Mechanical-hydraulic composite setting packer and using method thereof

Abstract

The invention relates to the technical field of oil and gas development well completion, in particular to a mechanical-hydraulic composite setting packer and a using method thereof. Comprising an upper connector, a center pipe, a rubber sleeve assembly, a cone, a slip assembly, a transposition assembly, a hydraulic assembly and a lower connector, the upper end of the center pipe is connected with the upper connector, the lower end of the center pipe is connected with the lower connector, and the center pipe is sleeved with the rubber sleeve assembly, the cone, the slip assembly, the transposition assembly and the hydraulic assembly; the end, away from the upper connector, of the rubber sleeve assembly is fixedly connected with the cone, the slip assembly is located below the cone, and the end, away from the cone, of the slip assembly is connected with the transposition assembly. Mechanical and hydraulic composite setting is achieved, meanwhile, mechanical setting and hydraulic setting are independent of each other, working efficiency is guaranteed, operation risks are reduced, and economic losses caused by packer replacement due to setting failure are avoided.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development and completion technology, and in particular to a mechanical-hydraulic composite setting packer and its application method. Background Technology

[0002] A packer is a downhole tool installed in an oil and gas well to seal the annulus, isolate the target formation, control the injected or produced fluids, and withstand a certain pressure differential. Packers are generally classified according to their setting method into hydraulic setting, mechanical setting, and self-sealing or expansion packers.

[0003] Currently, in oil and gas wells with complex conditions such as lost circulation wells and ultra-deep wells, mechanical packer repositioning failures or hydraulic packer hydraulic system failures frequently occur, resulting in the packer being unable to set properly. This necessitates pulling out the tubing string to replace the packer, severely delaying operations, increasing operational risks, and causing significant economic losses.

[0004] Therefore, there is an urgent need to provide a mechanical-hydraulic composite setting packer and its usage method, which, compared with the existing technology, achieves mechanical and hydraulic composite setting, and the mechanical setting and hydraulic setting are independent of each other. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a mechanical-hydraulic composite setting packer and its usage method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A mechanical-hydraulic composite setting packer includes an upper connector, a central tube, a rubber sleeve assembly, a cone, a slip assembly, a shifting assembly, a hydraulic assembly, and a lower connector. The upper end of the central tube is connected to the upper connector, and the lower end of the central tube is connected to the lower connector. The rubber sleeve assembly, the cone, the slip assembly, the shifting assembly, and the hydraulic assembly are all sleeved outside the central tube. The lower end of the upper connector is connected to the rubber sleeve assembly. The end of the rubber sleeve assembly away from the upper connector is fixedly connected to the cone. The slip assembly is located below the cone, and the end of the slip assembly away from the cone is connected to the shifting assembly. The upper end of the hydraulic assembly extends into the interior of the shifting assembly.

[0008] Furthermore, the hydraulic assembly includes a hydraulic cylinder and a hydraulic piston, both of which are sleeved outside the central tube. The hydraulic cylinder is connected to the central tube, and the hydraulic piston is connected inside the hydraulic cylinder. The hydraulic piston extends into the interior of the switching assembly.

[0009] Furthermore, the hydraulic piston and the hydraulic cylinder are connected by a setting pin.

[0010] Furthermore, the hydraulic assembly also includes a second connecting cylinder, which is sleeved on the central tube and threadedly connected to the central tube. The second connecting cylinder is located between the central tube and the hydraulic cylinder, and the second connecting cylinder is connected to the hydraulic cylinder by a release pin.

[0011] Furthermore, the central tube is provided with a through hole, through which the central tube communicates with the interior of the hydraulic cylinder.

[0012] Furthermore, a locking ring is embedded in the inner wall of the hydraulic cylinder, and a rack portion is provided on the outer wall of the hydraulic piston. The rack portion extends into the interior of the locking ring, and the rack portion can only move upward relative to the locking ring.

[0013] Furthermore, the transposition assembly includes a transposition body and a transposition groove. The transposition body is sleeved on the outer wall of the central tube, and the transposition groove is provided inside the transposition body. The outer wall of the central tube is provided with a lug, and the lug is slidably connected in the transposition groove.

