Anchoring type packer with single piston at upper end and strip-shaped slip

Abstract

The invention relates to the technical field of packers, in particular to a strip-shaped slip anchoring type packer with a single piston at the upper end, which comprises an upper joint, an outer cylinder and a packing assembly, the inner side of the lower end of the upper joint is in threaded connection with a mandrel, the lower end of the mandrel is positioned below the mandrel, and the outer side of the upper part of the upper joint corresponding to the lower position of the upper joint is sequentially sleeved with a sealing short section and a piston from top to bottom; and at least one tangent plane is arranged on the mandrel corresponding to the inner side of the lower end of the piston along the circumference. The device is reasonable and compact in structure and convenient to use, the packing assembly is arranged on the lower portion of the device for setting and preventing a pipe string from falling, the strip-shaped slip is arranged on the upper portion of the device for hydraulic anchoring and preventing the pipe string from moving upwards due to different internal and external pressures of the pipe string, and the single-piston strip-shaped slip anchoring mechanism comprehensively reduces tool dynamic sealing parts, reduces the using amount of rubber sealing rings and improves the working efficiency. The risk of sealing failure is small, and the reliability of the tool is improved.

Description

Technical Field

[0001] The invention relates to the technical field of packers, in particular to an upper end single-piston strip slip anchored packer. Background Art

[0002] At present, domestic deep-ultra-deep oil and gas resources have become an important successor to the increase of reserves and production in various oil fields. The company is engaged in high-temperature and high-pressure oil testing technical services. The deployment of ultra-deep wells in the three major western oil fields is increasing, of which more than 300 are deep wells over 7,000 meters. Deep-ultra-deep reservoirs are generally accompanied by high temperature and high pressure. Generally, formation testing is used to accurately obtain reservoir-related data. Stable test packers are the key factor for the success of formation testing. The imported RTTS and CHAMP test packers currently used are anchored by multiple circular slips. Each circular slip has an independent sealing ring, which leads to many dynamic sealing parts of the anchoring mechanism at the top of the tool, a large amount of sealing rings, and a greater risk of sealing failure. Once a circular slip seal fails during the operation, the entire operation process will fail. Summary of the invention

[0003] The present invention provides an upper single-piston strip slip anchored packer, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing packers use many circular slip tool sealing rings, resulting in a high risk of sealing failure.

[0004] The technical scheme of the present invention is realized through the following measures: an upper single-piston strip-shaped slip anchored packer, comprising an upper joint, an outer tube, and a packing assembly; the inner side of the lower end of the upper joint is threadedly connected to a core shaft with a lower end located below it; a sealing nipple and a piston are sequentially mounted on the outer side of the upper part of the upper joint corresponding to the position below the upper joint from top to bottom; at least one section is provided along the circumference of the core shaft corresponding to the inner position of the lower end of the piston; the lower end of the piston is seated on a step at the lower end of the section; a liquid cavity is provided on the inner side of the middle part of the sealing nipple; a liquid inlet hole that penetrates inside and outside and is connected to the liquid cavity is provided on the core shaft corresponding to the upper position of the liquid cavity; the outer side of the middle part of the sealing nipple is threadedly connected to an outer tube; the lower end of the outer tube is located below the core shaft; the lower part of the piston is connected to the outer tube by a shear pin; the position below the corresponding shear pin The outer cylinder is provided with a first long groove that runs through inside and outside, and a slip cone is provided on the inner side of the upper part of the first long groove. The slip cone is sleeved on the outer side of the lower part of the piston and fixed to the lower part of the piston through a fixing screw. A strip slip is slidably connected to the outer side of the lower end of the slip cone, and the inner side of the lower end of the strip slip is sleeved on the mandrel. The outer cylinder corresponding to the position below the strip slip is provided with a second long groove that runs through inside and outside, and the mandrel corresponding to the position below the strip slip is provided with a first boss, and the first boss is provided with a key whose outer end is located in the upper part of the second long groove. The outer side of the lower end of the mandrel is sleeved together with the inner side of the upper end of the sealing assembly, and the outer side of the upper part of the sealing assembly is threadedly connected with the inner side of the lower end of the outer cylinder. The upper end of the sealing assembly and the lower end of the first boss form a sliding space, and the sealing assembly can seal the pipe string.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned sealing assembly may include a connecting pup joint, a connecting pup joint is sleeved on the outer side of the lower end of the spindle, the outer side of the upper part of the connecting pup joint is threadedly connected to the inner side of the lower end of the outer tube, the upper end of the connecting pup joint and the lower end of the first boss form a sliding space, the inner side of the lower end of the connecting pup joint is threadedly connected to a rubber tube spindle, the outer side of the middle of the rubber tube spindle is sequentially sleeved with a top shoe, a rubber tube and a bottom shoe from top to bottom, the inner side of the upper end of the top shoe is threadedly connected to the outer side of the lower end of the connecting pup joint, the outer side of the lower end of the bottom shoe is threadedly connected to a transition sleeve, the lower end of the rubber tube spindle is located in the transition sleeve and can move up and down in the transition sleeve, the inner side of the lower end of the rubber tube spindle is threadedly connected to a seat sealing spindle, the seat sealing spindle at the lower end of the transition sleeve is sequentially sleeved with a slip sleeve, a mechanical slip sleeve and an open hoop from top to bottom, the outer side of the upper end of the slip sleeve The inner side of the lower end of the transition sleeve is threadedly connected, and the outer side of the lower end of the cava sleeve is slidably connected with the mechanical cava. The open ring hoop is provided with an open ring hoop fastening screw, and the cava sleeve and the open ring hoop are provided with connected axial holes. The cava limit bolt is installed in the axial hole of the cava sleeve and can slide up and down in the axial hole on the open ring hoop. The lower end of the open ring hoop is clamped with a friction block sleeve mounted on the seat seal core shaft, and the upper part of the friction block sleeve is provided with a third long groove that runs through inside and outside. The seat seal core shaft is provided with a second boss that can move up and down in the third long groove, and the outer side of the lower part of the friction block sleeve is clamped with a friction block, and a fixing ring is installed at the lower end of the friction block. The inner side of the lower end of the fixing ring is threadedly connected with the outer side of the lower end of the friction block sleeve; the outer side of the upper end of the sealing short section is threadedly connected with a straightening ring.

