A compression packer capable of repeated setting and unsetting

Abstract

This invention discloses a reusable packer for setting and unsetting, belonging to the field of packer technology. It includes a central tube, an outer sleeve fitted around the outer side of the arc-shaped groove central tube, a slip on the top of the outer sleeve, and a centering block on the side wall of the outer sleeve. It also includes a detection mechanism. During the setting process, when the central tube is lifted, the piston rod presses against the hydraulic chamber, pushing the piston pusher upwards. This deforms the centering block, increasing the stress between the centering block and the outside. The friction and anchoring stress between the outer sleeve and the outside are detected by the spring stress between the detection ring and the outer sleeve, as well as the hydraulic force between the piston rod and the hydraulic chamber. When the external fixing stress of the outer sleeve is insufficient and it moves upwards synchronously with the central tube, a second wedge expands to provide reverse anchoring stress for subsequent downward setting, limiting the displacement of the outer sleeve during setting and ensuring the stability of the setting operation.

Description

Technical Field

[0001] This invention relates to the field of packer technology, and more specifically, to a compression packer that can be repeatedly set and unset. Background Technology

[0002] The re-setting and unsetting compression packer is widely used in operations such as stratified water injection, fracturing, and oil testing. Its core function is to achieve stratum isolation and repetitive control. Through tubing string operation or hydraulic drive, the central tube is moved, causing the cone to open the slips and anchor the casing. Simultaneously, the rubber sleeve is compressed, radially expanding to seal the annulus, and the locking mechanism maintains the setting state. Upon unsetting, the locking force is released, the rubber sleeve rebounds, the slips retract, and the tool returns to its normal bore. Its advantages include reliable operation, high sealing differential, and the ability to set and unset multiple times without permanent damage to the rubber sleeve, reducing the number of tubing string trips and lowering costs. Furthermore, it can be adapted to different well conditions by changing the rubber sleeve, making it a key tool for efficient oil and gas field development.

[0003] Traditional compression packers primarily rely on friction with the casing wall to resist setting force. However, in harsh downhole environments, such as smooth casing walls, the presence of media affecting friction, or large well inclination angles, if the initial setting force is insufficient to overcome fluctuations in frictional resistance, a slight relative displacement will occur between the central tube and the rubber sleeve assembly, causing axial drift in the setting position. This prevents the packer from accurately aligning with the target formation, leading to layered packing failure or even sealing the wrong formation, severely impacting oilfield development.

[0004] How to invent a compression packer that can be repeatedly set and unset to improve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a compression packer that can be repeatedly set and unset, aiming to improve the problems mentioned in the background art.

[0006] This invention is implemented as follows:

[0007] This invention provides a resealable and re-setting compression packer, comprising a central tube, an outer sleeve fitted around the central tube, a slip plate at the top of the outer sleeve, and a centering block on the side wall of the outer sleeve, and further comprising:

[0008] The testing mechanism includes a hydraulic cavity 1 located inside the outer sleeve. A set of testing rings is fitted inside the outer sleeve. A piston rod is provided on the top of the testing rings. A piston that is movably fitted inside the hydraulic cavity 1 is provided on the top of the piston rod. A gear ring that cooperates with the testing rings is provided on the outer wall of the central tube. A sliding pin is provided on the outer wall of the central tube. A positioning groove, an upper sliding groove, and a lower sliding groove that cooperate with the sliding pin are provided on the inner wall of the outer sleeve.

[0009] The fastening mechanism includes drive blocks symmetrically and evenly distributed along the downward groove path on the inner wall of the outer sleeve. A rotating block is rotatably connected inside the drive block, and a drive cavity is opened inside the rotating block. A piston block is sleeved on the side of the drive cavity close to the downward groove. A transmission cavity is opened inside the outer sleeve, and a wedge block is sleeved inside the transmission cavity. An inlet is opened between the drive cavity and the transmission cavity, and a return port is also opened between the transmission cavity and the drive cavity. An anti-fall mechanism is also provided inside the outer sleeve. The anti-fall mechanism includes a drive tooth block opened on the inner side of the outer sleeve. A locking block is connected to the bottom of the drive tooth block. When the gear ring drives the drive tooth block to rotate, it pushes the locking block to extend and press against the outer well wall, increasing the resistance to the downward movement of the outer sleeve.

[0010] Preferably, a set of piston push blocks are connected to the bottom of the straightening block. The piston push blocks are movably connected to the hydraulic cavity, and hydraulic oil is provided between the piston push blocks and the piston at the top of the piston rod. A transmission pipe is provided inside the outer sleeve. The top opening of the transmission pipe is blocked by the piston at the bottom of the piston push block. After the piston push blocks move upward, they communicate with the inside of the hydraulic cavity.

[0011] Preferably, the lower halves of the upper slide groove and the lower slide groove overlap, the top of the upper slide groove is connected to the top of the positioning groove, and the top of the lower slide groove is connected to the middle area of ​​the positioning groove.

