A releasable packoff device, a pull-apart release tool and applications

Abstract

This invention provides a resealable packer, a pull-out release tool, and its application. The packer includes a suspended packer, which comprises a setting drive unit, a reconnection unit, a slip and rubber sleeve unit, and a release unit connected in sequence. The slip and rubber sleeve unit includes a central tube, a setting assembly, slips, a setting assembly, and a rubber sleeve assembly. The release unit includes a connecting sleeve, a first release claw, a release sleeve, a lower connector, and a release shear pin. The lower end of the release sleeve passes through the lower connector and is connected to the lower connector via the release shear pin. The setting drive unit can drive the setting assembly and the setting assembly to push the slips and the rubber sleeve assembly to open radially to achieve setting and sealing. The pull-out release tool can be lowered into the suspended packer and pulled up to cut the release shear pin, causing the slips and the rubber sleeve assembly to retract and achieve release. This invention adds a pull-out release tool, which, compared to existing ball-drop release, is more conducive to improving the operational capability of horizontal well completion and staged production enhancement.

Description

Technical Field

[0001] This invention relates to the field of downhole tools technology for oil drilling and production, and more specifically, to a resealable packer, a pull-out resealable tool, and its application. Background Technology

[0002] Currently, when implementing segmented production enhancement in horizontal wells, production enhancement tools are run into the horizontal section, and a suspended packer is run into the vertical well or section with a small inclination by the drill pipe. After the suspended packer suspends the tool string in the horizontal section onto the casing, the drill pipe separates from the suspended packer, and then tubing is run back to reconnect the tool string, which is inserted into the reconnection sealing cylinder on the suspended packer for string reconnection. Existing suspended packers (Chinese patent: Split-type slip suspended packer, patent number: ZL201010216240.7) serve as suspension and top packers in open-hole segmentation tools for horizontal wells, and can only be used for fracturing and acidizing operations, with an operating temperature of 170℃ and an operating pressure differential of 70MPa. Subsequent upgraded suspended completion integrated packers (Chinese patent: Suspended completion integrated packer and completion string, patent number: ZL 202110810796.7) simplify the open-hole segmentation completion string, integrating suspension and completion functions, with an operating temperature of 200℃ and an operating pressure differential of 70MPa. Neither of these two types of suspended packers developed by the inventors can meet the open-hole segmentation requirements of the current block, which has an operating temperature of 200℃ and an operating pressure differential of 105MPa. Existing suspended packers mainly suffer from the following technical defects:

[0003] 1. Existing suspended packer rubber sleeve assembly materials are limited, the structure is simple to assemble, and the pressure-bearing capacity is restricted.

[0004] 2. The existing unsealing mechanism for suspended packers has poor reliability, and emergency unsealing technology needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to address at least one of the aforementioned shortcomings of the prior art. For example, one objective of this invention is to provide a resealable packer device, a pull-out unsealing tool, and its application, which can solve the technical problems existing in the prior art, such as the limited selection of materials for the suspension packer's rubber sleeve assembly, the simple structural assembly, the limited pressure-bearing capacity, and the poor reliability of the unsealing mechanism.

[0006] To achieve the above objectives, the present invention provides a resealable packer device. The packer device may include a suspended packer, which comprises a setting drive unit, a reconnection unit, a slip sleeve unit, and a release unit connected in sequence. The setting drive unit includes a first outer layer mechanism and a first inner layer mechanism, with the first outer layer mechanism sleeved outside the first inner layer mechanism, and a gap forming between the two mechanisms. The first inner layer mechanism includes an upper connector, a setting intermediate connector, a setting center tube, and a setting ball seat, connected in sequence, with the setting ball seat passing through the inner cavity of the setting center tube. The reconnection unit includes a second outer layer mechanism and a second inner layer mechanism, with the second outer layer mechanism sleeved outside the second inner layer mechanism and connected to the lower end of the first outer layer mechanism. The slip sleeve unit includes a third outer layer mechanism and a center tube, with the third outer layer mechanism sleeved outside the center tube. The structure includes a mounting assembly, a slip, a sealing assembly, and a rubber sleeve assembly. The mounting assembly is axially positioned at the upper and lower ends of the slip, the sealing assembly is axially positioned at the upper and lower ends of the rubber sleeve assembly, and the rubber sleeve assembly is axially spaced below the slip. The unsealing unit includes a connecting sleeve, a first unsealing claw, an unsealing sleeve, a lower connector, and unsealing shear pins. The connecting sleeve is fitted onto the central tube and axially positioned at the lower end of the sealing assembly. The lower connector is fixedly connected to the lower end of the connecting sleeve. The first unsealing claw is fitted onto the lower end of the central tube and passes through the connecting sleeve. Inside the sleeve; the upper end of the unsealing sleeve passes through the first unsealing spring claw, and the lower end of the unsealing sleeve passes through the lower connector and is connected to the lower connector through the unsealing shear pin; the first outer layer mechanism and the second outer layer mechanism can be pushed axially downward relative to the first inner layer mechanism and the second inner layer mechanism, and drive the sitting and sealing assembly and the sealing assembly to push the slip and the rubber sleeve assembly to open radially to achieve sitting and sealing; the central tube can be pushed upward and cut the unsealing shear pin and then move upward, driving the slip and the rubber sleeve assembly to contract radially to achieve unsealing.

[0007] Optionally, the first outer layer mechanism may include a first setting cylinder sleeve, a second setting cylinder sleeve, and a first setting piston connected in sequence, and further include a second setting piston disposed between the first setting cylinder sleeve and the setting intermediate joint; the first setting piston is sleeved and fitted against the outer wall of the setting center tube, and the side walls of the setting center tube and the setting intermediate joint are provided with through holes communicating with the gap between the first outer layer mechanism and the first inner layer mechanism; a setting ball can be inserted into the setting center tube to seal the upper end of the setting ball seat; the kill fluid in the inner cavity of the first inner layer mechanism can enter the gap between the first outer layer mechanism and the first inner layer mechanism along the through hole to drive the first outer layer mechanism downward relative to the first inner layer mechanism by pushing the first setting piston and the second setting piston.

[0008] Optionally, the reconnection unit may further include a thrust sleeve and a locking sleeve, which are sequentially connected to the lower end of the second outer mechanism. The thrust sleeve is fixedly connected to the central tube by a starting shear pin, and the thrust sleeve and locking sleeve can cut off the starting shear pin and move downward under the push of the second outer mechanism.

[0009] Alternatively, the seat-hanging assembly may include an upper cone and a lower cone. The upper cone is mounted on the upper end of the slip and connected to the lower end of the locking sleeve. The lower cone is mounted on the lower end of the slip. The upper and lower cones can be inserted into the gap between the slip and the central tube under the push of the locking sleeve to open the slip radially and achieve seat-hanging.

