Temporary plugging device for production casing of compressed air energy storage well

Abstract

The invention relates to the field of injection and production of air energy storage wells, in particular to a temporary plugging device for a production casing of a compressed air energy storage well, and aims to solve the technical problem that an injection and production pipe column cannot be effectively replaced in the prior art. The device comprises a central pipe, and the central pipe is sequentially sleeved with a setting mechanism, a driving mechanism and a setting and hanging mechanism. The setting mechanism comprises a leather cup cover and a leather cup, the leather cup is sleeved with the leather cup cover, and the leather cup is fixed to the center pipe; the seat hanging mechanism comprises a slip and a supporting rod, one end of the slip is hinged to the center pipe, the supporting rod is provided with a first end and a second end, the first end is hinged to the slip, and the second end is in sliding fit with the center pipe and can rotate around the hinge axis of the first end. And the driving mechanism is in transmission connection with the leather cup cover and the second end. After the device penetrates through an injection and production pipe column, a production sleeve is sealed through the pressing and setting mechanism, and the device is anchored to the production sleeve through the setting and hanging mechanism, so that air pressure in an underground salt cavern cavity can be effectively sealed and isolated, and subsequent replacement of the injection and production pipe column is facilitated.

Description

Technical Field

[0001] The invention relates to the field of air energy storage well injection and production, and in particular to a temporary plugging device for a production casing of a compressed air energy storage well. Background Art

[0002] Compressed air energy storage refers to a storage method that uses electrical energy to compress air during the low load period of the power grid, seals the air at high pressure in energy storage reservoirs such as underground salt caverns, and releases the compressed air during the peak load period of the power grid to drive the steam turbine to generate electricity.

[0003] In order to meet the needs of large-volume air injection and production, the current maximum production casing of underground salt cavern energy storage wells is 185 / 8 in, and the corresponding injection and production string is 133 / 8 in. In long-term injection and production operations, the injection and production string needs to be replaced after corrosion or other problems occur. However, since the underground salt cavern cavity is too large and filled with compressed air, it cannot be replaced by injecting a well-killing hydraulic well like conventional oil and gas wells. Summary of the invention

[0004] The purpose of the present invention is to provide a compressed air energy storage well production casing temporary plugging device to solve the technical problem that the injection and production pipe string cannot be effectively replaced in the related art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: The compressed air energy storage well production casing temporary plugging device provided by the present invention comprises: a central pipe, along the axial direction of the central pipe, the central pipe is sequentially sleeved with a sealing mechanism, a driving mechanism and a seating mechanism; The setting mechanism comprises a leather cup cover and a leather cup, wherein the leather cup cover is sleeved on the leather cup, the leather cup is fixed to the center tube and presents a pleated structure inside the leather cup cover; The sitting and hanging mechanism comprises a slip and a support rod, wherein one end of the slip away from the driving mechanism is hinged to the central tube, and the support rod has a first end and a second end in opposite directions, the first end is hinged to the slip, and the second end is slidably matched with the central tube and can also rotate around the hinge axis of the first end; The driving mechanism is in transmission connection with both the leather cup cover and the second end, and is configured to drive both the leather cup cover and the second end to move toward the slip under a pressing condition.

[0006] Further, the driving mechanism includes a piston cylinder and a setting piston, wherein the piston cylinder is fixedly connected to the center tube, the setting piston is located between the outer wall of the center tube and the inner wall of the piston cylinder, and is surrounded by the outer wall of the center tube and the inner wall of the piston cylinder to form a first annular cavity, and one end of the setting piston is in contact with the piston cylinder, and the other end is used to drive the second end to move; A first pressure transmission hole is provided on the side wall of the central tube, and the first pressure transmission hole is connected to the first annular cavity; The leather cup cover is fixedly connected to the setting piston.

[0007] Furthermore, the hanging mechanism further comprises a locking ring, which is sleeved on the central tube and matched with the central tube via a horse tooth buckle structure; The other end of the setting piston is in contact with the locking ring, and the second end is hinged to the locking ring.

[0008] Furthermore, the hanging mechanism further comprises a locking sleeve, the locking sleeve is fixedly connected to the central tube, and a first inverted tooth is provided on the outer wall of the locking sleeve; The inner wall of the locking ring is provided with a second inverted tooth, and the second inverted tooth is engaged with the first inverted tooth to form the horse tooth buckle structure.

