A quick-sealing and recyclable bridge plug based on a four-bar linkage supporting a rubber setting ring.

Abstract

This invention discloses a rapid-sealing and retrievable bridge plug based on a four-bar linkage supporting a rubber setting ring. It includes: a top pressure cylinder; a central cylinder positioned directly below the top pressure cylinder; a locking and releasing assembly positioned at the upper end of the central cylinder for locking or releasing the top pressure cylinder and the central cylinder; a setting assembly positioned in the upper middle part of the central cylinder for forming a sealing support with the inner wall of the sleeve; a hydraulic blocking assembly positioned inside the central cylinder for cooperating with the ball to block and conduct pressurized fluid, thereby driving the setting assembly to set and release; and a retrieval shaft inserted during release, cooperating with the hydraulic blocking assembly to lift the ball and retrieve the hydraulic blocking assembly, the central cylinder, the setting assembly, and the locking and releasing assembly. The beneficial effects of this invention are: it is controlled by hydraulic pressure and tension, enabling rapid sealing, rapid release, and retrieval.

Description

Technical Field

[0001] This invention relates to the field of downhole tools for oil and gas fields, and in particular to a retrievable bridge plug that can be quickly sealed based on a four-bar linkage supporting a rubber setting ring. Background Technology

[0002] A bridge plug is an important tool for sealing oil layers inside a casing. Its main component is a rubber sleeve. Through hydraulic or mechanical action, the rubber sleeve expands to seal the annular space between the tubing and the casing, separating the upper and lower oil layers to achieve the construction purpose. This is the main function of a bridge plug. There are many types of bridge plugs, which can be divided into two types according to their removal method: removable bridge plugs and permanent bridge plugs.

[0003] In the process of oil exploration and development, sealing is an extremely critical operation. Operations such as layered oil testing, layered fracturing and acidizing, layered sand control, layered water injection, layered production, as well as sealing water layers, dry layers and abandoned layers, all rely on sealing technology. Bridge plugs are an important tool for realizing the sealing process, and their performance directly affects the operation results.

[0004] Currently, many retrievable bridge plug structures are used in the field. After the bridge plug isolates the lower oil and gas layer for a period of time, a trap pressure will exist at the bottom of the bridge plug. When it is necessary to untangle the bridge plug, the trap pressure at the bottom of the bridge plug cannot be released. This can cause the trap pressure to push up the untangling string during the bridge plug retrieval process, leading to a safety accident. Traditional cementing sealing methods have obvious drawbacks. They cannot be used in overflow wells, lost circulation wells, or when the interlayer thickness is small. Furthermore, when backfilling is required, the cement plug must be drilled out to restore the connection between the upper and lower layers, which undoubtedly increases the difficulty and cost of the operation. Although mechanical sealing has the advantages of small tool structure and fast construction speed, the bridge plugs used have low pressure differential resistance, making milling difficult during backfilling and failing to meet the requirements of high-pressure construction. This also hinders subsequent construction to some extent and increases production costs.

[0005] As oil and gas exploration progresses to deeper levels, the number of deep wells, ultra-deep wells, gas wells, and other special high-pressure wells continues to rise. The shortcomings of traditional sealing tools in terms of pressure resistance, temperature resistance, sealing performance, and recyclability are becoming increasingly apparent, making them unable to adapt to the increasingly complex downhole operating environment and ever-increasing production requirements. Therefore, developing high-performance recyclable bridge plugs has become an urgent need to resolve current production contradictions and promote the efficient development of the petroleum industry. Summary of the Invention

[0006] The purpose of this invention is to provide a recyclable bridge plug that is quickly sealed by a rubber seat ring supported by a four-bar linkage. It is controlled by hydraulic pressure and tension, and can quickly seal, unseal, and recycle the plug.