[0006] The key may be in an inverted T-shape with a larger lower end and a smaller upper end.

[0007] The above may also include an R-shaped wiping ring, the inner side of the upper end of the sealing end section is provided with an R-shaped wiping ring sleeved on the outer side of the core shaft, the inner side of the upper end of the piston is provided with an R-shaped wiping ring sleeved on the outer side of the core shaft, and the inner side of the upper end of the sealing assembly is provided with an R-shaped wiping ring sleeved on the outer side of the lower part of the core shaft.

[0008] The above-mentioned may also include a sealing assembly and a sealing ring, a sealing assembly is provided between the inner side of the lower part of the upper joint and the central shaft, a sealing assembly is provided between the inner side of the upper part of the sealing short section and the outer side of the central shaft, a sealing assembly is provided between the outer side of the lower part of the sealing short section and the outer tube, a sealing assembly is provided between the inner side of the upper part of the piston and the outer side of the central shaft, a sealing assembly is provided between the outer side of the upper part of the piston and the outer tube, a sealing assembly is provided between the outer side of the upper part of the connecting short section and the central shaft, a sealing assembly is provided between the inner side of the lower part of the connecting short section and the inner side of the upper part of the rubber cartridge central shaft, a sealing assembly is provided between the inner side of the top shoe and the outer side of the rubber cartridge central shaft, a sealing ring is provided between the inner side of the bottom shoe and the outer side of the rubber cartridge central shaft, a sealing assembly is provided between the inner side of the lower part of the rubber cartridge central shaft and the outer side of the upper end of the sealing central shaft, and the sealing assembly includes, from top to bottom, a first supporting seal, a sealing ring, and a second supporting seal.

[0009] The surface of the strip slips can be welded with high-strength alloy materials.

[0010] The present invention has a reasonable and compact structure and is easy to use. A mechanical slip and a rubber cylinder are arranged at the bottom for sealing to prevent the pipe string from falling. A strip slip is arranged at the top for hydraulic anchoring to prevent the pipe string from moving upward due to different pressures inside and outside the pipe string. The single-piston strip slip anchoring mechanism completely reduces the dynamic sealing parts of the tool, reduces the amount of rubber sealing rings used, reduces the risk of sealing failure, and improves the reliability of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic diagram of the main semi-sectional structure of the upper half of an embodiment of the present invention.