[0014] Furthermore, the transposition groove includes a short groove and a long groove that are connected, the short groove being located above the long groove, the long groove extending along the axial direction of the transposition body, and the short groove extending along the circumferential direction of the transposition body.

[0015] Furthermore, the slip assembly includes a support, multiple slips, and a first connecting cylinder. The support and the first connecting cylinder are both sleeved outside the central tube. The upper end of the support is connected to the multiple slips, and the lower end of the support is connected to the first connecting cylinder. The multiple slips are in contact with the cone, and the first connecting cylinder is connected to the transposition assembly.

[0016] Furthermore, the inner wall of the first connecting cylinder is provided with a plurality of grooves at the end away from the support, and the lower end of the grooves is an opening; the hydraulic piston includes a cylindrical part and a protrusion, the cylindrical part is connected to the hydraulic cylinder, and a plurality of the protrusions are provided at intervals along the circumference of the end of the cylindrical part away from the hydraulic cylinder;

[0017] When the lug is located in the short groove, the protrusion and the groove are staggered; when the lug is located in the long groove, the protrusion and the groove are correspondingly arranged.

[0018] Furthermore, the protrusion is provided with a relief groove, which extends along the axial direction of the protrusion, and the lug passes through the relief groove.

[0019] Furthermore, the rubber tube assembly includes a first rubber tube, a second rubber tube, and a spacer ring. There are two first rubber tubes, and the second rubber tube is disposed between the two first rubber tubes. The upper end of the second rubber tube is connected to the upper first rubber tube through the spacer ring, and the lower end of the second rubber tube is connected to the lower first rubber tube through the spacer ring. The upper first rubber tube is fixedly connected to the upper connector, and the lower first rubber tube is fixedly connected to the cone.

[0020] Furthermore, the first rubber tube is made of a rigid material, while the second rubber tube is made of an elastic material.

[0021] Furthermore, multiple second rubber tubes are provided, and adjacent second rubber tubes are connected by the spacer ring.

[0022] Furthermore, the outer wall of the cone near the slip assembly is a conical surface, and the outer diameter of the conical surface gradually decreases from the end away from the slip assembly to the end near the slip assembly.

[0023] A method of using a mechanical-hydraulic composite setting packer includes the following steps:

[0024] S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position.

[0025] S2. Perform mechanical setting: Rotate the central tube so that the lug is inside the long groove, lower the central tube, the second rubber sleeve expands radially and abuts against the inner wall of the sleeve, and the slip opens and anchors to the inner wall of the sleeve.

[0026] S3. Perform mechanical unsealing: Lift the central tube, the second rubber tube contracts radially, and the slip contracts; rotate the central tube so that the lug is located inside the short groove.

[0027] A method of using a mechanical-hydraulic composite setting packer includes the following steps:

[0028] S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position.

[0029] S2. Perform hydraulic setting: Rotate the center tube so that the lug is inside the long groove. Inject high-pressure fluid into the hydraulic cylinder. The setting pin is sheared by the high-pressure fluid. The hydraulic piston moves upward and applies an upward force to the slip. The slip opens and the second rubber sleeve expands radially. The hydraulic piston locks with the hydraulic cylinder and the high-pressure fluid flows out.

[0030] S3. Perform hydraulic unsealing: Lift the central tube, cut off the unsealing pin, and the central tube drives the second connecting cylinder to move relative to the hydraulic cylinder. The second rubber cylinder retracts radially, and the slip retracts.

[0031] A method of using a mechanical-hydraulic composite setting packer includes the following steps:

[0032] S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position.

[0033] S2. Perform mechanical setting: Rotate the central tube so that the lug is inside the long groove, lower the central tube, the second rubber sleeve expands radially and abuts against the inner wall of the sleeve, and the slip opens and anchors to the inner wall of the sleeve.

