Bottom sealing device and bottom sealing method for novel energy storage of depleted gas well

Abstract

The invention relates to the technical field of mine type gravity energy storage, in particular to a bottom sealing device for novel energy storage of a depleted gas well, a bottom sealing method, a bottom sealing object and an extraction shaft. During use, the bottom sealing object is placed in the depleted gas well, and the extraction shaft is used for placing the bottom sealing object in the depleted gas well; the bottom sealing object comprises an outer cylinder and an internal supporting assembly, the internal supporting assembly is arranged in the outer cylinder, and the internal supporting assembly is used for applying outward acting force to the outer cylinder; the extraction shaft comprises a shaft body and a clamping block, and the clamping block is fixedly connected with the lower end of the shaft body; the bottom sealing object is composed of an outer cylinder and an internal supporting assembly, the outer cylinder is provided with a flexible leather cup and a sealing rubber ring, it is ensured that the bottom sealing object is tightly attached to the gas well wall, the internal supporting assembly comprises a cylinder, a supporting rod and a driving assembly, and effective control is achieved through a hydraulic system and a power assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of mine - type gravity energy storage, and particularly to a bottom - sealing device and a bottom - sealing method for a new - type energy storage in depleted gas wells. Background Art

[0002] The new - type gravity energy storage technology is a rapidly developing field in recent years, mainly including gravity piston - driven pumped - storage technology, mountain railway - type gravity energy storage technology, tower crane - type gravity energy storage technology, and mine - type gravity energy storage technology. Compared with the traditional pumped - storage technology, these technologies have significant advantages, such as avoiding the limitation of geological conditions, having a zero self - discharge rate, a larger energy storage capacity ratio, a high discharge depth, and a high cycle conversion efficiency (exceeding 90%).

[0003] In the mine - type gravity energy storage technology, using depleted gas wells for energy storage is considered a potential method. This method has advantages such as a small footprint, low transformation difficulty, and little influence from the external environment compared with other types of gravity energy storage technologies. Therefore, it has gradually attracted the attention of the industry.

[0004] During the process of using depleted gas wells for energy storage, the gas wells need to be comprehensively transformed. The bottom - sealing material and the device for extracting the bottom - sealing material are one of the most important parts of the transformation. The design and application of this component are similar to those of the bridge plugs used in oil and gas well well - testing, completion, and other operations. The bridge plug can solve problems such as setting, fishing, and releasing, but its operation is complex and the success rate is low, which limits its application in sealing the bottom of depleted gas wells. Summary of the Invention

[0005] The technical problem to be solved by the present invention is the complexity and low success rate of the traditional bridge plug in operation. The purpose is to provide a bottom - sealing device and a bottom - sealing method for a new - type energy storage in depleted gas wells, achieving effects such as fewer construction processes, a short cycle, accurate packer setting positions, and easy release.

[0006] The present invention is achieved through the following technical solutions:

[0007] A bottom - sealing device for a new - type energy storage in depleted gas wells includes: a bottom - sealing material and an extraction shaft. When in use, the bottom - sealing material is placed in the depleted gas well, and the extraction shaft is used to place the bottom - sealing material into the depleted gas well;

[0008] The bottom - sealing material includes: an outer cylinder and an internal support assembly. The internal support assembly is arranged inside the outer cylinder, and the internal support assembly is used to apply an outward force to the outer cylinder and make the outer side of the outer cylinder fit with the well wall of the depleted gas well. When the outer side of the outer cylinder fits with the well wall of the depleted gas well, the upper part and the lower part of the outer cylinder are not connected;

[0009] The extraction shaft includes: a shaft body and a clamping block, the clamping block is fixedly connected to the lower end of the shaft body, and the clamping block is used to connect with the internal support assembly and apply a force to the internal support assembly.

[0010] Specifically, the outer cylinder includes: a flexible leather cup and a sealing rubber ring, a plurality of the sealing rubber rings are fixedly connected to the outer side surface of the flexible leather cup, and the sealing rubber rings are coaxially arranged with the flexible leather cup.