[0012] Attached Figure 2 It is a schematic diagram of the front view and half-section structure of the lower half of an embodiment of the present invention.

[0013] The codes in the accompanying drawings are: 1 is an upper joint, 2 is a spindle, 3 is a straightening ring, 4 is a sealing short joint, 5 is an outer cylinder, 6 is a piston, 7 is a shear pin, 8 is a fixing screw, 9 is a slip cone, 10 is a strip slip, 11 is a key, 12 is a connecting short joint, 13 is a rubber cylinder spindle, 14 is a top shoe, 15 is a rubber cylinder, 16 is a bottom shoe, 17 is a transition sleeve, 18 is a slip sleeve, 19 is a slip limit bolt, 20 is a mechanical slip, 21 is an open ring hoop, 22 is an open ring hoop fastening screw, 23 is a friction block sleeve, 24 is a setting spindle, 25 is a friction block, 26 is a fixing ring, 27 is a sealing assembly, 28 is a sealing ring, 29 is a section, 30 is a liquid cavity, 31 is a liquid inlet hole, 32 is a second long groove, 33 is a first boss, 34 is a third long groove, 35 is a second boss, and 36 is an R-shaped rubbing ring. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0015] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0016] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown, the upper end single-piston strip slip anchored packer comprises an upper joint 1, an outer tube 5, and a packing assembly. The inner side of the lower end of the upper joint 1 is threadedly connected to a spindle 2 with its lower end located below it. A sealing nipple 4 and a piston 6 are sequentially mounted on the upper outer side of the upper joint 1 corresponding to the position below the upper joint 1 from top to bottom. The spindle 2 corresponding to the position inside the lower end of the piston 6 is provided with at least one cut surface 29 along the circumference. The lower end of the piston 6 is seated on a step at the lower end of the cut surface 29. A liquid cavity 30 is provided on the inner side of the middle part of the sealing nipple 4. A liquid inlet 31 that penetrates inside and outside and is connected to the liquid cavity 30 is provided on the spindle 2 corresponding to the upper position of the liquid cavity 30. The outer tube 5 is threadedly connected to the outer side of the middle part of the sealing nipple 4. The lower end of the outer tube 5 is located below the spindle 2. The lower part of the piston 6 is connected to the outer tube 5 through a shear pin 7. The outer tube 5 corresponding to the position below the shear pin 7 is provided with an inner A first long groove extending through the outside, a slip cone 9 is provided on the inner side of the upper part of the first long groove, the slip cone 9 is sleeved on the outer side of the lower part of the piston 6 and fixedly installed with the lower part of the piston 6 by fixing screws 8, a strip slip 10 is slidably connected to the outer side of the lower end of the slip cone, the inner side of the lower end of the strip slip 10 is sleeved on the spindle 2, a second long groove 32 extending through the inside and outside is provided on the outer cylinder 5 corresponding to the position below the strip slip 10, a first boss 33 is provided on the spindle 2 corresponding to the position below the strip slip 10, a key 11 with the outer end located in the upper part of the second long groove 32 is provided on the first boss 33, the outer side of the lower end of the spindle 2 is sleeved together with the inner side of the upper end of the sealing assembly, the outer side of the upper part of the sealing assembly is threadedly connected with the inner side of the lower end of the outer cylinder 5, a sliding space is formed between the upper end of the sealing assembly and the lower end of the first boss 33, and the sealing assembly can seal the pipe string.

[0017] The use process is as follows: first, the isolation assembly is sealed with the casing wall. After the sealing, when the pressure in the mandrel 2 is greater than the pressure outside the pipe string, the liquid in the pipe string enters the liquid chamber 30 from the liquid inlet hole 31, and the liquid flows from the liquid chamber 30 to the upper end surface of the piston 6, thereby pushing the piston 6 to move downward. When the piston 6 moves downward, the shear pin 7 is cut off and the slip cone 9 is pushed downward. The slip cone 9 opens the strip slip 10 to make it stuck on the casing wall, realizing hydraulic anchoring and preventing the pipe string from moving upward; the unsealing process is as follows: the pipe string is lifted. Initially, the strip slip 10 is stuck on the casing wall and fixed. The mandrel 2 moves upward to drive the sealing nipple 4, the piston 6 and the slip cone 9 to move upward. The strip slip 10 retracts after losing the support of the slip cone, and the hydraulic anchor is partially unsealed. Secondly, the isolation assembly is unsealed to complete the whole unsealing.

