Anchoring packer

Abstract

The invention belongs to the technical field of downhole tools, and particularly relates to an anchoring packer. The anchoring packer comprises a central pipe, a limiting ring is arranged on the outer side of the central pipe, and a pressure transmitting hole is formed in the side wall of the central pipe; the cylinder body assembly is arranged on the outer side of the central pipe, and the pressure transmitting hole is constructed to be capable of transmitting pressure in the central pipe to the cylinder body assembly, so that the cylinder body assembly moves towards the direction of the limiting ring; the rubber sleeve assembly and the anchoring assembly are arranged on the outer side of the central pipe and are in mutual axial contact, and the rubber sleeve assembly and the anchoring assembly are located between the limiting ring and the cylinder body assembly; and the elastic piece is arranged between the anchoring assembly and the central pipe, and the elastic piece is configured to provide reset force for the anchoring assembly after sitting and hanging during recovery.

Description

Technical Field

[0001] The invention belongs to the technical field of downhole tools, and in particular relates to an anchor packer. Background Art

[0002] The packer mainly plays the role of sealing the annulus between the oil casing and the casing. It 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. The working principle of the packer is to expand the rubber tube to the casing through hydraulic drive, which plays the role of sealing the annulus between the oil casing and the casing. The conventional recoverable packer has a weak mid-seating ability. During the downhole process of high-angle wells or horizontal wells, the force on the pipe string is complex, and it is very easy to apply force to the packer slips, causing the slips to be set midway. At the same time, conventional packers are not suitable for ultra-deep wells or horizontal wells, have low pressure bearing capacity, and cannot be quickly unsealed due to their complex structure. During the unsealing process of the packer, since the slips are embedded in the casing, it is difficult to recover them if they are not subjected to the recovery force.

[0003] Therefore, in order to solve the above technical problems, it is urgent to develop a packer. Summary of the invention

[0004] In view of the technical problems mentioned above, the present invention aims to provide an anchor packer which can solve the problem of recovery difficulties.

[0005] According to the present invention, there is provided an anchor packer, comprising:

[0006] A central tube, a limiting ring is arranged on the outer side of the central tube, and a pressure transmission hole is arranged on the side wall of the central tube;

[0007] A cylinder assembly is arranged outside the central tube, and the pressure transmission hole is configured to transmit the pressure inside the central tube to the cylinder assembly, so that the cylinder assembly moves toward the direction of the limiting ring;

[0008] A rubber cartridge assembly and an anchor assembly are disposed on the outer side of the central tube and are in axial contact with each other, wherein the rubber cartridge assembly and the anchor assembly are located between the stop ring and the cylinder assembly; and

[0009] An elastic member is arranged between the anchor assembly and the central pipe, and the elastic member is configured to provide a restoring force for the anchor assembly after being set during recovery.

[0010] In a specific embodiment, the anchor assembly comprises:

[0011] A cone disposed at an axial end of the cartridge assembly; and

[0012] Slips, the ends of the slips are connected to the cone through an inclined surface;

[0013] A groove is arranged on the outer wall of the central tube, the elastic member is arranged in the groove, and two ends of the elastic member are respectively connected to the slips and the central tube.

[0014] In a specific embodiment, the slips are connected to the cone via shear pins.

[0015] In a specific embodiment, the anchoring assembly also includes a restraining sleeve, the cone includes a conical section, a cylindrical section and a limiting section coaxially arranged in sequence, the conical section is axially abutted against the rubber sleeve assembly, the cava is coaxially arranged on the outside of the cylindrical section, and the axial ends of the end of the restraining sleeve are axially abutted against the cava and the limiting section respectively.

[0016] In a specific embodiment, a through hole is provided on the cylindrical section, and the elastic member passes through the through hole, so that two ends of the elastic member are respectively connected to the slip and the central pipe.

[0017] In a specific embodiment, the anchoring assembly further includes a slip ring, which is connected to the constraint sleeve, and a limiting member capable of matching with the limiting section and the limiting ring is arranged on the inner side of the slip ring.

[0018] In a specific embodiment, anchoring assemblies are provided at both the upper and lower ends of the rubber cylinder assembly.

[0019] In a specific embodiment, the rubber cartridge assembly and the anchor assembly are axially movably arranged on the center tube, and an elastic ring and a first fixed ring are also arranged on the center tube. The first fixed ring is fixedly arranged on the outside of the center tube, and the elastic ring is located between the first fixed ring and the anchor assembly. The anchor assembly can compress the elastic ring when it moves upward relative to the center tube.

