A highly sealing retrievable anchor packer

Abstract

The present application relates to the technical field of oilfield development, and provides a highly sealing recoverable anchored packer, which comprises a hollow tube, a plugging member, an expansion cylinder, a driving cylinder and at least one slip assembly, wherein a first limiting ring and a second limiting ring are arranged on the outer side of the hollow tube; an opening of the hollow tube close to the first limiting ring is blocked by the plugging member, and liquid is injected into the hollow tube from another opening, and part of the liquid enters a cavity formed by the driving cylinder, the first limiting ring and the hollow tube to move the driving cylinder; under the action of the driving cylinder, the inclined body squeezes the expansion cylinder, the expansion cylinder expands radially, and the slip assembly is unfolded along the inclined body to realize the setting of the packer; when the packer is unsealed, the injection of liquid is stopped, and the hollow tube is pulled outward along the working well to discharge the liquid in the cavity, and the slip assembly is reset under the action of the rebound member, so that the packer can be quickly unsealed and easily recovered to avoid well jamming accidents.

Description

Technical Field

[0001] The present application relates to the technical field of oilfield development, and in particular to a highly sealing retrievable anchor packer. Background Art

[0002] The packer is mainly used to seal the annulus between oil casing and casing, and is widely used in engineering applications such as drilling, completion, and cementing. It can be used for production, water (gas) injection, interlayer isolation and other operations.

[0003] When setting the expansion packer currently used, it is generally necessary to squeeze the slips by external force so that the slips can be expanded along the inclined surface of the cone set accordingly and embedded in the well wall.

[0004] During the process of unsealing the packer, since the slips are embedded in the well wall, it is difficult to recover them, the unsealing effect is poor, and well jamming accidents are prone to occur. Summary of the invention

[0005] The present application provides a highly sealable recoverable anchor packer, which is used to solve the problem of difficulty in recovering slips during the packer unsealing process.

[0006] The present application provides a highly sealing retrievable anchor packer, comprising:

[0007] The hollow tube has a first limiting ring and a second limiting ring disposed on its outer side.

[0008] The sealing member is used to seal the opening of the hollow tube close to the first limiting ring.

[0009] The expansion cylinder is sleeved on the outer side of the hollow tube and is located between the first limiting ring and the second limiting ring.

[0010] The driving cylinder is slidably sleeved on the outer side of the first limiting ring. The side of the driving cylinder facing the hollow tube, the side wall of the first limiting ring and the outer wall of the hollow tube form a cavity, and the cavity is communicated with the hollow tube.

[0011] At least one slip assembly includes a rebound member, a slip member and an italic body slidably arranged between a first limiting ring and a second limiting ring, the slip member is connected to the italic body, the italic body abuts against the expansion cylinder, and two ends of the rebound member are respectively connected to the slip member and the hollow tube.

[0012] The inclined body is configured to squeeze the expansion cylinder to cause the slip member to expand along the inclined body when liquid enters the cavity through the hollow tube to drive the driving cylinder to move toward the second limiting ring.

[0013] The resilient member is configured to drive the slip member to reset when the hollow tube moves outward along the working well to discharge the liquid in the cavity.

[0014] In a possible implementation, a mounting groove is provided on the outer wall of the hollow tube, the resilient member is fixed in the mounting groove, and one end of the resilient member away from the mounting groove is connected to the slip member.

[0015] In a possible implementation, there are two slip assemblies, which are respectively located on both sides of the expansion cylinder, and each slip assembly is connected to the corresponding iterative body through a first shear member.

[0016] In a possible implementation, the driving cylinder is connected to the hollow tube via a second shear member, and the shear strength of the second shear member is smaller than the shear strength of the first shear member.

[0017] In a possible implementation, the shear strength of the first shear member close to the first limiting ring is greater than the shear strength of the first shear member close to the second limiting ring.