[0011] Specifically, the internal support assembly includes:

[0012] A cylinder, the upper end surface of which is provided with a through hole adapted to the clamping block, and the diameter of the shaft body is smaller than the width of the through hole;

[0013] Support rods, the lower ends of a plurality of the support rods are rotatably connected to the lower part of the cylinder through spherical rotary joints, the rotation plane of the support rods is located in the diameter plane of the cylinder, and the upper ends of the support rods are fixedly connected to the inner side surface of the flexible leather cup;

[0014] A drive assembly, which is arranged inside the cylinder, and the clamping block passes through the through hole to apply a force to the drive assembly;

[0015] When plugging a depleted gas well is required, the drive assembly applies a force to the support rods to drive the upper ends of the support rods to move away from the cylinder.

[0016] Specifically, the drive assembly includes:

[0017] A power assembly, which is arranged inside the cylinder, and the lower part of the power assembly is connected to the bottom surface of the cylinder;

[0018] An annular liquid bag, which is arranged between the power assembly and the inner side surface of the cylinder, and hydraulic oil is filled in the annular liquid bag;

[0019] A liquid pipe, the first end of which is communicated with the annular liquid bag, the second end of the liquid pipe passes through the side wall of the cylinder and the spherical rotary joint and is arranged inside the support rod, and both the first end and the second end of the liquid pipe are arranged above the spherical rotary joint;

[0020] The power assembly applies a force to the annular liquid bag, and the hydraulic oil enters the liquid pipe and drives the liquid pipe to straighten.

[0021] Furthermore, the drive assembly further includes: a return spring, the two ends of which are respectively connected to the cylinder and the support rod, and the return spring applies a force to the support rod to drive the upper end of the support rod to move towards the cylinder.

[0022] Optionally, the power assembly includes:

[0023] A first semi-circular block and a second semi-circular block, the central axes of the first semi-circular block and the second semi-circular block are both vertically arranged, the rectangular surface of the first semi-circular block is parallel to the rectangular surface of the second semi-circular block, the lower end of the first semi-circular block is slidably connected to the bottom surface of the cylinder through a sliding device, the lower end of the second semi-circular block is slidably connected to the bottom surface of the cylinder through a sliding device, and the sliding directions of the first semi-circular block and the second semi-circular block are both perpendicular to their rectangular surfaces;

[0024] A rotating plate, which is arranged between the first semi-circular block and the second semi-circular block, and the rotating plate is rotatably connected to the bottom surface of the cylinder through a rotating device, the rotating axis of the rotating plate is perpendicular to the bottom surface of the cylinder, and a clamping groove adapted to the clamping block is arranged at the upper end of the rotating plate;

[0025] The rotating plate has two working states:

[0026] A blocking state, in which the rotating plate fits with the rectangular surfaces of the first semi-circular block and the second semi-circular block, and applies an outward acting force to the first semi-circular block and the second semi-circular block to drive the first semi-circular block and the second semi-circular block to move outward;

[0027] A non-blocking state, in which the rotating plate is separated from the first semi-circular block and the second semi-circular block, and the rotating plate does not apply a force to the first semi-circular block and the second semi-circular block.

[0028] Further, the power assembly further includes a telescopic plate, a first telescopic side of the telescopic plate is fixedly connected to the first semi-circular block, and a second telescopic side of the telescopic plate is fixedly connected to the second semi-circular block;

[0029] When the rotating plate is in the blocking state, the telescopic plate is in an elastic state, and the telescopic plate applies an inward acting force to both the first semi-circular block and the second semi-circular block;

[0030] When the rotating plate is in the non-blocking state, the telescopic plate is in its original length state.

[0031] Optionally, both ends of the rotating plate are provided with arc-shaped structures, and arc-shaped clamping grooves are arranged on the rectangular surfaces of the first semi-circular block and the second semi-circular block;

[0032] When the rotating plate is in the blocking state, both ends of the rotating plate are respectively clamped in the arc-shaped clamping grooves.