[0010] Alternatively, the setting assembly may include an upper rubber sleeve seat and a lower rubber sleeve seat. The upper rubber sleeve seat is installed between the setting assembly and the rubber sleeve group, and the lower rubber sleeve seat is installed between the connecting sleeve and the rubber sleeve group. The upper rubber sleeve seat can be pushed axially downward by the setting assembly to radially compress and bulge the rubber sleeve group to achieve setting.

[0011] Optionally, the rubber sleeve assembly may include a main rubber sleeve and auxiliary rubber sleeves respectively disposed at the upper and lower ends of the main rubber sleeve. The third outer layer mechanism also includes two sets of protective sleeve assemblies. Each set of protective sleeve assemblies includes a sealing support ring, a wrist guard, a first protective sleeve, and a second protective sleeve sequentially sleeved outside the central tube. Each set of protective sleeve assemblies also includes a reinforcing ring disposed between the first protective sleeve, the second protective sleeve, and the central tube. The two sets of protective sleeve assemblies are symmetrically disposed at the upper and lower ends of the rubber sleeve assembly.

[0012] Alternatively, the sealing support ring, wrist guard, and reinforcing ring may be made of metal, and the first and second sheaths may be made of composite materials.

[0013] Optionally, the packer may further include a pull-out release tool capable of extending into the suspended packer for release operations. The pull-out release tool includes an upper connecting section, a middle tube, a release assembly, a release mechanism, and a guide shoe. The middle tube passes through the lower end of the upper connecting section, the release assembly is sleeved on the middle tube and connected to the lower end of the upper connecting section, the release mechanism is connected to the lower end of the middle tube, and the guide shoe is connected to the lower end of the release assembly. The release assembly includes an elastic element, a second release claw, and a support sleeve. An elastic element is fitted outside the intermediate tube and positioned between the intermediate tube and the second release pawl. The upper end of the elastic element abuts against the lower end of the upper connecting section, and the lower end of the elastic element abuts against the step on the inner wall of the second release pawl. A support sleeve is fitted outside the intermediate tube. The elastic element can push the second release pawl downward along the intermediate tube and fit the lower end of the second release pawl onto the upper end of the support sleeve. The support sleeve can radially expand the second release pawl and engage it with the lower end of the central tube for releasing the suspension packer.

[0014] Optionally, the release assembly may include a connecting tube, a release pawl, and a release inner sleeve. The upper end of the connecting tube is fitted onto the lower section of the support sleeve and fixedly connected to the support sleeve. The lower end of the connecting tube is fitted onto the upper end of the guide shoe and fixedly connected to the guide shoe. The release pawl is located between the intermediate tube and the connecting tube. The upper end of the release pawl is fixedly connected to the intermediate tube, and the inner wall of the lower end of the release pawl is tightly fitted to the outer wall of the upper end of the release inner sleeve. The lower end of the release inner sleeve passes through the guide shoe and is fixedly connected to the guide shoe via a release scissor pin. The inner diameter of the release inner sleeve is smaller than the inner diameter of the intermediate tube. A release ball can be inserted into the intermediate tube to block the upper end of the release inner sleeve. The release inner sleeve can cut the release scissor pin under pressure and move downward until it detaches from the release pawl. The second release pawl can be lifted along with the intermediate tube and the upper connecting section and detach from the support sleeve, retracting radially to reset, thereby realizing the release and unblocking operation of the pull-type release tool in the suspended packer.

[0015] In another aspect, the present invention provides a pull-out unsealing tool, which may include an upper connecting section, a middle tube, an unsealing component, a release component, and a guide shoe. The middle tube passes through the lower end of the upper connecting section, the unsealing component is sleeved on the middle tube and connected to the lower end of the upper connecting section, the release component is connected to the lower end of the middle tube, and the guide shoe is connected to the lower end of the release component. The unsealing component includes an elastic element, a second unsealing claw, and a support sleeve. The second unsealing claw is sleeved outside the middle tube, and the elastic element is disposed between the middle tube and the second unsealing claw. The upper end of the elastic element abuts against the lower end of the upper connecting section, and the lower end of the elastic element abuts against a step on the inner wall of the second unsealing claw. The support sleeve is sleeved outside the middle tube. The elastic element can push the second unsealing claw downwards along the middle tube and sleeve the lower end of the second unsealing claw onto the upper end of the support sleeve. The support sleeve can radially expand the second unsealing claw and engage it with the lower end of the central tube, for unsealing the suspended packer.

[0016] Optionally, the release assembly may include a connecting tube, a release pawl, and a release inner sleeve. The upper end of the connecting tube is fitted onto the lower section of the support sleeve and fixedly connected to the support sleeve. The lower end of the connecting tube is fitted onto the upper end of the guide shoe and fixedly connected to the guide shoe. The release pawl is located between the intermediate tube and the connecting tube. The upper end of the release pawl is fixedly connected to the intermediate tube, and the inner wall of the lower end of the release pawl is tightly fitted to the outer wall of the upper end of the release inner sleeve. The lower end of the release inner sleeve passes through the guide shoe and is fixedly connected to the guide shoe by a release scissor pin. The inner diameter of the release inner sleeve is smaller than the inner diameter of the intermediate tube. A release ball can be inserted into the intermediate tube to block the upper end of the release inner sleeve. The release inner sleeve can cut the release scissor pin under pressure and move downward until it disengages from the release pawl. The second release pawl can be lifted along with the intermediate tube and the upper connecting section and disengage from the support sleeve, retracting radially to reset, thereby realizing the release and unlocking operation.

[0017] The above-mentioned resealable packer or pull-out release tool is used in downhole packing operations.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] 1. The rubber sleeve assembly in the suspended packer of the present invention adopts a triple combination of multiple materials and a symmetrical nested arrangement to prevent outburst protection of the main sealing rubber sleeve. Compared with the existing rubber sleeve assembly with single material and simple assembly, it can improve the pressure bearing capacity of the rubber sleeve and improve the performance of the suspended packer.

[0020] 2. The present invention places the rubber sleeve assembly below the slip, so that the sealing pressure difference acts directly on the slip, replacing the existing method of the sealing pressure difference being transmitted to the slip through the central tube, thus optimizing the stress condition of the suspended packer and protecting the central tube.

[0021] 3. The resealable packer device of the present invention adds a pull-up unsealing tool, which, compared with the existing ball-drop unsealing, realizes the full diameter of the inner tube of the tubing string, which is more conducive to improving the operational capability of horizontal well completion stage production enhancement. Attached Figure Description

[0022] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A cross-sectional view of a suspended packer in a resealable packer device according to an exemplary embodiment of the present invention is shown.

[0024] Figure 2 It shows Figure 1 A magnified view of a portion of point A in the middle.

[0025] Figure 3 It shows Figure 1 A magnified view of a section at point B.