[0007] To achieve the above objectives, the present invention adopts the following technical solution, including: Top pressure cylinder; The center cylinder is located directly below the top pressure cylinder; A locking and releasing assembly is provided at the upper end of the central cylinder to lock or release the top pressure cylinder from the central cylinder; A setting assembly, which is disposed in the upper middle part of the central cylinder, is used to form a sealing support with the inner wall of the sleeve; A hydraulic blocking component, which is disposed inside the central cylinder, is used to cooperate with the ball to block and conduct the pressurized fluid, thereby driving the setting component to set and release. A recovery shaft is used to be lowered during unsealing and cooperates with the hydraulic blocking assembly to lift the ball and recover the hydraulic blocking assembly, the center cylinder, the setting assembly, and the locking and releasing assembly; The locking and releasing component includes: The first step is located on the outer periphery of the middle part of the top pressure cylinder; A keyway is provided parallel to the axial direction on the lower outer periphery of the top pressure cylinder; A locking sleeve is disposed on the lower outer periphery of the top pressure cylinder; the upper end of the locking sleeve abuts against the first step; a first periphery extending inward is provided on the lower part of the locking sleeve; the inner periphery of the first periphery is adapted to the lower outer periphery of the top pressure cylinder; An outer cylinder is disposed on the outer periphery of the locking sleeve; the upper inner periphery of the outer cylinder is adapted to the outer periphery of the locking sleeve; the upper end of the outer cylinder abuts against the first step; a second periphery extending inward is provided on the middle inner periphery of the outer cylinder; a pair of arc-shaped grooves are symmetrically arranged through the second periphery; the second periphery abuts against the lower ends of the locking sleeve and the top pressure cylinder; A first arc-shaped insert and a second arc-shaped insert are vertically disposed at the upper end of the central cylinder. The first and second arc-shaped inserts pass through corresponding arc-shaped grooves and are inserted between the lower part of the top pressure cylinder and the first periphery. The inner periphery of the first and second arc-shaped inserts is adapted to the outer periphery of the lower part of the top pressure cylinder. The outer periphery of the first and second arc-shaped inserts is adapted to the inner periphery of the first periphery. A through locking key mounting groove is provided on the first arc-shaped insert. A locking key is disposed within the locking key mounting groove; the width of the locking key is adapted to the width of the keyway, and the length of the locking key is less than the length of the keyway; the inner circumference of the locking key is adapted to the bottom wall of the keyway; the outer circumference of the locking key is adapted to the inner circumference of the first periphery; the locking key is used to limit the axial position and rotation state of the top pressure cylinder, thereby realizing the locking or release of the top pressure cylinder and the central cylinder.

[0008] Preferably, the upper and lower ends of the keyway and the upper and lower ends of the locking key are respectively provided with matching chamfer structures, and the angle of the chamfer structure is 25°-35°.

[0009] Preferably, the setting assembly includes: A hexagonal clamp is fitted into the middle of the central cylinder and connected to the central cylinder by a second shear pin; beams are provided at the center of the six sides of the hexagonal clamp, which are arranged parallel to the axial direction, and the upper and lower ends of the beams extend out of the sides respectively; The upper rubber tube fixing platform and the lower rubber tube fixing platform are respectively fitted onto the upper part and the middle part of the central cylinder, and are symmetrically arranged relative to the hexagonal clamping platform; the lower end face of the upper rubber tube fixing platform and the upper end face of the lower rubber tube fixing platform are respectively provided with a first hook-shaped part; the upper rubber tube fixing platform abuts against the lower end of the outer cylinder. A bottom locking shaft is sleeved on the lower middle part of the central cylinder and threadedly connected to the central cylinder; the bottom locking shaft abuts against the lower end of the lower rubber cylinder fixing platform; The upper and lower clamping discs are respectively fitted around the outer periphery of the central cylinder and are located below the upper rubber cylinder fixing platform and above the lower rubber cylinder fixing platform, respectively. Six vertical rectangular lever blocks are evenly distributed around the outer periphery of the central cylinder, and the upper ends of the six vertical rectangular lever blocks are radially slidably connected to the upper pressing disc. Six lower vertical rectangular lever blocks are evenly distributed around the outer periphery of the central cylinder, and the lower ends of the six lower vertical rectangular lever blocks are radially slidably connected to the lower pressing disc. Six upper fan-shaped support members, the upper part of which is hinged to the upper end of the beam; the upper ends of the six upper fan-shaped support members are respectively hinged to the lower ends of the six upper vertical rectangular lever blocks. Six lower sector-shaped support members, the lower part of which is hinged to the lower end of the beam; the lower ends of the six lower sector-shaped support members are respectively hinged to the upper ends of the six lower vertical rectangular lever blocks. A rubber cylinder is provided around the outer periphery of the six upper fan-shaped supports and the six lower fan-shaped supports; the upper and lower ends of the rubber cylinder are respectively provided with second hook-shaped portions adapted to the first hook-shaped portions; the rubber cylinder is used to expand and deform under the support of the six upper fan-shaped supports and the six lower fan-shaped supports to form a sealed support with the inner wall of the sleeve.

[0010] Preferably, a resilient rubber washer is provided between the upper rubber cylinder fixing platform and the upper pressing disc, and between the lower pressing disc and the lower rubber cylinder fixing platform.

[0011] Preferably, six radially arranged grooves are provided on the lower end face of the upper pressing disc and the upper end face of the lower pressing disc, respectively; sliders adapted to the grooves are provided on the upper end of the upper vertical rectangular lever block and the lower end of the lower vertical rectangular lever block, and ball bearings are embedded in the sliders.