[0012] Preferably, the piston block has a chamfered angle on the side of its top that is close to the positioning groove, which cooperates with the sliding pin, and the drive block also has a notch on the top side of its side that is close to the positioning groove.

[0013] Preferably, the hydraulic chamber is provided with a set of baffles, and the surface of the baffles is provided with two sets of through grooves with one-way valves and different flow diameters.

[0014] Preferably, the wedge is designed to be distributed along the axial direction of the outer sleeve, and the wedge is designed to be inclined.

[0015] Preferably, the fall protection mechanism includes a limiting groove formed on the inner wall of the outer sleeve, a driving tooth block slidably connected inside the limiting groove, a driving groove formed on the outer wall of the outer sleeve, a locking block sleeved in the driving groove, an arc-shaped sliding groove rotatably connected to the side of the locking block away from the outer sleeve, the locking block being connected to the driving tooth block, a lower limiting shaft provided at the bottom of the locking block, an arc-shaped sliding groove cooperating with the lower limiting shaft provided at the top of the driving groove, a positioning shaft provided on the side of the locking block close to the outer sleeve, and a track cooperating with the positioning shaft provided on the inner wall of the driving groove. During the synchronous rotation of the locking block driven by the driving tooth block, the locking block is pushed to expand radially outward along the outer sleeve by the cooperation of the lower limiting shaft and the arc-shaped sliding groove, and the limiting of the positioning shaft and the track on the inner wall of the driving groove.

[0016] Preferably, the drive tooth block is rotatably connected to a toothed block that mates with the gear ring. The top of the drive tooth block has a slot, and the interior of the drive tooth block also has a rectangular groove with a depth greater than the slot. A rectangular block is provided at one end of the toothed block inside the drive tooth block. A drive slider that matches the rectangular groove is sleeved inside the rectangular block. A spring is provided between the drive slider and the rectangular block. An arc-shaped track that mates with the rectangular block is provided inside the drive tooth block.

[0017] Preferably, the limiting groove is provided with a second check strip and a first check strip that cooperate with the drive slider. The second check strip is located at the top of the inner wall of the limiting groove. A piston chamber is opened at the top of the inner wall of the limiting groove. The bottom opening of the transmission tube communicates with the piston chamber. A piston push rod is sleeved inside the piston chamber. The end of the piston push rod away from the piston chamber is connected to the first check strip. The first check strip is sleeved with the slot. The ends of the first check strip and the second check strip that are close to the drive slider are both provided with a chamfer.

[0018] Preferably, the card block has a hydraulic cavity two and a hydraulic cavity three inside. A connecting piston shaft is sleeved inside the hydraulic cavity two. One end of the connecting piston shaft extending to the outside of the card block is slidably connected to the inner side of the drive groove. A piston push rod two is sleeved in the hydraulic cavity three. One end of the piston push rod two extending to the outside of the drive groove is slidably connected to the wedge block two. A connecting cavity is opened at the end of the hydraulic cavity three and the hydraulic cavity two close to the outer sleeve to connect them. Hydraulic oil is filled between the hydraulic cavity three and the hydraulic cavity two.

[0019] In summary, the beneficial effects of this invention are:

[0020] 1. During the setting process, when the central tube is lifted, the piston rod can push the piston pusher block upward by applying pressure inside the hydraulic chamber 1, causing the centralizing block to deform and increase the stress between the centralizing block and the outside. At the same time, the friction and anchoring stress between the outer sleeve and the outside are detected by the spring stress between the detection ring and the outer sleeve, as well as the hydraulic force between the piston rod and the hydraulic chamber 1. When the external fixing stress of the outer sleeve is insufficient and it moves upward synchronously with the central tube, the gear ring rotates to drive the drive tooth block to rotate, thereby causing the locking block to move and unfold to fit against the outer casing well wall. The wedge block 2 unfolds synchronously to provide reverse anchoring stress for the subsequent downward setting, realizing the initial lifting to detect the fixing effect and providing additional anchoring effect when the anchoring is insufficient. During the subsequent setting, the displacement of the outer sleeve is limited, ensuring the stability of the setting operation.

[0021] 2. During the setting process, by detecting the distance the outer sleeve and the central tube move synchronously during the lifting process, the automatic guide pin selects the corresponding upper or lower sliding groove during the subsequent rotation and lowering process. If the outer sleeve and external stress are insufficient, the sliding pin, during the process of passing through the lower sliding groove, pushes the piston block towards the inside of the rotating block through the chamfer of the piston block, causing the first wedge to extend. At the same time, the stroke of the piston block extending to the outside of the rotating block is configured to increase non-linearly, and the corresponding extension degree of the first wedge gradually increases. During the rotation, the stress on the inner side of the well wall gradually increases due to the increase in the extension distance of the first wedge, providing reverse stress for the rotation of the central tube. Moreover, the stress can be distributed throughout the overall rotation process, which not only ensures the stability of the setting process, but also avoids the wear and deformation caused by excessive instantaneous stress on the first wedge. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the central tube provided in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the interior of the central tube provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the gear ring provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the disassembly of the central tube and outer sleeve provided in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the interior of the outer sleeve provided in an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the interior of a hydraulic cavity provided in an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the overall drive gear block provided in an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the interior of the drive tooth block provided in an embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the overall drive slot provided in an embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of card block splitting provided by an embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram of the internal structure of the card block provided in an embodiment of the present invention.