[0018] The present invention designs the packer hydraulic anchor as a single piston strip slip anchoring mechanism, which comprehensively reduces the dynamic sealing parts of the tool and uses less rubber sealing rings. The upper hydraulic anchor cooperates with the lower packer assembly to fix the pipe string to prevent the pipe string from rising and falling.

[0019] The above-mentioned upper single-piston strip slip anchored packer can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2 As shown, a connecting pup joint 12 is sleeved on the outer side of the lower end of the spindle 2, and the outer side of the upper part of the connecting pup joint 12 is threadedly connected to the inner side of the lower end of the outer tube 5, and a sliding space is formed between the upper end of the connecting pup joint 12 and the lower end of the first boss 33. The inner side of the lower end of the connecting pup joint 12 is threadedly connected to the rubber cylinder spindle 13, and the outer side of the middle part of the rubber cylinder spindle 13 is sleeved with a top shoe 14, a rubber cylinder 15, and a bottom shoe 16 in sequence from top to bottom. The inner side of the upper end of the top shoe 14 is threadedly connected to the outer side of the lower end of the connecting pup joint 12, and the outer side of the lower end of the bottom shoe 16 is threadedly connected to a transition sleeve 17. The lower end of the rubber cylinder spindle 13 is located in the transition sleeve 17 and can move up and down in the transition sleeve 17. The inner side of the lower end of the rubber cylinder spindle 13 is threadedly connected to the seat seal spindle 2, and the seat seal spindle 2 at the lower end of the transition sleeve 17 is sleeved with a slip sleeve 18, a mechanical slip sleeve 20, and an open hoop 21 in sequence from top to bottom. The inner side of the lower end is threadedly connected, the outer side of the lower end of the slip sleeve 18 is slidably connected with the mechanical slip 20, the open ring hoop 21 is provided with an open ring hoop fastening screw 22, the slip sleeve 18 and the open ring hoop 21 are provided with a connected axial hole, the slip limit bolt 19 is installed in the axial hole of the slip sleeve 18 and can slide up and down in the axial hole on the open ring hoop 21, the lower end of the open ring hoop 21 is clamped with a friction block sleeve 23 sleeved on the seat seal core shaft 2, the upper part of the friction block sleeve 23 is provided with a third long groove 34 that passes through inside and outside, and the seat seal core shaft 2 is provided with a second boss 35 that can move up and down in the third long groove 34, the outer side of the lower part of the friction block sleeve 23 is clamped with a friction block 25, and a fixing ring 26 is installed at the lower end of the friction block 25. The inner side of the lower end of the fixing ring 26 is threadedly connected with the outer side of the lower end of the friction block sleeve 23, and the outer side of the upper end of the sealing short section 4 is threadedly connected with the straightening ring 3.

[0020] The use process is as follows: the upper end of the upper joint 1 is connected to the pipe string. After the pipe string is lowered to the specified position underground, the pipe string is rotated for transposition. The slip limit bolt 19 can connect the slip sleeve 18 with the open ring hoop 21 to prevent them from rotating relative to each other. The friction block 25 is fixed tightly against the casing wall, and the friction block sleeve 23 is also immovable. The pipe string is pressed down, and the spindle 2 moves downward relative to the connecting short section 12. The key 11 slides downward along the second long groove 32. The connecting short section 12, the rubber tube spindle 13, the top shoe 14, the rubber tube 15, the bottom shoe 16, the transition sleeve 17, and the sealing spindle 2 move downward relative to the friction block 25. The mechanical slip 20 and the open ring hoop 21 are supported and fixed by the friction block sleeve 23. The second boss 35 on the sealing spindle 2 slides downward along the third long groove 34. The transition sleeve 17 moves downward to push the slip sleeve 18 downward relative to the mechanical slip 20, thereby opening the mechanical slip 20. The mechanical slip 20 is stuck on the casing wall and continues to press down the pipe string. The slip sleeve 18 is fixed, the connecting short section 12 and the top shoe 14 press the rubber tube 15 from the top, and the rubber tube 15 expands and sticks to the casing wall to complete the sealing action, so as to prevent the pipe string from falling; Unsealing: After the hydraulic anchor is unsealed, the pipe string continues to be lifted, the key 11 contacts the upper end of the second long groove 32 of the outer tube 5, the mandrel 2 can drive the outer tube 5 to move upward, and the outer tube 5 pulls the connecting short section 12 to move upward, and the connecting short section 12 drives the rubber tube mandrel 13, the top shoe 14, and the sealing mandrel 24 to move upward, so that the rubber tube 15 has space to retract and restore. When the lower part of the rubber tube mandrel 13 contacts the lower end of the bottom shoe 16, the bottom shoe 16 can be pulled to move together, and the bottom shoe 16 drives the transition sleeve 17 and the slip sleeve 18 to move upward together. The mechanical slip 20 retracts after losing the support of the slip sleeve 18, thereby unsealing and completing the unsealing action of the integral packer.