[0009] Further, the locking sleeve includes an integrally formed fixing sleeve and a plurality of elastic claws, wherein the fixing sleeve and the setting piston are spaced apart and are threadedly connected to the center tube, and the plurality of elastic claws are spaced apart and evenly distributed along the circumference of the fixing sleeve and have gaps with the outer wall of the center tube; The first inverted tooth is formed on the elastic claw; The side wall of the central tube is provided with a sliding groove extending along its own axial direction; The compressed air energy storage well production casing temporary plugging device also includes a salvage mechanism, which includes a salvage tube and a lifting bolt; The overshot is located in the central tube and is connected to the central tube via unsealing shear pins; The lifting bolt corresponds to the elastic claw one by one, and one end of the lifting bolt is fixed in the side wall of the salvage tube, and the other end passes through the sliding groove and contacts the inner wall of the elastic claw. In the axial direction of the center tube, the lifting bolt is outside the center tube and the side opposite to the fixed tube is opposite to the inner wall of the setting piston.

[0010] Furthermore, a plurality of lifting hooks are fixedly connected to the setting piston, and the plurality of lifting hooks are spaced and evenly distributed along the circumference of the setting piston, and the hooking portions thereof extend in a direction away from the setting piston and pass over the locking ring.

[0011] Furthermore, the salvage mechanism also includes a salvage claw, which is located in the central tube, has a gap between the salvage claw and the inner wall of the central tube, and is fixedly connected to the salvage tube.

[0012] Furthermore, the compressed air energy storage well production casing temporary plugging device also includes an upper joint, which is inserted into the central pipe and connected to the central pipe through a shear nail; The driving mechanism further includes a release piston, which is located between the outer wall of the central tube and the inner wall of the piston cylinder, and is surrounded by the outer wall of the central tube and the inner wall of the piston cylinder to form a second annular cavity; In the axial direction of the central tube, the release piston is axially fixed between the release shear pin and the inner wall of the piston cylinder; A second pressure transmission hole is also provided on the side wall of the central tube, and the second pressure transmission hole is communicated with the second annular cavity.

[0013] Furthermore, a retaining ring is threadedly connected to the outer wall of the central tube, and the retaining ring is spaced apart from the release shear pins to prevent the release piston from separating from the central tube.

[0014] Furthermore, the setting mechanism further comprises a leather cup shaft, the leather cup shaft is sleeved on the piston cylinder and fixedly connected to the piston cylinder; The leather cup is sleeved on the leather cup shaft and is fixedly connected with the leather cup shaft through vulcanization.

[0015] In summary of the above technical solutions, the technical effects that can be achieved by the temporary plugging device for production casing of compressed air energy storage wells provided by the present invention are: In the compressed air energy storage well production casing temporary plugging device, the leather cup cover compresses the leather cup to limit the radial expansion of the leather cup. The leather cup has a pleated structure in the compressed state. After the restriction is released, the leather cup will naturally unfold and expand radially; the cava is hinged to the center pipe and the support rod respectively, and shrinks to the center pipe in the natural state. When the second end moves toward the cava, the first end will drive the cava to rotate outward around the hinge axis of the cava and the center pipe, causing the cava to expand outward.

[0016] During specific application, pressure is applied to the device to activate the driving mechanism, driving the leather cup cover and the second end to move toward the slip at the same time; the movement of the leather cup cover releases the restriction on the leather cup, and the leather cup expands and fits against the inner wall of the production casing to play a sealing role; the movement of the second end pushes the slip to expand outward, causing the slip to bite into the inner wall of the production casing to play an anchoring role.

[0017] It can be seen that by using the compressed air energy storage well production casing temporary plugging device, after passing through the injection and production string, the sealing mechanism will seal the production casing through pressure, and the hanging mechanism will anchor the device to the production casing. In this way, the air pressure in the underground salt cavern cavity can be effectively sealed, thereby facilitating the subsequent replacement of the 133 / 8in injection and production string, and also reducing the operational risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a temporary plugging device for a compressed air energy storage well production casing provided by an embodiment of the present invention; Figure 2 A front view of a temporary plugging device for production casing of a compressed air energy storage well provided in an embodiment of the present invention; Figure 3 for Figure 2 Section view in the AA direction; Figure 4 for Figure 3 An enlarged view of point I.