[0034] Figure 12 This is a schematic diagram showing the card block at different positions inside the drive slot according to an embodiment of the present invention.

[0035] Figure 13 This is a schematic diagram of the upper sliding groove and the lower sliding groove provided in an embodiment of the present invention.

[0036] Figure 14 This is a schematic diagram of the internal structure of the driver block provided in an embodiment of the present invention.

[0037] Figure 15 This is a schematic diagram of an overall wedge block provided in an embodiment of the present invention.

[0038] Figure 16 This is a schematic diagram of the distribution of the wedge block on the side wall of the outer sleeve according to an embodiment of the present invention.

[0039] Legend:

[0040] 100. Central tube; 101. Gear ring; 102. Sliding pin; 200. Outer sleeve; 201. Locking slip; 202. Centralizing block; 300. Hydraulic chamber one; 301. Detection ring; 302. Piston rod; 303. Piston push block; 304. Transmission tube; 305. Piston push rod one; 306. Piston chamber; 307. Check strip one; 308. Partition plate; 400. Positioning groove; 401. Upper sliding groove; 402. Lower sliding groove; 403. Drive block; 404. Rotating block; 405. Piston block; 406. Drive chamber; 407. Liquid inlet ; 408, Return port; 409, Transmission cavity; 410, Wedge block one; 500, Locking block; 501, Limiting groove; 502, Drive tooth block; 503, Check bar two; 504, Locking groove; 505, Tooth block; 506, Rectangular block; 507, Drive slider; 508, Rectangular groove; 600, Drive groove; 601, Arc-shaped slide groove; 602, Lower limit shaft; 603, Connecting piston shaft; 604, Positioning shaft; 605, Wedge block two; 606, Hydraulic cavity two; 607, Hydraulic cavity three; 608, Piston push rod two; 609, Connecting cavity. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Reference Figure 1-16 This invention provides a resealable and repositionable compression packer, comprising a central tube 100, an outer sleeve 200 sleeved around the central tube 100, a slip 201 disposed on the top of the outer sleeve 200, and a centering block 202 disposed on the side wall of the outer sleeve 200, and further comprising:

[0043] The detection mechanism includes a hydraulic cavity 300 inside the outer sleeve 200. A set of detection rings 301 are sleeved on the inner side of the outer sleeve 200. A piston rod 302 is provided on the top of the detection rings 301. A piston that is movably sleeved inside the hydraulic cavity 300 is provided on the top of the piston rod 302. A spring is also provided between the detection rings 301 and the outer sleeve 200. A gear ring 101 that cooperates with the detection rings 301 is provided on the outer wall of the central tube 100. A sliding pin 102 is provided on the outer wall of the central tube 100. A positioning groove 400, an upper sliding groove 401 and a lower sliding groove 402 that cooperate with the sliding pin 102 are provided on the inner wall of the outer sleeve 200.

[0044] The fastening mechanism includes drive blocks 403 symmetrically and evenly distributed along the path of the sliding groove 402 on the inner wall of the outer sleeve 200. A rotating block 404 is rotatably connected inside the drive blocks 403. A drive cavity 406 is formed inside the rotating block 404. A piston block 405 is sleeved on the side of the drive cavity 406 closest to the sliding groove 402. A transmission cavity 409 is formed inside the outer sleeve 200. A wedge block 410 is sleeved inside the transmission cavity 409. A spring is provided between the piston block 405 and the drive cavity 406. An inlet 407 is provided between the drive chamber 406 and the transmission chamber 409 to connect the drive chamber 406 and the transmission chamber 409. A return port 408 is also provided between the transmission chamber 409 and the drive chamber 406. An anti-fall mechanism is also provided inside the outer sleeve 200. The anti-fall mechanism includes a drive tooth block 502 opened on the inner side of the outer sleeve 200. A locking block 500 is connected to the bottom of the drive tooth block 502. When the gear ring 101 drives the drive tooth block 502 to rotate, it pushes the locking block 500 to extend and press against the outer well wall, increasing the resistance to the downward movement of the outer sleeve 200.

[0045] Furthermore, a set of piston push blocks 303 are connected to the bottom of the straightening block 202. The piston push blocks 303 are movably sleeved with the hydraulic cavity 300. Hydraulic oil is provided between the piston push blocks 303 and the top piston of the piston rod 302. A transmission pipe 304 is opened inside the outer sleeve 200. The top opening of the transmission pipe 304 is blocked by the bottom piston of the piston push blocks 303. After the piston push blocks 303 move upward, they communicate with the inside of the hydraulic cavity 300.