[0020] In a specific embodiment, a top ring is arranged on the outer side of the central tube, and two ends of the top ring are respectively connected to the elastic ring and the anchor assembly.

[0021] In a specific embodiment, the cylinder assembly includes:

[0022] A second fixing ring fixedly arranged on the outside of the central tube;

[0023] A hydraulic cylinder coaxially and movably arranged outside the central tube;

[0024] a drive block disposed between the hydraulic cylinder and the central tube;

[0025] An annulus is formed between the second fixing ring, the liquid cylinder and the driving block, and the annulus is communicated with the pressure transmission hole.

[0026] Compared with the prior art, the advantages of the present application are as follows.

[0027] The present invention provides an anchor packer, which mainly includes a central tube, a rubber tube assembly, an anchor assembly and a cylinder assembly. An elastic member is arranged between the central tube and the anchor assembly. When the anchor packer needs to be recovered, the elastic member can provide a restoring force for the anchor assembly, so that the anchor assembly can be quickly reset, thereby contacting the anchor between the downhole casing and realizing the rapid recovery of the anchor packer.

[0028] The present invention is also provided with an elastic ring. When the anchor packer is set, the anchor assembly and the rubber cartridge assembly will approach the elastic ring and axially squeeze the elastic ring, so that the elastic ring radially expands to contact the downhole casing, thereby preventing debris in the well from entering between the outer wall of the central pipe and the inner wall of the downhole casing, preventing debris from jamming the anchor assembly or the rubber cartridge assembly, and thus facilitating the recovery of the anchor packer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described below with reference to the accompanying drawings.

[0030] Figure 1 A schematic diagram showing an anchor packer provided according to the present invention in a first state;

[0031] Figure 2 A schematic diagram showing an anchor packer provided according to the present invention in a second state;

[0032] Figure 3 Shows Figure 1 An enlarged schematic diagram of part A.

[0033] The reference numerals in the figures are as follows:

[0034] 1. Center tube; 11. Limiting ring; 12. Pressure transmission hole; 13. Groove;

[0035] 2. Rubber cylinder assembly; 21. First shoulder guard; 22. First rubber cylinder; 23. First spacer ring; 24. Middle rubber cylinder; 25. Second spacer ring; 26. Second rubber cylinder; 27. Second shoulder guard;

[0036] 3. Anchor assembly; 31. First cone; 311. Cylindrical section; 312. Conical section; 313. Limiting section; 314. Through hole; 32. First slip; 33. First shear pin; 34. Second cone; 35. Second slip; 36. Second shear pin; 37. First restraint sleeve; 371. First slip ring; 372. First limiting member; 38. Second restraint sleeve; 381. Second slip ring; 382. Second limiting member;

[0037] 4. Cylinder assembly; 41. Second fixing ring; 42. Liquid cylinder; 43. Driving block; 44. Sliding block; 45. Third shear pin;

[0038] 5. Elastic parts;

[0039] 61. elastic ring; 62. first fixing ring; 63. top ring; 631. third limiting member;

[0040] 71. Upper joint; 72. Lower joint; 73. Sealing ball;

[0041] 100. Anchor the packer.

[0042] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0043] The present invention will be described below with reference to the accompanying drawings.

[0044] It should be noted that, in the present application, the direction of the anchor packer provided according to the present invention after entering the well near the wellhead is described as "up" or similar terms, that is, Figure 1 The direction away from the wellhead after the anchor packer provided by the present invention is placed in the well is described as "downward" or similar terms, that is, Figure 1 Below.

[0045] Figure 1 The structure of the anchor packer 100 according to the present invention is shown. Figure 1 As shown, the anchor packer 100 mainly includes a central pipe 1, a cylinder assembly 4, a rubber cartridge assembly 2 and an anchor assembly 3.