[0034] S3. Perform hydraulic setting: Inject high-pressure fluid into the hydraulic cylinder. The setting pin is sheared by the high-pressure fluid. The hydraulic piston moves upward and applies an upward force to the slip and the second rubber sleeve, increasing the opening angle of the slip and increasing the radial expansion of the second rubber sleeve. The hydraulic piston locks with the hydraulic cylinder, and the high-pressure fluid flows out.

[0035] S4. Unseal: Lift the central tube, the central tube moves relative to the hydraulic cylinder, the second rubber sleeve contracts radially, and the slip contracts.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] When the packer is set, the slip is subjected to forces from both the upper cone and the lower hydraulic piston. Similarly, the second sleeve is subjected to the combined forces of the cone and the hydraulic piston, thus providing double protection for the setting process. Furthermore, the mechanical and hydraulic setting methods are independent of each other. If one setting method fails, the other method can still ensure normal setting without replacing the packer. This ensures timely operation, reduces operational risks, and avoids the economic losses caused by packer replacement due to setting failure. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Upper connector; 2. Glue sleeve assembly; 21. First glue sleeve; 22. Second glue sleeve; 23. Spacer ring; 3. Cone; 4. Slip; 5. Support; 6. Central tube; 7. First connecting sleeve; 71. Groove; 8. Positioning pin; 9. Lug; 10. Shifting assembly; 101. Shifting body; 102. Shifting groove; 11. Hydraulic piston; 111. Cylindrical part; 112. Protrusion; 113. Relief groove; 114. Rack part; 12. Hydraulic cylinder; 13. Sealing pin; 14. Unsealing pin; 15. Lower connector; 16. Second connecting sleeve; 17. Locking ring. Detailed Implementation

[0041] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment provides a mechanical-hydraulic composite setting packer, including an upper connector 1, a central tube 6, a rubber sleeve assembly 2, a cone 3, a slip assembly, a transposition assembly 10, a hydraulic assembly, and a lower connector 15. The upper end of the central tube 6 is connected to the upper connector 1, and the lower end of the central tube 6 is connected to the lower connector 15. The end of the upper connector 1 furthest from the central tube 6 (the upper end of the upper connector 1) is connected to the completion tubing string. The lower end of the upper connector 1 has a metric thread, and the lower end of the upper connector 1 is connected to the central tube 6 through the metric thread. The rubber sleeve assembly 2, cone 3, slip assembly, and transposition assembly 10 are also included. 0. All hydraulic components are sleeved on the outside of the central tube 6; the upper end of the rubber sleeve assembly 2 is fixedly connected to the lower end of the upper connector 1, and the lower end of the rubber sleeve assembly 2 is fixedly connected to the cone 3. The cone 3 and the rubber sleeve assembly 2 are movably connected to the central tube 6; a slip assembly is set below the cone 3, and a shifting assembly 10 is connected below the slip assembly. The shifting assembly 10 is slidably connected to the central tube 6. The slip assembly and the shifting assembly 10 slide together relative to the central tube 6. The upper end of the hydraulic component extends into the interior of the shifting assembly 10 through the lower end of the shifting assembly 10. The hydraulic component is used to drive the slip assembly to set.

[0044] The rubber sleeve assembly 2 includes a first rubber sleeve 21, a second rubber sleeve 22, and a spacer ring 23. There are two first rubber sleeves 21, and a second rubber sleeve 22 is disposed between the two first rubber sleeves 21. The upper end of the second rubber sleeve 22 is connected to the upper first rubber sleeve 21 through the spacer ring 23, and the lower end of the second rubber sleeve 22 is also connected to the lower second rubber sleeve 22 through the spacer ring 23. The first rubber sleeve 21, the second rubber sleeve 22, and the spacer ring 23 are all sleeved on the outer wall of the central tube 6. Multiple second rubber sleeves 22 can also be disposed between the two first rubber sleeves 21 (this structure is not shown in the figure). Adjacent second rubber sleeves 22 are connected by spacer rings 23. The first rubber sleeve 21 is made of rigid material, and the second rubber sleeve 22 is made of elastic material. During setting, the second rubber sleeve 22 expands radially under the action of axial pressure, filling the gap between the rubber sleeve assembly 2 and the inner wall of the sleeve, and playing a sealing role. The first rubber sleeves 21 on both sides of the second rubber sleeve 22 play a supporting role for the second rubber sleeve 22.