[0012] Preferably, the upper part of the upper fan-shaped support and the lower part of the lower fan-shaped support are respectively provided with clearance openings for the beam to pass through.

[0013] Preferably, the hydraulic shut-off assembly includes: A partition, which is horizontally arranged at the lower part of the central cylinder, is used to block the lower part of the inner cavity of the central cylinder; A limiting annular cavity is disposed on the inner circumference of the central cylinder above the partition plate; A bottom limiting cylinder is disposed on the partition plate; the upper part of the bottom limiting cylinder is located below the limiting ring cavity; the lower end of the bottom limiting cylinder is closed and the upper end is open; multiple half-shaft holes extending downward parallel to the axial direction to the middle of the bottom limiting cylinder are provided at the edge of the opening; a first one-way locking tooth is provided on the inner circumference of the upper part of the bottom limiting cylinder. An internal central shaft is axially positioned at the center of the central cylinder; a large-diameter top opening is provided at the upper end of the internal central shaft; the upper end of the large-diameter top opening is fixedly connected to the second periphery; an insertion part extending into the upper part of the bottom limiting cylinder is provided at the lower end of the internal central shaft, and a second one-way locking tooth adapted to the first one-way locking tooth is provided above the insertion part; the diameter of the second one-way locking tooth is larger than the diameter of the upper part of the bottom limiting cylinder; a third periphery extends outward from the lower part of the internal central shaft; the outer peripheral surface of the third periphery is adapted to the inner periphery of the central cylinder, and an annular groove is provided on the outer peripheral surface of the middle part of the third periphery; The shaft hole is located at the center of the internal central shaft and extends from top to bottom to the third perimeter. A radial opening is provided at the third periphery and communicates with the shaft hole and the annular groove. A guide groove is arranged parallel to and axially around the inner circumference of the central cylinder; the upper end of the guide groove is aligned with the upper end of the second arc-shaped insert, and the lower end of the guide groove reaches the lower part of the central cylinder and is located above the limiting ring cavity; the distance between the lower end of the guide groove and the limiting ring cavity is greater than the length of the third periphery. The first shear pin is radially disposed at the lower part of the central cylinder and passes through the central cylinder, the bottom limiting cylinder and the insertion part in sequence; A ball is thrown into the large-diameter top opening before pressing to seal the shaft hole; Multiple unidirectional elastic claw-shaped teeth are evenly distributed around the outer periphery of the second periphery and extend into the large-diameter top opening; External teeth are located at the lower end of the recovery shaft and are adapted to the one-way elastic claw teeth.

[0014] Preferably, it also includes: A guide block is disposed on the inner central axis, above the third periphery, and adapted to the guide groove.

[0015] Preferably, on the outer periphery of the third periphery, sealing ring grooves are provided above and below the annular groove, and a sealing ring for sealing and engaging with the inner periphery of the central cylinder is provided in the sealing ring groove.

[0016] The beneficial effects of this invention are: controlled by hydraulic pressure and tension, it can quickly seal and unseal and recycle. Attached Figure Description

[0017] Figure 1 This is a half-sectional view of a recyclable bridge plug that is quickly sealed based on a four-bar linkage supporting a rubber seat ring according to the present invention.

[0018] Figure 2 This is a cross-sectional view of the locking and releasing components in this invention.

[0019] Figure 3 This is a cross-sectional view of the sealing assembly in this invention.

[0020] Figure 4 This is a perspective view of the setting assembly in this invention (after removing the rubber cylinder).

[0021] Figure 5 This is a schematic diagram of the upper vertical rectangular lever block in this invention.

[0022] Figure 6 This is a cross-sectional view of the hydraulic blocking component in this invention.

[0023] Figure 7 This is a cross-sectional view of the bottom limiting cylinder in this invention.

[0024] Figure 8 This is a schematic diagram showing the engagement of the recovery shaft and the internal central shaft in this invention. Detailed Implementation