[0033] Further, the extraction shaft further includes a force shaft, the lower end of the force shaft is fixedly connected to the upper end of the shaft body, and the length of the shaft body is greater than the distance between the upper end surface of the rotating plate and the upper end surface of the cylinder;

[0034] The through hole is a rectangular hole, the clamping block is a rectangular block, and the clamping groove is a rectangular groove.

[0035] A bottom sealing method for a new energy storage in depleted gas wells, based on a bottom sealing device for a new energy storage in depleted gas wells, the bottom sealing method comprising:

[0036] After passing the clamping block through the through hole, rotate the extraction shaft so that the clamping block is arranged out of alignment with the through hole;

[0037] The clamping block fits against the upper end face of the cylinder, and the bottom sealing material is placed into the depleted gas well through the extraction shaft and reaches the set position;

[0038] Lower the extraction shaft and rotate the extraction shaft to engage the clamping block with the clamping groove;

[0039] Continue to rotate the extraction shaft, drive the rotating plate to rotate so that the first semi-circular block and the second semi-circular block move outward to squeeze the annular liquid bladder;

[0040] Hydraulic oil enters the liquid pipe to drive the upper end of the support rod to move outward to fit the outer cylinder against the wall of the depleted gas well;

[0041] Raise the extraction shaft. After the clamping block is disengaged from the rotating plate, adjust the position of the extraction shaft until the clamping block is withdrawn from the through hole and the extraction shaft is removed.

[0042] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0043] The bottom sealing material in the present invention is composed of an outer cylinder and an internal support assembly. The outer cylinder is equipped with a flexible leather cup and a sealing rubber ring to ensure close fit with the gas well wall. The internal support assembly includes a cylinder, a support rod, and a drive assembly, and is effectively controlled through a hydraulic system and a power assembly.

[0044] Through the design of the internal support assembly, the outer cylinder is precisely deployed in the depleted gas well, enabling the flexible leather cup and the sealing rubber ring to fit tightly against the well wall, improving the adaptability and sealing performance of the bottom sealing device, achieving efficient plugging, and reducing the risk of gas leakage.

[0045] Through the cooperation of the extraction shaft and the internal support assembly, the purpose of placing the bottom sealing material into the depleted gas well and sealing the depleted gas well is achieved. After the above operations are completed, the extraction shaft can be removed from the depleted gas well, enhancing the flexibility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the drawings are included in this specification and form a part of this specification, and do not constitute a limitation on the embodiments of the present invention.

[0047] Figure 1It is a schematic structural diagram of the sealing material of a bottom sealing device for a new energy storage in depleted gas wells according to the present invention.

[0048] Figure 2 It is a schematic structural diagram of the extraction shaft of a bottom sealing device for a new energy storage in depleted gas wells according to the present invention.

[0049] Figure 3 It is a cross-sectional view of the internal support assembly according to the present invention.

[0050] Figure 4 It is a top view of the internal support assembly according to the present invention.

[0051] Reference numerals: 1 - internal support assembly, 2 - outer cylinder, 3 - extraction shaft;

[0052] 11 - cylinder, 12 - power assembly, 13 - annular liquid sac, 14 - support rod, 15 - liquid pipe, 16 - spherical rotary joint, 17 - return spring, 18 - through hole, 121 - first semi-circular block, 122 - second semi-circular block, 123 - arc-shaped card slot, 124 - telescopic plate, 125 - rotating plate, 126 - card slot, 127 - sliding device, 21 - flexible leather cup, 22 - sealing rubber ring, 31 - block, 32 - shaft body, 33 - force shaft. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and implementation manners. It can be understood that the specific implementation manners described herein are only used to explain the relevant content and do not limit the present invention.

[0054] In addition, it should be noted that only parts related to the present invention are shown in the drawings for the convenience of description.