[0045] The first rubber tube 21 located below is fixedly connected to the cone 3 at the end away from the second rubber tube 22. The side wall of the central tube 6 is provided with a sliding groove along its axis. The inner wall of the cone 3 is integrally connected to the slider, which is slidably connected inside the sliding groove to limit the sliding of the cone 3. The structure of the sliding groove and the slider is not shown in the figure. The outer wall of the cone 3 is tapered at the end near the slip assembly. The outer diameter of the tapered surface gradually decreases from the end away from the slip assembly to the end near the slip assembly.

[0046] The slip assembly includes a support 5, multiple slips 4, and a first connecting cylinder 7. The support 5 is sleeved on the outer wall of the central tube 6. Multiple slips 4 are connected to the upper end of the support 5. The multiple slips 4 are distributed circumferentially along the support 5. The inner sidewalls of all slips 4 are in contact with the conical surface of the cone 3. When the slips 4 move upward or the cone 3 moves downward, the slips 4 will be opened under the action of the cone 3, thereby anchoring the packer provided in this embodiment to the inner wall of the sleeve. Preferably, 6 slips 4 are provided. The first connecting cylinder 7 is located below the support 5. The first connecting cylinder 7 is connected to the support 5 by threads. The first connecting cylinder 7 is composed of two semi-cylinders. The two semi-cylinders are sleeved on the outer wall of the central tube 6 and are in contact with each other. Both of the two semi-cylinders are connected to the support 5 by threads. The lower end of the inner wall of the first connecting cylinder 7 is provided with multiple grooves 71 with lower openings. The multiple grooves 71 are distributed at the lower end of the inner wall of the two semi-cylinders.

[0047] The transposition assembly 10 includes a transposition body 101, a transposition groove 102, and a positioning pin 8. The transposition body 101 is sleeved on the outside of the central tube 6. The upper end of the transposition body 101 is connected to the first connecting cylinder 7 via the positioning pin 8. The inner wall of the transposition body 101 is provided with a transposition groove 102. The transposition groove 102 is L-shaped and includes a long groove and a short groove that are connected. The long groove extends axially along the transposition body 101, and the short groove extends circumferentially along the transposition body 101. The short groove is located at the upper end of the long groove. Figure 1 The transposition groove 102 shown in the figure is a long groove structure; the short groove structure is not shown in the figure. A lug 9 is integrally connected to the outer wall of the central tube 6. The lug 9 is slidably connected within the transposition groove 102. When the lug 9 is in the short groove, the central tube 6 is locked to the slip assembly, and the central tube 6 cannot move up or down relative to the slip assembly. When the lug 9 is in the long groove, the central tube 6 is unlocked from the slip assembly, and the central tube 6 can move up and down relative to the slip assembly.

