Packer feeding tool

Abstract

The invention discloses a packer feeding tool which comprises a body, a flow channel is formed in the body, the body is provided with a cylinder section, an elastic barrel is arranged on the peripheral side of the cylinder section in a sleeving mode, a first external thread is arranged on the peripheral wall of the barrel, the packer feeding tool further comprises a tie-back barrel, a first internal thread matched with the first external thread is arranged in the tie-back barrel, and a second internal thread matched with the first external thread is arranged in the tie-back barrel. The packer feeding tool comprises a barrel, a flow channel is formed in the barrel, a pressurizing cavity is formed in the upstream of the barrel and communicated with the flow channel, the packer feeding tool further comprises a supporting body, the supporting body is provided with a stress end located on the upstream and a supporting protrusion located on the downstream, a reserved space is formed in the downstream of the supporting body, and the packer feeding tool has an initial state and a natural state. The supporting protrusion is located between the cylinder section and the cylinder body and opens the cylinder body. In the natural state, the supporting protrusions do not open the cylinder body so that the cylinder body can recover to the natural state. The well completion pipe string feeding and mechanical and hydraulic double-acting releasing can be carried out, and effective sealing in the acid fracturing process and quick drilling removal of a tie-back barrel after fracturing are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of well completion tools in the process of oil and gas exploration and development, and in particular to a packer running tool. Background Art

[0002] Some oil fields use open hole completion, but during the production process, wellbore collapse is easily caused by improper production pressure difference control, failure of oil layer casing cementing to completely seal the mudstone section, and post-measure operations. Wellbore collapse brings great harm to the normal production of oil and gas wells, and may cause oil and gas wells to stop production, bury pipe strings, and cause serious damage to surface equipment and downhole tools.

[0003] In order to reduce the harm caused by wellbore collapse, oil fields are currently using the "ball-throwing sleeve + open-hole packer" staged fracturing completion process. However, this process makes sidetracking difficult in the later stages. To achieve sidetracking in the later stages, an easy-to-drill hanging packer is used. The packer can be drilled out, providing space for sidetracking in the later stages for the wellbore support completion process and the open-hole staged fracturing completion process, reducing the difficulty of later workover.

[0004] For packers or easy-to-drill suspension packers, conventional delivery tools use a forward-rotating mechanical release method, which carries the risk of release failure, especially for deep and ultra-deep wells. When the delivery tool is located in the deflection section, the tubing cannot provide effective torque in the wellbore due to friction and other reasons, further increasing the difficulty of release.

[0005] Therefore, how to provide a delivery tool that can avoid the above-mentioned disadvantages has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The technical problem to be solved by the present invention is to achieve the safe lowering and smooth release of the pipe string of the packer (which can be an easy-to-drill suspension packer), and further provide a new type of delivery tool that can deliver the completion pipe string and release it mechanically and hydraulically, thereby achieving effective sealing during the acid fracturing process and rapid drilling and removal of the tie-back tube (the tie-back tube is an easy-to-drill tie-back tube) after fracturing.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] A packer delivery tool comprises a body with a length, wherein the two ends of the body along the length direction are respectively an upstream end and a downstream end, a flow channel is provided in the body, which passes through the upstream end and the downstream end and extends along the length direction, the upstream end is used to connect a driving body to drive the body to rotate, the body has a cylindrical section, and a cylinder with two ends being opened and elastic is sleeved on the outer peripheral side of the cylindrical section, a first external thread is provided on the outer peripheral wall of the cylinder, and also comprises a return cylinder, the return cylinder is used to connect the packer and a first internal thread matching the first external thread is provided therein, a pressurized chamber located outside the body is provided upstream of the cylinder, the pressurized chamber is connected to the flow channel for receiving pressurized liquid transported by the flow channel, and also comprises a support body, the support body has a force-bearing end located upstream and a supporting protrusion located downstream, and a reserved space is provided downstream of the support body so that the support body can move downstream, and the packer delivery tool has an initial state and a natural state:

[0009] In the initial state, the force-bearing end of the support body is located in the pressure-charging chamber, the support protrusion is located between the cylindrical section and the cylinder and props up the cylinder so that the cylinder is in an outward expansion state, the first external thread on the cylinder in the outward expansion state engages with the first internal thread in the tie-back cylinder, and a first circumferential limiting structure is provided between the support body and the cylindrical section, and a second circumferential limiting structure is provided between the support body and the main body;

[0010] In the natural state, the support protrusion does not open the cylinder so that the cylinder returns to its natural shape, and the first external thread on the cylinder in the natural shape does not engage with the first internal thread in the tie-back cylinder.