[0025] The invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0026] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] like Figure 1-8 As shown, the present invention provides a method for quickly sealing recyclable bridge plugs based on a four-bar linkage supporting a rubber setting ring, comprising: Top pressure cylinder 100; The center cylinder 200 is located directly below the top pressure cylinder 100; A locking and releasing assembly 300 is disposed at the upper end of the central cylinder 200 to lock or release the top pressure cylinder 100 from the central cylinder 200. The setting assembly 400 is disposed in the upper middle part of the central cylinder 200 and is used to form a sealing support with the inner wall of the sleeve; The hydraulic blocking component 500 is disposed inside the central cylinder 200 and is used to cooperate with the ball to block and conduct the pressurized fluid, thereby driving the setting component 400 to set and release. The recovery shaft 600 is used to be lowered during unsealing and cooperates with the hydraulic blocking assembly 500 to lift the ball and recover the hydraulic blocking assembly 500, the center cylinder 200, the setting assembly 400, and the locking and releasing assembly 300. The locking and releasing assembly 300 includes: The first step 110 is disposed on the outer periphery of the middle part of the top pressure cylinder 100; A keyway 120 is arranged parallel to the axial direction on the lower outer periphery of the top pressure cylinder 100; A locking sleeve 310 is disposed on the lower outer periphery of the top pressure cylinder 100; the upper end of the locking sleeve 310 abuts against the first step 110; a first periphery 311 extending inward is provided at the lower part of the locking sleeve 310; the inner periphery of the first periphery 311 is adapted to the lower outer periphery of the top pressure cylinder 100. An outer cylindrical tube 320 is disposed on the outer periphery of the locking sleeve 310; the upper inner periphery of the outer cylindrical tube 320 is adapted to the outer periphery of the locking sleeve 310; the upper end of the outer cylindrical tube 320 abuts against the first step 110; a second peripheral edge 321 extending inward is provided on the inner periphery of the middle part of the outer cylindrical tube 320; a pair of arc-shaped grooves are symmetrically arranged through the second peripheral edge 321; the second peripheral edge 321 abuts against the lower ends of the locking sleeve 310 and the top pressure cylinder 100; A first arc-shaped insert 330 and a second arc-shaped insert 340 are vertically disposed at the upper end of the central cylinder 200. The first arc-shaped insert 330 and the second arc-shaped insert 340 pass through corresponding arc-shaped grooves and are inserted between the lower part of the top pressure cylinder 100 and the first periphery 311. The inner periphery of the first arc-shaped insert 330 and the second arc-shaped insert 340 is adapted to the outer periphery of the lower part of the top pressure cylinder 100. The outer periphery of the first arc-shaped insert 330 and the second arc-shaped insert 340 is adapted to the inner periphery of the first periphery 311. A through locking key mounting groove is provided on the first arc-shaped insert 330. A locking key 350 is disposed within the locking key mounting groove; the width of the locking key 350 is adapted to the width of the keyway 120, and the length of the locking key 350 is less than the length of the keyway 120; the inner circumference of the locking key 350 is adapted to the bottom wall of the keyway 120; the outer circumference of the locking key 350 is adapted to the inner circumference of the first periphery 311; the locking key 350 is used to limit the axial position and rotation state of the top pressure cylinder 100, thereby realizing the locking or release of the top pressure cylinder 100 and the central cylinder 200.

[0028] In another embodiment, the upper and lower ends of the keyway 120 and the upper and lower ends of the locking key 350 are respectively provided with matching chamfer structures, the angle of the chamfer structures being 25°-35°.

[0029] In another embodiment, the setting assembly 400 includes: A hexagonal mounting plate 410 is fitted onto the middle of the central cylinder 200 and connected to the central cylinder by a second shear pin; beams 411 are respectively provided at the center of the six sides of the hexagonal mounting plate 410, which are arranged parallel to the axial direction, and the upper and lower ends of the beams 411 extend out of the side. The upper rubber tube fixing platform 420 and the lower rubber tube fixing platform 430 are respectively fitted onto the upper part and the middle part of the central cylinder 200, and are symmetrically arranged relative to the hexagonal locking platform 410; the outer edges of the lower end face of the upper rubber tube fixing platform 420 and the upper end face of the lower rubber tube fixing platform 430 are respectively provided with a first hook-shaped part; the upper rubber tube fixing platform 420 abuts against the lower end of the outer cylinder 320; The bottom locking shaft 440 is sleeved on the lower middle part of the central cylinder 200 and threadedly connected to the central cylinder 200; the bottom locking shaft 440 abuts against the lower end of the lower rubber cylinder fixing platform 430. The upper pressing disc 451 and the lower pressing disc 452 are respectively sleeved on the outer periphery of the central cylinder 200 and are respectively located below the upper rubber cylinder fixing platform 420 and above the lower rubber cylinder fixing platform 430. Six vertical rectangular lever blocks 461 are evenly distributed around the outer periphery of the central cylinder 200, and the upper ends of the six vertical rectangular lever blocks 461 are radially slidably connected to the upper pressing disc 451. Six lower vertical rectangular lever blocks 462 are evenly distributed around the outer periphery of the central cylinder 200, and the lower ends of the six lower vertical rectangular lever blocks 462 are radially slidably connected to the lower pressing disc 452. Six upper fan-shaped support members 471, the upper part of which is hinged to the upper end of the beam 411; the upper ends of the six upper fan-shaped support members 471 are respectively hinged to the lower ends of the six upper vertical rectangular lever blocks 461. Six lower sector-shaped support members 472, the lower part of which is hinged to the lower end of the beam 411; the lower ends of the six lower sector-shaped support members 472 are respectively hinged to the upper ends of the six lower vertical rectangular lever blocks 462. A rubber cylinder 480 is provided around the six upper fan-shaped supports 471 and six lower fan-shaped supports 472. The upper and lower ends of the rubber cylinder 480 are respectively provided with second hook-shaped portions that are adapted to the first hook-shaped portions. The rubber cylinder 480 is used to expand and deform under the support of the six upper fan-shaped supports 471 and six lower fan-shaped supports 472 to form a sealed support with the inner wall of the sleeve.