[0046] It should be noted that the lower halves of the upper slide groove 401 and the lower slide groove 402 overlap, the top of the upper slide groove 401 is connected to the top of the positioning groove 400, and the top of the lower slide groove 402 is connected to the middle area of ​​the positioning groove 400.

[0047] Furthermore, the piston block 405 has a chamfered angle on the side of its top that is close to the positioning groove 400, which cooperates with the sliding pin 102. When the sliding pin 102 moves from the positioning groove 400 along the lower groove 402, the chamfered angle on the top of the piston block 405 can push the piston block 405 into the liquid inlet 407. An arc-shaped spring is also provided between the rotating block 404 and the driving block 403 to assist the rotating block 404 in resetting. The top of the driving block 403 on the side close to the positioning groove 400 also has a notch. It should be noted that, through the notch, even if the sliding pin 102 resets and passes through the lower groove 402, the cooperation between the sliding pin 102 and the right-angle side of the piston block 405 will push the piston block 405 to drive the rotating block 404 to rotate. Through the notch, the rotating block 404 and the rotating block 404 can avoid the stress of the sliding pin 102, so that the piston block 405 will not apply pressure to the inside of the driving cavity 406, and prevent the wedge block 410 from being accidentally extended when lifting to unseal.

[0048] Furthermore, the hydraulic cavity 300 is equipped with a set of baffles 308. The surface of the baffles 308 has two sets of through grooves with one-way valves and different flow diameters. It should be noted that the flow diameter of the through groove from the piston rod 302 towards the piston pusher 303 is much larger than the flow diameter of the through groove from the piston pusher 303 towards the piston rod 302. This allows the piston pusher 303 to rise after being pumped into the upper part of the hydraulic cavity 300 through the baffles 308. The piston pusher 303 can then slowly return to its original position through the through groove with a lower flow diameter. This allows the deformation of the centering block 202 to continue for a certain period of time, which helps maintain circumferential stress during the setting process and improves the fixing effect and stability of the outer sleeve 200 during the setting process.

[0049] Specifically, wedge 410 is designed to be distributed along the axial direction of the outer sleeve 200, and wedge 410 is designed to be inclined. The inclination direction of wedge 410 is the same as the downward rotation direction of the central tube 100 during the setting process, so as to provide reverse stress for rotation during the setting process, avoid the outer sleeve 200 rotating synchronously with the central tube 100, and ensure the stability during the setting process. Along the direction from the positioning groove 400 towards the bottom of the sliding groove 402, the stroke of the piston block 405 extending to the outside of the rotating block 404 is configured to increase non-linearly, that is, the farther away from the positioning groove 400, the greater the distance the corresponding piston block 405 extends. It should be noted that when the sliding pin 102 passes by, the extended rotating block 404 The greater the external distance, the larger the area of ​​interaction with the sliding pin 102, which increases the volume and degree of compression of the piston block 405 by the sliding pin 102 on the drive cavity 406. This increases the extension distance of the subsequent wedge block 410, so that when the central tube 100 rotates during the setting process, the sliding pin 102 applies pressure to the piston block 405 one by one during the sliding process inside the sliding groove 402. As the corresponding wedge block 410 extends, the degree of extension of the corresponding wedge block 410 gradually increases, which can achieve staggered force distribution. During the rotation process, the stress between the outer sleeve 200 and the inner side of the well wall through the wedge block 410 gradually increases, which can distribute the stress throughout the overall rotation process.

[0050] It should be noted that the fall protection mechanism includes a limiting groove 501 formed on the inner wall of the outer sleeve 200. A driving tooth block 502 is slidably connected inside the limiting groove 501. A driving groove 600 is formed on the outer wall of the outer sleeve 200. A locking block 500 is sleeved in the driving groove 600. An arc-shaped sliding groove 601 is rotatably connected to the side of the locking block 500 away from the outer sleeve 200. The locking block 500 is connected to the driving tooth block 502. A lower limiting shaft 602 is provided at the bottom of the locking block 500. An arc-shaped sliding groove 601 that mates with the lower limiting shaft 602 is provided at the top of the driving groove 600. A positioning shaft 604 is provided on the side of the locking block 500 close to the outer sleeve 200. An inner wall of the driving groove 600 is provided with a feature that mates with the positioning shaft 604. During the synchronous rotation of the drive tooth block 502 and the locking block 500, the locking block 500 is pushed to expand radially outward along the outer sleeve 200 by the cooperation of the lower limit shaft 602 and the arc-shaped slide groove 601, and the limiting of the positioning shaft 604 and the inner side wall track of the drive groove 600. It should be noted that the top of the locking block 500 is also provided with a lower limit shaft 602 that cooperates with the drive tooth block 502, and the bottom of the drive tooth block 502 is provided with a slide groove corresponding to the lower limit shaft 602. When the drive tooth block 502 rotates, it drives the locking block 500 to slide synchronously. Through the cooperation of the lower limit shaft 602 and the arc-shaped slide groove 601, and the limiting of the positioning shaft 604 and the inner side wall track of the drive groove 600, the locking block 500 is pushed to expand outward.

