the inlet of the hydrogen collector. At the same time, the distance sensor detects the change in the moving distance of the sealing plug and uploads it to the controller.
5. The underground high-pressure hydrogen storage well structure according to claim 4, characterized in that: An inner connecting ring (19) is installed on the first guide tube or the second guide tube, the closing plug is installed in the inner connecting ring (19), a bottom ring (22) is installed at the tail of the closing plug, one end of the spring is connected to the inner connecting ring, and the other end is connected to the bottom ring.
6. The underground high-pressure hydrogen storage well structure according to claim 1, characterized in that: The first closed groove and the second closed groove are both annular grooves, and the second sealing plug plate and the first sealing plug plate are both annular structures.
7. The underground high-pressure hydrogen storage well structure according to claim 2, characterized in that: The cross-sections of the sealing groove and the sealing gasket are triangular.
8. The underground high-pressure hydrogen storage well structure according to claim 4, characterized in that: The closing plug is a truncated cone structure.
9. The underground high-pressure hydrogen storage well structure according to any one of claims 1 to 8, characterized in that: A lower flange (5) is fixedly mounted on the wellbore, an upper flange (4) is fixedly mounted on the wellhead cover, and the upper flange and the lower flange are connected via high-strength bolts (6).
10. The underground high-pressure hydrogen storage well structure according to any one of claims 1 to 8, characterized in that: Rubber is attached to both the second sealing plug plate and the first sealing plug plate.