[0026] Figure 4 A cross-sectional view of a pull-out release tool in a resealable packer according to an exemplary embodiment of the present invention is shown.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Setting drive unit; 11. First outer layer mechanism; 111. First setting cylinder liner; 112. Second setting cylinder liner; 113. First setting piston; 114. Second setting piston; 12. First inner layer mechanism; 121. Upper connector; 122. Setting intermediate connector; 123. Setting center tube; 124. Setting ball seat; 2. Reconnection unit; 21. Second outer layer mechanism; 211. Reconnection cylinder; 22. Second inner layer mechanism; 23. Thrust sleeve; 24. Locking sleeve; 25. Starting shear pin; 3. Slip and rubber sleeve unit; 31. Third outer layer mechanism; 311. Setting assembly; 3111. Upper cone; 3112. Lower cone; 312. Slip; 313. Setting assembly; 3131. Upper rubber sleeve seat; 3132. Lower rubber sleeve seat; 314. Rubber sleeve assembly; 3141. Main rubber tube, 3142, secondary rubber tube, 315, protective tube assembly, 3151, sealing support ring, 3152, wrist guard, 3153, first protective sleeve, 3154, second protective sleeve, 3155, reinforcing ring, 32, central tube, 4, unsealing unit, 41, connecting sleeve, 42, first unsealing spring claw, 43, unsealing sleeve, 44, lower connector, 45, unsealing shear pin, 5, upper connecting section, 51, connector, 52, first connecting pipe, 53, second connecting pipe, 6, intermediate tube, 7, unsealing assembly, 71, elastic element, 72, second unsealing spring claw, 73, support sleeve, 8, release assembly, 81, connecting tube, 82, release spring claw, 83, release inner sleeve, 84, release shear pin, 9, guide shoe, a, seat sealing ball, b, release ball, c, first pressurized chamber, d, second pressurized chamber. Detailed Implementation

[0029] In the following description, the resealable sealing device, pull-out tool, and applications of the present invention will be explained in detail with reference to exemplary embodiments.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Currently, when implementing staged production enhancement stimulation in horizontal well completions, the stimulation tool is run into the horizontal section, and a suspended packer is run into the vertical or less inclined section via drill pipe. Once the suspended packer suspends the tool string on the casing, the drill pipe separates from the suspended packer, and tubing is then run back to reconnect the tool string, inserting it into the reconnection sealing sleeve on the suspended packer. The suspended packers in this technology have the following main technical defects: 1. Existing suspended packer rubber sleeve assembly materials are limited, the structure is simple, and the pressure-bearing capacity is restricted. 2. The reliability of the existing suspended packer release mechanism is poor, and emergency release technology needs improvement.

[0034] This invention provides a resealable packer device, a pull-out unsealing tool, and its application. The packer device includes a suspended packer, which comprises a setting drive unit, a reconnection unit, a slip sleeve unit, and an unsealing unit connected in sequence. The setting drive unit includes a first outer layer mechanism and a first inner layer mechanism, with the first outer layer mechanism sleeved outside the first inner layer mechanism, forming a gap between them. The first inner layer mechanism includes an upper connector, a setting intermediate connector, a setting center tube, and a setting ball seat, connected in sequence, with the setting ball seat passing through the inner cavity of the setting center tube. The reconnection unit includes a second outer layer mechanism and a second inner layer mechanism, with the second outer layer mechanism sleeved outside the second inner layer mechanism and connected to the lower end of the first outer layer mechanism. The slip sleeve unit includes a third outer layer mechanism and a center tube, with the third outer layer mechanism sleeved outside the center tube. The structure includes a mounting assembly, a slip, a sealing assembly, and a rubber sleeve assembly. The mounting assembly is axially positioned at the upper and lower ends of the slip, the sealing assembly is axially positioned at the upper and lower ends of the rubber sleeve assembly, and the rubber sleeve assembly is axially spaced below the slip. The unsealing unit includes a connecting sleeve, a first unsealing claw, an unsealing sleeve, a lower connector, and unsealing shear pins. The connecting sleeve is fitted onto the central tube and axially positioned at the lower end of the sealing assembly. The lower connector is fixedly connected to the lower end of the connecting sleeve. The first unsealing claw is fitted onto the lower end of the central tube and passes through the connecting sleeve. Inside the sleeve; the upper end of the unsealing sleeve passes through the first unsealing spring claw, and the lower end of the unsealing sleeve passes through the lower connector and is connected to the lower connector through the unsealing shear pin; the first outer layer mechanism and the second outer layer mechanism can be pushed axially downward relative to the first inner layer mechanism and the second inner layer mechanism, and drive the sitting and sealing assembly and the sealing assembly to push the slip and the rubber sleeve assembly to open radially to achieve sitting and sealing; the central tube can be pushed upward and cut the unsealing shear pin and then move upward, driving the slip and the rubber sleeve assembly to contract radially to achieve unsealing.

[0035] The suspension packer of this invention features a rubber sleeve assembly with a triple-combination symmetrical nested arrangement of multiple materials to protect the main sealing rubber sleeve from outbursts. Compared to existing rubber sleeve assemblies with single materials and simple assembly, this design improves the pressure-bearing capacity of the rubber sleeves and enhances the performance of the suspension packer. This invention places the rubber sleeve assembly below the slips, allowing the packer pressure differential to act directly on the slips, replacing the existing method where the packer pressure differential is transmitted through the central tube to the slips. This optimizes the stress condition of the suspension packer and protects the central tube. Furthermore, the resealable packer device of this invention incorporates a pull-out tool, achieving full-bore unsealing of the tubing string compared to existing ball-drop unsealing methods. This is more conducive to improving the operational capabilities of horizontal well completion and staged production enhancement.

[0036] Exemplary Example 1

[0037] This exemplary embodiment provides a resealable sealing device.

[0038] Figure 1 A cross-sectional view of a suspended packer in a resealable packer device according to an exemplary embodiment of the present invention is shown; Figure 2 It shows Figure 1 A magnified view of a section at point A in the middle; Figure 3 It shows Figure 1 A magnified view of a section at point B in the middle; Figure 4 A cross-sectional view of a pull-out release tool in a resealable packer according to an exemplary embodiment of the present invention is shown.

[0039] like Figures 1 to 4 As shown in the exemplary embodiment, the resealable packer may include a suspended packer. The suspended packer may include a setting drive unit 1, a reconnection unit 2, a slip sleeve unit 3, and a release unit 4 connected sequentially from top to bottom. The setting drive unit 1 may include a first outer layer mechanism 11 and a first inner layer mechanism 12. The first outer layer mechanism 11 is sleeved outside the first inner layer mechanism 12, and a gap may be formed between the first outer layer mechanism 11 and the first inner layer mechanism 12. The first inner layer mechanism 12 may include an upper connector 121, a setting intermediate connector 122, a setting center tube 123, and a setting ball seat 124. The upper connector 121, the setting intermediate connector 122, and the setting center tube 123 are sequentially joined from top to bottom to form a whole. The setting ball seat 124 may be inserted into the setting center tube 123 and fixedly connected to the setting center tube 123 by shear pins. Figure 2 As can be seen, the inner diameter of the setting ball seat 124 is smaller than the inner diameter of the setting center tube 123.