[0011] Preferably, the cylinder comprises an upstream section, a main body section and a downstream section connected in sequence, the end face of the upstream section away from the main body section is the head end, the end face of the downstream section away from the main body section is the tail end, a plurality of head-to-tail gaps and tail-to-head gaps arranged alternately in sequence at intervals are provided on the outer wall of the cylinder, the head-to-tail gaps and tail-to-head gaps are both connected to the interior of the cylinder and are both extended along the axial direction of the cylinder, the head-to-tail gaps are gaps that penetrate the upstream section and the main body section but do not penetrate the downstream section, and the tail-to-head gaps are gaps that penetrate the downstream section and the main body section The upstream section is presented as a plurality of unit sections arranged at intervals along the circumferential direction of the cylinder, and a tail-head gap is presented downstream of each unit section. The support body is a support sleeve, and a plurality of support protrusions are arranged along the circumferential direction of the support sleeve, each support protrusion corresponds to each unit section one by one, and in the initial state, the support protrusions are all abutted against the unit section, and the width of the tail-head gap is greater than the width of the support protrusions so that in the natural state, the support protrusions are all extended into the tail-head gap.

[0012] Preferably, the supporting protrusion has a first inclined surface, and the inner side surface of the unit segment has a second inclined surface matching the first inclined surface.

[0013] Preferably, it also includes an upper joint and a support sleeve, the upper joint is hollow and is threadedly connected to the main body at a position near its upstream end, the hollow is connected to the flow channel, the other end of the upper joint is used to connect the drilling tool, one end of the support sleeve is fixedly connected to the outer wall of the upper joint, and the other end is abutted to the head end of the cylinder, the downstream end face of the lower joint, the head end of the cylinder, the corresponding outer wall of the main body and the inner wall of the support sleeve are combined to form the charging chamber, and a connecting hole is opened on the side wall of the main body corresponding to the charging chamber so that the charging chamber is connected to the flow channel.

[0014] Preferably, it also includes a piston body located in the pressure charging chamber, whose front end is located downstream of the connecting hole and the shape of the cross section of the front end is the same as the shape of the pressure charging chamber so that it fills the pressure charging chamber, and the rear end of the piston body abuts against the force-bearing end of the support body.

[0015] Preferably, it also includes a retaining ring and a hydraulic release-activating shear pin, the retaining ring being fixedly sleeved to the outer side wall of the main body, the upstream end of the retaining ring being abutted against the rear end of the cylinder, and a gap being present between the retaining ring and the outer side wall of the main body to form the reserved space, and in the initial state, the downstream end of the support sleeve extends out of the rear end of the cylinder and does not abut against the retaining ring, the hydraulic release-activating shear pin passes through the retaining ring and its free end is embedded in the support sleeve, and in the initial state, the hydraulic release-activating shear pin and the retaining ring fix the support sleeve to form the second circumferential limiting structure.

[0016] Preferably, it also includes a lower joint with a hollow configuration, the hollow portion being connected to the flow channel, the lower joint being located downstream of the retaining ring and being fixedly sleeved on the outside of the main body, and a sealing assembly being provided on the outer side wall of the lower joint, so that a sealing structure is formed between the lower joint and the return tube located on the outside thereof.

[0017] Preferably, the support sleeve is provided with a plurality of protruding ribs at intervals in the circumferential direction, and the protruding ribs are embedded in corresponding grooves provided in the inner side of the cylinder body to form the first circumferential limiting structure.

[0018] Preferably, the first external thread is an undercut thread.