[0021] The pipe string is straightened by setting a straightening ring 3.

[0022] Embodiment 3: As attached Figure 1 , 2 As shown, the key 11 is in an inverted T-shape with a large lower end and a small upper end. By arranging in this way, the key 11 can be prevented from falling.

[0023] Embodiment 4: As attached Figure 1 , 2 As shown, it also includes an R-shaped rubbing ring 36. The inner side of the upper end of the sealing end section is provided with an R-shaped rubbing ring 36 which is sleeved on the outer side of the main shaft 2. The inner side of the upper end of the piston 6 is provided with an R-shaped rubbing ring 36 which is sleeved on the outer side of the main shaft 2. The inner side of the upper end of the sealing assembly is provided with an R-shaped rubbing ring 36 which is sleeved on the outer side of the lower part of the main shaft 2.

[0024] The movable sealing surface is designed with a wiping ring made of wear-resistant material, which can remove crude oil and mud on the surface during the tool movement, protect the sealing ring 28 from damage, and improve the reliability of the tool.

[0025] Embodiment 5: As attached Figure 1 , 2As shown, it also includes a sealing component 27 and a sealing ring 28. A sealing component 27 is provided between the inner side of the lower part of the upper joint 1 and the spindle 2, a sealing component 27 is provided between the inner side of the upper part of the sealing pup joint 4 and the outer side of the spindle 2, a sealing component 27 is provided between the outer side of the lower part of the sealing pup joint 4 and the outer tube 5, a sealing component 27 is provided between the inner side of the upper part of the piston 6 and the outer side of the spindle 2, a sealing component 27 is provided between the outer side of the upper part of the piston 6 and the outer tube 5, a sealing component 27 is provided between the outer side of the upper part of the connecting pup joint 12 and the spindle 2, a sealing component 27 is provided between the inner side of the lower part of the connecting pup joint 12 and the inner side of the upper part of the rubber cartridge spindle 13, a sealing component 27 is provided between the inner side of the top shoe 14 and the outer side of the rubber cartridge spindle 13, a sealing ring 28 is provided between the inner side of the bottom shoe 16 and the outer side of the rubber cartridge spindle 13, a sealing component 27 is provided between the inner side of the lower part of the rubber cartridge spindle 13 and the outer side of the upper end of the setting spindle 24, and the sealing component 27 includes a first supporting seal, a sealing ring, and a second supporting seal from top to bottom.

[0026] The present invention is driven by a piston 6 and has fewer dynamic sealing parts. Compared with the original circular slips that are provided with an independent sealing ring 28 on each slip, the strip slips 10 and mechanical slips 20 used in the present invention do not need to be provided with sealing rings 28, and only two places, the inner and outer rings of the piston 6 and the spindle 2, are provided. In addition, a double support + sealing ring 28 sealing structure is adopted, so the sealing reliability is high, the risk of sealing failure is small, and the reliability of the tool is improved.

[0027] Embodiment 6: As attached Figure 1 , 2 As shown, the surface of the strip slip 10 is welded with high-strength alloy material.

[0028] The strip slips 10 are arranged in this way, so that they have high hardness and can adapt to high-strength casings.