[0040] The reconnection unit 2 may include a second outer layer mechanism 21 and a second inner layer mechanism 22. The second outer layer mechanism 21 may be sleeved outside the second inner layer mechanism 22. The second outer layer mechanism 21 may include a reconnection cylinder 211. The second outer layer mechanism 21 may be fixedly connected to the lower end of the first outer layer mechanism 11. Specifically, the reconnection cylinder 211 of the second outer layer mechanism 21 may be fixedly connected to the lower end of the first outer layer mechanism 11 by threads, and the second inner layer mechanism 22 may be fixedly connected to the lower end of the first inner layer mechanism 12 by threads.

[0041] The slip and rubber sleeve unit 3 may include a third outer layer mechanism 31 and a central tube 32. The third outer layer mechanism 31 is sleeved outside the central tube 32. The third outer layer mechanism 31 may include a seat assembly 311, a slip 312, a seat sealing assembly 313, and a rubber sleeve assembly 314. The seat assembly 311 may be axially installed at the upper and lower ends of the slip 312. The seat sealing assembly 313 may be axially installed at the upper and lower ends of the rubber sleeve assembly 314. The rubber sleeve assembly 314 and the seat sealing assembly 313 may be axially installed at the lower ends of the seat assembly 311 and the slip 312. The rubber sleeve assembly 314 and the slip 312 may be spaced apart by a certain distance.

[0042] The unsealing unit 4 may include a connecting sleeve 41, a first unsealing claw 42, an unsealing sleeve 43, a lower connector 44, and an unsealing shear pin 45. The connecting sleeve 41 can be sleeved on the lower end of the central tube 32 and axially fixed to the lower end of the setting assembly 313 by threads. The lower connector 44 can be fixedly connected to the lower end of the connecting sleeve 41 by threads. The first unsealing claw 42 can be fixedly connected to the lower end of the central tube 32 by threads and passes through the connecting sleeve 41. That is to say, the first unsealing claw 43... The upper end of the sealing claw 42 can be positioned between the central tube 32 and the connecting sleeve 41; the upper end of the unsealing sleeve 43 passes through the first unsealing claw 42, so that the outer wall of the upper end of the unsealing sleeve 43 is tightly fitted with the inner wall of the lower end of the first unsealing claw 42, that is, the lower end of the first unsealing claw 42 can be tightly clamped on the outer wall of the upper end of the unsealing sleeve 43; the lower end of the unsealing sleeve 43 can pass through the lower connector 44, and the unsealing sleeve 43 and the lower connector 44 can be fixedly connected by the unsealing scissor 45.

[0043] The first outer layer mechanism 11 and the second outer layer mechanism 21 can move downward relative to the first inner layer mechanism 12 and the second inner layer mechanism 22 under the action of downward pressure along the axial direction. This can push the seat assembly 311 to make the slip 312 open radially to achieve the seat action. At the same time, it can also push the sealing assembly 313 to squeeze the rubber tube assembly 314 along the axial direction to make it bulge out radially to achieve the sealing action.

[0044] Under axial upward pressure, the central tube 32 can cut the unsealing clip 45 through the first unsealing claw 42 and unsealing sleeve 43 connected to its lower end. After the unsealing clip 45 is cut, the central tube 32 can be released from restraint and can be lifted together with the first outer layer mechanism 11 and the second outer layer mechanism 21. This can drive the slip 312 and the rubber sleeve assembly 314 to retract radially and return to their initial state. It can also cause the seat assembly 311 and the seat sealing assembly 313 to move axially upward and return to their original position, thereby realizing the unsealing operation of the suspended packer.

[0045] In this embodiment, the first outer layer mechanism 11 may include a first setting cylinder liner 111, a second setting cylinder liner 112, a first setting piston 113, and a second setting piston 114. The first setting cylinder liner 111, the second setting cylinder liner 112, and the first setting piston 113 are connected sequentially from top to bottom to form the outer layer mechanism. The second setting piston 114 is installed between the first setting cylinder liner 111 and the setting intermediate joint 122. That is, the second setting piston 114 is installed in the gap between the outer layer mechanism and the inner layer mechanism to seal the gap. The first setting piston 113 can be tightly attached to the outer wall of the setting center tube 123.

[0046] Here, a first pressurized chamber c can be formed between the inner wall of the first setting cylinder liner 111, the outer wall of the setting intermediate joint 122, the upper end of the second setting piston 114, and the lower end of the upper joint 121. A second pressurized chamber d can be formed between the inner wall of the second setting cylinder liner 112, the outer wall of the setting center tube 123, the upper end of the first setting piston 113, and the lower end of the setting intermediate joint 122. Through holes are provided on the side walls of the setting intermediate joint 122 and the setting center tube 123, which can be connected to the first pressurized chamber c and the second pressurized chamber d respectively.

[0047] In this embodiment, the reconnection unit 2 further includes a thrust sleeve 23 and a locking sleeve 24. The thrust sleeve 23 and the locking sleeve 24 can be connected sequentially from top to bottom to the lower end of the second outer layer mechanism 21. At the same time, the thrust sleeve 23 and the locking sleeve 24 are sleeved on the central tube 32. The radial inner side of the thrust sleeve 23 is provided with a starting shear pin 25. The starting shear pin 25 can be inserted into the side wall of the central tube 32, thereby axially fixing the thrust sleeve 23 on the central tube 32. Under the push of the downward axial force applied by the first outer layer mechanism 11 and the second outer layer mechanism 21, the thrust sleeve 23 can cut off the starting shear pin 25 and push the locking sleeve 24 downward together to perform the setting operation of the suspended packer.

[0048] In this embodiment, the mounting assembly 311 may include an upper cone 3111 and a lower cone 3112. The upper cone 3111 can be installed on the upper end of the slip 312 and connected to the lower end of the locking sleeve 24. That is, the upper cone 3111 can be installed between the slip 312 and the locking sleeve 24, and the lower cone 3112 can be installed on the lower end of the slip 312. The cone tips of the upper cone 3111 and the lower cone 3112 can be inserted into the inner side of the slip 312, that is, into the gap between the slip 312 and the central tube 32, under the push of the locking sleeve 24 and the thrust sleeve 23. This allows the slip 312 to be opened radially and pressed tightly against the inner wall of the wellbore, thereby realizing the mounting operation of the slip.

[0049] In this embodiment, the setting assembly 313 may include an upper rubber sleeve seat 3131 and a lower rubber sleeve seat 3132. The upper rubber sleeve seat 3131 may be installed at the upper end of the rubber sleeve assembly 314 and at the lower end of the lower cone 3112. That is, the upper rubber sleeve seat 3131 is installed between the rubber sleeve assembly 314 and the lower cone 3112. The lower rubber sleeve seat 3132 may be installed at the lower end of the rubber sleeve assembly 314 and at the upper end of the connecting sleeve 41. That is, the lower rubber sleeve seat 3132 is installed between the rubber sleeve assembly 314 and the connecting sleeve 41. The upper rubber sleeve seat 3131 may be pushed downward along the axial direction by the upper component (lower cone 3112) to squeeze the rubber sleeve assembly 314, so that the rubber sleeve assembly 314 expands and protrudes radially and fits tightly against the inner wall of the wellbore to achieve the setting operation.