[0018] In a possible implementation, the driving cylinder includes a housing, a driving block and a slider, the housing is slidably sleeved on the outside of the first limiting ring, and one end of the housing away from the first limiting ring is connected to the slip assembly close to the first limiting ring;

[0019] The driving block and the slider are both slidably arranged between the outer shell and the hollow tube. The outer shell, the first limiting ring, the driving block and the hollow tube are arranged to form a cavity. The slider abuts against one end of the outer shell away from the first limiting ring. The second shearing piece connects the driving block, the slider and the hollow tube in sequence.

[0020] In one possible implementation, the cava assembly also includes a constraint sleeve, which is slidably mounted on the outside of the hollow tube. The constraint sleeve and the hollow tube form an installation cavity. The cava member is arranged in the installation cavity and connected to the constraint sleeve. The cava part of the cava member extends out of the installation cavity and is connected to the inclined surface of the bevel.

[0021] In one possible implementation, an expansion ring and a top ring are also sleeved on the outside of the hollow tube, the expansion ring abuts against the side of the second limiting ring facing the first limiting ring, the top ring is connected to the cava assembly close to the second limiting ring, and the top ring abuts against the side of the expansion ring away from the second limiting ring.

[0022] In a possible implementation, at least two layers of protective elements are provided between the inclined body and the expansion cylinder.

[0023] In a possible implementation, the expansion cylinder includes a plurality of expansion members slidably sleeved on the outside of the hollow tube, two adjacent expansion members are separated by a spacer ring, and the two italics are respectively connected to the corresponding expansion members.

[0024] The highly sealing recoverable anchored packer provided by the present application comprises a hollow tube, a plugging member, an expansion cylinder, a driving cylinder and at least one cava assembly, wherein a first limiting ring and a second limiting ring are arranged on the outer side of the hollow tube; an opening of the hollow tube close to the first limiting ring is blocked by the plugging member, and liquid is injected into the hollow tube from another opening, and part of the liquid enters a cavity formed by the driving cylinder, the first limiting ring and the hollow tube to move the driving cylinder; under the action of the driving cylinder, the inclined body squeezes the expansion cylinder, the expansion cylinder expands radially, and the cava member unfolds along the inclined body to realize the setting of the packer; when the packer is unsealed, the injection of liquid is stopped, and the hollow tube is pulled outward along the working well to discharge the liquid in the cavity, and the cava member is reset under the action of the rebound member for easy recovery, so that the packer can be quickly unsealed to avoid well sticking accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1 A schematic cross-sectional structure diagram of a packer provided in one embodiment of the present application;

[0027] Figure 2 A schematic cross-sectional structure diagram of a drive cylinder and a slip assembly in a packer provided in an embodiment of the present application;

[0028] Figure 3 A schematic cross-sectional structure diagram of an expansion cylinder and a slip assembly in a packer provided in an embodiment of the present application;

[0029] Figure 4 A schematic cross-sectional structure diagram of a slip assembly and a second limiting ring in a packer provided in an embodiment of the present application;

[0030] Figure 5 A schematic cross-sectional structure diagram of an oblique body and an expansion tube in a packer provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the cross-sectional structure of an expansion body in a packer provided in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1-hollow tube; 11-first limiting ring; 12-second limiting ring; 13-cavity;

[0034] 2- blocking piece;

[0035] 3-expansion cylinder; 31-expansion member; 32-spacer ring;

[0036] 4-driving cylinder; 41-housing; 42-driving block; 43-sliding block;

[0037] 5-slip assembly; 51-rebound member; 52-slip member; 53-italic body; 54-constraint sleeve; 55-slip ring;

[0038] 61-first shearing member; 62-second shearing member;

[0039] 71- expansion ring; 72- top ring;

[0040] 8- Protective parts.