[0046] A limit ring 11 is provided on the outer side of the center tube 1, and a pressure transmission hole 12 is provided on the side wall of the center tube 1. The cylinder assembly 4 is coaxially sleeved on the outer side of the center tube 1, and the pressure transmission hole 12 can transmit the pressure inside the center tube 1 to the cylinder assembly 4, so that the cylinder assembly 4 moves in the direction of the limit ring 11. The rubber cartridge assembly 2 and the anchor assembly 3 are both coaxially sleeved on the outer side of the center tube 1, and the two are in axial contact with each other, and the rubber cartridge assembly 2 and the anchor assembly 3 are located between the limit ring 11 and the cylinder assembly 4. Under this setting, the cylinder assembly 4 can be moved in the direction of the limit ring 11 by pressurizing the inner cavity of the center tube 1, thereby axially squeezing the rubber cartridge assembly 2 and the anchor assembly 3, causing the rubber cartridge assembly 2 and the anchor assembly 3 to expand radially, and completing the sealing and hanging.

[0047] According to the present invention, an elastic member 5 is provided between the anchor assembly 3 and the central pipe 1, and the elastic member 5 is capable of providing a reset force for the anchor assembly 3 after setting when it is recovered. Under this arrangement, when it is necessary to recover the anchor packer 100, the elastic member 5 can provide the anchor assembly 3 with the force required for reset, thereby facilitating the anchor assembly 3 to be released from setting, and then the rubber cartridge assembly 2 to be released from setting, and the recovery of the anchor packer 100 is completed.

[0048] In a specific embodiment, the central tube 1 is generally cylindrical in shape. The limiting ring 11 is coaxially fixedly arranged on the outer wall of the central tube 1. In this embodiment, the limiting ring 11 and the central tube 1 are arranged in an integrated structure.

[0049] A groove 13 is provided on the outer wall of the central tube 1 at a position corresponding to the anchor assembly 3, and the elastic member 5 is arranged in the groove 13. In this embodiment, the elastic member 5 is arranged as a spring.

[0050] In the first state, if Figure 1 As shown, the central axis of the elastic member 5 is in a horizontal state, that is, the central axis of the elastic member 5 is arranged along the radial direction of the central tube 1, and the two ends of the elastic member 5 are fixedly connected to the central tube 1 and the anchor assembly 3 respectively.

[0051] In the second state, if Figure 2 As shown, at this time, the cylinder assembly 4 presses the anchor assembly 3 and the rubber cartridge assembly 2 upward, so that the anchor assembly 3 and the rubber cartridge assembly 2 move upward, and finally completes the setting and hanging, and the elastic member 5 becomes inclined. At this time, the elastic member 5 is stretched, so the elastic member 5 will have a pre-tightening force, and the pre-tightening force of the elastic member 5 can provide a reset force for the anchor assembly 3 when the anchor packer 100 is recovered later.

[0052] It should be noted that the elastic member 5 of the present invention is not limited to a spring, and any structure that can provide force for the anchoring assembly 3 should be within the protection scope of the present invention.

[0053] According to the present invention, in a specific embodiment, two anchoring assemblies 3 are respectively arranged on the upper and lower sides of the rubber cartridge assembly 2, and the two anchoring assemblies 3 have the same structure. The two anchoring assemblies 3 are arranged symmetrically up and down with the rubber cartridge assembly 2 as the symmetry center. The anchoring assemblies 3 mainly include slips and cones.

[0054] First, the structure of the anchor assembly 3 located above the rubber cartridge assembly 2 is described. The anchor assembly 3 mainly includes a first cone 31 and a first slip 32 .

[0055] In this embodiment, the first cone 31 includes a conical section 312, a cylindrical section 311 and a limiting section 313 which are coaxially arranged in sequence. The lower end of the conical section 312 is in axial contact with the upper end of the rubber cartridge assembly 2. Among them, the inner diameters of the conical section 312, the cylindrical section 311 and the limiting section 313 are the same, and the outer diameter of the cylindrical section 311 is smaller than the outer diameters of the conical section 312 and the limiting section 313. The outer diameter of the conical section 312 is configured to gradually increase from the cylindrical section 311 to the rubber cartridge assembly 2, so that the conical section 312 is configured to be conical. The first slip 32 is coaxially arranged on the outside of the cylindrical section 311. The inner wall of one end of the first slip 32 is configured to be a cone adapted to the outer wall of the conical section 312. When the two are close to each other, the first slip 32 can expand radially under the action of the conical section 312 to complete the hanging. The other end of the first slip 32 is in axial contact with the limiting section 313 of the first cone 31 through a first constraint sleeve 37 (the structure of the first constraint sleeve 37 is described below in detail).