[0051] Furthermore, the drive gear block 502 is rotatably connected to a toothed block 505 that mates with the gear ring 101. The top of the drive gear block 502 has a slot 504, and the interior of the drive gear block 502 also has a rectangular groove 508 with a depth greater than that of the slot 504. A rectangular block 506 is provided at one end of the toothed block 505 located inside the drive gear block 502. A drive slider 507 that matches the rectangular groove 508 is sleeved inside the rectangular block 506. A spring is provided between the drive slider 507 and the rectangular block 506. An arc-shaped track that mates with the rectangular block 506 is provided inside the drive gear block 502. An arc-shaped spring for resetting is also provided between the rectangular block 506 and the drive gear block 502.

[0052] Furthermore, the limiting groove 501 is internally equipped with a second check bar 503 and a first check bar 307 that cooperate with the drive slider 507. The second check bar 503 is located at the top of the inner wall of the limiting groove 501. It should be noted that after the gear ring 101 drives the drive tooth block 502 to rotate to its limit position via the tooth block 505, the position of the second check bar 503 corresponds exactly to the position of the drive slider 507. This allows the drive slider 507 to be pushed into the rectangular block 506, thereby disengaging the drive slider 507 from the rectangular groove 508. This ensures that when the gear ring 101 continues to rotate, it will only drive the tooth block 505 to rotate and then reset, preventing the drive tooth block 502 from rotating further, thus avoiding jamming of the device. A piston cavity 306 is opened at the top of the inner wall of the limiting groove 501. The bottom opening of the transmission tube 304 communicates with the piston cavity 306. A piston push rod 305 is sleeved inside the piston cavity 306. One end of the piston 305 away from the piston chamber 306 is connected to a check strip 307. The check strip 307 is sleeved with the slot 504. Both the check strip 307 and the check strip 503 have chamfered ends near the drive slider 507. When passing the drive slider 507, the drive slider 507 can be pushed away from the engagement with the rectangular slot 508, so that the drive slider 507 is pushed back into the rectangular block 506. At this time, when the gear ring 101 rotates and passes the toothed block 505, it can only drive the toothed block 505 to rotate inside the drive toothed block 502, and cannot drive the drive toothed block 502 to rotate as a whole. It should be noted that the end of the drive slider 507 near the rectangular slot 508 has a rounded corner. After being pushed away from the engagement with the rectangular slot 508, during the rotation of the toothed block 505, the rounded corner can further compress the drive slider 507 into the rectangular block 506, thereby facilitating the rotation of the toothed block 505.

[0053] Specifically, the internal cavity of the locking block 500 is provided with a second hydraulic cavity 606 and a third hydraulic cavity 607. A connecting piston shaft 603 is sleeved inside the second hydraulic cavity 606. One end of the connecting piston shaft 603 extending to the outside of the locking block 500 is slidably connected to the inner side of the drive groove 600. A piston push rod 608 is sleeved in the third hydraulic cavity 607. One end of the piston push rod 608 extending to the outside of the drive groove 600 is slidably connected to a second wedge block 605. A connecting cavity 609 is provided at the end of the third hydraulic cavity 607 and the second hydraulic cavity 606 that is close to the outer sleeve 200 to connect them. Hydraulic oil is filled between the third hydraulic cavity 607 and the second hydraulic cavity 606.

[0054] The working process of this re-setting and de-sealable compression packer is as follows:

[0055] First, position the sliding pin 102 at the lowest point of the positioning groove 400. Then, connect the central tube 100 to the end of the tubing string. Lower the central tube 100 and the outer sleeve 200 simultaneously to the predetermined depth. Then, perform the setting operation. During this process, first lift the central tube 100, so that the sliding pin 102 moves to the position of the upper sliding groove 401 at the top and rotates it. This causes the sliding pin 102 to move upward and then downward through the upper sliding groove 401, causing the central tube 100 to move downward as a whole. The outer sleeve 200 can remain relatively fixed due to the support and friction between the centralizing block 202 and the inner side of the well wall. Further downward movement of the rubber sleeve and cone on the side wall of the central tube 100 can push the slip 201 open and anchor it to the outer casing or well wall. As the central tube 100 moves further downward, the rubber sleeve is compressed and expands radially, achieving a seal.

[0056] During the setting process, when the central tube 100 is raised a specified distance and then rotated and lowered, if a stable frictional force and stress can be maintained between the outer sleeve 200 and the outer sleeve, during the raising of the central tube 100, the gear ring 101 pushes the detection ring 301 upward, further pushing the piston rod 302 upward to compress the inside of the hydraulic cavity 300, pushing the piston push block 303 upward, pushing the middle section of the centering block 202 to arch and deform, increasing the stress between it and the outer sleeve. At the same time, through the low reset speed of the partition 308, the deformation of the centering block 202 can be maintained for a certain period of time, which is conducive to maintaining circumferential stress during the setting process, ensuring the fixing effect of the outer sleeve 200 during the setting work, ensuring the accuracy of the setting position, and ensuring the quality of the setting work. Moreover, at this time, the piston rod 302 rises a certain distance.