[0041] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] As shown in the background technology, for production wells, the production layer needs to be sealed during the production process, and the rubber tube is squeezed to expand to the inner wall of the production well casing. When the packer is set, it is generally necessary to squeeze the slips by external force so that the slips are expanded along the inclined surface of the cone corresponding to it and embedded in the well wall. During the unsealing process of the packer, since the slips are embedded in the well wall, it is difficult to recover the slips, and it is impossible to unseal quickly, which is prone to well jamming accidents.

[0044] Based on this, the highly sealing recoverable anchored packer provided by the present application includes a hollow tube, a sealing member, an expansion cylinder, a driving cylinder and at least one cava assembly, and a first limiting ring and a second limiting ring are arranged on the outside of the hollow tube; the opening of the hollow tube close to the first limiting ring is blocked by the sealing member, and liquid is injected into the hollow tube from the other opening, and part of the liquid enters the cavity formed by the driving cylinder, the first limiting ring and the hollow tube to move the driving cylinder; under the action of the driving cylinder, the inclined body squeezes the expansion cylinder, the expansion cylinder expands radially, and the cava member unfolds along the inclined body to realize the sealing of the packer; when the packer is unsealed, the injection of liquid is stopped, and the hollow tube is pulled outward along the working well to discharge the liquid in the cavity, and the cava member is reset under the action of the rebound member, so that the packer can be quickly unsealed and easily recovered to avoid well jamming accidents.

[0045] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0046] Reference Figure 1 As shown, the present application provides a highly sealing recoverable anchor packer, comprising a hollow tube 1, a plugging member 2, an expansion tube 3, a drive tube 4 and at least one slip assembly 5, and a first limiting ring 11 and a second limiting ring 12 are arranged on the outer side of the hollow tube 1.

[0047] The blocking member 2 is used to block the opening of the hollow tube 1 close to the first limiting ring 11 .

[0048] The expansion cylinder 3 is sleeved on the outside of the hollow tube 1 and is located between the first limiting ring 11 and the second limiting ring 12 .

[0049] The driving cylinder 4 is slidably sleeved on the outside of the first limiting ring 11 , and the side of the driving cylinder 4 facing the hollow tube 1 , the side wall of the first limiting ring 11 and the outer wall of the hollow tube 1 form a cavity 13 , which is communicated with the hollow tube 1 .

[0050] The slip assembly 5 includes a rebound member 51, a slip member 52 and an oblique body 53 slidably disposed between the first limiting ring 11 and the second limiting ring 12, the slip member 52 is connected to the oblique body 53, the oblique body 53 abuts against the expansion cylinder 3, and the two ends of the rebound member 51 are respectively connected to the slip member 52 and the hollow tube 1.

[0051] The inclined body 53 is configured to squeeze the expansion cylinder 3 so that the slip member 52 is expanded along the inclined body 53 when the liquid enters the cavity 13 through the hollow tube 1 to drive the driving cylinder 4 to move toward the second limiting ring 12;

[0052] The resilient member 51 is configured to drive the slip member 52 to reset when the hollow tube 1 moves outward along the working well to discharge the liquid in the cavity 13 .

[0053] Specifically, refer to Figure 1 and Figure 2As shown, the opening of the hollow tube 1 close to the first limiting ring 11 is the liquid outlet opening, and the opening of the hollow tube 1 close to the second limiting ring 12 is the liquid inlet opening. After the packer is lowered into the well and reaches the specified position, the liquid outlet opening is blocked by the plugging member 2, and liquid is injected into the hollow tube 1 from the liquid inlet opening, and part of the liquid can enter the cavity 13 formed by the driving cylinder 4, the first limiting ring 11 and the hollow tube 1 from the hollow tube 1. As the hydraulic pressure in the cavity 13 increases, the driving cylinder 4 can slide along the axial direction of the hollow tube 1 toward the second limiting ring 12, and thereby drive the slip member 52 and the inclined body 53 to slide toward the second limiting ring 12. Under the action of the driving cylinder 4, the inclined body 53 squeezes the expansion cylinder 3 so that the expansion cylinder 3 expands radially to the well wall to achieve sealing between the packer and the well wall; and the slip expands outward along the inclined body 53 so that the slip is embedded in the well wall, so that the packer is set. At the same time, the slips will gradually stretch the resilient member 51 during the movement relative to the hollow pipe 1. After the packer is set, the resilient member 51 is in an energy storage state. Then, the plugging member 2 is released from the liquid outlet opening to allow the hollow pipe 1 to be unblocked with the external pipeline.