[0020] Icon: 1-center tube; 101-first pressure transmission hole; 102-sliding groove; 103-second pressure transmission hole; 2-leather cup cover; 3-leather cup; 4-slip; 5-support rod; 6-piston cylinder; 7-setting piston; 701-piston body; 702-push cylinder; 8-first ring cavity; 9-locking ring; 10-locking sleeve; 11-fishing tube; 12-lifting bolt; 13-unsealing shear pin; 14-lifting hook; 15-fishing claw; 16-upper joint; 17-release shear pin; 18-release piston; 19-second ring cavity; 20-retaining ring; 21-leather cup shaft; 22-lower joint; 23-fixing ring; 24-release shear ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0024] During long-term injection and production operations, the injection and production tubing needs to be replaced when corrosion or other problems occur. However, since the underground salt cavern cavity is too large and filled with compressed air, it cannot be replaced by injecting a well-killing hydraulic well like conventional oil and gas wells.

[0025] In view of this, the present invention provides a temporary plugging device for production casing of a compressed air energy storage well, comprising a center tube, along the axial direction of the center tube, a sealing mechanism, a driving mechanism and a hanging mechanism are sequentially sleeved on the center tube; the sealing mechanism comprises a leather cup cover 2 and a leather cup 3, wherein the leather cup cover 2 is sleeved on the leather cup 3, the leather cup 3 is fixed to the center tube, and presents a pleated structure inside the leather cup cover 2; the hanging mechanism comprises a cava 4 and a support rod 5, wherein the cava 4 is hinged to the center tube at one end away from the driving mechanism, and the support rod 5 has a first end and a second end in opposite directions, the first end is hinged to the cava 4, and the second end is slidably matched with the center tube, and can also rotate around the hinge axis of the first end; the driving mechanism is transmission-connected to both the leather cup cover 2 and the second end, and is configured to drive the leather cup cover 2 and the second end to move toward the cava 4 under pressure conditions.

[0026] In the compressed air energy storage well production casing temporary plugging device, the leather cup cover 2 compresses the leather cup 3 to limit the radial expansion of the leather cup 3. The leather cup 3 is in a pleated structure in the compressed state. After the restriction is released, the leather cup 3 will naturally unfold and expand radially; the cava 4 is hinged to the center pipe and the support rod 5 respectively, and shrinks to the center pipe in the natural state. When the second end moves toward the cava 4, the first end will drive the cava 4 to rotate outward around the hinge axis of the cava 4 and the center pipe, so that the cava 4 expands outward.

[0027] During specific application, pressure is applied to the device to activate the driving mechanism, driving the leather cup cover 2 and the second end to move toward the slip 4 at the same time; the movement of the leather cup cover 2 releases the restriction on the leather cup 3, and the leather cup 3 expands and fits against the inner wall of the production casing to play a sealing role; the movement of the second end pushes the slip 4 to expand outward, so that the slip 4 bites into the inner wall of the production casing to play an anchoring role.

[0028] It can be seen that by using the compressed air energy storage well production casing temporary plugging device, after passing through the injection and production string, the sealing mechanism will seal the production casing through pressure, and the hanging mechanism will anchor the device to the production casing. In this way, the air pressure in the underground salt cavern cavity can be effectively sealed, thereby facilitating the subsequent replacement of the 133 / 8in injection and production string, and also reducing the operational risks.

[0029] The following combination Figures 1 to 4 The structure and shape of the temporary plugging device for the production casing of the compressed air energy storage well provided in this embodiment are described in detail: Regarding the drive mechanism, specifically: refer to Figures 1 to 4 The driving mechanism includes a piston cylinder 6 and a sealing piston 7; the piston cylinder 6 is threadedly connected to the center tube; the sealing piston 7 consists of a piston body 701 and a push cylinder 702, wherein the piston body 701 is located between the outer wall of the center tube and the inner wall of the piston cylinder 6, and is surrounded by the outer wall of the center tube and the inner wall of the piston cylinder 6 to form a first annular cavity 8, the upper end of which contacts the inner step of the piston cylinder 6, and the lower end contacts the upper end of the push cylinder 702, the lower end of the push cylinder 702 passes through the piston cylinder 6, and is used to drive the second end to move; a first pressure transmission hole 101 is provided on the side wall of the center tube, and the first pressure transmission hole 101 is connected to the first annular cavity 8; the leather cup cover 2 is sleeved on the piston cylinder 6, and the lower end of which is threadedly connected to the push cylinder 702.