[0019] Preferably, an inner step is formed in the flow channel downstream of the position communicating with the pressure chamber, and the inner step is used to receive a pitched ball.

[0020] Technical effects:

[0021] The delivery tool has a mechanical and hydraulic dual-action release mode to achieve safe running and release of the pipe string. Specifically, in the initial state, the support body is used to expand the barrel outward to achieve the connection between the main body and the tie-back barrel (the tie-back barrel can be an easy-to-drill acid-resistant tie-back barrel), and then the tie-back barrel is connected to the packer to be delivered (the packer can be an easy-to-drill packer), and then the assembled main body, easy-to-drill acid-resistant tie-back barrel and packer are lowered into the well through the drill pipe (as part of the driving body). During the release operation, a mechanical release method can be used first: that is, the driving body drives the main body to rotate, and then drives the cylinder to rotate synchronously, so that the first external thread disengages from the first internal thread, and then the main body and the return cylinder are separated. If the mechanical release method fails, a hydraulic release method is used: injecting flowing liquid, and arranging a ball in the downstream packer to make the pipe pressurized, and then the flowing liquid enters the pressurized chamber through the flow channel to push the force-bearing end of the support body, so that the support body moves downward, and then switches to a natural state. At this time, the first external thread on the cylinder does not engage with the first internal thread in the return cylinder, and the release is achieved.

[0022] Preferably, the configuration of the cylinder facilitates its outward expansion, and a number of unit segments thereon are used to cooperate with a number of supporting protrusions, which can efficiently complete the outward expansion action and restore the natural state.

[0023] Preferably, the setting of starting the shearing nail by hydraulic release can make the running tool in the initial state be in a more stable state.

[0024] Preferably, an inner step is formed in the flow channel downstream of the position connected to the pressurized chamber, and the inner step is used to receive a thrown ball. When the hydraulic release is performed, the thrown ball can be directly abutted by the inner step, thereby achieving the effect of holding pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a part of the structure related to the body of a packer running tool provided by the present invention;

[0026] Figure 2 It is a structural schematic diagram of the tie-back tube;

[0027] Figure 3 It is a schematic diagram of the structure of the cylinder.

[0028] Figure 1-3 The accompanying drawings are denoted as follows:

[0029] 1 body, 2 flow channel, 3 cylinder, 4 first external thread, 5 return cylinder, 6 pressurized chamber, 7 support sleeve, 8 force end, 9 support protrusion, 10 reserved space, 11 upstream section, 12 body section, 13 downstream section, 14 head end, 15 tail end, 16 head-to-tail gap, 17 tail-to-head gap, 18 unit section, 19 upper joint, 20 support sleeve, 21 connecting hole, 22 piston body, 23 retaining ring, 24 hydraulic release start shear pin, 25 lower joint, 26 sealing assembly, 27 inner step. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below.

[0031] The present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0032] For the sake of clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would obscure the present invention with unnecessary details. It should be recognized that in the development of any actual embodiment, a large number of implementation details must be made to achieve the specific goals of the developer.

[0033] In order to make the purpose and features of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0034] Combination Figure 1-3The present invention provides a packer delivery tool, comprising a main body 1 having a length, wherein the two ends of the main body 1 along the length direction are respectively an upstream end and a downstream end, and a flow channel 2 is provided in the main body 1, which passes through the upstream end and the downstream end and extends along the length direction, and the upstream end is used to connect a driving body to drive the main body 1 to rotate, and the main body 1 has a cylindrical section, and a cylinder 3 with two ends being open and elastic is sleeved on the outer peripheral side of the cylindrical section, and a first external thread 4 is provided on the outer peripheral wall of the cylinder 3, and a return cylinder 5 is also included, The return tube 5 is used to connect the packer and is provided with a first internal thread matching the first external thread 4. A pressurized chamber 6 located outside the main body 1 is provided upstream of the cylinder 3. The pressurized chamber 6 is connected to the flow channel 2 for receiving the pressurized liquid delivered by the flow channel 2. It also includes a support body, which has a force-bearing end 8 located upstream and a support protrusion 9 located downstream. A reserved space 10 is provided downstream of the support body so that the support body can move downstream. The packer delivery tool has an initial state and a natural state:

[0035] In the initial state, the force-bearing end 8 of the support body is located in the pressure chamber 6, the support protrusion 9 is located between the cylindrical section and the cylinder 3 and props up the cylinder 3 so that the cylinder 3 is in an outward expansion state, the first external thread 4 on the cylinder 3 in the outward expansion state engages with the first internal thread in the tie-back cylinder 5, and a first circumferential limiting structure is provided between the support body and the cylindrical section, and a second circumferential limiting structure is provided between the support body and the main body 1;

[0036] In the natural state, the support protrusion 9 does not open the cylinder 3 so that the cylinder 3 returns to its natural shape, and the first external thread 4 on the cylinder 3 in the natural shape does not engage with the first internal thread in the tie-back cylinder 5 .

[0037] The delivery tool has a mechanical and hydraulic dual-action release mode to achieve safe running and release of the pipe string. Specifically, in the initial state, the support body is used to expand the barrel 3 outward to achieve the connection between the main body 1 and the tie-back barrel 5 (the tie-back barrel 5 can be an easy-to-drill acid-resistant tie-back barrel), and then the tie-back barrel 5 is connected to the packer to be delivered (the packer can be an easy-to-drill packer), and then the assembled main body 1, the easy-to-drill acid-resistant tie-back barrel and the packer are lowered into the well through the drill pipe (as part of the driving body). During the release operation, a mechanical release method can be used first: that is, the driving body drives the main body 1 to rotate, and then drives the cylinder 3 to rotate synchronously, so that the first external thread 4 disengages from the first internal thread, and then the main body 1 and the return cylinder 5 are separated. If the mechanical release method fails, a hydraulic release method is used: injecting flowing liquid, and arranging a ball in the downstream packer to make the pipe pressurized, and then the flowing liquid enters the pressure-charging chamber 6 through the flow channel 2 to push the force-bearing end 8 of the support body, so that the support body moves downward, and then switches to the natural state. At this time, the first external thread 4 on the cylinder 3 does not engage with the first internal thread in the return cylinder 5, and the release is achieved.

[0038] In a specific implementation manner, Figure 3 As shown, the cylinder 3 includes an upstream section 11, a main section 12 and a downstream section 13 connected in sequence, the end face of the upstream section 11 away from the main section 12 is the head end 14, the end face of the downstream section 13 away from the main section 12 is the tail end 15, and a plurality of head-to-tail gaps 16 and tail-to-head gaps 17 are arranged alternately in sequence on the outer wall of the cylinder 3, the head-to-tail gaps 16 and tail-to-head gaps 17 are both connected to the interior of the cylinder 3 and are both extended along the axial direction of the cylinder 3, the head-to-tail gaps 16 are gaps that penetrate the upstream section 11 and the main section 12 and do not penetrate the downstream section 13, and the tail-to-head gaps 17 are gaps that penetrate the downstream section 13. The upstream section 11 is composed of a plurality of unit sections 18 arranged at intervals along the circumferential direction of the cylinder 3, and a tail-head gap 17 is presented downstream of each unit section 18. The support body is a support sleeve 7, and a plurality of support protrusions 9 are arranged along the circumferential direction of the support sleeve 7. Each support protrusion 9 corresponds to each unit section 18 one by one. In the initial state, the support protrusions 9 are all in contact with the unit section 18, and the width of the tail-head gap 17 is greater than the width of the support protrusions 9 so that in the natural state, the support protrusions 9 extend into the tail-head gap 17.

[0039] The arrangement of the cylinder 3 facilitates its outward expansion, and the plurality of unit segments 18 thereon are used to cooperate with the plurality of supporting protrusions 9, so as to efficiently complete the outward expansion action and restore the natural state.

[0040] In a specific implementation, the support protrusion 9 has a first inclined surface, and the inner side surface of the unit segment 18 has a second inclined surface matching the first inclined surface, so as to facilitate the abutment and matching between the two.