[0056] In a preferred embodiment, the first slip 32 is fixedly connected to the conical section 312 of the first cone 31 through the first shear pin 33. With this arrangement, it is possible to avoid providing the shear pin 33 on the central pipe 1, thereby enhancing the strength of the central pipe 1.

[0057] Furthermore, since the cylindrical section 311 of the first cone 31 in this embodiment is located between the first cava 32 and the center tube 1, a through hole 314 is radially arranged on the cylindrical section 311 of the first cone 31 in this embodiment, and the elastic member 5 passes through the through hole 314, so that the two ends of the elastic member 5 are respectively connected to the cava and the center tube 1.

[0058] In this embodiment, if Figure 1 As shown, the first constraint sleeve 37 is coaxially sleeved on the outer side of the central tube 1. The first constraint sleeve 37 is configured to have a small inner diameter at the lower part and a large inner diameter at the upper part, that is, the upper part of the first constraint sleeve 37 is a large diameter part and the lower part is a small diameter part. The small diameter part of the lower end of the first constraint sleeve 37 is located between the first slip 32 and the limiting section 313, and the upper and lower ends of the small diameter part of the first constraint sleeve 37 are axially in contact with the limiting section 313 and the first slip 32, respectively.

[0059] A first slip ring 371 and a top ring 63 are coaxially arranged on the outer side of the central tube 1. The lower end of the first slip ring 371 is fixedly connected to the large diameter portion of the upper end of the first constraint sleeve 37 by threaded connection. The lower end of the top ring 63 is fixedly connected to the lower end of the first slip ring 371 by threaded connection, and a third stopper 631 is arranged on the inner wall of the top ring 63. The third stopper 631 is located above the stopper ring 11, and the third stopper 631 can abut against the stopper ring 11 axially.

[0060] Furthermore, a first stopper 372 is provided on the inner wall of the first sliding ring 371, and the first stopper 372 can axially contact with the stopper ring 11. In the first state, an axial gap exists between the first stopper 372 and the stopper section 313 of the first cone 31.

[0061] The anchor assembly 3 located above the rubber cartridge assembly 2 is described below. Under the above arrangement, when the anchor packer 100 needs to be set, that is, the anchor packer 100 is moved from Figure 1 The first state shown is converted to Figure 2 In the second state shown, a sealing ball 73 is inserted into the lower end of the inner cavity of the central tube 1 for sealing, and then the central tube 1 is pressurized, and the pressure in the central tube 1 is transmitted to the cylinder assembly 4 through the pressure transmission hole 12, pushing the cylinder assembly 4 to move upward, and then pushing the anchor assembly 3 and the rubber cylinder assembly 2 to move upward, until the anchor assembly 3 located above the rubber cylinder assembly 2 moves to the first limiter 372 of the first slip ring 371 and axially abuts against the limiter ring 11 of the central tube 1. Continue to pressurize the central tube 1, the cylinder assembly 4 continues to move upward, and the first cone 31 of the anchor assembly 3 is pushed upward by the rubber cylinder assembly 2 to continue to move upward relative to the central tube 1. Since the first slip ring 371 can no longer move upward relative to the central tube 1 at this time, and the lower end of the first slip ring 371 is axially abutted against the first slip 32 through the first constraint sleeve 37, the first cone 31 will move upward relative to the first slip 32, so that the first slip 32 expands radially and anchors on the inner wall of the downhole casing to complete the hanging. At the same time, the rubber cartridge assembly 2 is also compressed axially and expanded radially to complete the sealing.

[0062] When it is necessary to recover the anchor packer 100, that is, to remove the anchor packer 100 from the Figure 2 The second state shown is converted to Figure 1 In the first state shown, first stop pressurizing the center pipe 1, then lift the center pipe 1, when the limit ring 11 of the center pipe 1 abuts the third limit piece 631 of the top ring 63, the center pipe 1 can drive the top ring 63, the first sliding ring 371, and the first constraint sleeve 37 to move upward relative to the first slip 32 and the first cone 31. In the process of the first constraint sleeve 37 moving to the limit section 313 abutting the first cone 31, on the one hand, there will be an axial gap between the first constraint sleeve 37 and the first slip 32, and on the other hand, the elastic member 5 can pull the first slip 32 upward, so that the first slip 32 moves upward relative to the first cone 31, and the anchoring between the first slip 32 and the downhole casing is released. Continue to lift the center pipe 1, the first constraint sleeve 37 can drive the first cone 31 to move upward through the limit section 313 of the first cone 31, so that an axial gap appears between the first cone 31 and the rubber sleeve assembly 2, so that the rubber sleeve assembly 2 is no longer subjected to axial compression, thereby releasing the setting seal.