[0030] When pressure is applied to the center tube, hydraulic pressure enters the first annular cavity 8 from the first pressure transmission hole 101, exerting a downward thrust on the piston body 701, causing the piston body 701 and the push cylinder 702 to move downward synchronously; during the downward movement of the push cylinder 702, the second end is driven to slide downward, causing the support rod 5 to support the cava 4 outward to achieve expansion, and also driving the leather cup cover 2 to move downward, releasing the restriction on the leather cup 3, so that the leather cup 3 in the compressed state naturally unfolds and expands radially.

[0031] For further reference, Figure 3 and Figure 4 The compressed air energy storage well production casing temporary plugging device also includes an upper joint 16 and a hand-release shear ring 24; the lower end of the upper joint 16 is inserted into the center pipe from the upper end of the center pipe, and the upper joint 16 is connected to the center pipe through a hand-release shear nail 17; the hand-release shear ring 24 is sleeved with the center pipe and connected to the center pipe through the hand-release shear nail 17. Figure 4 As shown, the driving mechanism also includes a release piston 18, which is located between the outer wall of the center tube and the inner wall of the piston cylinder 6, and is surrounded by the outer wall of the center tube and the inner wall of the piston cylinder 6 to form a second annular cavity 19, the upper end of which is in contact with the release shear ring 24, and the lower end is in contact with the inner step of the piston cylinder 6; a second pressure transmission hole 103 is also provided on the side wall of the center tube, and the second pressure transmission hole 103 is connected to the second annular cavity 19.

[0032] In the above design, the upper joint 16 is used to connect with the continuous oil pipe, and the compressed air energy storage well production casing temporary plugging device is lowered into the underground salt cavern energy storage well through the continuous oil pipe; after the sealing and hanging are completed, the pressure continues to increase, and the hydraulic pressure entering the second annular cavity 19 from the second pressure transmission hole 103 acts on the release piston 18, so that the release piston 18 has a tendency to slide upward; after the hydraulic pressure value reaches the shear value of the release shear pin 17, the release shear pin 17 is sheared, and at this time, the upper joint 16 and the continuous oil pipe can be lifted out of the wellbore to complete the release.

[0033] In addition, it is necessary to add that Figure 3As shown, a retaining ring 20 is threadedly connected to the outer wall of the central tube, and the retaining ring 20 is located above the release shear ring 24. After the release shear nail 17 is cut off, under the action of the hydraulic pressure, the release piston 18 pushes the release shear ring 24 to slide upward until the release shear ring 24 abuts against the retaining ring 20. With this design, after the release, the release shear ring 24 and the release piston 18 are prevented from falling into the underground salt cavern cavity due to separation from the central tube.

[0034] In this embodiment, reference Figure 3 The sealing mechanism also includes a leather cup shaft 21, which is sleeved on the piston cylinder 6 and threadedly connected to the piston cylinder 6; the leather cup 3 is sleeved on the leather cup shaft 21 and fixedly connected to the leather cup shaft 21 by vulcanization.

[0035] Regarding the sitting and hanging mechanism, specifically: refer to Figures 1 to 3 , a fixing ring 23 is provided on the outer sleeve of the center tube, and the lower joint 22 is threadedly connected to the bottom end of the center tube and cooperates with the step on the center tube to fix the fixing ring 23 to the center tube; the slip 4 is in a "<" shape, and its included angle is an obtuse angle. Its lower end is hinged to the fixing ring 23 through a first rotating shaft, and its corner is hinged to the bottom end of the support rod 5 through a second rotating shaft. The hanging mechanism also includes a locking sleeve 10 and a locking ring 9; the locking sleeve 10 is sleeved on the center tube and threadedly connected to the center tube, and a first inverted tooth is provided on its outer wall; the locking ring 9 is sleeved on the locking sleeve 10, and is located above the slip 4 and contacts with the bottom end of the push tube 702. The locking ring 9 is hinged to the top end of the support rod 5 through a third rotating shaft, and a second inverted tooth is provided on its inner wall. The second inverted tooth is engaged with the first inverted tooth to form a horse tooth buckle structure.