[0054] When the packer is unsealed, the injection is stopped, and the hollow tube 1 is pulled outward along the working well. The hollow tube 1 moves relative to the driving cylinder 4, the volume of the cavity 13 gradually decreases, and the liquid in the cavity 13 is discharged, and the driving cylinder 4 gradually reduces the force on the slip assembly 5 and the expansion cylinder 3. Under the action of the rebound member 51, the slip member 52 is quickly reset, the expansion cylinder 3 shrinks, and the packer is unsealed to avoid the occurrence of a well stuck accident.

[0055] It can be understood that the expansion tube 3 is squeezed by the inclined body 53 so that the expansion tube 3 expands radially and clings to the well wall of the working well, thereby improving the sealing performance between the packer and the well wall.

[0056] It is understandable that both ends of the hollow tube 1 may be threadedly connected with external joints or drill rods, respectively, to facilitate the injection of liquid into the hollow tube 1 .

[0057] Further, refer to Figure 1 and Figure 2 As shown, the plugging member 2 can be a small ball, and the inner diameter of the liquid outlet opening gradually decreases from the hollow tube 1 to the outside, and the small ball enters the hollow tube 1 from the liquid inlet opening and is stuck at the liquid outlet opening. After the packer is set through the slip assembly 5, as the hydraulic pressure in the hollow tube 1 increases, the small ball breaks through the liquid outlet opening to make the hollow tube 1 unobstructed with the external pipeline.

[0058] Furthermore, the expansion cylinder 3 may be a rubber cylinder commonly used in the art, which is not limited here.

[0059] Furthermore, the resilient member 51 may be a spring.

[0060] In some embodiments, the cavity 13 formed by the driving cylinder 4, the first limiting ring 11 and the hollow tube 1 is an annular structure, so that the driving cylinder 4 has sufficient power to drive the slip member 52 and the inclined body 53 to move.

[0061] In some embodiments, reference Figure 1 and Figure 2 As shown, a mounting groove is provided on the outer wall of the hollow tube 1, and a resilient member 51 is fixed in the mounting groove, and one end of the resilient member 51 away from the mounting groove is connected to a slip member 52. The resilient member 51 is installed in the mounting groove to ensure that the slip member 52 is in a retracted state before the packer is set, and to avoid interference with the movement of the slip member 52.

[0062] Further, refer to Figure 1 and Figure 2 As shown, a plurality of resilient members 51 may be provided, and the plurality of resilient members 51 are arranged along the circumference of the hollow tube 1 to provide sufficient resilient force for the slip member 52. Of course, it is understandable that a plurality of mounting grooves may also be provided, and the plurality of resilient members 51 are arranged in a one-to-one correspondence in the plurality of mounting grooves.

[0063] In some embodiments, reference Figure 1 and Figure 2 As shown, the packer may have only one slip assembly 5, which is located between the first limiting ring 11 and the expansion cylinder 3, the slip member 52 is connected to the driving cylinder 4, the inclined body 53 abuts against the expansion cylinder 3, and the driving cylinder 4 pushes the slip member 52 and the inclined body 53 to move.

[0064] In some embodiments, reference Figures 1 to 4 As shown, the packer may include two slip assemblies 5 , which are respectively located on both sides of the expansion cylinder 3 , and each slip member 52 is connected to the corresponding inclined body 53 through a first shear member 61 .