[0057] It should be noted that when the outer sleeve 200 and the outer sleeve maintain a stable fixed relationship without slippage, the rising of the central tube 100 can drive the detection ring 301 a distance sufficient to push the piston push block 303 upward through the hydraulic transmission medium inside the bottom of the compressed hydraulic cavity 300, exposing the top opening of the transmission tube 304. This allows excess hydraulic medium to be transmitted through the transmission tube 304 to the piston cavity 306, pushing the piston push rod 305 and the check bar 307 to move synchronously. The check bar 307 moves inside the slot 504, and the chamfered angle of the check bar 307 close to the drive slider 507 can push the drive slider 507 into the rectangular block 506. This allows the gear ring 101 to rotate and engage with the toothed block 505. Because the toothed block 505 loses the engagement of the drive slider 507 inside the rectangular groove 508, it can only idle and reset inside the drive toothed block 502. This ensures that when the outer sleeve 200 and the outer casing have a stable anchoring force, the drive tooth block 502 will not rotate synchronously to start the device, reducing the pressure on the outer casing and well wall, and also reducing the wear and tear on the device. Moreover, since a spring is provided between the drive tooth block 502 and the outer sleeve 200, it can be reset to the initial position when there is no stress. In the initial position, the check bar 307 is close to the drive slider 507, so that only a small amount of hydraulic oil is needed to assist the transmission pipe 304 to push the check bar 307 to move and push the drive slider 507 back into the rectangular block 506. This ensures that only when the outer sleeve 200 and the outer casing maintain sufficient stress and are in a stable state can all the stress during the rise of the piston rod 302 be converted into the thrust of the piston push block 303 inside the hydraulic cavity 300, which is sufficient to push the piston push block 303 upward to expose the top inlet of the transmission pipe 304 and thus connect it.

[0058] During the sealing process, if the friction and stress between the outer sleeve 200 and the outer sleeve are insufficient when the central tube 100 is lifted, and the gear ring 101 rises, causing the detection ring 301 to move upward, the spring stress between the detection ring 301 and the outer sleeve 200, as well as the stress between the piston rod 302 and the hydraulic cavity 300, will cause the outer sleeve 200 to move upward synchronously. If the synchronous displacement distance of the outer sleeve 200 is too large, the displacement distance of the piston rod 302 inside the hydraulic cavity 300 will become smaller, resulting in a smaller upward distance of the piston pusher 303. The distance is insufficient to expose the transmission tube 304, and the hydraulic cavity 300 will not be connected to the transmission tube 304. During subsequent rotation and lowering of the gear ring 101, the gear ring 101 can drive the drive gear block 502 to rotate synchronously via the toothed block 505. At this time, the toothed block 505 can maintain synchronous rotation through the engagement of the drive slider 507 and the rectangular groove 508, driving the locking block 500 to move synchronously. The locking block 500 is limited and engaged by the inner positioning shaft 604 and the inner slide of the drive groove 600, as well as the connection between the lower limit shaft 602 and the arc-shaped slide groove 601. The sliding fit is also noteworthy. It should be noted that the bottom of the drive block 502 and the top of the locking block 500 are also provided with corresponding keyways. This allows the locking block 500 to gradually extend away from the outer sleeve 200 as it moves within the drive groove 600, thus expanding. Initially, the inner wall of the locking block 500 is in contact with the side wall of the drive groove 600. During the movement of the locking block 500, the arc-shaped design of its inner wall allows the connecting piston shaft 603 to gradually move towards the outer sleeve 200. When pulled in the 00 direction, the hydraulic oil medium inside the hydraulic cavity 2 606 can be pumped into the hydraulic cavity 3 607 through the connection of the connecting cavity 609. The movement of the piston rod 2 608 pushes the wedge 2 605 to automatically unfold as the locking block 500 rotates. Moreover, through the inclined design of the unfolded wedge 2 605, it can provide an upward anchoring force for the outer sleeve 200 during the subsequent lowering and setting process, thereby increasing the force on the outer sleeve 200 during the setting process. This facilitates the cone of the central tube 100 to open the slip 201 and form a stable setting and anchoring effect.