[0036] When applying, refer to Figure 3 Under the action of liquid pressure, the piston body 701 moves downward, and driven by the push cylinder 702, the locking ring 9 slides downward, so that the support rod 5 supports the slip 4 outward, and the slip 4 bites into the inner wall of the production casing for anchoring. At the same time, the leather cup cover 2 also moves downward, and the leather cup 3 naturally unfolds and fits into the inner wall of the production casing for sealing; during the downward movement of the locking ring 9, the first inverted tooth bites with the second inverted tooth to prevent the locking ring 9 from moving upward, thereby ensuring the stability of the slip 4 sitting and the sealing of the leather cup 3.

[0037] After the replacement of the injection and production string is completed, in order to facilitate the salvage of the compressed air energy storage well production casing temporary plugging device, refer to Figure 3 The device also includes a salvaging mechanism. In this example, the locking sleeve 10 includes an integrally formed fixing tube and a plurality of elastic claws, wherein the fixing tube is located below the locking ring 9 and is threadedly connected to the center tube, the plurality of elastic claws are spaced and evenly distributed along the circumference of the fixing tube, and have a gap between them and the outer wall of the center tube, and the upper ends thereof extend between the inner wall of the push tube 702 and the outer wall of the center tube; the first inverted teeth are formed on the elastic claws.

[0038] In continuation of the above, a sliding groove 102 extending along the axial direction of the central tube is provided on the side wall thereof; the salvage mechanism comprises a salvage tube 11, a lifting bolt 12 and a salvage claw 15; the salvage tube 11 is located in the central tube and is connected to the central tube by an unsealing shear nail 13; the lifting bolt 12 corresponds to the elastic claw one by one, and one end thereof is threadedly connected to the side wall of the salvage tube 11, and the other end thereof passes through the sliding groove 102 and abuts against the inner wall of the elastic claw. In the axial direction of the central tube, the lifting bolt 12 is located outside the central tube and the side opposite to the fixed tube is directly opposite to the inner wall of the push tube 702; the salvage claw 15 is located in the central tube and is threadedly connected to the salvage tube 11, and the salvage claw is located above the salvage tube 11 and there is a gap between the inner wall of the central tube.

[0039] Continuing with the above, the outer wall of the elastic claw near its own top end protrudes to form a first protrusion, and the inner wall of the push tube 702 near its own bottom end protrudes to form a second protrusion, and the second protrusion cooperates with the first protrusion to form an inclined wedge structure. The push tube 702 is fixedly connected with a plurality of lifting hooks 14, which are spaced and evenly distributed along the circumference of the setting piston 7, and the lifting hooks 14 are "L" shaped, and the hooking portion thereof, i.e., a shorter section extending along the radial direction of the central tube, passes over the locking ring 9 and is located below the locking ring 9.

[0040] When salvaging, refer to Figure 3 The coiled tubing is connected to the salvage tool, which is lowered into the salvage claw 15 and cooperates with the inner step on the upper part of the salvage claw 15 to lift the salvage tool, and the salvage claw 15 applies an upward pulling force to the salvage tube 11; after the pulling force reaches the shearing value of the unsealing shear nail 13, the salvage tube 11 drives the lifting bolt 12 upward to release the support for the elastic claw, and when the lifting bolt 12 moves upward to the inner step of the push tube 702, it drives the push tube 702 to move upward synchronously.

[0041] As mentioned above, during the upward movement of the push cylinder 702, the leather cup cover 2 is driven upward, and the leather cup cover 2 squeezes the leather cup 3, causing the leather cup 3 to shrink and be unsealed; at the same time, the inclined surface of the second protrusion squeezes the inclined surface of the first protrusion, causing the elastic claw to shrink, so that the lock between the locking ring 9 and the locking sleeve 10 is released; the lifting hook 14 also moves upward synchronously, and when passing through the locking ring 9, it pulls the locking ring 9 to slide upward, causing the support rod 5 to drive the slip 4 to shrink and release the anchor, and then the device is lifted out of the wellhead along with the continuous oil pipe.

[0042] The working process of the compressed air energy storage well production casing temporary plugging device provided in this embodiment is as follows: refer to Figure 3 The upper end of the upper joint 16 is connected to the coiled tubing, and the coiled tubing drives the device to pass through the 133 / 8in injection and production string. After reaching the preset position, the coiled tubing is pressurized. It should be noted here that the pressure operation is a conventional technical means. For example, a ball is first dropped to hold the pressure, that is, a ball is dropped into the center pipe, and after the ball is sealed in the overshot tube 11, the pressure is continued.