[0055] In this application, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0057] Without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0058] Embodiment 1

[0059] As Figure 1 、 Figure 2 shown, a bottom-sealing device for a new energy storage in depleted gas wells includes: a bottom-sealing material and an extraction shaft 3. During use, the bottom-sealing material is placed in the depleted gas well, and the extraction shaft 3 is used to place the bottom-sealing material into the depleted gas well; through the detachable connection between the extraction shaft 3 and the bottom-sealing material, the extraction shaft 3 is connected to the bottom-sealing material when placing the bottom-sealing material, and the bottom-sealing material is separated from the extraction shaft 3 after placement is completed, and the extraction shaft 3 is withdrawn. When it is necessary to remove the bottom-sealing material, the extraction shaft 3 is inserted into the depleted gas well again, and then the extraction shaft 3 is connected to the bottom-sealing material and the bottom-sealing material is withdrawn together.

[0060] The bottom-sealing material includes: an outer cylinder 2 and an internal support assembly 1. The internal support assembly 1 is arranged inside the outer cylinder 2, and the internal support assembly 1 is used to apply an outward acting force to the outer cylinder 2 and make the outer side surface of the outer cylinder 2 fit against the well wall of the depleted gas well. When the outer side surface of the outer cylinder 2 fits against the well wall of the depleted gas well, the upper and lower parts of the outer cylinder 2 are not communicated;

[0061] The extraction shaft 3 includes: a shaft body 32 and a clamping block 31. The clamping block 31 is fixedly connected to the lower end of the shaft body 32, and the clamping block 31 is used to connect to the internal support assembly 1 and apply an acting force to the internal support assembly 1.

[0062] By connecting the clamping block 31 to the internal support member and performing different operations on the shaft body 32, different technical purposes are achieved.

[0063] The outer cylinder 2 includes: a flexible leather cup 21 and a sealing rubber ring 22. A plurality of sealing rubber rings 22 are fixedly connected to the outer side surface of the flexible leather cup 21, and the sealing rubber rings 22 are coaxially arranged with the flexible leather cup 21. After the sealing rings are tensioned, multiple seals can be formed to improve the sealing performance.

[0064] The internal support component is a key structure. It should not only enable the detachable connection between the extraction shaft 3 and the sealed object, but also be able to expand the outer cylinder 2. As Figure 3 and Figure 4 shown, the internal support assembly 1 includes: a cylinder 11, a support rod 14, and a drive assembly.

[0065] A through hole 18 adapted to the block 31 is provided on the upper end surface of the cylinder 11, and the diameter of the shaft body 32 is smaller than the width of the through hole 18; the lower ends of a plurality of support rods 14 are rotatably connected to the lower part of the cylinder 11 through spherical rotary joints 16, the rotation plane of the support rods 14 is located in the diameter plane of the cylinder 11, and the upper ends of the support rods 14 are fixedly connected to the inner side surface of the flexible leather cup 21;

[0066] The detachable connection between the extraction shaft 3 and the sealed object is realized through the through hole 18 and the block 31. When connection is required, the block 31 is passed through the through hole 18, and then the shaft body 32 is rotated to misalign the block 31 with the through hole 18, then the cylinder 11 can be lifted, thus achieving the purpose of lifting the entire sealed object.

[0067] The drive assembly is arranged inside the cylinder 11, and the block 31 passes through the through hole 18 to apply a force to the drive assembly; when plugging a depleted gas well is required, the drive assembly applies a force to the support rod 14 to drive the upper end of the support rod 14 to move away from the cylinder 11.

[0068] The expansion of the outer cylinder 2 can be realized through the drive assembly and the support rod 14. Specifically, it is realized through the drive assembly. The drive assembly includes: a power assembly 12, an annular liquid bag 13, and a liquid pipe 15.

[0069] The power assembly 12 is arranged inside the cylinder 11, and the lower part of the power assembly 12 is connected to the bottom surface of the cylinder 11; the annular liquid bag 13 is arranged between the power assembly 12 and the inner side surface of the cylinder 11, and hydraulic oil is filled in the annular liquid bag 13; the first end of the liquid pipe 15 is communicated with the annular liquid bag 13, the second end of the liquid pipe 15 passes through the side wall of the cylinder 11 and the spherical rotary joint 16 and is arranged inside the support rod 14, and both the first end and the second end of the liquid pipe 15 are arranged above the spherical rotary joint 16.