[0030] In another embodiment, a resilient rubber gasket 490 is provided between the upper rubber cylinder fixing platform 420 and the upper pressing disc 451 and between the lower pressing disc 452 and the lower rubber cylinder fixing platform 430, respectively, for sealing performance.

[0031] In another embodiment, six radially arranged grooves are provided on the lower end face of the upper pressing disc 451 and the upper end face of the lower pressing disc 452, respectively; sliders 463 adapted to the grooves are provided on the upper end of the upper vertical rectangular lever block 461 and the lower end of the lower vertical rectangular lever block 462, respectively, and ball bearings 464 are embedded in the sliders 463. During sealing, the upper end of the upper vertical rectangular lever block 461 and the lower end of the lower vertical rectangular lever block 462 move inward to facilitate the outward unfolding of the upper fan-shaped support 471 and the six lower fan-shaped support members 472; during unsealing, the upper end of the upper vertical rectangular lever block 461 and the lower end of the lower vertical rectangular lever block 462 move outward to facilitate the inward retraction of the upper fan-shaped support 471 and the six lower fan-shaped support members 472.

[0032] In another embodiment, the upper part of the upper fan-shaped support 471 and the lower part of the lower fan-shaped support 472 are respectively provided with clearance openings 473 for the beam 411 to pass through.

[0033] In another embodiment, the hydraulic shut-off assembly 500 includes: A partition 210 is horizontally disposed at the lower part of the central cylinder 200 to block the lower part of the inner cavity of the central cylinder 200; The limiting annular cavity 220 is disposed on the inner circumference of the central cylinder 200 above the partition plate 210; A bottom limiting cylinder 510 is disposed on the partition plate 210; the upper part of the bottom limiting cylinder 510 is located below the limiting ring cavity 220; the lower end of the bottom limiting cylinder 510 is closed and the upper end is open; multiple half-shaft holes 511 extending downward parallel to the axial direction to the middle of the bottom limiting cylinder 510 are provided at the edge of the opening; a first one-way retaining tooth 512 is provided on the inner circumference of the upper part of the bottom limiting cylinder 510. An internal central shaft 520 is axially positioned at the center of the central cylinder 200. A large-diameter top opening 521 is located at the upper end of the internal central shaft 520. The upper end of the large-diameter top opening 521 is fixedly connected to the second periphery 321. An insertion portion 522 extending into the upper part of the bottom limiting cylinder 510 is located at the lower end of the internal central shaft 520. Above the insertion portion 522 is a second one-way locking tooth 523 adapted to the first one-way locking tooth 512. The diameter of the second one-way locking tooth 523 is larger than the diameter of the upper part of the bottom limiting cylinder 510. During pressurization, the upper half of the bottom limiting cylinder 510 is radially outwardly expanded, locking the bottom limiting cylinder 510 to the central cylinder 200. A third periphery 524 extends outward from the lower part of the internal central shaft 520. The outer periphery of the third periphery 524 is adapted to the inner periphery of the central cylinder 200, and an annular groove 525 is provided on the outer periphery of the middle part of the third periphery 524. Shaft hole 526 is located at the center of the inner central shaft 520 and extends from top to bottom to the third periphery 524; A radial opening 527 is radially disposed at the third periphery 524 and communicates with the shaft hole 526 and the annular groove 525. A guide groove 230 is arranged parallel to and axially around the inner circumference of the central cylinder 200; the upper end of the guide groove 230 is aligned with the upper end of the second arc-shaped insert 340, and the lower end of the guide groove 230 reaches the lower part of the central cylinder 200 and is located above the limiting ring cavity 220; the distance between the lower end of the guide groove 230 and the limiting ring cavity 220 is greater than the length of the third periphery 524. The first shear pin 240 is radially disposed at the lower part of the central cylinder 200 and passes through the central cylinder 200, the bottom limiting cylinder 510 and the insertion part 522 in sequence. A ball is thrown into the large-diameter top opening 521 before being pressed to seal the shaft hole 526; Multiple unidirectional elastic claw-shaped teeth 250 are evenly distributed around the outer periphery of the second periphery 321 and extend into the large-diameter top opening 521. External teeth 610 are disposed at the lower end of the recovery shaft 600 and are adapted to the one-way elastic claw teeth 250.