[0043] In connection with the above, since the salvage tube 11 is blocked by the ball, the hydraulic pressure will enter the second annular cavity 19 from the second pressure transmission hole 103, and enter the first annular cavity 8 from the first pressure transmission hole 101. The hydraulic pressure in the second annular cavity 19 applies an upward thrust to the release piston 18, and the hydraulic pressure in the first annular cavity 8 applies a downward thrust to the piston body 701, so that the piston body 701 and the push tube 702 move downward synchronously; during the downward movement of the push tube 702, the locking ring 9 slides downward synchronously, so that the support rod 5 supports the cava 4 outward, and the cava 4 bites into the inner wall of the production casing for anchoring, and at the same time, the leather cup cover 2 also moves downward, and the leather cup 3 naturally unfolds and fits into the inner wall of the production casing for sealing; during the downward movement of the locking ring 9, the first inverted tooth bites with the second inverted tooth to prevent the locking ring 9 from retreating, thereby ensuring the stability of the cava 4 sitting and the leather cup 3 sealing.

[0044] Then, the pressure is increased continuously. When the hydraulic pressure reaches the shearing value of the release shear pin 17, the release shear pin 17 is sheared. At this time, the upper joint 16 and the coiled tubing can be lifted out of the wellbore to complete the release.

[0045] Continuing with the above, after the operation is completed, the continuous tubing is connected to the salvage tool, so that the salvage tool is lowered into the inside of the salvage claw 15 and cooperates with the inner step on the upper part of the salvage claw 15, and then the salvage tool is lifted up to drive the salvage tube 11 upward to cut the unsealing shear nail 13; during the upward movement of the salvage tube 11, the lifting bolt 12 is driven upward to release the support for the elastic claw, and when the lifting bolt 12 moves up to the inner step of the push tube 702, the push tube 702 is driven upward; during the upward movement of the push tube 702, the leather cup cover 2 is driven upward, and the leather cup cover 2 squeezes the leather cup 3, so that the leather cup 3 shrinks and is unsealed; at the same time, the inclined surface of the second protrusion squeezes the inclined surface of the first protrusion to shrink the elastic claw, so that the lock between the locking ring 9 and the locking sleeve 10 is released; the lifting hook 14 also moves upward synchronously, and when passing through the locking ring 9, it pulls the locking ring 9 to slide upward, so that the support rod 5 drives the slip 4 to shrink and release the anchor, and then the device is lifted out of the wellhead along with the continuous tubing.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A temporary plugging device for production casing of compressed air energy storage well, characterized in that: include: A central tube (1), wherein a sealing mechanism, a driving mechanism and a seating mechanism are sequentially sleeved on the central tube (1) along the axial direction of the central tube (1); The setting mechanism comprises a leather cup cover (2) and a leather cup (3), wherein the leather cup cover (2) is sleeved on the leather cup (3), and the leather cup (3) is fixed to the central tube (1) and presents a folded structure inside the leather cup cover (2); The sitting and hanging mechanism comprises a slip (4) and a support rod (5), wherein one end of the slip (4) away from the driving mechanism is hinged to the central tube (1), and the support rod (5) has a first end and a second end in opposite directions, the first end is hinged to the slip (4), and the second end is slidably matched with the central tube (1) and can also rotate around the hinge axis of the first end; The driving mechanism is in transmission connection with the leather cup cover (2) and the second end, and is configured to drive the leather cup cover (2) and the second end to move toward the slip (4) under a pressing condition.

2. The compressed air energy storage well production casing temporary plugging device according to claim 1 is characterized in that: The driving mechanism comprises a piston cylinder (6) and a setting piston (7), wherein the piston cylinder (6) is fixedly connected to the center tube (1), the setting piston (7) is located between the outer wall of the center tube (1) and the inner wall of the piston cylinder (6), and is enclosed with the outer wall of the center tube (1) and the inner wall of the piston cylinder (6) to form a first annular cavity (8), and one end of the setting piston (7) is in contact with the piston cylinder (6), and the other end is used to drive the second end to move; A first pressure transmission hole (101) is provided on the side wall of the central tube (1), and the first pressure transmission hole (101) is connected to the first annular cavity (8); The leather cup cover (2) is fixedly connected to the setting piston (7).