[0065] Furthermore, in the cava assembly 5 located between the expansion cylinder 3 and the first limiting ring 11, the cava member 52 is connected to the driving cylinder 4, and the bevel 53 abuts against the expansion cylinder 3; in the cava assembly 5 located between the expansion cylinder 3 and the second limiting ring 12, the cava member 52 abuts against the second limiting ring 12, and the bevel 53 abuts against the expansion cylinder 3.

[0066] By arranging the slip assemblies 5 on both sides of the expansion cylinder 3, when the packer is set, the slip members 52 in the two slip assemblies 5 are respectively embedded in the well wall, so that the packer is bidirectionally anchored, ensuring the stability of the packer setting. When the packer is released, the rebound members 51 in the two slip assemblies 5 quickly reset the corresponding slip members 52.

[0067] When the existing packer is used in a highly deviated well or a horizontal well, during the process of running into the well, the packer is subjected to complex forces, and the slip assembly 5 is easily subjected to forces, resulting in the slip member 52 being set midway.

[0068] Further, refer to Figure 1 and Figure 3 As shown, the slip portion of each slip member 52 is connected to the inclined surface of the corresponding inclined body 53 through a first shear member 61. The first shear member 61 is mainly used to limit the relative movement between the slip member 52 and the inclined body 53 when the packer is lowered into the well, so as to prevent the packer from slipping during the process. As the hydraulic pressure in the hollow pipe 1 and the cavity 13 increases, the first shear member 61 is sheared under the action of the driving cylinder 4, so that the slip member 52 can be deployed along the inclined surface of the inclined body 53 to set the packer.

[0069] Exemplarily, the first shearing member 61 may be a shearing pin.

[0070] In some embodiments, reference Figure 1 and Figure 2 As shown, the driving cylinder 4 is connected to the hollow tube 1 via a second shearing piece 62 , and the shearing strength of the second shearing piece 62 is smaller than the shearing strength of the first shearing piece 61 .

[0071] The second shear member 62 is mainly used to limit the relative movement between the driving cylinder 4 and the hollow pipe 1, so as to prevent the driving cylinder 4 from being forced to move relative to the hollow pipe 1 when the packer is lowered into the well, and push the slip assembly 5, so that the expansion cylinder 3 expands in advance under the pressure of the slip assembly 5, so that the expanded expansion cylinder 3 rubs against the well wall and is damaged. At the same time, it can also prevent the packer from slipping in the middle of the journey.

[0072] Furthermore, the shear strength of the second shear piece 62 is smaller than the shear strength of the first shear piece 61. After the hollow tube 1 is filled with liquid, the hydraulic pressure in the cavity 13 increases, and the first shear piece is sheared first by the force, so that the driving cylinder 4 moves relative to the hollow tube 1; then, as the hydraulic pressure in the cavity 13 increases, the second shear piece 62 is sheared by the force, so that the bevel 53 squeezes the expansion cylinder 3, and the cava piece 52 unfolds along the bevel 53.

[0073] Exemplarily, the second shear member 62 may also be a shear pin.

[0074] In some embodiments, the shear strength of the first shear member 61 close to the first limiting ring 11 is greater than the shear strength of the first shear member 61 close to the second limiting ring 12 .

[0075] It can be understood that the two first shear members 61 are cut off successively, so that the cava member 52 near the second limiting ring 12 is first expanded along its corresponding bevel 53, and the packer is initially sealed, and finally the cava member 52 near the first limiting ring 11 is expanded along its corresponding bevel 53, and the packer is completely sealed.

[0076] Furthermore, the shear strength of the second shear piece 62 is smaller than the shear strength of the first shear piece 61 , and the shear strength of the first shear piece 61 close to the first limiting ring 11 is greater than the shear strength of the first shear piece 61 close to the second limiting ring 12 .