[0063] According to the present invention, in a preferred embodiment, in the first state, the first stopper 372 is located below the stopper ring 11, and there is an axial gap between the two. An elastic ring 61 and a first fixing ring 62 are also provided on the central tube 1. The first fixing ring 62 is fixedly arranged on the outer side of the central tube 1 and is located above the top ring 63. The elastic ring 61 is located between the first fixing ring 62 and the top ring 63, and the axial ends of the elastic ring 61 are fixedly connected to the first fixing ring 62 and the top ring 63 respectively.

[0064] In this setting, if Figure 2 As shown, the rubber cylinder assembly 2 and the anchor assembly 3 are axially movable on the central tube 1. When the anchor assembly 3 moves upward relative to the central tube 1, due to the axial gap between the first stopper 372 of the first slide ring 371 and the stop ring 11 of the central tube 1, the first slide ring 371 can move upward relative to the central tube 1 for a distance, thereby pushing the top ring 63 to move upward relative to the central tube 1 for a distance. In the above process, the elastic ring 61 is axially compressed and radially expanded, sealing the central tube 1 and the downhole casing, which can prevent downhole impurities from entering between the central tube 1 and the downhole casing, and prevent the impurities from blocking the first slip 32 and hindering the recovery of the anchor packer 100.

[0065] In this embodiment, the elastic ring 61 is a cylinder made of rubber material.

[0066] According to the present invention, the structure of the anchor assembly 3 below the rubber cartridge assembly 2 is the same as that of the anchor assembly 3 above the rubber cartridge assembly 2, and the two anchor assemblies 3 are symmetrical to each other. The structure of the anchor assembly 3 below the rubber cartridge assembly 2 is described below.

[0067] The anchor assembly 3 located below the rubber cartridge assembly 2 mainly includes a second cone 34 and a second slip 35. In the present embodiment, the structure of the second cone 34 is the same as that of the first cone 31, and also includes a conical section 312, a cylindrical section 311 and a limiting section 313 which are coaxially arranged in sequence. The upper end of the conical section 312 is in axial contact with the lower end of the rubber cartridge assembly 2. Among them, the inner diameters of the conical section 312, the cylindrical section 311 and the limiting section 313 are the same, and the outer diameter of the cylindrical section 311 is smaller than the outer diameters of the conical section 312 and the limiting section 313. The outer diameter of the conical section 312 is configured to gradually increase from the cylindrical section 311 to the rubber cartridge assembly 2, so that the conical section 312 is configured to be conical. The second slip 35 is coaxially arranged on the outer side of the cylindrical section 311 of the second cone 34. The inner wall of the upper end of the second slip 35 is configured as a cone that matches the outer wall of the conical section 312 of the second cone 34. When the two are close to each other, the second slip 35 can expand radially under the action of the conical section 312 to complete the hanging. The lower end of the second slip 35 is axially in contact with the limiting section 313 of the second cone 34 through the second constraint sleeve 38 (the structure of the second constraint sleeve 38 is described below).

[0068] In a preferred embodiment, the second slip 35 is fixedly connected to the conical section 312 of the second cone 34 via the second shear pin 36. With this arrangement, it is possible to avoid providing shear pins on the central pipe 1, thereby enhancing the strength of the central pipe 1.

[0069] Furthermore, since the cylindrical section 311 of the second cone 34 in this embodiment is located between the second cava 35 and the center tube 1, a through hole 314 is radially arranged on the cylindrical section 311 of the second cone 34 in this embodiment, and the elastic member 5 passes through the through hole 314, so that the two ends of the elastic member 5 are respectively connected to the second cava 35 and the center tube 1.

[0070] In this embodiment, if Figure 1 As shown, the second constraint sleeve 38 is coaxially sleeved on the outer side of the central tube 1. The second constraint sleeve 38 is configured to have a small inner diameter at the upper part and a large inner diameter at the lower part, that is, the lower part of the second constraint sleeve 38 is a large diameter part, and the upper part is a small diameter part. The small diameter part of the upper end of the second constraint sleeve 38 is located between the second slip 35 and the limiting section 313, and the upper and lower ends of the small diameter part of the second constraint sleeve 38 are axially in contact with the limiting section 313 and the second slip 35, respectively.