[0034] In another embodiment, it also includes: The guide block 528 is disposed on the inner central axis 520, located above the third periphery 524, and is adapted to the guide groove 230.

[0035] In another embodiment, on the outer periphery of the third periphery 524, sealing ring 529 grooves are respectively provided above and below the annular groove 525, and sealing ring 529 for sealing cooperation with the inner periphery of the central cylinder 200 is provided in the sealing ring 529 groove.

[0036] During use, the recyclable bridge plug, supported by a four-bar linkage and a rubber seat ring, is quickly inserted into place. Then, the top pressure cylinder 100 is pressed down. The top pressure cylinder 100 causes the locking sleeve 310 and the outer cylinder 320 to move downwards along the outer periphery of the first arc-shaped insert 330. The locking key 350, initially located between the outer periphery of the first arc-shaped insert 330 and the locking sleeve 310, moves upwards along the keyway 120. When the outer periphery of the locking key 350 separates from the first periphery 311, the locking key 350 falls into the annular space formed by the first arc-shaped insert 330, the first periphery 311, the locking sleeve 310, and the first step 110. The top pressure cylinder 100 releases from the locking and releasing assembly 300. The top pressure cylinder 100 is then removed. The ball is thrown into the large-diameter top opening 521, blocking the shaft hole 526. Under hydraulic pressure, the outer... The cylinder 320 transmits pressure downwards, acting sequentially on the upper rubber cylinder fixing platform 420, the upper pressing disc 451, and the upper vertical rectangular lever block 461. The second shearing pin is sheared, and the hexagonal clamping platform 410 also moves downwards, pressing down the lower vertical rectangular lever block 462, the lower pressing disc 452, and the lower rubber cylinder fixing platform 430. Because the bottom locking shaft is threadedly connected to the central cylinder, the position remains fixed. When the upper vertical rectangular lever block 461 and the lower vertical rectangular lever block 462 are lowered under pressure, they rotate around the hinge fixed on the hexagonal clamping platform 410 as the axis of rotation. Through the lever principle, they quickly push the upper fan-shaped support 471 and the lower fan-shaped support 472 outwards. This action will simultaneously cause the rubber cylinder 480 to expand and deform, making it firmly pressed against the inner wall of the outermost sleeve. Simultaneously, the hydraulic pressure drives the internal central shaft 520 to move downward, the first shearing pin 240 between the bottom limiting cylinder 510 and the insertion part 522 is sheared, the second one-way locking tooth 523 is inserted into the bottom limiting cylinder 510 and meshes with the first one-way locking tooth 512; the upper part of the bottom limiting cylinder 510 is then radially expanded outward and locked with the central cylinder 200, completing the setting seal.

[0037] When it is necessary to unseal the bridge plug, the recovery shaft 600 with external teeth 610 is first precisely inserted axially into the large-diameter top opening 521 of the inner central shaft 520. The external teeth 610 of the recovery shaft 600 quickly engage with the one-way elastic claw teeth 250, forming a reliable mechanical connection. At this time, the recovery shaft 600 is pulled upward. Under the pulling force, the ball that was originally blocking the inner central shaft 520 is steadily pulled up by the one-way elastic claw teeth 250 and separated from the inner central shaft 520. This action instantly opens the channel between the upper and lower pipes, allowing the hydraulic pressure to be released, creating conditions for the subsequent unsealing operation. Continuing to pull the recovery shaft 600 upward, the first shearing pin 240 between the central cylinder 200 and the bottom limiting cylinder 510 is sheared. The bottom limiting cylinder 510 is unrestrained and begins to move upward with the recovery shaft 600. At this point, the downward pressure of the top pressure cylinder 100 and the outer cylinder 320 on the setting assembly 400 causes the components inside the setting assembly 400 to reset. The upper sector support 471 and the lower sector support 472 gradually retract, and the rubber cylinder 480 loses its support and returns to its initial state, thus achieving the unsealing of the setting mechanism. The recovery shaft 600 continues to lift upward. Since the upper diameter of the bottom limiting cylinder 510 has been expanded during the setting process, when the recovery shaft 600 continues to be pulled upward, the expanded diameter portion of the bottom limiting cylinder 510 will engage with the end face of the limiting ring cavity 220. This allows the recovery shaft 600 to drive the bridge plug to continue moving upward, ultimately retrieving the bridge plug completely from the pipeline, completing the entire unsealing and recovery process.