[0029] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An upper single piston strip slip anchored packer, characterized in that The assembly comprises an upper joint, an outer tube and a sealing assembly. The inner side of the lower end of the upper joint is threadedly connected to a core shaft with the lower end located below it. A sealing nipple and a piston are sequentially mounted on the outer side of the upper part of the upper joint corresponding to the position below the upper joint from top to bottom. The core shaft corresponding to the inner side of the lower end of the piston is provided with at least one section along the circumference. The lower end of the piston is seated on a step at the lower end of the section. A liquid cavity is provided on the inner side of the middle part of the sealing nipple. A liquid inlet hole that is connected to the liquid cavity and is connected to the liquid cavity is provided on the core shaft corresponding to the upper position of the liquid cavity. The outer side of the middle part of the sealing nipple is threadedly connected to an outer tube. The lower end of the outer tube is located below the core shaft. The lower part of the piston is connected to the outer tube by a shear pin. The outer tube corresponding to the position below the shear pin is provided with a first long groove that is connected to the inside and outside. A slip cone is provided on the inner side of the upper part of the groove, and the slip cone is sleeved on the outer side of the lower part of the piston and fixed to the lower part of the piston by fixing screws. A strip slip is slidably connected to the outer side of the lower end of the slip cone, and the inner side of the lower end of the strip slip is sleeved on the core shaft. A second long groove that runs through inside and outside is provided on the outer cylinder corresponding to the position below the strip slip, and a first boss is provided on the core shaft corresponding to the position below the strip slip. A key whose outer end is located in the upper part of the second long groove is provided on the first boss. The outer side of the lower end of the core shaft is sleeved together with the inner side of the upper end of the sealing assembly, and the outer side of the upper part of the sealing assembly is threadedly connected with the inner side of the lower end of the outer cylinder. A sliding space is formed between the upper end of the sealing assembly and the lower end of the first boss, and the sealing assembly can seal the pipe string.

2. The upper end single piston strip slip anchored packer according to claim 1, characterized in that The sealing assembly includes a connecting pup joint, a connecting pup joint is sleeved on the outer side of the lower end of the spindle, the outer side of the upper part of the connecting pup joint is threadedly connected to the inner side of the lower end of the outer tube, a sliding space is formed between the upper end of the connecting pup joint and the lower end of the first boss, the inner side of the lower end of the connecting pup joint is threadedly connected to a rubber tube spindle, the outer side of the middle part of the rubber tube spindle is sequentially sleeved with a top shoe, a rubber tube and a bottom shoe from top to bottom, the inner side of the upper end of the top shoe is threadedly connected to the outer side of the lower end of the connecting pup joint, the outer side of the lower end of the bottom shoe is threadedly connected to a transition sleeve, the lower end of the rubber tube spindle is located in the transition sleeve and can move up and down in the transition sleeve, the inner side of the lower end of the rubber tube spindle is threadedly connected to a seat seal spindle, the seat seal spindle at the lower end of the transition sleeve is sequentially sleeved with a slip sleeve, a mechanical slip sleeve and an open hoop from top to bottom, the outer side of the upper end of the slip sleeve is threadedly connected to the transition sleeve The inner side of the lower end of the sleeve is threadedly connected, and the outer side of the lower end of the cava sleeve is slidably connected with the mechanical cava. The open hoop is provided with an open hoop fastening screw, and the cava sleeve and the open hoop are provided with connected axial holes. The cava limit bolt is installed in the axial hole of the cava sleeve and can slide up and down in the axial hole on the open hoop. The lower end of the open hoop is clamped with a friction block sleeve sleeved on the seat seal core shaft, and the upper part of the friction block sleeve is provided with a third long groove that runs through inside and outside. The seat seal core shaft is provided with a second boss that can move up and down in the third long groove, and the outer side of the lower part of the friction block sleeve is clamped with a friction block, and a fixing ring is installed at the lower end of the friction block, and the inner side of the lower end of the fixing ring is threadedly connected with the outer side of the lower end of the friction block sleeve; the outer side of the upper end of the sealing short section is threadedly connected with a straightening ring.

3. The upper end single piston strip slip anchored packer according to claim 1 or 2, characterized in that The key is in an inverted T shape with a larger lower end and a smaller upper end.

4. The upper end single piston strip slip anchored packer according to claim 1 or 2, characterized in that It also includes an R-shaped wiping ring. The inner side of the upper end of the sealing end section is provided with an R-shaped wiping ring which is sleeved on the outer side of the central shaft. The inner side of the upper end of the piston is provided with an R-shaped wiping ring which is sleeved on the outer side of the central shaft. The inner side of the upper end of the sealing assembly is provided with an R-shaped wiping ring which is sleeved on the outer side of the lower part of the central shaft.