[0050] Optionally, the rubber sleeve assembly 314 may include a main rubber sleeve 3141 and two sets of auxiliary rubber sleeves 3142. The third outer layer mechanism 31 also includes two sets of protective sleeve assemblies 315. The two sets of auxiliary rubber sleeves 3142 are symmetrically installed at the upper and lower ends of the main rubber sleeve 3141, and the two sets of auxiliary rubber sleeves 3142 are tightly fitted with the main rubber sleeve 3141 to form an integrated structure. The two sets of protective sleeve assemblies 315 are symmetrically installed at the upper and lower ends of the two sets of auxiliary rubber sleeves 3142, and the protective sleeve assemblies 315 can provide axial protection for the rubber sleeve assembly 314, preventing the rubber sleeve assembly 314 from expanding and protruding radially under force and protruding axially in the annulus of the well wall, thus ensuring the setting and sealing effect of the rubber sleeve.

[0051] Alternatively, each of the two sets of sleeve assemblies 315 may include a sealing support ring 3151, a wrist guard 3152, a first protective sleeve 3153, a second protective sleeve 3154, and a reinforcing ring 3155. Specifically, the sleeve assembly 315 disposed at the upper end of the sleeve assembly 314 may include a sealing support ring 3151, a wrist guard 3152, a first protective sleeve 3153, and a second protective sleeve 3154 sequentially sleeved on the central tube 32 from top to bottom. The reinforcing ring 3155 may be installed between the first protective sleeve 3153, the second protective sleeve 3154, and the central tube 32. The reinforcing ring 3155 may be connected to the first protective sleeve 3153, the second protective sleeve 3154, and the central tube 32. The sheath 3154 and the central tube 32 are tightly fitted together; the sleeve assembly 315 disposed at the lower end of the rubber sleeve group 314 may include a second sheath, a first sheath, a wrist guard, and a sealing support ring, which are sequentially fitted onto the central tube 32 from top to bottom. The reinforcing ring may be installed between the first sheath, the second sheath, and the central tube, and the reinforcing ring may be tightly fitted with the first sheath, the second sheath, and the central tube; that is, the two sets of sleeve assemblies 315 may be symmetrically disposed at the upper and lower ends of the rubber sleeve group 314; however, the present invention is not limited thereto, and the components of the two sets of sleeve assemblies 315 may also be other types of components, and the present invention does not specifically limit them.

[0052] Alternatively, the main rubber sleeve 3141 and the auxiliary rubber sleeve 3142 may be made of the same or different materials, the sealing support ring 3151, the wrist guard 3152 and the reinforcing ring 3155 may be made of metal, and the first sheath 3153 and the second sheath 3154 may be made of composite materials. The present invention does not specifically limit the materials of the above components, and can make any selection according to actual operational needs.

[0053] When setting the suspended packer described in this embodiment is required, a setting ball a can be inserted from the upper end of the upper connector 121. Since the outer diameter of the setting ball a is smaller than the inner diameter of the upper connector 121, the intermediate setting connector 122, and the setting center tube 123, and the outer diameter of the setting ball a is larger than the inner diameter of the setting ball seat 124, the setting ball a can descend axially until it reaches the upper end of the setting ball seat 124, thereby sealing the upper end of the setting ball seat 124. Preferably, the upper end of the inner wall of the setting ball seat 124 can be provided with a chamfer that matches the outer surface of the setting ball a, so that the setting ball a and the upper end of the setting ball seat 124 fit better, which can improve the sealing performance of the setting ball a on the setting ball seat 124. At this time, kill fluid is introduced into the upper end of the upper connector 121 through the tubing string and pressure is applied. The sealing effect of the sealing ball a on the setting ball seat 124 prevents the kill fluid from continuing to descend along the setting ball seat 124. Instead, it enters the first pressurized chamber c and the second pressurized chamber d through the through holes on the side walls of the setting intermediate joint 122 and the setting center tube 123, respectively. As the pressure continues to increase, the kill fluid in the first pressurized chamber c and the second pressurized chamber d can simultaneously push the second setting piston 114 and the first setting piston 113 downward, thereby pushing the first outer layer mechanism 11, the second outer layer mechanism 21, the thrust sleeve 23, the locking sleeve 24, and the upper cone 3111 downward as a whole. This allows the slips 312 to open and achieve setting. The lower cone 3112 can push the upper rubber sleeve seat 3131 downward, thereby squeezing and expanding the rubber sleeve assembly 314 radially to achieve setting and sealing, ultimately realizing the setting operation of the suspended packer.

[0054] In this embodiment, the resealable packer described in this exemplary embodiment may further include a pull-out unsealing tool. The pull-out unsealing tool can be inserted into the suspended packer to perform the unsealing operation. The pull-out unsealing tool may include an upper connecting section 5, an intermediate tube 6, an unsealing component 7, a release component 8, and a guide shoe 9. The intermediate tube 6 can be threaded through the lower end of the upper connecting section 5 and connected to the upper connecting section 5 by threads. The unsealing component 7 can be sleeved on the intermediate tube 6, with its upper end sleeved on the lower end of the upper connecting section 5. The release component 8 can be fixedly connected to the lower end of the intermediate tube 6. The guide shoe 9 can be fixedly connected to the lower end of the release component 8 by threads.

[0055] The unsealing component 7 may include an elastic element 71, a second unsealing claw 72, and a support sleeve 73. The second unsealing claw 72 may be sleeved on the outside of the intermediate tube 6. The elastic element 71 may be installed between the intermediate tube 6 and the second unsealing claw 72. The upper end of the elastic element 71 may abut against the lower end of the upper connecting section 5, and the lower end of the elastic element 71 may abut against the step on the inner wall of the second unsealing claw 72. The support sleeve 73 may be sleeved on the outside of the intermediate tube 6, and the outer diameter of the upper end of the support sleeve 73 is larger than the outer diameter of the intermediate tube 6. When the second unsealing claw 72 is constrained by an axially upward force, it may be located in the upper section of the intermediate tube 6, that is, at the upper end of its travel stroke. The elastic element 71 can be compressed, and its lower radial protrusion is also located above the support sleeve 73. At this time, the second unsealing claw 72 is in the initial unopened state. When the second unsealing claw 72 is released from axial constraint, it can be pushed down axially under the elastic action of the elastic element 71 until its lower radial protrusion is sleeved on the upper end of the support sleeve 73. At this time, the lower end of the second unsealing claw 72 can be radially opened under the action of the support sleeve 73, and its lower radial protrusion can be locked at the lower end of the central tube 32 of the suspended packer. Thus, the lifting unsealing tool can be operated to unseal the suspended packer.