[0077] Reference Figures 1 to 4 As shown, after the hollow tube 1 is filled with liquid, the hydraulic pressure in the cavity 13 increases, and the first shear piece is sheared first by the force, so that the driving cylinder 4 moves relative to the hollow tube 1; as the hydraulic pressure in the cavity 13 increases, under the action of the driving cylinder 4, the first shear piece 61 close to the second limiting ring 12 is sheared, so that the cava piece 52 close to the second limiting ring 12 is unfolded along the inclined surface of its corresponding bevel 53, and the packer is initially sealed; then, under the action of the driving cylinder 4, the cava piece 52 and the bevel 53 close to the first limiting ring 11 move toward the second limiting ring 12, and the expansion cylinder 3 is squeezed by the bevel 53, so that the expansion cylinder 3 expands radially to the well wall, so as to achieve sealing between the packer and the well wall; finally, as the hydraulic pressure in the cavity 13 increases, the first shear piece 61 close to the first limiting ring 11 is sheared, so that the cava piece 52 close to the first limiting ring 11 is unfolded along the inclined surface of its corresponding bevel 53, and the packer is sealed.

[0078] The highly sealable recyclable anchored packer provided by the present application adopts an integrated structure with a simple overall structure. Through the arrangement of the second shearing piece 62 and the two first shearing pieces 61, it is possible to prevent the slip piece 52 from being unfolded along the inclined body 53 midway and the expansion tube 3 from expanding in the middle of the way, so as to prevent the packer from being set midway when lowered into the well; and under the action of hydraulic pressure, the second shearing piece 62 and the two first shearing pieces 61 are sheared off in sequence, so that the packer is bidirectionally anchored and set in the working well. After replacing the corresponding second shearing piece 62 and the two first shearing pieces 61, the packer can be reused.

[0079] In some embodiments, reference Figure 1 and Figure 2 As shown, the driving cylinder 4 includes a shell 41, a driving block 42 and a slider 43. The shell 41 is slidably mounted on the outside of the first limiting ring 11, and one end of the shell 41 away from the first limiting ring 11 is connected to the slip assembly 5 close to the first limiting ring 11.

[0080] The driving block 42 and the slider 43 are both slidably disposed between the outer shell 41 and the hollow tube 1. The outer shell 41, the first limiting ring 11, the driving block 42 and the hollow tube 1 surround a cavity 13. The slider 43 abuts against one end of the outer shell 41 away from the first limiting ring 11. The second shear piece 62 connects the driving block 42, the slider 43 and the hollow tube 1 in sequence.

[0081] As the hydraulic pressure in the cavity 13 increases, the drive block 42 moves along the axial direction of the hollow tube 1 toward the second limit ring 12, shearing the second shear piece 62 between the drive block 42 and the slider 43, and pushing the slider 43 and the housing 41 to move, and the housing 41 drives the cava assembly 5 to move.

[0082] Furthermore, sealing rings are provided between the driving block 42 and the housing 41 , between the driving block 42 and the hollow tube 1 , and between the housing 41 and the first limiting ring 11 to prevent liquid leakage from the cavity 13 .

[0083] In some embodiments, reference Figure 1 , Figure 2 and Figure 4 As shown, the slip assembly 5 further includes a restraint sleeve 54, which is slidably sleeved on the outside of the hollow tube 1, and the restraint sleeve 54 and the hollow tube 1 are surrounded to form a mounting cavity, the slip member 52 is disposed in the mounting cavity and connected to the restraint sleeve 54, and the slip portion of the slip member 52 extends out of the mounting cavity and is connected to the inclined surface of the inclined body 53. The restraint sleeve 54 is mainly used to restrain the expansion degree of the slip member 52 to prevent the slip member 52 and the resilient member 51 from being damaged.

[0084] In some embodiments, reference Figure 1 and Figure 4 As shown, an expansion ring 71 and a top ring 72 are also sleeved on the outside of the hollow tube 1. The expansion ring 71 abuts against the side of the second limiting ring 12 facing the first limiting ring 11, the top ring 72 is connected to the cava assembly 5 close to the second limiting ring 12, and the top ring 72 abuts against the side of the expansion ring 71 away from the second limiting ring 12.