[0071] A second slip ring 381 is coaxially arranged on the outer side of the central tube 1. The upper end of the second slip ring 381 is fixedly connected to the large diameter portion of the lower end of the second constraint sleeve 38 by threaded connection. The lower end of the second slip ring 381 is in axial contact with the cylinder assembly 4. Further, a second stopper 382 is arranged on the inner wall of the second slip ring 381. In the first state, there is an axial gap between the second stopper 382 and the stopper section 313 of the second cone 34.

[0072] The cylinder assembly 4 mainly includes a second fixing ring 41 , a hydraulic cylinder 42 and a driving block 43 .

[0073] The second fixing ring 41 is coaxially fixedly arranged on the outer wall of the lower end of the central tube 1, and the liquid cylinder 42 is coaxially sleeved on the outer side of the central tube 1 in a movable manner, and the lower end of the liquid cylinder 42 is located radially outside the second fixing ring 41, and a sealing ring is arranged between the inner wall of the lower end of the liquid cylinder 42 and the outer wall of the second fixing ring 41. The upper end of the liquid cylinder 42 is in axial contact with the second sliding ring 381.

[0074] The driving block 43 is arranged between the inner wall of the liquid cylinder 42 and the central tube 1, and sealing rings are arranged between the driving block 43 and the liquid cylinder 42 and between the driving block 43 and the central tube 1. The driving block 43 is located above the second fixing ring 41, and the pressure transmission hole 12 of the central tube 1 is located between the driving block 43 and the second fixing ring 41.

[0075] Under this setting, the pressure in the center tube 1 can be transmitted to the annulus formed by the driving block 43, the hydraulic cylinder 42 and the second fixed ring 41 through the pressure transmission hole 12, thereby pushing the driving block 43 to move upward relative to the second fixed ring 41, and the upper end surface of the driving block 43 can axially abut the hydraulic cylinder 42, thereby pushing the hydraulic cylinder 42 to move upward relative to the center tube 1, and then pushing the second slip ring 381 to move upward relative to the center tube 1. The second slip ring 381 pushes the second slip 35 to move upward relative to the center tube 1 through the second constraint sleeve 38, thereby pushing the second cone 34, the rubber cylinder assembly 2, and the first cone 31 of the anchor assembly 3 above the rubber cylinder assembly 2 to move upward relative to the center tube 1. The movement process of the anchor assembly 3 above the rubber cylinder assembly 2 has been described in the previous text and will not be repeated here. When the anchor assembly 3 above the rubber cylinder assembly 2 completes the sealing, the hydraulic cylinder 42 continues to move upward, axially compresses the rubber cylinder assembly 2 through the second slip 35 and the second cone 34, and the rubber cylinder assembly 2 expands radially to complete the sealing. After the rubber cartridge assembly 2 is set, the second cone 34 can no longer move upward relative to the central pipe 1. At this time, the second slip 35 continues to move upward relative to the second cone 34 under the push of the hydraulic cylinder 42. The second slip 35 expands radially under the action of the conical section 312 of the second cone 34 and is anchored on the inner wall of the downhole casing to complete the setting. Figure 2 shown.

[0076] When the anchor packer 100 needs to be recovered, the pressurization into the central pipe 1 is stopped, and the central pipe 1 is lifted. Figure 2As shown, at this time, the elastic member 5 connecting the second slip 35 with the central tube 1 is in a stretched state, and after the hydraulic cylinder 42 loses the pressure from the pressure transmission hole 12, the second slip 35 can be reset under the tension of the elastic member 5, thereby contacting the second slip 35 to sit. The process of releasing the anchor assembly 3 located above the rubber cartridge assembly 2 and the process of unsealing the rubber cartridge assembly 2 have been described above and will not be repeated here.

[0077] In this embodiment, the central tube 1 is an integrated structure, which reduces the complexity of the structure. The dimensions of the outer wall of the central tube 1 between the stop ring 11 and the second fixing ring 41 are all equal except for the location where the groove 13 is set. Under this arrangement, it is beneficial for the anchor assembly 3, the rubber cartridge assembly 2 and the cylinder assembly 4 to perform axial displacement relative to the central tube 1.