[0056] Optionally, the release assembly 8 may include a connecting tube 81, a release pawl 82, and a release inner sleeve 83. The upper end of the connecting tube 81 may be fitted onto the lower section of the support sleeve 73 and fixedly connected to it. The lower end of the connecting tube 81 may be fitted onto the upper end of the guide shoe 9 and fixedly connected to it. The release pawl 82 may be installed between the intermediate tube 6 and the connecting tube 81. The upper end of the release pawl 82 may be fixedly connected to the intermediate tube 6 by threads. The inner wall of the lower end of the release pawl 82 may be tightly fitted to the outer wall of the upper end of the release inner sleeve 83. That is, the release pawl 82 may be clamped at the upper end of the release inner sleeve 83 by the elastic action of its lower end. The lower end of the release inner sleeve 83 may be inserted into the guide shoe 9 and fixedly connected to it by a release scissor 84.

[0057] In this embodiment, the upper connecting section 5 may include a connector 51, a first connecting pipe 52, and a second connecting pipe 53 connected sequentially from top to bottom. The inner diameters of the connector 51, the first connecting pipe 52, and the second connecting pipe 53 are the same, and the inner cavities of the connector 51, the first connecting pipe 52, and the second connecting pipe 53 can communicate with the inner cavity of the intermediate pipe 6. The connection method between the connector 51, the first connecting pipe 52, and the second connecting pipe 53 can be arbitrarily selected. For example, the connector 51, the first connecting pipe 52, and the second connecting pipe 53 can be integrally formed to connect the upper connecting section 5. The present invention does not specifically limit this.

[0058] If the suspended packer sets prematurely due to an abnormal insertion, or if it needs to be retrieved during subsequent well workover, a release operation is required. The pull-type release tool can be inserted into the suspended packer from the upper end of the upper connector 121. During axial descent, the elastic element 71 is compressed, keeping the second release claw 72 in its initial, unopened position. When the radially protruding portion of the lower end of the second release claw 72 reaches below the central tube 32, the elastic element 71 pushes the second release claw 72 downwards. The second release claw 72 then opens radially under the action of the support sleeve 73, causing the radially protruding portion of its lower end to abut against the lower end of the central tube 32. At this point, the pull-type release tool can be pulled upwards. The second unsealing claw 72 can apply an upward axial force to the central tube 32. This axial force can be transmitted along the first unsealing claw 42 to the unsealing sleeve 43. When the axial force increases sufficiently, it can cut the unsealing clips 45 between the unsealing sleeve 43 and the lower connector 44. Then, by continuing to lift the lifting unsealing tool, the lower end of the first unsealing claw 42 can be separated from the unsealing sleeve 43. The unsealing sleeve 43 can fall downward into the lower connector 44. The first unsealing claw 42 can move upward with the central tube 32. At the same time, the third outer layer mechanism 31, the second outer layer mechanism 21 and the first outer layer mechanism 11 can move upward and return to their original positions. This causes the rubber sleeve assembly 314 and the slip 312 to shrink radially and return to their original shape, thereby realizing the unsealing operation of the suspension packer.

[0059] If an abnormality occurs during the unsealing of the suspended packer, the already lowered pull-type unsealing tool can be released to detach it from the suspended packer. Specifically, the release ball b can be inserted from the upper end of the connector 51 into the upper connecting section 5. The release ball b can then travel along the upper connecting section 5 and the intermediate pipe 6 to the upper end of the release inner sleeve 83. Since the outer diameter of the release ball b is larger than the inner diameter of the release inner sleeve 83, the release ball b can seal the release inner sleeve 83. At this time, kill fluid can be injected into the pull-type unsealing tool to pressurize and release the packer. The inner sleeve 83 can cut the release clip 84 under downward pressure. Continuing to apply pressure will cause the inner sleeve 83 to descend and detach from the lower end of the release claw 82. At this time, the upper connecting section 5 is lifted, and the intermediate tube 6, the release claw 82, and the second release claw 72 can move upward together. The second release claw 72 can leave the upper end of the support sleeve and retract radially to reset. The entire pull-type release tool can be lifted upward to suspend the packer, thus completing the release and release operation of the pull-type release tool in the suspended packer.

[0060] Exemplary Example 2

[0061] This exemplary embodiment provides a pull-out unsealing tool.

[0062] The pull-up unsealing tool described in this exemplary embodiment can be used to unseal the suspended packer described in Exemplary Embodiment 1, and can also be used to perform a release-and-unseal operation. It can also be used to unseal other suspended packers with structures that can be unsealed by lifting. The present invention does not specifically limit this.

[0063] The pull-type unsealing tool described in this exemplary embodiment has the same structure and function as the pull-type unsealing tool described in Exemplary Embodiment 1, and will not be described again in this exemplary embodiment.

[0064] Exemplary Example 3

[0065] This exemplary embodiment provides a method for applying a resealable packer in downhole packing operations.

[0066] The application method described in this exemplary embodiment may employ the resealable sealing device described in Exemplary Embodiment 1, or the pull-out unsealing tool described in Exemplary Embodiment 2.

[0067] like Figures 1 to 4 As shown in the exemplary embodiment, the application method described herein may include the following steps:

[0068] When setting the suspended packer described in this embodiment is required, a setting ball a can be inserted from the upper end of the upper connector 121. Since the outer diameter of the setting ball a is smaller than the inner diameter of the upper connector 121, the intermediate setting connector 122, and the setting center tube 123, and the outer diameter of the setting ball a is larger than the inner diameter of the setting ball seat 124, the setting ball a can descend axially until it reaches the upper end of the setting ball seat 124, thereby sealing the upper end of the setting ball seat 124. Preferably, the upper end of the inner wall of the setting ball seat 124 can be provided with a chamfer that matches the outer surface of the setting ball a, so that the setting ball a and the upper end of the setting ball seat 124 fit better, which can improve the sealing performance of the setting ball a on the setting ball seat 124. At this time, kill fluid is introduced into the upper end of the upper connector 121 through the tubing string and pressure is applied. The sealing effect of the sealing ball a on the setting ball seat 124 prevents the kill fluid from continuing to descend along the setting ball seat 124. Instead, it enters the first pressurized chamber c and the second pressurized chamber d through the through holes on the side walls of the setting intermediate joint 122 and the setting center tube 123, respectively. As the pressure continues to increase, the kill fluid in the first pressurized chamber c and the second pressurized chamber d can simultaneously push the second setting piston 114 and the first setting piston 113 downward, thereby pushing the first outer layer mechanism 11, the second outer layer mechanism 21, the thrust sleeve 23, the locking sleeve 24, and the upper cone 3111 downward as a whole. This allows the slips 312 to open and achieve setting. The lower cone 3112 can push the upper rubber sleeve seat 3131 downward, thereby squeezing and expanding the rubber sleeve assembly 314 radially to achieve setting and sealing, ultimately realizing the setting operation of the suspended packer.