[0048] The hydraulic assembly includes a hydraulic cylinder 12, a hydraulic piston 11, a second connecting cylinder 16, a setting pin 13, and a releasing pin 14. The hydraulic cylinder 12 is sleeved on the outer wall of the central tube 6, and the second connecting cylinder 16 is also sleeved on the outer wall of the central tube 6. The outer wall of the second connecting cylinder 16 contacts the inner wall of the hydraulic cylinder 12. The second connecting cylinder 16 is located at the lower end of the inner wall of the hydraulic cylinder 12 and is threadedly connected to the central tube 6. The hydraulic cylinder 12 and the second connecting cylinder 16 are connected by the releasing pin 14. When the releasing pin 14 is sheared, the central tube 6 can only move upward relative to the hydraulic cylinder 12. The hydraulic piston 11 includes a cylindrical portion 111 and multiple protrusions 112. The cylindrical portion 111 of the hydraulic piston 11 is connected by a setting pin 13 and a releasing pin 14. The sealing pin 13 is connected to the hydraulic cylinder 12. The protrusion 112 of the hydraulic piston 11 is positioned away from the hydraulic cylinder 12. Multiple protrusions 112 are provided on the hydraulic piston 11, spaced apart circumferentially along the cylindrical portion 111. When the sealing pin 13 shears, the hydraulic piston 11 can slide relative to the hydraulic cylinder 12. When the lug 9 is located in the short groove, the protrusion 112 of the hydraulic piston 11 is staggered with the groove 71 of the first connecting cylinder 7. When the lug 9 is located in the long groove, the protrusion 112 of the hydraulic piston 11 corresponds to the groove 71 of the first connecting cylinder 7. The shape of the groove 71 of the first connecting cylinder 7 is adapted to the end face shape of the protrusion 112 of the hydraulic piston 11. The protrusion 112 of the hydraulic piston 11 is provided with a relief groove 113, which extends axially along the hydraulic piston 11. The lug 9 passes through the relief groove 113. When the hydraulic piston 11 moves relative to the hydraulic cylinder 12, the lug 9 will not obstruct the movement of the hydraulic piston 11. The outer wall of the cylindrical part 111 is provided with a rack part 114. The inner wall of the hydraulic cylinder 12 is embedded with a locking ring 17, which is located below the seat pin 13. The rack part 114 extends into the locking ring 17, and the locking ring 17 locks with the rack part 114. The locking ring 17 is set so that the rack part 114 can only move upward relative to the locking ring 17. The locking principle of the locking ring 17 and the rack part 114 is similar to self-locking. The locking principle of the self-locking nylon cable tie is the same. (The self-locking nylon cable tie includes a pawl inside the head of the cable tie and a serrated rack on the nylon strap. The pawl inside the head of the cable tie is designed to be inclined, so that when the nylon strap is tightened, the serrations on the strap and the pawl engage with each other. When the nylon strap is tightened, the pawl tightly grips the serrations to prevent the strap from slipping back, thus forming a self-locking mechanism.) Therefore, the inner wall of the locking ring 17 is provided with a pawl, and the rack part 114 is a serrated rack, so that the rack part 114 can move upward relative to the locking ring 17, but the rack part 114 cannot move downward relative to the locking ring 17. The central tube 6 is provided with a through hole that communicates with the hydraulic cylinder 12, and the high-pressure liquid inside the hydraulic cylinder 12 flows in and out through the through hole.

[0049] O-rings are used to seal the connection between the upper connector 1 and the completion tubing, and between the upper connector 1 and the central tube 6; O-rings are also used to seal the connection between the lower connector 15 and the central tube 6.

[0050] The working principle of the mechanical-hydraulic composite setting packer provided in this embodiment is as follows: The upper end of the upper connector 1 is connected to the completion string. The completion string and the packer provided in this embodiment are placed into the casing and lowered. After being lowered to the set position, the central tube 6 is rotated so that the lug 9 provided on the central tube 6 is located inside the long groove. Then the central tube 6 is lowered. The rubber sleeve assembly 2 and the cone 3 move downward together with the central tube 6. The cone 3 is blocked by the slip assembly and squeezes the rubber sleeve assembly 2, causing the second rubber sleeve 22 to expand radially and perform sealing. At the same time, the slip 4 is opened under the reaction force of the cone 3 and anchored on the inner wall of the casing to complete the mechanical setting. When the central tube 6 is lifted, the slip 4 contracts and the second rubber sleeve 22 contracts radially, realizing mechanical unsealing. High-pressure fluid is injected into the hydraulic cylinder 12. After entering the hydraulic cylinder 12 through the through hole, the high-pressure fluid exerts an upward force on the hydraulic piston 11, shearing the setting pin 13. The hydraulic piston 11 moves upward, and the protrusion 112 of the hydraulic piston 11 extends into the groove 71 of the first connecting cylinder 7, pushing the slip assembly upward and applying an upward force to the slip 4. After the hydraulic piston 11 abuts against the groove 71 of the first connecting cylinder 7, the high-pressure fluid flows out. The hydraulic piston 11 and the hydraulic cylinder 12 are locked by the locking ring 17 and the rack portion 114, completing the hydraulic setting. During hydraulic unsealing, the central tube is lifted. 6. The central tube 6 drives the rubber sleeve assembly 2 and the cone 3 to move upward. The second rubber sleeve 22 contracts radially, the slip 4 contracts, and the central tube 6 simultaneously drives the second connecting sleeve 16 to move upward. The unsealing pin 14 is sheared, and the second connecting sleeve 16 moves upward synchronously with the central tube 6. The hydraulic piston 11 and the hydraulic cylinder 12 are locked together and remain in the same position after setting. The distance between the second connecting sleeve 16 and the hydraulic piston 11 becomes smaller and smaller. The hydraulic piston 11 leaves the groove 71 of the first connecting sleeve 7, realizing hydraulic unsealing. When the two setting methods are used together, mechanical setting is performed first and then hydraulic setting is performed. Unsealing is performed simultaneously.