[0041] like Figure 1 As shown, in a specific embodiment, it also includes an upper joint 19 and a support sleeve 20, the upper joint 19 is hollow and is threadedly connected to the main body 1 at a position near its upstream end, the hollow is connected to the flow channel 2, the other end of the upper joint 19 is used to connect the drilling tool, one end of the support sleeve 7 is fixedly connected to the outer wall of the upper joint 19, and the other end is abutted to the head end 14 of the cylinder 3, the downstream end face of the upper joint 19, the head end of the cylinder 3, the corresponding outer wall of the main body 1 and the inner wall of the support sleeve 7 are combined to form the charging chamber 6, and a connecting hole 21 is opened on the side wall of the main body 1 corresponding to the charging chamber 6 so that the charging chamber 6 is connected to the flow channel 2.

[0042] Furthermore, it also includes a piston body 22 located in the pressure chamber 6, whose front end is located downstream of the connecting hole 21 and the shape of the cross section of the front end is the same as the shape of the pressure chamber 6 so that it is fully distributed in the pressure chamber 6, and the rear end of the piston body 22 abuts against the force-bearing end 8 of the support body.

[0043] like Figure 1 As shown, in a specific embodiment, it also includes a retaining ring 23 and a hydraulic release-activating shearing nail 24, the retaining ring 23 is fixedly sleeved to the outer wall of the main body 1, the upstream end of the retaining ring 23 abuts against the tail end 15 of the cylinder 3, and there is a gap between the retaining ring 23 and the outer wall of the main body 1 to form the reserved space 10. In the initial state, the downstream end of the support sleeve 7 extends out of the tail end of the cylinder 3 and does not abut against the retaining ring 23, the hydraulic release-activating shearing nail 24 passes through the retaining ring 23 and its free end is embedded in the support sleeve 7. In the initial state, the hydraulic release-activating shearing nail 24 and the retaining ring 23 fix the support sleeve 20 to form the second circumferential limiting structure.

[0044] The setting of the hydraulic release to start the shearing of 24 nails can make the running tool in the initial state in a more stable state.

[0045] In a specific embodiment, it also includes a lower joint 25 with a hollow configuration, the hollow portion being connected to the flow channel 2, the lower joint 25 being located downstream of the retaining ring 23 and being fixedly sleeved on the outside of the main body 1, and a sealing assembly 26 being provided on the outer wall of the lower joint 25, so that a sealing structure is formed between the lower joint 25 and the return tube 5 located on the outside thereof.

[0046] The sealing components 26 are multiple groups, and a sealing ring is vulcanized at each end of the sealing components 26. The lower part of the sealing components 26 is fixed with a sealing retaining ring.

[0047] The support sleeve 7 is provided with a plurality of protruding ribs at intervals in the circumferential direction, and the protruding ribs are embedded in corresponding grooves provided on the inner side of the cylinder body 3 to form the first circumferential limiting structure.

[0048] In a specific implementation manner, the first external thread 4 is an undercut thread.

[0049] like Figure 1 As shown, in a specific embodiment, an inner step 27 is formed in the flow channel 2 at the downstream of the position where it is connected to the pressure chamber 6, and the inner step 27 is used to receive a pitched ball.

[0050] An inner step 27 is formed in the flow channel 2 at the downstream of the position connected to the pressure chamber 6. The inner step 27 is used to receive a ball. When the hydraulic release is performed, the ball is directly abutted by the inner step 27, thereby achieving the effect of holding pressure.

[0051] In a specific implementation manner, the tie-back tube 5 is an easy-to-drill, acid-resistant tie-back tube.

[0052] The feeding process is as follows:

[0053] 1) Assemble the simulated well-drilling string of "drilling tool assembly + special well-drilling gauge + round-head guide shoe" to the bottom of the well. Drill the well repeatedly to ensure that the well wall is smooth, lift the drill, and add grout in the wellbore in time during the process of lifting the drill.

[0054] 2) lowering the main body 1 and the easy-to-drill acid-resistant return tube into the well through the drill pipe. The drill pipe is fixedly connected to the upper joint 19.