[0070] By applying a force to the annular liquid bag 13 through the power assembly 12, after the power assembly 12 squeezes the annular liquid bag 13, the hydraulic oil in the annular liquid bag 13 is squeezed into the liquid pipe 15. After the flexible hydraulic pipe is squeezed into the hydraulic oil, under the action of the water pressure, the liquid pipe 15 is driven to straighten. When the hydraulic pipe needs to be straightened, the purpose of driving the support rod 14 to rotate will be achieved.

[0071] In addition, if the bottom seal needs to be removed from the depleted gas well, the support rod 14 needs to be reset. Therefore, the driving assembly also includes a reset spring 17, and the two ends of the reset spring 17 are respectively connected to the cylinder 11 and the support rod 14. The reset spring 17 applies a force to the support rod 14 to drive the upper end of the support rod 14 to move toward the direction close to the cylinder 11.

[0072] That is, when the support rod 14 is stretched, the return spring 17 is always in a stretched state. When the bottom cover needs to be removed, the power assembly 12 is controlled not to exert force on the annular liquid capsule 13, resulting in the disappearance of the pressure in the liquid pipe 15. Under the action of the elastic force, the hydraulic oil flows back into the annular liquid capsule 13 and the support rod 14 is retracted.

[0073] Embodiment 2

[0074] A feasible structure of the power assembly 12 is provided below. The power assembly 12 includes a rotating plate 125 , a first semicircular block 121 and a second semicircular block 122 .

[0075] The central axes of the first semicircular block 121 and the second semicircular block 122 are both arranged vertically, the rectangular surface of the first semicircular block 121 is parallel to the rectangular surface of the second semicircular block 122, the lower end of the first semicircular block 121 is slidably connected to the bottom surface of the cylinder 11 through the sliding device 127, and the lower end of the second semicircular block 122 is slidably connected to the bottom surface of the cylinder 11 through the sliding device 127, and the sliding directions of the first semicircular block 121 and the second semicircular block 122 are both perpendicular to their rectangular surfaces;

[0076] The rotating plate 125 is arranged between the first semicircular block 121 and the second semicircular block 122, and the rotating plate 125 is rotatably connected to the bottom surface of the cylinder 11 through a rotating device. The rotating axis of the rotating plate 125 is perpendicular to the bottom surface of the cylinder 11, and the upper end of the rotating plate 125 is provided with a slot 126 adapted to the block 31.

[0077] like Figure 4 As shown, by rotating the rotating plate 125, the rotating plate 125 makes the first semicircular block 121 and the second semicircular block 122 move up and down (the orientation in the figure), and the outer annular surfaces of the first semicircular block 121 and the second semicircular block 122 squeeze the annular liquid capsule 13, and then the hydraulic oil can enter the liquid pipe 15. The moving distance of the first semicircular block 121 and the second semicircular block 122, the volume of the hydraulic oil discharged by the annular liquid capsule 13, the length of the liquid pipe 15, etc. need to be obtained by technicians according to experiments, so that the liquid pipe 15 has enough pressure to support the support rod 14.

[0078] The rotating plate 125 has two working states:

[0079] Blocked state ( Figure 4The rotating plate 125 therein is in a vertical state), and the rotating plate 125 fits against the rectangular surfaces of the first semi-circular block 121 and the second semi-circular block 122, and applies an outward force to the first semi-circular block 121 and the second semi-circular block 122 to drive the first semi-circular block 121 and the second semi-circular block 122 to move outward.

[0080] Non-blocking state ( Figure 4 in which the rotating plate 125 is in a horizontal state), the rotating plate 125 is separated from the first semi-circular block 121 and the second semi-circular block 122, and the rotating plate 125 does not apply a force to the first semi-circular block 121 and the second semi-circular block 122.