[0051] In this embodiment, during the setting process, the slip 4 experiences both the force exerted by the upper cone 3 and the force exerted by the lower hydraulic piston 11. Similarly, the second rubber sleeve 22 experiences the combined forces of the cone 3 and the hydraulic piston 11, thus providing double protection for the setting process. Furthermore, the mechanical and hydraulic setting methods are independent of each other. If any one setting method fails, the other method can still ensure normal setting without replacing the packer, ensuring timely operation, reducing operational risks, and avoiding the economic losses caused by packer replacement due to setting failure.

[0052] Example 2

[0053] This embodiment provides a method for using a mechanical-hydraulic composite setting packer, which is based on a mechanical-hydraulic composite setting packer provided in Embodiment 1, and specifically includes the following steps:

[0054] S1. Connect the completion string to the upper connector 1, and lower the connected assembly into the casing at the set position.

[0055] S2. Perform mechanical setting: Rotate the central tube 6 so that the lug 9 is inside the long groove, lower the central tube 6, the second rubber sleeve 22 expands radially and abuts against the inner wall of the sleeve, and the slip 4 opens and anchors to the inner wall of the sleeve.

[0056] S3. Perform mechanical unsealing: Lift the central tube 6, the second rubber cylinder 22 contracts radially, and the slip 4 contracts; rotate the central tube 6 so that the lug 9 is located inside the short groove.

[0057] Example 3

[0058] This embodiment provides a method for using a mechanical-hydraulic composite setting packer, which is based on a mechanical-hydraulic composite setting packer provided in Embodiment 1, and specifically includes the following steps:

[0059] S1. Connect the completion string to the upper connector 1, and lower the connected assembly into the casing at the set position.

[0060] S2. Perform hydraulic setting: Rotate the center tube 6 so that the lug 9 is inside the long groove. Inject high-pressure fluid into the hydraulic cylinder 12. The setting pin 13 is sheared by the high-pressure fluid. The hydraulic piston 11 moves upward and applies an upward force to the slip 4. The slip 4 is opened and the second rubber sleeve 22 expands radially. The hydraulic piston 11 is locked with the hydraulic cylinder 12 and the high-pressure fluid flows out.

[0061] S3. Perform hydraulic unsealing: Lift the central tube 6, cut off the unsealing pin 14, move the central tube 6 relative to the hydraulic cylinder 12, separate the hydraulic piston 11 from the first connecting cylinder 7, the second rubber cylinder 22 retracts radially, the slip 4 retracts, and the hydraulic unsealing is completed.

[0062] Example 4

[0063] This embodiment provides a method for using a mechanical-hydraulic composite setting packer, which is based on a mechanical-hydraulic composite setting packer provided in Embodiment 1, and specifically includes the following steps:

[0064] S1. Connect the completion string to the upper connector 1, and lower the connected assembly into the casing at the set position.

[0065] S2. Perform mechanical setting: Rotate the central tube 6 so that the lug 9 is inside the long groove, lower the central tube 6, the second rubber sleeve 22 expands radially and abuts against the inner wall of the sleeve, and the slip 4 opens and anchors to the inner wall of the sleeve.