[0059] Furthermore, during the upward rotation of the central tube 100, if the outer sleeve 200 does not move significantly synchronously with the central tube 100, the rising central tube 100 can drive the sliding pin 102 to the top of the positioning groove 400. During the subsequent downward rotation, the sliding pin 102 slides along the inside of the upper sliding groove 401. If the outer sleeve 200 and the central tube 100 move synchronously and the synchronous displacement reaches a certain level, the central tube 100 will be difficult to move to the top of the positioning groove 400 after being raised a specified distance. During subsequent rotation, refer to... Figure 13-16During the rotation of the sliding pin 102 driven by the central tube 100, the rounded corners of the opening area connecting the upper sliding groove 401 and the lower sliding groove 402 allow the gear ring 101 to slide into the lower sliding groove 402. As the gear ring 101 slides within the lower sliding groove 402, it passes the piston block 405. The chamfered angle of the piston block 405 pushes it towards the rotating block 404, increasing the pressure inside the drive chamber 406. This pressure is then transmitted to the transmission chamber 409 through the inlet 407, pushing the wedge block 410 out. The longitudinal distribution of the wedge block 410 along the axis of the outer sleeve 200, combined with its inclination, provides a counterforce to the outer sleeve 200 during the rotation of the central tube 100, preventing the outer sleeve 200 from rotating synchronously with the central tube 100. This provides axial reaction force to the outer sleeve 200, ensuring stability during the setting process. Simultaneously, the piston... The stroke of block 405 extending outside the rotating block 404 is configured to increase non-linearly. When the sliding pin 102 passes by, the greater the distance it extends outside the rotating block 404, the larger the area of ​​interaction with the sliding pin 102. This increases the volume and degree of compression of the piston block 405 by the sliding pin 102, thereby increasing the extension distance of the subsequent wedge block 410. During the rotation of the central tube 100 during the setting process, the sliding pin 102 applies pressure to the piston block 405 one by one as it slides inside the sliding groove 402. This causes the extension degree of the corresponding wedge block 410 to gradually increase during its extension process, achieving staggered force distribution. During the rotation process, the stress between the outer sleeve 200 and the inner side of the well wall through the wedge block 410 gradually increases, dispersing the stress throughout the overall rotation process. This not only ensures the stability during the setting process but also avoids wear and deformation caused by excessive instantaneous stress on the wedge block 410.

[0060] When unsealing, the central tube 100 is lifted and rotated in the opposite direction, so that the central tube 100 is reset from the upper slide groove 401 to the central tube 100. After a short wait for the hydraulic mechanism such as the hydraulic chamber 300 to reset, the central tube 100 and the outer sleeve 200 can continue to move in the well to continue sealing at the designated position.

[0061] It should be noted that the transmission pipe 304 is provided with a set of one-way return channels with a flow diameter smaller than that of the transmission pipe 304, which are connected to the hydraulic chamber 300 to achieve slow automatic reset. One-way valves are also provided inside the return port 408 and the inlet port 407. The inlet port 407 is used to pump liquid into the transmission chamber 409, while the return port 408 unidirectionally returns the liquid inside the transmission chamber 409 into the drive chamber 406. Moreover, the flow cross-sectional area of ​​the return port 408 is smaller than that of the inlet port 407, which can achieve slow return reset at low speed, ensuring that the wedge block 410 can be extended for a period of time to maintain the setting process.

[0062] Through the design of check bar 1 307 and check bar 2 503, in the initial position, if the gear ring 101 rotates in the reverse direction, it will drive the drive tooth block 502 to move towards check bar 1 307, so that check bar 1 307 pushes the drive slider 507 into the rectangular block 506, causing the tooth block 505 to idle. At the same time, if the gear ring 101 rotates in the forward direction and drives the drive tooth block 502 to the limit position, check bar 2 503 cooperates with the drive slider 507 to push the drive slider 507 into the rectangular block 506. At this time, when the central tube 100 continues to rotate, the tooth block 505 also enters the idle state because it loses the engagement between the drive slider 507 and the rectangular groove 508.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A resealable and repositionable compression packer, comprising a central tube (100), an outer sleeve (200) sleeved around the central tube (100), a slip (201) provided at the top of the outer sleeve (200), and a centering block (202) provided on the side wall of the outer sleeve (200), characterized in that, Also includes: The detection mechanism includes a hydraulic cavity 1 (300) opened inside the outer sleeve (200). A set of detection rings (301) is sleeved on the inner side of the outer sleeve (200). A piston rod (302) is provided on the top of the detection rings (301). A piston that is movably sleeved inside the hydraulic cavity 1 (300) is provided on the top of the piston rod (302). A gear ring (101) that cooperates with the detection rings (301) is provided on the outer side wall of the central tube (100). A sliding pin (102) is provided on the outer side wall of the central tube (100). A positioning groove (400), an upper sliding groove (401), and a lower sliding groove (402) that cooperate with the sliding pin (102) are opened on the inner side wall of the outer sleeve (200). The fastening mechanism includes drive blocks (403) symmetrically and evenly distributed along the path of the sliding groove (402) on the inner wall of the outer sleeve (200). A rotating block (404) is rotatably connected inside the drive blocks (403). A drive cavity (406) is formed inside the rotating block (404). A piston block (405) is sleeved on the side of the drive cavity (406) close to the sliding groove (402). A transmission cavity (409) is formed inside the outer sleeve (200). A wedge block (410) is sleeved inside the transmission cavity (409). The drive cavity (406) and... An inlet (407) is provided between the transmission chamber (409), and a return port (408) is also provided between the transmission chamber (409) and the drive chamber (406). An anti-fall mechanism is also provided inside the outer sleeve (200). The anti-fall mechanism includes a drive tooth block (502) opened on the inner side of the outer sleeve (200). A locking block (500) is connected to the bottom of the drive tooth block (502). When the gear ring (101) drives the drive tooth block (502) to rotate, it pushes the locking block (500) to extend and press against the outer well wall, increasing the resistance of the outer sleeve (200) to move downward.