[0069] If the suspended packer sets prematurely due to an abnormal insertion, or if it needs to be retrieved during subsequent well workover, a release operation is required. The pull-type release tool can be inserted into the suspended packer from the upper end of the upper connector 121. During axial descent, the elastic element 71 is compressed, keeping the second release claw 72 in its initial, unopened position. When the radially protruding portion of the lower end of the second release claw 72 reaches below the central tube 32, the elastic element 71 pushes the second release claw 72 downwards. The second release claw 72 then opens radially under the action of the support sleeve 73, causing the radially protruding portion of its lower end to abut against the lower end of the central tube 32. At this point, the pull-type release tool can be pulled upwards. The second unsealing claw 72 can apply an upward axial force to the central tube 32. This axial force can be transmitted along the first unsealing claw 42 to the unsealing sleeve 43. When the axial force increases sufficiently, it can cut the unsealing clips 45 between the unsealing sleeve 43 and the lower connector 44. Then, by continuing to lift the lifting unsealing tool, the lower end of the first unsealing claw 42 can be separated from the unsealing sleeve 43. The unsealing sleeve 43 can fall downward into the lower connector 44. The first unsealing claw 42 can move upward with the central tube 32. At the same time, the third outer layer mechanism 31, the second outer layer mechanism 21 and the first outer layer mechanism 11 can move upward and return to their original positions. This causes the rubber sleeve assembly 314 and the slip 312 to shrink radially and return to their original shape, thereby realizing the unsealing operation of the suspension packer.

[0070] If an abnormality occurs during the unsealing process of the suspended packer, the already lowered pull-type unsealing tool can be released to detach it from the suspended packer. Specifically, the release ball b can be inserted from the upper end of the connector 51 into the upper connecting section 5. The release ball b can then travel along the upper connecting section 5 and the intermediate pipe 6 to the upper end of the release inner sleeve 83. Since the outer diameter of the release ball b is larger than the inner diameter of the release inner sleeve 83, the release ball b can seal the release inner sleeve 83. At this time, kill fluid can be injected into the pull-type unsealing tool to pressurize and release the packer. The inner sleeve 83 can cut the release clip 84 under downward pressure. Continuing to apply pressure will cause the inner sleeve 83 to descend and detach from the lower end of the release claw 82. At this time, the upper connecting section 5 is lifted, and the intermediate tube 6, the release claw 82, and the second release claw 72 can move upward together. The second release claw 72 can leave the upper end of the support sleeve and retract radially to reset. The entire pull-type release tool can be lifted upward to suspend the packer, thus completing the release and release operation of the pull-type release tool in the suspended packer.

[0071] In summary, the rubber sleeve assembly in the suspended packer of this invention adopts a triple-combination symmetrical nested arrangement of multiple materials to protect the main sealing rubber sleeve from outbursts. Compared with the existing rubber sleeve assembly which uses a single material and is simple to assemble, this design can improve the pressure-bearing capacity of the rubber sleeve and enhance the performance of the suspended packer. This invention places the rubber sleeve assembly below the slips, so that the packer pressure differential acts directly on the slips, replacing the existing method of transmitting the packer pressure differential through the central tube to the slips. This optimizes the stress condition of the suspended packer and protects the central tube. The resealable packer device of this invention adds a pull-type unsealing tool, which, compared with the existing ball-drop unsealing method, realizes the full diameter of the inner tube of the tubing string, which is more conducive to improving the operational capability of horizontal well completion and staged production enhancement.

[0072] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A resealable packer device, characterized in that, The packer device includes a suspended packer, which comprises a setting drive unit, a reconnection unit, a slip sleeve unit, and a release unit connected in sequence. The setting drive unit includes a first outer layer mechanism and a first inner layer mechanism. The first outer layer mechanism is sleeved outside the first inner layer mechanism, and a gap is formed between the first outer layer mechanism and the first inner layer mechanism. The first inner layer mechanism includes an upper connector, a setting intermediate connector, a setting center tube, and a setting ball seat. The upper connector, the setting intermediate connector, and the setting center tube are connected in sequence, and the setting ball seat passes through the inner cavity of the setting center tube. The reconnection unit includes a second outer mechanism and a second inner mechanism. The second outer mechanism is sleeved outside the second inner mechanism. The second outer mechanism is connected to the lower end of the first outer mechanism, and the second inner mechanism is connected to the lower end of the first inner mechanism. The slip and rubber sleeve unit includes a third outer layer mechanism and a central tube. The third outer layer mechanism is sleeved outside the central tube. The third outer layer mechanism includes a seat assembly, a slip, a seat sealing assembly, and a rubber sleeve assembly. The seat assembly is axially arranged at the upper and lower ends of the slip, the seat sealing assembly is axially arranged at the upper and lower ends of the rubber sleeve assembly, and the rubber sleeve assembly is axially spaced below the slip. The unsealing unit includes a connecting sleeve, a first unsealing spring claw, an unsealing sleeve, a lower connector, and unsealing shear pins. The connecting sleeve is fitted onto the central tube and is axially positioned at the lower end of the setting assembly. The lower connector is fixedly connected to the lower end of the connecting sleeve. The first unsealing spring claw is fitted onto the lower end of the central tube and passes through the connecting sleeve. The upper end of the unsealing sleeve passes through the first unsealing spring claw, and the lower end of the unsealing sleeve passes through the lower connector and is connected to the lower connector via the unsealing shear pins. The first outer mechanism and the second outer mechanism can be pushed axially downward relative to the first inner mechanism and the second inner mechanism, and drive the seat assembly and the sealing assembly to push the slip and the rubber sleeve assembly to open radially to achieve seat and sealing; The central tube can be pushed upwards and cut the unsealing pins, then move upwards, causing the slips and rubber sleeve assembly to contract radially to achieve unsealing; The packer also includes a pull-out release tool, which can extend into the suspended packer to perform a release operation. The pull-out release tool includes an upper connecting section, a middle tube, a release assembly, a release mechanism, and a guide shoe. The intermediate tube passes through the lower end of the upper connecting section, the unsealing component is sleeved on the intermediate tube and connected to the lower end of the upper connecting section, the release component is connected to the lower end of the intermediate tube, and the shoe guide is connected to the lower end of the release component. The unsealing assembly includes an elastic element, a second unsealing claw, and a support sleeve. The second unsealing claw is sleeved outside the intermediate tube. The elastic element is positioned between the intermediate tube and the second unsealing claw. The upper end of the elastic element abuts against the lower end of the upper connecting section, and the lower end of the elastic element abuts against the step on the inner wall of the second unsealing claw. The support sleeve is sleeved outside the intermediate tube. The elastic element can push the second unsealing claw downward along the intermediate tube and sleeve the lower end of the second unsealing claw onto the upper end of the support sleeve. The support sleeve can radially expand the second unsealing claw and engage it with the lower end of the central tube for unsealing the suspended packer. The release assembly includes a connecting tube, a release pawl, and a release inner sleeve. The upper end of the connecting tube is fitted onto the lower section of the support sleeve and fixedly connected to the support sleeve. The lower end of the connecting tube is fitted onto the upper end of the guide shoe and fixedly connected to the guide shoe. The release pawl is located between the intermediate tube and the connecting tube. The upper end of the release pawl is fixedly connected to the intermediate tube, and the inner wall of the lower end of the release pawl is tightly fitted to the outer wall of the upper end of the release inner sleeve. The lower end of the release inner sleeve passes through the guide shoe and is fixedly connected to the guide shoe by a release scissor pin. The inner diameter of the release sleeve is smaller than the inner diameter of the intermediate tube. A release ball can be inserted into the intermediate tube to seal the upper end of the release sleeve. Under pressure, the release sleeve can cut the release pin and move downward until it disengages from the release claw. The second release claw can be lifted along with the intermediate tube and the upper connecting section and disengage from the support sleeve, retracting and resetting radially to realize the release and unblocking operation of the pull-type release tool in the suspension packer.