[0081] In order to be able to pull back the first semi-circular block 121 and the second semi-circular block 122 during disassembly, the power assembly 12 further includes a telescopic plate 124. The first telescopic edge of the telescopic plate 124 is fixedly connected to the first semi-circular block 121, and the second telescopic edge of the telescopic plate 124 is fixedly connected to the second semi-circular block 122;

[0082] When the rotating plate 125 is in the blocking state, the telescopic plate 124 is in a state of elastic force, and the telescopic plate 124 applies an inward force to both the first semi-circular block 121 and the second semi-circular block 122;

[0083] When the rotating plate 125 is in the non-blocking state, the telescopic plate 124 is in its original length state.

[0084] The telescopic plate 124 is provided to prevent some hydraulic oil from entering the cavity between the first semi-circular block 121 and the second semi-circular block 122 when the first semi-circular block 121 and the second semi-circular block 122 squeeze the annular liquid sac 13.

[0085] Embodiment III

[0086] In order to make the blocking state more stable, both ends of the rotating plate 125 are provided with arc-shaped structures, and arc-shaped card slots 123 are provided on the rectangular surfaces of the first semi-circular block 121 and the second semi-circular block 122; when the rotating plate 125 is in the blocking state, both ends of the rotating plate 125 are respectively clamped in the arc-shaped card slots 123.

[0087] In order to make the extraction and rotation of the extraction shaft 3 more easily stressed, the extraction shaft 3 further includes a force shaft 33. The lower end of the force shaft 33 is fixedly connected to the upper end of the shaft body 32, and the length of the shaft body 32 is greater than the distance between the upper end surface of the rotating plate 125 and the upper end surface of the cylinder 11; the through hole 18 is a rectangular hole, the clamping block 31 is a rectangular block, and the card slot 126 is a rectangular groove.

[0088] Embodiment IV

[0089] This embodiment provides a bottom sealing method for a new energy storage in depleted gas wells. The bottom sealing method includes:

[0090] After passing the clamping block 31 through the through hole 18, rotate the extraction shaft 3 to misalign the clamping block 31 with the through hole 18;

[0091] The clamping block 31 fits against the upper end face of the cylinder 11, and the sealing material is placed into the depleted gas well through the extraction shaft 3 and reaches the set position;

[0092] Lower the extraction shaft 3 and rotate the extraction shaft 3 to engage the clamping block 31 with the card slot 126;

[0093] Continue to rotate the extraction shaft 3, driving the rotating plate 125 to rotate, causing the first semi-circular block 121 and the second semi-circular block 122 to move outward and squeeze the annular liquid sac 13;

[0094] The hydraulic oil enters the liquid pipe 15 to drive the upper end of the support rod 14 to move outward, fitting the outer cylinder 2 against the wall of the depleted gas well;

[0095] Raise the extraction shaft 3. After the clamping block 31 disengages from the rotating plate 125, adjust the position of the extraction shaft 3 until the clamping block 31 is withdrawn from the through hole 18, and then remove the extraction shaft 3.

[0096] A method for removing the sealing material is also provided, and the method includes:

[0097] Insert the extraction shaft 3 into the depleted gas well, and then rotate the extraction shaft 3 to pass the clamping block 31 through the through hole 18 and into the cylinder 11;

[0098] Continue to rotate the extraction shaft 3 and lower the extraction shaft 3 to engage the clamping block 31 with the card slot 126;

[0099] Rotate the extraction shaft 3 so that the rotating plate 125 no longer exerts a force on the first semi-circular block 121 and the second semi-circular block 122;

[0100] Raise the extraction shaft 3 and ensure that the clamping block 31 is misaligned with the through hole 18;

[0101] Continue to raise the extraction shaft 3 to remove the extraction shaft 3 and the sealing material from the depleted gas well.