2. The resealable and repositionable compression packer according to claim 1, characterized in that, The bottom of the straightening block (202) is connected to a set of piston push blocks (303), the piston push blocks (303) are movably connected to the hydraulic cavity (300), and hydraulic oil is provided between the piston push blocks (303) and the piston at the top of the piston rod (302). The inner side of the outer sleeve (200) is provided with a transmission pipe (304).

3. A re-sealing and desealing compression packer according to claim 1, characterized in that, The lower halves of the upper slide groove (401) and the lower slide groove (402) overlap. The top of the upper slide groove (401) is connected to the top of the positioning groove (400), and the top of the lower slide groove (402) is connected to the middle area of ​​the positioning groove (400).

4. A re-sealing and desealing compression packer according to claim 1, characterized in that, The piston block (405) has a chamfered angle on the side of its top that is close to the positioning groove (400) to cooperate with the sliding pin (102), and the drive block (403) also has a notch on the top side of its side that is close to the positioning groove (400).

5. A resealable and repositionable compression packer according to claim 1, characterized in that, The hydraulic chamber 1 (300) is provided with a set of partitions (308), and the surface of the partitions (308) is provided with two sets of through grooves with one-way valves and different flow diameters.

6. A re-sealing and desealing compression packer according to claim 5, characterized in that, The wedge (410) is designed to be distributed along the axial direction of the outer sleeve (200), and the wedge (410) is designed to be inclined.

7. A re-sealing and desealing compression packer according to claim 2, characterized in that, The fall protection mechanism includes a limiting groove (501) formed on the inner side wall of the outer sleeve (200), a driving tooth block (502) being slidably connected inside the limiting groove (501), a driving groove (600) formed on the outer side wall of the outer sleeve (200), a locking block (500) being sleeved in the driving groove (600), an arc-shaped sliding groove (601) being rotatably connected to the side of the locking block (500) away from the outer sleeve (200), the locking block (500) being connected to the driving tooth block (502), a lower limiting shaft (602) being provided at the bottom of the locking block (500), and the driving groove (600)... The top of the device is provided with an arc-shaped slide groove (601) that cooperates with the lower limit shaft (602). The side of the card block (500) close to the outer sleeve (200) is provided with a positioning shaft (604). The inner wall of the drive groove (600) is provided with a track that cooperates with the positioning shaft (604). During the synchronous rotation of the card block (500) driven by the drive tooth block (502), the card block (500) is pushed to expand radially outward along the outer sleeve (200) by the cooperation of the lower limit shaft (602) and the arc-shaped slide groove (601) and the limiting of the positioning shaft (604) and the track on the inner wall of the drive groove (600).

8. A re-sealing and desealing compression packer according to claim 7, characterized in that, The drive tooth block (502) is rotatably connected to a toothed block (505) that mates with the gear ring (101). The top of the drive tooth block (502) is provided with a slot (504). The interior of the drive tooth block (502) is also provided with a rectangular groove (508) with a depth greater than that of the slot (504). A rectangular block (506) is provided at one end of the toothed block (505) located inside the drive tooth block (502). A drive slider (507) that matches the rectangular groove (508) is sleeved inside the rectangular block (506). A spring is provided between the drive slider (507) and the rectangular block (506). An arc-shaped track that mates with the rectangular block (506) is provided inside the drive tooth block (502).

9. A re-sealing and desealing compression packer according to claim 7, characterized in that, The limiting groove (501) is provided with a second check bar (503) and a first check bar (307) that cooperate with the drive slider (507). The second check bar (503) is located at the top of the inner wall of the limiting groove (501). A piston cavity (306) is opened at the top of the inner wall of the limiting groove (501). The bottom opening of the transmission tube (304) is connected to the piston cavity (306). A piston push rod (305) is sleeved inside the piston cavity (306). The end of the piston push rod (305) away from the piston cavity (306) is connected to the first check bar (307). The first check bar (307) is sleeved with the slot (504). The ends of the first check bar (307) and the second check bar (503) close to the drive slider (507) are both provided with a chamfer.

10. A resealable and repositionable compression packer according to claim 7, characterized in that, The internal cavity of the locking block (500) is provided with a hydraulic cavity two (606) and a hydraulic cavity three (607). A connecting piston shaft (603) is sleeved inside the hydraulic cavity two (606). One end of the connecting piston shaft (603) extending to the outside of the locking block (500) is slidably connected to the inner side of the drive groove (600). A piston push rod two (608) is sleeved in the hydraulic cavity three (607). One end of the piston push rod two (608) extending to the outside of the drive groove (600) is slidably connected to the wedge block two (605). A connecting cavity (609) is provided at the end of the hydraulic cavity three (607) and the hydraulic cavity two (606) close to the outer sleeve (200) to connect them. Hydraulic oil is filled between the hydraulic cavity three (607) and the hydraulic cavity two (606).

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