2. The resealable packer device according to claim 1, characterized in that, The first outer layer mechanism includes a first setting cylinder sleeve, a second setting cylinder sleeve, and a first setting piston connected in sequence, and also includes a second setting piston disposed between the first setting cylinder sleeve and the setting intermediate joint; the first setting piston is sleeved and fitted against the outer wall of the setting center tube, and the side walls of the setting center tube and the setting intermediate joint are provided with through holes communicating with the gap between the first outer layer mechanism and the first inner layer mechanism; a setting ball can be inserted into the setting center tube to seal the upper end of the setting ball seat; the kill fluid in the inner cavity of the first inner layer mechanism can enter the gap between the first outer layer mechanism and the first inner layer mechanism along the through hole to drive the first outer layer mechanism downward relative to the first inner layer mechanism by pushing the first setting piston and the second setting piston.

3. The resealable packer device according to claim 1, characterized in that, The reconnection unit also includes a thrust sleeve and a locking sleeve, which are sequentially connected to the lower end of the second outer layer mechanism. The thrust sleeve is fixedly connected to the central tube by a starting shear pin. The thrust sleeve and the locking sleeve can cut off the starting shear pin and move downward under the push of the second outer layer mechanism.

4. The resealable packer according to claim 3, characterized in that, The seat-hanging assembly includes an upper cone and a lower cone. The upper cone is installed on the upper end of the slip and connected to the lower end of the locking sleeve. The lower cone is installed on the lower end of the slip. The upper and lower cones can be inserted into the gap between the slip and the central tube under the push of the locking sleeve to open the slip radially and achieve seat-hanging.

5. The resealable packer according to claim 1, characterized in that, The setting assembly includes an upper rubber sleeve seat and a lower rubber sleeve seat. The upper rubber sleeve seat is installed between the setting assembly and the rubber sleeve group, and the lower rubber sleeve seat is installed between the connecting sleeve and the rubber sleeve group. The upper rubber sleeve seat can be pushed axially downward by the setting assembly to radially squeeze and bulge the rubber sleeve group to achieve setting.

6. The resealable packer according to claim 1, characterized in that, The rubber sleeve assembly includes a main rubber sleeve and auxiliary rubber sleeves respectively disposed at the upper and lower ends of the main rubber sleeve. The third outer layer mechanism also includes two sets of protective sleeve assemblies. Each set of protective sleeve assemblies includes a sealing support ring, a wrist guard, a first protective sleeve, and a second protective sleeve sequentially sleeved outside the central tube. Each set of protective sleeve assemblies also includes a reinforcing ring disposed between the first protective sleeve, the second protective sleeve, and the central tube. The two sets of protective sleeve assemblies are symmetrically disposed at the upper and lower ends of the rubber sleeve assembly.

7. The resealable packer according to claim 6, characterized in that, The sealing support ring, wrist guard, and reinforcing ring are made of metal, while the first and second sheaths are made of composite materials.

8. A pull-type unsealing tool, characterized in that, The pull-type unsealing tool can be applied to resealable packer devices, which include a suspended packer. The suspended packer comprises a setting drive unit, a reconnection unit, a slip sleeve unit, and an unsealing unit connected in sequence. The slip and rubber sleeve unit includes a third outer layer mechanism and a central tube. The third outer layer mechanism is sleeved outside the central tube. The third outer layer mechanism includes a seat and hang assembly, a slip, a seat and seal assembly, and a rubber sleeve assembly. The seat and hang assembly is axially arranged at the upper and lower ends of the slip, the seat and seal assembly is axially arranged at the upper and lower ends of the rubber sleeve assembly, and the rubber sleeve assembly is axially spaced below the slip. The pull-type unsealing tool includes an upper connecting section, a middle tube, an unsealing component, a release component, and a shoe guide. The intermediate tube passes through the lower end of the upper connecting section, the unsealing component is sleeved on the intermediate tube and connected to the lower end of the upper connecting section, the release component is connected to the lower end of the intermediate tube, and the shoe guide is connected to the lower end of the release component. The unsealing assembly includes an elastic element, a second unsealing claw, and a support sleeve. The second unsealing claw is sleeved outside the intermediate tube. The elastic element is positioned between the intermediate tube and the second unsealing claw. The upper end of the elastic element abuts against the lower end of the upper connecting section, and the lower end of the elastic element abuts against the step on the inner wall of the second unsealing claw. The support sleeve is sleeved outside the intermediate tube. The elastic element can push the second unsealing claw downward along the intermediate tube and sleeve the lower end of the second unsealing claw onto the upper end of the support sleeve. The support sleeve can radially expand the second unsealing claw and engage it with the lower end of the central tube for unsealing the suspended packer.

9. The lifting-type unsealing tool according to claim 8, characterized in that, The release assembly includes a connecting tube, a release pawl, and a release inner sleeve. The upper end of the connecting tube is fitted onto the lower section of the support sleeve and fixedly connected to the support sleeve. The lower end of the connecting tube is fitted onto the upper end of the guide shoe and fixedly connected to the guide shoe. The release pawl is located between the intermediate tube and the connecting tube. The upper end of the release pawl is fixedly connected to the intermediate tube, and the inner wall of the lower end of the release pawl is tightly fitted to the outer wall of the upper end of the release inner sleeve. The lower end of the release inner sleeve passes through the guide shoe and is fixedly connected to the guide shoe by a release scissor pin. The inner diameter of the release sleeve is smaller than the inner diameter of the intermediate tube. A release ball can be inserted into the intermediate tube to seal the upper end of the release sleeve. Under pressure, the release sleeve can cut the release pin and move downward until it is released from the release claw. The second release claw can be lifted along with the intermediate tube and the upper connecting section and detached from the support sleeve and retracted radially to reset, so as to realize the release and unlocking operation.

10. The application of the resealable packer as described in any one of claims 1 to 7 or the pull-out release tool as described in any one of claims 8 to 9 in downhole packing operations.

Images