[0038] In summary, a recyclable bridge plug based on a four-bar linkage supporting a rubber seat ring for rapid sealing is described. It is controlled by hydraulic pressure and tension, enabling rapid sealing, rapid unsealing, and recycling.

[0039] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for rapid sealing and recyclable bridge plugs based on a four-bar linkage supporting a rubber setting ring, characterized in that... include: Top pressure cylinder; The center cylinder is located directly below the top pressure cylinder; A locking and releasing assembly is provided at the upper end of the central cylinder to lock or release the top pressure cylinder from the central cylinder; A setting assembly, which is disposed in the upper middle part of the central cylinder, is used to form a sealing support with the inner wall of the sleeve; A hydraulic blocking component, which is disposed inside the central cylinder, is used to cooperate with the ball to block and conduct the pressurized fluid, thereby driving the setting component to set and release. A recovery shaft is used to be lowered during unsealing and cooperates with the hydraulic blocking assembly to lift the ball and recover the hydraulic blocking assembly, the center cylinder, the setting assembly, and the locking and releasing assembly; The locking and releasing component includes: The first step is located on the outer periphery of the middle part of the top pressure cylinder; A keyway is provided parallel to the axial direction on the lower outer periphery of the top pressure cylinder; A locking sleeve is disposed on the lower outer periphery of the top pressure cylinder; the upper end of the locking sleeve abuts against the first step; a first periphery extending inward is provided on the lower part of the locking sleeve; the inner periphery of the first periphery is adapted to the lower outer periphery of the top pressure cylinder; An outer cylinder is disposed on the outer periphery of the locking sleeve; the upper inner periphery of the outer cylinder is adapted to the outer periphery of the locking sleeve; the upper end of the outer cylinder abuts against the first step; a second periphery extending inward is provided on the middle inner periphery of the outer cylinder; a pair of arc-shaped grooves are symmetrically arranged through the second periphery; the second periphery abuts against the lower ends of the locking sleeve and the top pressure cylinder; A first arc-shaped insert and a second arc-shaped insert are vertically disposed at the upper end of the central cylinder. The first and second arc-shaped inserts pass through corresponding arc-shaped grooves and are inserted between the lower part of the top pressure cylinder and the first periphery. The inner periphery of the first and second arc-shaped inserts is adapted to the outer periphery of the lower part of the top pressure cylinder. The outer periphery of the first and second arc-shaped inserts is adapted to the inner periphery of the first periphery. A through locking key mounting groove is provided on the first arc-shaped insert. A locking key is disposed within the locking key mounting groove; the width of the locking key is adapted to the width of the keyway, and the length of the locking key is less than the length of the keyway; the inner circumference of the locking key is adapted to the bottom wall of the keyway; the outer circumference of the locking key is adapted to the inner circumference of the first periphery; the locking key is used to limit the axial position and rotation state of the top pressure cylinder, thereby realizing the locking or release of the top pressure cylinder and the central cylinder.

2. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 1, characterized in that: The upper and lower ends of the keyway and the upper and lower ends of the locking key are respectively provided with matching chamfer structures, and the angle of the chamfer structure is 25°-35°.

3. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 1, characterized in that, The setting assembly includes: A hexagonal clamp is fitted into the middle of the central cylinder and connected to the central cylinder by a second shear pin; beams are provided at the center of the six sides of the hexagonal clamp, which are arranged parallel to the axial direction, and the upper and lower ends of the beams extend out of the sides respectively; The upper rubber tube fixing platform and the lower rubber tube fixing platform are respectively fitted onto the upper part and the middle part of the central cylinder, and are symmetrically arranged relative to the hexagonal clamping platform; the lower end face of the upper rubber tube fixing platform and the upper end face of the lower rubber tube fixing platform are respectively provided with a first hook-shaped part; the upper rubber tube fixing platform abuts against the lower end of the outer cylinder. A bottom locking shaft is sleeved on the lower middle part of the central cylinder and threadedly connected to the central cylinder; the bottom locking shaft abuts against the lower end of the lower rubber cylinder fixing platform; The upper and lower clamping discs are respectively fitted around the outer periphery of the central cylinder and are located below the upper rubber cylinder fixing platform and above the lower rubber cylinder fixing platform, respectively. Six vertical rectangular lever blocks are evenly distributed around the outer periphery of the central cylinder, and the upper ends of the six vertical rectangular lever blocks are radially slidably connected to the upper pressing disc. Six lower vertical rectangular lever blocks are evenly distributed around the outer periphery of the central cylinder, and the lower ends of the six lower vertical rectangular lever blocks are radially slidably connected to the lower pressing disc. Six upper fan-shaped support members, the upper part of which is hinged to the upper end of the beam; the upper ends of the six upper fan-shaped support members are respectively hinged to the lower ends of the six upper vertical rectangular lever blocks. Six lower sector-shaped support members, the lower part of which is hinged to the lower end of the beam; the lower ends of the six lower sector-shaped support members are respectively hinged to the upper ends of the six lower vertical rectangular lever blocks. A rubber cylinder is provided around the outer periphery of the six upper fan-shaped supports and the six lower fan-shaped supports; the upper and lower ends of the rubber cylinder are respectively provided with second hook-shaped portions adapted to the first hook-shaped portions; the rubber cylinder is used to expand and deform under the support of the six upper fan-shaped supports and the six lower fan-shaped supports to form a sealed support with the inner wall of the sleeve.

4. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 3, characterized in that: Resilient rubber washers are provided between the upper rubber cylinder fixing platform and the upper pressing disc, and between the lower pressing disc and the lower rubber cylinder fixing platform.

5. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 3, characterized in that: Six radially arranged grooves are provided on the lower end face of the upper pressing disc and the upper end face of the lower pressing disc, respectively; sliders adapted to the grooves are provided on the upper end of the upper vertical rectangular lever block and the lower end of the lower vertical rectangular lever block, and ball bearings are embedded in the sliders.

6. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 3, characterized in that: The upper part of the upper fan-shaped support and the lower part of the lower fan-shaped support are respectively provided with clearance openings for the beam to pass through.

7. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 1, characterized in that, The hydraulic blocking assembly includes: A partition, which is horizontally arranged at the lower part of the central cylinder, is used to block the lower part of the inner cavity of the central cylinder; A limiting annular cavity is disposed on the inner circumference of the central cylinder above the partition plate; A bottom limiting cylinder is disposed on the partition plate; the upper part of the bottom limiting cylinder is located below the limiting ring cavity; the lower end of the bottom limiting cylinder is closed and the upper end is open; multiple half-shaft holes extending downward parallel to the axial direction to the middle of the bottom limiting cylinder are provided at the edge of the opening; a first one-way locking tooth is provided on the inner circumference of the upper part of the bottom limiting cylinder. An internal central shaft is axially positioned at the center of the central cylinder; a large-diameter top opening is provided at the upper end of the internal central shaft; the upper end of the large-diameter top opening is fixedly connected to the second periphery; an insertion part extending into the upper part of the bottom limiting cylinder is provided at the lower end of the internal central shaft, and a second one-way locking tooth adapted to the first one-way locking tooth is provided above the insertion part; the diameter of the second one-way locking tooth is larger than the diameter of the upper part of the bottom limiting cylinder; a third periphery extends outward from the lower part of the internal central shaft; the outer peripheral surface of the third periphery is adapted to the inner periphery of the central cylinder, and an annular groove is provided on the outer peripheral surface of the middle part of the third periphery; The shaft hole is located at the center of the internal central shaft and extends from top to bottom to the third perimeter. A radial opening is provided at the third periphery and communicates with the shaft hole and the annular groove. A guide groove is arranged parallel to and axially around the inner circumference of the central cylinder; the upper end of the guide groove is aligned with the upper end of the second arc-shaped insert, and the lower end of the guide groove reaches the lower part of the central cylinder and is located above the limiting ring cavity; the distance between the lower end of the guide groove and the limiting ring cavity is greater than the length of the third periphery. The first shear pin is radially disposed at the lower part of the central cylinder and passes through the central cylinder, the bottom limiting cylinder and the insertion part in sequence; A ball is thrown into the large-diameter top opening before pressing to seal the shaft hole; Multiple unidirectional elastic claw-shaped teeth are evenly distributed around the outer periphery of the second periphery and extend into the large-diameter top opening; External teeth are located at the lower end of the recovery shaft and are adapted to the one-way elastic claw teeth.

8. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 7, characterized in that, Also includes: A guide block is disposed on the inner central axis, above the third periphery, and adapted to the guide groove.

9. The recyclable bridge plug with rapid sealing based on a four-bar linkage supporting a rubber seat ring as described in claim 7, characterized in that: On the outer periphery of the third circumference, sealing ring grooves are provided above and below the annular groove, and a sealing ring for sealing and engaging with the inner circumference of the central cylinder is provided in the sealing ring groove.

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