3. The compressed air energy storage well production casing temporary plugging device according to claim 2 is characterized in that: The hanging mechanism further comprises a locking ring (9), wherein the locking ring (9) is sleeved on the central tube (1) and cooperates with the central tube (1) via a tooth-shaped buckle structure; The other end of the setting piston (7) is in contact with the locking ring (9), and the second end is hinged to the locking ring (9).

4. The compressed air energy storage well production casing temporary plugging device according to claim 3 is characterized in that: The mounting mechanism further comprises a locking sleeve (10), wherein the locking sleeve (10) is fixedly connected to the central tube (1) and has a first inverted tooth on its outer wall; The inner wall of the locking ring (9) is provided with a second inverted tooth, the second inverted tooth meshes with the first inverted tooth and forms the horse tooth buckle structure.

5. The compressed air energy storage well production casing temporary plugging device according to claim 4 is characterized in that: The locking sleeve (10) comprises an integrally formed fixing sleeve and a plurality of elastic claws, wherein the fixing sleeve and the setting piston (7) are spaced apart and threadedly connected to the center tube (1), and the plurality of elastic claws are spaced apart and evenly distributed along the circumference of the fixing sleeve and have gaps between them and the outer wall of the center tube (1); The first inverted tooth is formed on the elastic claw; The side wall of the central tube (1) is provided with a sliding groove (102) extending along its own axial direction; The compressed air energy storage well production casing temporary plugging device also includes a salvage mechanism, which includes a salvage tube (11) and a lifting bolt (12); The overshot tube (11) is located inside the central tube (1) and is connected to the central tube (1) via an unsealing shear pin (13); The lifting bolt (12) corresponds to the elastic claw one by one, and one end of the lifting bolt (12) is fixed in the side wall of the salvage tube (11), and the other end passes through the sliding groove (102) and contacts the inner wall of the elastic claw. In the axial direction of the center tube (1), the lifting bolt (12) is outside the center tube (1) and the side opposite to the fixing tube is opposite to the inner wall of the setting piston (7).

6. The compressed air energy storage well production casing temporary plugging device according to claim 5, characterized in that: A plurality of lifting hooks (14) are fixedly connected to the setting piston (7), and the plurality of lifting hooks (14) are spaced and evenly distributed along the circumference of the setting piston (7), and their hooking portions extend in a direction away from the setting piston (7) and pass over the locking ring (9).

7. The compressed air energy storage well production casing temporary plugging device according to claim 5, characterized in that: The salvaging mechanism further comprises a salvaging claw (15), which is located in the central tube (1) and has a gap with the inner wall of the central tube (1), and is fixedly connected to the salvaging tube (11).

8. The compressed air energy storage well production casing temporary plugging device according to claim 2, characterized in that: The compressed air energy storage well production casing temporary plugging device also includes an upper joint (16), the upper joint (16) is inserted into the central pipe (1), and is connected to the central pipe (1) via a shear nail (17); The driving mechanism further comprises a release piston (18), wherein the release piston (18) is located between the outer wall of the central tube (1) and the inner wall of the piston cylinder (6), and is enclosed with the outer wall of the central tube (1) and the inner wall of the piston cylinder (6) to form a second annular cavity (19); In the axial direction of the central tube (1), the release piston (18) is axially fixed between the release shear pin (17) and the inner wall of the piston cylinder (6); A second pressure transmission hole (103) is also provided on the side wall of the central tube (1), and the second pressure transmission hole (103) is connected to the second annular cavity (19).

9. The compressed air energy storage well production casing temporary plugging device according to claim 8, characterized in that: A retaining ring (20) is threadedly connected to the outer wall of the central tube (1), and the retaining ring (20) is spaced apart from the release shear pin (17) and is used to prevent the release piston (18) from detaching from the central tube (1).

10. The compressed air energy storage well production casing temporary plugging device according to claim 2, characterized in that: The setting mechanism further comprises a leather cup shaft (21), wherein the leather cup shaft (21) is sleeved on the piston cylinder (6) and fixedly connected to the piston cylinder (6); The leather cup (3) is sleeved on the leather cup shaft (21) and is fixedly connected to the leather cup shaft (21) by vulcanization.

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