[0102] In the description of this specification, the descriptions referring to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0103] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0104] Those skilled in the art should understand that the above-described embodiments are only for clearly illustrating the present invention and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications can be made on the basis of the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A bottom-sealing device for a new energy storage in depleted gas wells, characterized in that, it includes: a bottom-sealing material and an extraction shaft (3). During use, the bottom-sealing material is placed in the depleted gas well, and the extraction shaft (3) is used to place the bottom-sealing material into the depleted gas well; the bottom-sealing material includes: an outer cylinder (2) and an internal support assembly (1). The internal support assembly (1) is arranged inside the outer cylinder (2), and the internal support assembly (1) is used to apply an outward force to the outer cylinder (2) and make the outer side surface of the outer cylinder (2) fit against the well wall of the depleted gas well. When the outer side surface of the outer cylinder (2) fits against the well wall of the depleted gas well, the upper part and the lower part of the outer cylinder (2) are not connected; the extraction shaft (3) includes: a shaft body (32) and a clamping block (31). The clamping block (31) is fixedly connected to the lower end of the shaft body (32), and the clamping block (31) is used to connect with the internal support assembly (1) and apply a force to the internal support assembly (1).

2. The bottom-sealing device for a new energy storage in depleted gas wells according to claim 1, characterized in that, the outer cylinder (2) includes: a flexible leather cup (21) and a sealing rubber ring (22). A plurality of the sealing rubber rings (22) are fixedly connected to the outer side surface of the flexible leather cup (21), and the sealing rubber rings (22) are coaxially arranged with the flexible leather cup (21).

3. The bottom-sealing device for a new energy storage in depleted gas wells according to claim 2, characterized in that, the internal support assembly (1) includes: a cylinder (11) whose upper end surface is provided with a through hole (18) adapted to the clamping block (31), and the diameter of the shaft body (32) is smaller than the width of the through hole (18); support rods (14). The lower ends of a plurality of the support rods (14) are rotatably connected to the lower part of the cylinder (11) through spherical rotary joints (16). The rotation plane of the support rods (14) is located in the diameter plane of the cylinder (11), and the upper ends of the support rods (14) are fixedly connected to the inner side surface of the flexible leather cup (21); a driving assembly which is arranged inside the cylinder (11), and the clamping block (31) passes through the through hole (18) to apply a force to the driving assembly; when it is necessary to seal the depleted gas well, the driving assembly applies a force to the support rods (14) to drive the upper ends of the support rods (14) to move away from the cylinder (11).

4. The bottom-sealing device for a new energy storage in depleted gas wells according to claim 3, characterized in that, the driving assembly includes: a power assembly (12) which is arranged inside the cylinder (11), and the lower part of the power assembly (12) is connected to the bottom surface of the cylinder (11); an annular liquid bag (13) which is arranged between the power assembly (12) and the inner side surface of the cylinder (11), and the annular liquid bag (13) is filled with hydraulic oil; A liquid pipe (15), the first end of which is communicated with the annular liquid bag (13), the second end of the liquid pipe (15) passes through the side wall of the cylinder (11) and the spherical rotary joint (16) and is arranged in the support rod (14), and both the first end and the second end of the liquid pipe (15) are arranged above the spherical rotary joint (16); The power assembly (12) applies a force to the annular liquid bag (13), and the hydraulic oil enters the liquid pipe (15) and drives the liquid pipe (15) to straighten.

5. A bottom sealing device for a new type of energy storage in depleted gas wells according to claim 4, characterized in that The drive assembly further includes: a return spring (17), the two ends of which are respectively connected to the cylinder (11) and the support rod (14), and the return spring (17) applies a force to the support rod (14) to drive the upper end of the support rod (14) to move towards the direction close to the cylinder (11).