[0055] 3) Lift the pipe string until it is 3-5t above the middle and hanging weight of the drill bit, slowly rotate the drill bit forward, observe the change of the hanging weight, and lift the drill bit after confirming that the tool has been successfully released. During the process of lifting the drill bit, add grout in the casing in time.

[0056] 4) If the release is not possible after forward rotation, directly build up pressure in the pipe (or throw a ball to the step inside the delivery tool to build up pressure), start the hydraulic release related components, and perform hydraulic release. Specifically, when the pressure in the pipe reaches above 30MPa, the hydraulic release starts the shear pins 24 to cut off, and continue to build up pressure. The undercut nut of the cylinder 3 elastically contracts to achieve release, and the delivery tool is lifted up and out.

[0057] 5) The acid fracturing team prepares fluid, injects acid and performs acid fracturing.

[0058] 6) If water is seen or there is no production in the later stage, the drill bit will be milled and the acid-resistant tie-back tube will be drilled sideways to drill a new wellbore.

[0059] (In the above step 3) In order to ensure that the aluminum alloy oil pipe is not corroded during the acid pressing process, a special acid-resistant process is used. A layer of copper coating is plated on the surface of the base body inside the return tube 5 through the electrolytic principle. It has excellent corrosion resistance under high temperature 90°C and 20% hydrochloric acid environment, which can meet the requirements of on-site acid pressing construction. The thickness of the copper coating is about 100μ.

[0060] (In the above step 4) In order to ensure that side drilling can be carried out in the later stage, an aluminum alloy support pipe column is used. Generally, 2 series aluminum alloy is used, and the 2 series aluminum alloy is modified to increase the content of certain elements in the alloy and improve the high temperature tensile properties of the alloy. Finite element numerical simulation and indoor experiments show that the outer diameter of the pipe column is 101mm, the wall thickness is 10mm, the internal pressure resistance is greater than 50MPa, and the tensile strength is greater than 60T, which can meet the construction requirements of oil well pipes in different working conditions. In the later stage of production, side drilling is required to see water or find residual oil. The pressure is increased to 20KN, the drilling speed is 50r.min-1, the length of the aluminum alloy pipe is 2m, and the drilling and grinding time is 28min. As the drilling pressure and drilling speed increase, the drilling and grinding time is shorter.

[0061] The easy-to-drill packer delivery tool provided by the present invention can ensure the lowering and safe release of the pipe string, ensure acid fracturing in the later stage, make drilling easy in the later stage of production, reduce the difficulty of well repair and reduce the well repair cost.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention, so the above is only an embodiment of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention also includes various equivalent changes and improvements, which will fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A packer running tool, characterized in that: The invention comprises a main body having a length, wherein the two ends of the main body along the length direction are respectively an upstream end and a downstream end, a flow channel penetrating the upstream end and the downstream end and extending along the length direction is provided in the main body, the upstream end is used to connect a driving body to drive the main body to rotate, the main body has a cylindrical section, the outer peripheral side of the cylindrical section is sleeved with a cylinder with two ends being open and elastic, a first external thread is provided on the outer peripheral wall of the cylinder, and a return cylinder is also provided, the return cylinder is used to connect the packer and a first internal thread matching the first external thread is provided therein, a pressurized chamber located outside the main body is provided upstream of the cylinder, the pressurized chamber is connected to the flow channel for receiving the pressurized liquid transported by the flow channel, and a support body is also provided, the support body has a force-bearing end located upstream and a supporting protrusion located downstream, a reserved space is provided downstream of the support body so that the support body can move downstream, and the packer delivery tool has an initial state and a natural state: In the initial state, the force-bearing end of the support body is located in the pressure-charging chamber, the support protrusion is located between the cylindrical section and the cylinder and props up the cylinder so that the cylinder is in an outward expansion state, the first external thread on the cylinder in the outward expansion state engages with the first internal thread in the tie-back cylinder, and a first circumferential limiting structure is provided between the support body and the cylindrical section, and a second circumferential limiting structure is provided between the support body and the main body; In the natural state, the support protrusion does not open the cylinder so that the cylinder returns to its natural shape, and the first external thread on the cylinder in the natural shape does not engage with the first internal thread in the tie-back cylinder.