[0085] Since the cava piece 52 in the cava assembly 5 is limited to the inclined surface of the inclined body 53 by the first shear piece 61, when the driving cylinder 4 moves, it will drive the cava piece 52, the inclined body 53 and the expansion cylinder 3 to move toward the second limiting ring 12, and squeeze the expansion ring 71 through the abutment ring 72, so that the expansion ring 71 radially expands and contacts the well wall to form a preliminary seal, so as to prevent debris from falling during subsequent work and affecting the work of the expansion cylinder 3 and the cava assembly 5.

[0086] Exemplarily, the expansion ring 71 may be a rubber ring.

[0087] Further, refer to Figure 1 , Figure 2 and Figure 4 As shown, the slip assembly 5 further includes a slip ring 55, one end of which is threadedly connected to the constraint sleeve 54, a limiting groove is provided on the outer side of the hollow tube 1, and the slip ring 55 is sleeved in the limiting groove, and the slip ring 55 can slide in the limiting groove along the axial direction of the hollow tube 1. Among them, the slip ring 55 close to the first limiting ring 11 is threadedly connected to the housing 41, and the slip ring 55 close to the second limiting ring 12 is threadedly connected to the top ring 72.

[0088] The slip ring 55 and the limiting groove are used to restrict the movement distance of the slip member 52 along the hollow pipe 1 to reduce damage.

[0089] Further, refer to Figure 1 and Figure 4 As shown, a convex ring is arranged between the first limiting ring 11 and the second limiting ring 12 , the convex ring is close to the second limiting ring 12 , the top ring 72 is slidably arranged between the convex ring and the second limiting ring 12 , and the expansion ring 71 is clamped between the top ring 72 and the second limiting ring 12 .

[0090] In some embodiments, reference Figure 3 and Figure 5 As shown, at least two layers of protective members 8 are provided between the inclined body 53 and the expansion cylinder 3. By providing at least two layers of protective members 8, when the inclined body 53 pressurizes the expansion cylinder 3, the expansion cylinder 3 is constrained from deforming, thereby preventing the expansion cylinder 3 from "shoulder protrusion" from occurring.

[0091] Furthermore, the adjacent protective members 8 on both sides are fixed by welding points, and the multi-layer protective member 8 structure can constrain the deformation of the expansion cylinder 3 under different loads. When the load is small, the shape of the protective member 8 remains unchanged; when the load increases, the welding points of the first layer of the protective member 8 (the first layer close to the bevel 53) are disconnected, and the thin sheets of the first layer of the protective member 8 are opened. When the load continues to increase, the thin sheets of the second layer of the protective member 8 are opened, and so on. The structural design of the protective member 8 can not only reduce the occurrence of the "shoulder protrusion" phenomenon of the expansion cylinder 3, but also constrain the deformation of the expansion cylinder 3 under different load conditions.

[0092] Specifically, the multi-layer protective member 8 is threadedly connected to one end of the inclined body 53 close to the expansion cylinder 3 .

[0093] In some embodiments, reference Figure 1 and Figure 3 As shown, the expansion tube 3 includes a plurality of expansion members 31 slidably sleeved on the outside of the hollow tube 1 , two adjacent expansion members 31 are separated by a spacer ring 32 , and the two oblique bodies 53 are respectively connected to the corresponding expansion members 31 .

[0094] The sealing performance of the packer can be further improved by providing multiple expansion members 31. At the same time, compared with a single rubber sleeve, when the packer is lowered into the well and inevitably rubs against the well wall, it can ensure that at least one expansion member 31 is not damaged, so that the packer can achieve a sealing effect.

[0095] For example, refer to Figure 1 and Figure 3 As shown, the expansion cylinder 3 includes three expansion members 31. The expansion members 31 can be rubber cylinders.