5. The upper end single piston strip slip anchored packer according to claim 3, characterized in that It also includes an R-shaped wiping ring. The inner side of the upper end of the sealing end section is provided with an R-shaped wiping ring which is sleeved on the outer side of the central shaft. The inner side of the upper end of the piston is provided with an R-shaped wiping ring which is sleeved on the outer side of the central shaft. The inner side of the upper end of the sealing assembly is provided with an R-shaped wiping ring which is sleeved on the outer side of the lower part of the central shaft.

6. The upper end single piston strip slip anchored packer according to claim 2 or 5, characterized in that It also includes a sealing assembly and a sealing ring, a sealing assembly is provided between the inner side of the lower part of the upper joint and the central shaft, a sealing assembly is provided between the inner side of the upper part of the sealing short section and the outer side of the central shaft, a sealing assembly is provided between the outer side of the lower part of the sealing short section and the outer tube, a sealing assembly is provided between the inner side of the upper part of the piston and the outer side of the central shaft, a sealing assembly is provided between the outer side of the upper part of the piston and the outer tube, a sealing assembly is provided between the outer side of the upper part of the connecting short section and the central shaft, a sealing assembly is provided between the inner side of the lower part of the connecting short section and the inner side of the upper part of the rubber tube central shaft, a sealing assembly is provided between the inner side of the top shoe and the outer side of the rubber tube central shaft, a sealing ring is provided between the inner side of the bottom shoe and the outer side of the rubber tube central shaft, a sealing assembly is provided between the inner side of the lower part of the rubber tube central shaft and the outer side of the upper end of the sealing central shaft, and the sealing assembly includes a first supporting seal, a sealing ring, and a second supporting seal from top to bottom.

7. The upper end single piston strip slip anchored packer according to claim 3, characterized in that It also includes a sealing assembly and a sealing ring, a sealing assembly is provided between the inner side of the lower part of the upper joint and the central shaft, a sealing assembly is provided between the inner side of the upper part of the sealing short section and the outer side of the central shaft, a sealing assembly is provided between the outer side of the lower part of the sealing short section and the outer tube, a sealing assembly is provided between the inner side of the upper part of the piston and the outer side of the central shaft, a sealing assembly is provided between the outer side of the upper part of the piston and the outer tube, a sealing assembly is provided between the outer side of the upper part of the connecting short section and the central shaft, a sealing assembly is provided between the inner side of the lower part of the connecting short section and the inner side of the upper part of the rubber tube central shaft, a sealing assembly is provided between the inner side of the top shoe and the outer side of the rubber tube central shaft, a sealing ring is provided between the inner side of the bottom shoe and the outer side of the rubber tube central shaft, a sealing assembly is provided between the inner side of the lower part of the rubber tube central shaft and the outer side of the upper end of the sealing central shaft, and the sealing assembly includes a first supporting seal, a sealing ring, and a second supporting seal from top to bottom.

8. The upper end single piston strip slip anchored packer according to claim 4, characterized in that It also includes a sealing assembly and a sealing ring, a sealing assembly is provided between the inner side of the lower part of the upper joint and the central shaft, a sealing assembly is provided between the inner side of the upper part of the sealing short section and the outer side of the central shaft, a sealing assembly is provided between the outer side of the lower part of the sealing short section and the outer tube, a sealing assembly is provided between the inner side of the upper part of the piston and the outer side of the central shaft, a sealing assembly is provided between the outer side of the upper part of the piston and the outer tube, a sealing assembly is provided between the outer side of the upper part of the connecting short section and the central shaft, a sealing assembly is provided between the inner side of the lower part of the connecting short section and the inner side of the upper part of the rubber tube central shaft, a sealing assembly is provided between the inner side of the top shoe and the outer side of the rubber tube central shaft, a sealing ring is provided between the inner side of the bottom shoe and the outer side of the rubber tube central shaft, a sealing assembly is provided between the inner side of the lower part of the rubber tube central shaft and the outer side of the upper end of the sealing central shaft, and the sealing assembly includes a first supporting seal, a sealing ring, and a second supporting seal from top to bottom.

9. The upper end single piston strip slip anchored packer according to claim 1 or 2 or 5 or 7 or 8, characterized in that The surface of the strip slips is welded with high-strength alloy material.

10. The upper end single piston strip slip anchored packer according to claim 6, characterized in that The surface of the strip slips is welded with high-strength alloy material.

Images