[0078] In a specific embodiment, an upper joint 71 is provided at the upper end of the central pipe 1 , and a lower joint 72 is provided at the lower end.

[0079] In a specific embodiment, the rubber cylinder assembly 2 includes a first shoulder guard 21, a first rubber cylinder 22, a first spacer ring 23, a middle rubber cylinder 24, a second spacer ring 25, a second rubber cylinder 26, and a second shoulder guard 27, which are coaxially arranged from top to bottom and axially abutted against each other. The upper end of the first shoulder guard 21 is axially abutted against the first cone 31, and the lower end of the second shoulder guard 27 is axially abutted against the second cone 34.

[0080] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0083] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anchor packer, characterized in that: include: A central tube (1), a limiting ring (11) is arranged on the outer side of the central tube (1), and a pressure transmission hole (12) is arranged on the side wall of the central tube (1); A cylinder assembly (4) is arranged outside the central tube (1), and the pressure transmission hole (12) is configured to transmit the pressure inside the central tube (1) to the cylinder assembly (4), thereby causing the cylinder assembly (4) to move in the direction of the limiting ring (11); A rubber cartridge assembly (2) and an anchor assembly (3) are arranged on the outer side of the central tube (1) and are in axial contact with each other, wherein the rubber cartridge assembly (2) and the anchor assembly (3) are located between the limiting ring (11) and the cylinder assembly (4); and An elastic member (5) is arranged between the anchor assembly (3) and the central pipe (1), and the elastic member (5) is configured to provide a restoring force for the anchor assembly (3) after being set when it is retrieved.

2. The anchor packer according to claim 1, characterized in that: The anchoring assembly (3) comprises: A cone is arranged at the axial end of the rubber cartridge assembly (2); and Slips, the ends of the slips are connected to the cone through an inclined surface; A groove (13) is provided on the outer wall of the central tube (1), the elastic member (5) is arranged in the groove (13), and two ends of the elastic member (5) are respectively connected to the slip and the central tube (1).

3. The anchor packer according to claim 2, characterized in that: The slips are connected to the cone via shear pins.

4. The anchor packer according to claim 2, characterized in that: The anchoring assembly (3) also includes a restraining sleeve, the cone includes a conical section (312), a cylindrical section (311) and a limiting section (313) which are coaxially arranged in sequence, the conical section (312) is axially abutted against the rubber cartridge assembly (2), the slip is coaxially arranged on the outside of the cylindrical section (311), and the axial ends of the end of the restraining sleeve are axially abutted against the slip and the limiting section (313) respectively.

5. The anchor packer according to claim 4, characterized in that: A through hole (314) is provided on the cylindrical section (311), and the elastic member (5) passes through the through hole (314), so that the two ends of the elastic member (5) are respectively connected to the slip and the central pipe (1).

6. The anchor packer according to claim 4, characterized in that: The anchoring assembly (3) further comprises a slip ring, the slip ring being connected to the constraint sleeve, and a limiting member capable of matching with the limiting section (313) and the limiting ring (11) is arranged on the inner side of the slip ring.

7. The anchor packer according to any one of claims 1 to 6, characterized in that: Anchoring components (3) are provided at both the upper and lower ends of the rubber cylinder component (2).

8. The anchor packer according to claim 7, characterized in that: The rubber cartridge assembly (2) and the anchor assembly (3) are axially movably arranged on the central tube (1); an elastic ring (6) and a first fixing ring (62) are also arranged on the central tube (1); the first fixing ring (62) is fixedly arranged on the outer side of the central tube (1); the elastic ring (6) is located between the first fixing ring (62) and the anchor assembly (3); and the anchor assembly (3) is capable of compressing the elastic ring (6) when it moves upward relative to the central tube (1).

9. The anchor packer according to claim 8, characterized in that: A top ring (63) is arranged on the outside of the central tube (1), and two ends of the top ring (63) are respectively connected to the elastic ring (6) and the anchor assembly (3).

10. The anchor packer according to claim 7, characterized in that: The cylinder assembly (4) comprises: A second fixing ring (41) fixedly arranged on the outside of the central tube (1); A liquid cylinder (42) coaxially and movably arranged outside the central tube (1); a driving block (43) disposed between the hydraulic cylinder (42) and the central tube (1); An annulus is formed between the second fixing ring (41), the liquid cylinder (42) and the driving block (43), and the annulus is communicated with the pressure transmission hole (12).

Images