[0096] Further, refer to Figure 6As shown, the multiple expansion members 31 all adopt a semicircular shape structure, which can further improve the contact force with the well wall compared to the conventional rubber sleeve, thereby improving the sealing performance of the packer.

[0097] Further, refer to Figure 6 As shown, the outer surfaces of the plurality of expansion members 31 are all concave-convex surfaces to increase the contact force with the well wall.

[0098] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0099] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A highly sealable retrievable anchor packer, characterized in that: include: A hollow tube, with a first limiting ring and a second limiting ring disposed on the outer side thereof; A blocking member, used for blocking an opening of the hollow tube close to the first limiting ring; An expansion cylinder, sleeved on the outer side of the hollow tube and located between the first limiting ring and the second limiting ring; A driving cylinder is slidably sleeved on the outer side of the first limiting ring, and a side of the driving cylinder facing the hollow tube, a side wall of the first limiting ring and an outer wall of the hollow tube form a cavity, and the cavity is communicated with the hollow tube; A slip assembly, comprising a resilient member, a slip member and an italic body slidably disposed between the first limiting ring and the second limiting ring, the slip member being connected to the italic body, the italic body being in contact with the expansion cylinder, and two ends of the resilient member being respectively connected to the slip member and the hollow tube; The inclined body is configured to squeeze the expansion cylinder to expand the slip member along the inclined body when liquid enters the cavity through the hollow tube to drive the driving cylinder to move toward the second limiting ring; The resilient member is configured to drive the slip member to reset when the hollow tube moves outward along the working well to discharge the liquid in the cavity; There are two slip assemblies, which are respectively located on both sides of the expansion cylinder, and each slip assembly is connected to the corresponding iterative body through a first shear member; The driving cylinder is connected to the hollow tube via a second shearing member, and the shearing strength of the second shearing member is smaller than the shearing strength of the first shearing member.

2. The packer according to claim 1, characterized in that: An installation groove is arranged on the outer wall of the hollow tube, the resilient member is fixed in the installation groove, and one end of the resilient member away from the installation groove is connected to the slip member.

3. The packer according to claim 1, characterized in that: The shear strength of the first shear member close to the first limiting ring is greater than the shear strength of the first shear member close to the second limiting ring.

4. The packer according to claim 1, characterized in that: The driving cylinder comprises a housing, a driving block and a sliding block, wherein the housing is slidably sleeved on the outer side of the first limiting ring, and an end of the housing away from the first limiting ring is connected to the slip assembly close to the first limiting ring; The driving block and the slider are both slidably disposed between the outer shell and the hollow tube. The outer shell, the first limiting ring, the driving block and the hollow tube surround the cavity. The slider abuts against one end of the outer shell away from the first limiting ring. The second shear piece sequentially connects the driving block, the slider and the hollow tube.

5. The packer according to claim 1, characterized in that: The cava assembly also includes a restraint sleeve, which is slidably mounted on the outside of the hollow tube. The restraint sleeve and the hollow tube form an installation cavity. The cava member is arranged in the installation cavity and connected to the restraint sleeve. The cava part of the cava member extends out of the installation cavity and is connected to the inclined surface of the bevel.

6. The packer according to claim 1, characterized in that: An expansion ring and a top ring are also sleeved on the outside of the hollow tube. The expansion ring abuts against the side of the second limiting ring facing the first limiting ring, the top ring is connected to the cava assembly close to the second limiting ring, and the top ring abuts against the side of the expansion ring away from the second limiting ring.

7. The packer according to claim 1, characterized in that: At least two layers of protective parts are arranged between the inclined body and the expansion cylinder.

8. The packer according to claim 7, characterized in that: The expansion cylinder comprises a plurality of expansion pieces which are slidably sleeved on the outer side of the hollow tube, two adjacent expansion pieces are separated by a spacer ring, and the two italics are respectively connected to the corresponding expansion pieces.

Images