[0066] S3. Perform hydraulic setting: Inject high-pressure fluid into the hydraulic cylinder 12. The setting pin 13 is sheared by the high-pressure fluid. The hydraulic piston 11 moves upward and applies an upward force to the slip 4, increasing the opening angle of the slip 4 and increasing the radial expansion of the second rubber sleeve 22. The hydraulic piston 11 locks with the hydraulic cylinder 12, and the high-pressure fluid flows out.

[0067] S4. Unsealing: Lift the central tube 6, the central tube 6 moves relative to the hydraulic cylinder 12, the hydraulic piston 11 separates from the first connecting cylinder 7, the second rubber cylinder 22 retracts radially, and the slip 4 retracts.

[0068] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A mechanical-hydraulic composite setting packer, characterized in that, The device includes an upper connector, a central tube, a rubber sleeve assembly, a cone, a slip assembly, a shifting assembly, a hydraulic assembly, and a lower connector. The upper end of the central tube is connected to the upper connector, and the lower end of the central tube is connected to the lower connector. The rubber sleeve assembly, the cone, the slip assembly, the shifting assembly, and the hydraulic assembly are all sleeved on the outside of the central tube. The lower end of the upper connector is connected to the rubber sleeve assembly. The end of the rubber sleeve assembly away from the upper connector is fixedly connected to the cone. The slip assembly is located below the cone, and the end of the slip assembly away from the cone is connected to the shifting assembly. The upper end of the hydraulic assembly extends into the shifting assembly.

2. The mechanical-hydraulic composite setting packer according to claim 1, characterized in that, The hydraulic assembly includes a hydraulic cylinder and a hydraulic piston. Both the hydraulic cylinder and the hydraulic piston are sleeved outside the central tube. The hydraulic cylinder is connected to the central tube, and the hydraulic piston is connected inside the hydraulic cylinder. The hydraulic piston extends into the interior of the transposition assembly.

3. The mechanical-hydraulic composite setting packer according to claim 2, characterized in that, The hydraulic piston and the hydraulic cylinder are connected by a setting pin.

4. The mechanical-hydraulic composite setting packer according to claim 2, characterized in that, The hydraulic assembly further includes a second connecting cylinder, which is sleeved on the central tube and threadedly connected to the central tube. The second connecting cylinder is located between the central tube and the hydraulic cylinder, and the second connecting cylinder is connected to the hydraulic cylinder by a release pin.

5. The mechanical-hydraulic composite setting packer according to claim 4, characterized in that, The central tube has a through hole, through which the central tube communicates with the interior of the hydraulic cylinder.

6. The mechanical-hydraulic composite setting packer according to claim 2, characterized in that, The hydraulic cylinder has a locking ring embedded in its inner wall, and the hydraulic piston has a rack on its outer wall. The rack extends into the locking ring and can only move upward relative to the locking ring.

7. A mechanical-hydraulic composite setting packer according to claim 2, characterized in that, The transposition assembly includes a transposition body and a transposition groove. The transposition body is sleeved on the outer wall of the central tube, and the transposition groove is provided inside the transposition body. The outer wall of the central tube is provided with a lug, which is slidably connected in the transposition groove.

8. The mechanical-hydraulic composite setting packer according to claim 7, characterized in that, The transposition groove includes a short groove and a long groove that are connected. The short groove is located above the long groove. The long groove extends along the axial direction of the transposition body, and the short groove extends along the circumferential direction of the transposition body.

9. A mechanical-hydraulic composite setting packer according to claim 8, characterized in that, The slip assembly includes a support, multiple slips, and a first connecting cylinder. The support and the first connecting cylinder are both sleeved on the outside of the central tube. The upper end of the support is connected to the multiple slips, and the lower end of the support is connected to the first connecting cylinder. The multiple slips are in contact with the cone, and the first connecting cylinder is connected to the transposition assembly.