2. The packer running tool according to claim 1, characterized in that: The cylinder comprises an upstream section, a main body section and a downstream section which are connected in sequence, the end face of the upstream section away from the main body section is the head end, the end face of the downstream section away from the main body section is the tail end, a plurality of head-to-tail gaps and tail-to-head gaps which are arranged alternately and at intervals in sequence are provided on the outer side wall of the cylinder, the head-to-tail gaps and tail-to-head gaps are both connected to the interior of the cylinder and are both extended and arranged along the axial direction of the cylinder, the head-to-tail gaps are gaps which penetrate the upstream section and the main body section but do not penetrate the downstream section, the tail-to-head gaps are gaps which penetrate the downstream section and the main body section and There is no gap that penetrates the upstream section, and the upstream section is presented as a plurality of unit sections arranged at intervals along the circumferential direction of the cylinder, and a tail-head gap is presented downstream of each unit section. The support body is a support sleeve, and a plurality of support protrusions are arranged along the circumferential direction of the support sleeve, and each support protrusion corresponds to each unit section one by one. In the initial state, the support protrusions are all abutted against the unit section, and the width of the tail-head gap is greater than the width of the support protrusions so that in the natural state, the support protrusions are all extended into the tail-head gap.

3. The packer running tool according to claim 2, characterized in that: The supporting protrusion has a first inclined surface, and the inner side surface of the unit segment has a second inclined surface matching the first inclined surface.

4. The packer running tool according to claim 2, characterized in that: It also includes an upper joint and a support sleeve, the upper joint is hollow and is threadedly connected to the main body at a position near its upstream end, the hollow is connected to the flow channel, the other end of the upper joint is used to connect the drilling tool, one end of the support sleeve is fixedly connected to the outer wall of the upper joint, and the other end is abutted to the head end of the cylinder, the downstream end face of the lower joint, the head end of the cylinder, the corresponding outer wall of the main body and the inner wall of the support sleeve are combined to form the charging chamber, and a connecting hole is opened on the side wall of the main body corresponding to the charging chamber so that the charging chamber is connected to the flow channel.

5. The packer running tool according to claim 4, characterized in that: It also includes a piston body located in the pressure charging chamber, whose front end is located downstream of the connecting hole and the shape of the cross section of the front end is the same as the shape of the pressure charging chamber so that it fills the pressure charging chamber, and the rear end of the piston body abuts against the force-bearing end of the support body.

6. The packer running tool according to claim 5, characterized in that: It also includes a retaining ring and a hydraulic release-activating shear pin, the retaining ring being fixedly sleeved to the outer side wall of the main body, the upstream end of the retaining ring being abutted against the rear end of the cylinder, a gap being present between the retaining ring and the outer side wall of the main body to form the reserved space, and in the initial state, the downstream end of the support sleeve extending out from the rear end of the cylinder and not abutting against the retaining ring, the hydraulic release-activating shear pin passing through the retaining ring and its free end being embedded in the support sleeve, and in the initial state, the hydraulic release-activating shear pin and the retaining ring fixing the support sleeve to form the second circumferential limiting structure.

7. The packer running tool according to claim 6, characterized in that: It also includes a lower joint with a hollow configuration, the hollow portion of which is connected to the flow channel. The lower joint is located downstream of the retaining ring and is fixedly sleeved on the outside of the main body. A sealing assembly is provided on the outer wall of the lower joint to form a sealing structure between the lower joint and the return tube located on the outside thereof.

8. The packer running tool according to claim 6, characterized in that: The support sleeve is provided with a plurality of protruding ribs at intervals in the circumferential direction, and the protruding ribs are embedded in corresponding grooves provided in the inner side of the cylinder body to form the first circumferential limiting structure.

9. The packer running tool according to claim 1, characterized in that: The first external thread is an undercut thread.

10. The packer running tool according to claim 1, characterized in that: An inner step is formed in the flow channel at a position downstream of the position communicating with the pressure chamber, and the inner step is used to receive a pitched ball.

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