6. A bottom sealing device for a new type of energy storage in depleted gas wells according to claim 4, characterized in that The power assembly (12) includes: A first semi-circular block (121) and a second semi-circular block (122), the central axes of the first semi-circular block (121) and the second semi-circular block (122) are both vertically arranged, the rectangular surface of the first semi-circular block (121) is parallel to the rectangular surface of the second semi-circular block (122), the lower end of the first semi-circular block (121) is slidably connected to the bottom surface of the cylinder (11) through a sliding device (127), the lower end of the second semi-circular block (122) is slidably connected to the bottom surface of the cylinder (11) through a sliding device (127), and the sliding directions of the first semi-circular block (121) and the second semi-circular block (122) are both perpendicular to their rectangular surfaces; A rotating plate (125), which is arranged between the first semi-circular block (121) and the second semi-circular block (122), and the rotating plate (125) is rotatably connected to the bottom surface of the cylinder (11) through a rotating device, the rotating axis of the rotating plate (125) is perpendicular to the bottom surface of the cylinder (11), and the upper end of the rotating plate (125) is provided with a card slot (126) adapted to the card block (31); The rotating plate (125) has two working states: A sealing state, the rotating plate (125) fits with the rectangular surfaces of the first semi-circular block (121) and the second semi-circular block (122), and applies an outward force to the first semi-circular block (121) and the second semi-circular block (122) to drive the first semi-circular block (121) and the second semi-circular block (122) to move outward; A non-sealing state, the rotating plate (125) is separated from the first semi-circular block (121) and the second semi-circular block (122), and the rotating plate (125) does not apply a force to the first semi-circular block (121) and the second semi-circular block (122).

7. A bottom sealing device for a new type of energy storage in depleted gas wells according to claim 6, characterized in that The power assembly (12) further includes a telescopic plate (124). The first telescopic edge of the telescopic plate (124) is fixedly connected to the first semi-circular block (121), and the second telescopic edge of the telescopic plate (124) is fixedly connected to the second semi-circular block (122). When the rotating plate (125) is in the blocking state, the telescopic plate (124) is in a state of elastic force, and the telescopic plate (124) applies an inward acting force to both the first semi-circular block (121) and the second semi-circular block (122). When the rotating plate (125) is in the non-blocking state, the telescopic plate (124) is in its original length state.

8. A bottom sealing device for a new type of energy storage in depleted gas wells according to claim 6, wherein, Both ends of the rotating plate (125) are provided with arc-shaped structures, and arc-shaped clamping grooves (123) are provided on the rectangular surfaces of the first semi-circular block (121) and the second semi-circular block (122). When the rotating plate (125) is in the blocking state, both ends of the rotating plate (125) are respectively clamped in the arc-shaped clamping grooves (123).

9. A bottom sealing device for a new type of energy storage in depleted gas wells according to claim 6, wherein, The extraction shaft (3) further includes a force shaft (33). The lower end of the force shaft (33) is fixedly connected to the upper end of the shaft body (32), and the length of the shaft body (32) is greater than the distance between the upper end surface of the rotating plate (125) and the upper end surface of the cylinder (11). The through hole (18) is a rectangular hole, the clamping block (31) is a rectangular block, and the clamping groove (126) is a rectangular groove.

10. A bottom sealing method for a new type of energy storage in depleted gas wells, wherein, Based on a bottom sealing device for a new type of energy storage in depleted gas wells according to any one of claims 6-9, the bottom sealing method includes: After passing the clamping block (31) through the through hole (18), rotate the extraction shaft (3) so that the clamping block (31) is arranged in a dislocation manner with respect to the through hole (18). The clamping block (31) is attached to the upper end surface of the cylinder (11), and the bottom sealing material is put into the depleted gas well through the extraction shaft (3) and reaches the set position. Lower the extraction shaft (3), and rotate the extraction shaft (3) so that the clamping block (31) is engaged with the clamping groove (126). Continue to rotate the extraction shaft (3), drive the rotating plate (125) to rotate so that the first semi-circular block (121) and the second semi-circular block (122) move outward to squeeze the annular liquid sac (13). The hydraulic oil enters the liquid pipe (15) to drive the upper end of the support rod (14) to move outward so that the outer cylinder (2) is attached to the wall surface of the depleted gas well. Lift the extraction shaft (3), after the clamping block (31) is disengaged from the rotating plate (125), adjust the position of the extraction shaft (3) until the clamping block (31) is withdrawn from the through hole (18), and remove the extraction shaft (3).

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