10. A mechanical-hydraulic composite setting packer according to claim 9, characterized in that, The inner wall of the first connecting cylinder is provided with a plurality of grooves at the end away from the support, and the lower end of the grooves is an opening; the hydraulic piston includes a cylindrical part and a protrusion, the cylindrical part is connected to the hydraulic cylinder, and a plurality of the protrusions are provided at intervals along the circumference of the end of the cylindrical part away from the hydraulic cylinder; When the lug is located in the short groove, the protrusion and the groove are staggered; when the lug is located in the long groove, the protrusion and the groove are correspondingly arranged.

11. A mechanical-hydraulic composite setting packer according to claim 10, characterized in that, The protrusion is provided with a relief groove, which extends along the axial direction of the protrusion, and the lug passes through the relief groove.

12. The mechanical-hydraulic composite setting packer according to claim 1, characterized in that, The rubber tube assembly includes a first rubber tube, a second rubber tube, and a spacer ring. There are two first rubber tubes, and the second rubber tube is disposed between the two first rubber tubes. The upper end of the second rubber tube is connected to the upper first rubber tube through the spacer ring, and the lower end of the second rubber tube is connected to the lower first rubber tube through the spacer ring. The upper first rubber tube is fixedly connected to the upper connector, and the lower first rubber tube is fixedly connected to the cone.

13. A mechanical-hydraulic composite setting packer according to claim 12, characterized in that, The first rubber tube is made of a rigid material, and the second rubber tube is made of an elastic material.

14. A mechanical-hydraulic composite setting packer according to claim 12, characterized in that, The second rubber tube is provided in multiple ways, and two adjacent second rubber tubes are connected by the spacer ring.

15. A mechanical-hydraulic composite setting packer according to claim 1, characterized in that, The outer wall of the cone is tapered at the end near the slip assembly, and the outer diameter of the tapered surface gradually decreases from the end away from the slip assembly to the end near the slip assembly.

16. A method of using the mechanical-hydraulic composite setting packer according to any one of claims 1-15, characterized in that, The following steps are involved: S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position. S2. Perform mechanical setting: Rotate the central tube so that the lug is inside the long groove, lower the central tube, the second rubber sleeve expands radially and abuts against the inner wall of the sleeve, and the slip opens and anchors to the inner wall of the sleeve. S3. Perform mechanical unsealing: Lift the central tube, the second rubber tube contracts radially, and the slip contracts; rotate the central tube so that the lug is located inside the short groove.

17. A method of using the organic-hydraulic composite setting packer according to any one of claims 1-15, characterized in that, The following steps are involved: S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position. S2. Perform hydraulic setting: Rotate the center tube so that the lug is inside the long groove. Inject high-pressure fluid into the hydraulic cylinder. The setting pin is sheared by the high-pressure fluid. The hydraulic piston moves upward and applies an upward force to the slip. The slip opens and the second rubber sleeve expands radially. The hydraulic piston locks with the hydraulic cylinder and the high-pressure fluid flows out. S3. Perform hydraulic unsealing: Lift the central tube, cut off the unsealing pin, and the central tube drives the second connecting cylinder to move relative to the hydraulic cylinder. The second rubber cylinder retracts radially, and the slip retracts.

18. A method of using the mechanical-hydraulic composite setting packer according to any one of claims 1-15, characterized in that, The following steps are involved: S1. Connect the completion string to the upper connector and lower the connected assembly into the casing at the set position. S2. Perform mechanical setting: Rotate the central tube so that the lug is inside the long groove, lower the central tube, the second rubber sleeve expands radially and abuts against the inner wall of the sleeve, and the slip opens and anchors to the inner wall of the sleeve. S3. Perform hydraulic setting: Inject high-pressure fluid into the hydraulic cylinder. The setting pin is sheared by the high-pressure fluid. The hydraulic piston moves upward and applies an upward force to the slip and the second rubber sleeve, increasing the opening angle of the slip and increasing the radial expansion of the second rubber sleeve. The hydraulic piston locks with the hydraulic cylinder, and the high-pressure fluid flows out. S4. Unseal: Lift the central tube, the central tube moves relative to the hydraulic cylinder, the second rubber sleeve contracts radially, and the slip contracts.

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