Recyclable anchoring packer for windowing of multilateral well

Abstract

The recoverable anchoring packer for windowing of the multilateral well comprises a mandrel, the two ends of the mandrel are in threaded connection with an upper connector and a lower connector, and the portion, between the upper connector and the lower connector, of the mandrel is sequentially sleeved with an upper sliding groove, a lower sliding groove, a rubber sleeve supporting base, a sleeve and a shearing ring; an anchoring slip is arranged between the upper sliding groove and the lower sliding groove, and a guide rail sliding way of the anchoring slip is matched with guide rail sliding ways of the upper sliding groove and the lower sliding groove. A rubber sleeve assembly is arranged at the upper end of the rubber sleeve supporting seat; a fixing sleeve is arranged in the sleeve and seals an annular space between the sleeve and the mandrel; a release ring is arranged below the fixing sleeve in the sleeve, the release ring is connected with the sleeve through an unblocking pin, a lock ring is arranged between the release ring and the mandrel, and the lock ring is connected with the release ring and the mandrel through self-locking threads; and the shearing ring is connected with the lower joint through a setting pin. The device is simple in mechanical structure, stable in function and reliable in anchoring force; after sidetrack drilling operation is finished, the tool can be recycled, and follow-up well completion operation is not affected.

Description

Technical Field

[0001] This invention relates to the field of downhole tools for oil wells, and particularly to a retrievable anchor packer for opening windows in branch wells. Background Technology

[0002] Sidetracking packers are a crucial auxiliary tool in sidetracking operations, primarily used to prevent the directional drilling rig from shifting downwards during the process. Conventional sidetracking packers are mostly non-recoverable, which has several drawbacks: 1. They lack the function of sealing the casing annulus, allowing cuttings generated during sidetracking operations to fall into the main wellbore and contaminate the reservoir; 2. After the operation, the tool cannot be recovered, hindering subsequent well completion operations; 3. Non-recoverable packers are disposable products, making them uneconomical. Therefore, developing a recoverable packer for sidetracking wells is of paramount importance. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a retrievable anchor packer for opening windows in branch wells.

[0004] The present invention is achieved by the following technical solution.

[0005] A recyclable anchor packer for branch well opening includes a mandrel with an upper connector and a lower connector threaded to both ends. An upper sliding groove, a lower sliding groove, a rubber sleeve support, a sleeve, and a shear ring are sequentially fitted onto the mandrel between the upper and lower connectors. An anchoring slip is provided between the upper and lower sliding grooves, and the guide rail of the anchoring slip mates with the guide rails of the upper and lower sliding grooves. A rubber sleeve assembly is provided at the upper end of the rubber sleeve support. A fixed sleeve is provided inside the sleeve, sealing the annular space between the sleeve and the mandrel. A release ring is provided below the fixed sleeve inside the sleeve, connected to the sleeve by a release pin. A locking ring is provided between the release ring and the mandrel, connected to both the release ring and the mandrel by a self-locking thread. The shear ring is connected to the lower connector by a setting pin.

[0006] Furthermore, the lower end of the upper connector is provided with a spline groove and a spline, and the upper end of the upper sliding groove is also provided with a spline groove and a spline. The upper connector and the upper sliding groove cooperate with each other through the spline groove and the spline.

[0007] Furthermore, a limiting ring is fitted on the upper part of the outer wall of the mandrel, and a step is provided inside the lower end of the upper sliding groove, with the step abutting against the limiting ring.

[0008] Furthermore, a disc spring is provided between the upper connector and the upper sliding groove.

[0009] Furthermore, the sliding groove is connected to the mandrel via a sliding groove shear pin; an annular groove is provided inside the lower end of the sliding groove.

[0010] Furthermore, the rubber sleeve support and the sleeve, as well as the sleeve and the shearing ring, are connected by threads and fixed by fixing pins.

[0011] Furthermore, the retaining sleeve is connected to the spindle via threads and retaining pins.

[0012] Furthermore, an anti-rotation pin is provided between the locking ring and the release ring.

[0013] Furthermore, a plug is provided at the lower end of the lower connector.

[0014] This application has the following beneficial effects: (1) The mechanical structure is simple, the function is stable, and the anchoring force is reliable; (2) After the side drilling operation is completed, the tools can be recovered without affecting the subsequent well completion operation; (3) It can be used repeatedly, reducing costs and having good economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] The components are as follows: 1. Upper connector; 2. Mandrel; 3. Sealing ring; 4. Disc spring; 5. Upper slide groove; 6. Limiting ring; 7. Elastic washer; 8. Limiting bolt; 9. Anchoring slip; 10. Lower slide groove; 11. Lower slide groove shearing pin; 12. Glue tube assembly; 13. Glue tube support; 14. Fixing pin; 15. Sleeve; 16. Fixing sleeve; 17. Release ring; 18. Unsealing pin; 19. Locking ring; 20. Anti-rotation pin; 21. Shearing ring; 22. Setting pin; 23. Lower connector; 24. Plug. Detailed Implementation

[0017] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0018] like Figure 1 As shown, a recyclable anchor packer for opening windows in branch wells mainly includes an upper connector 1, a mandrel 2, a sealing ring 3, a disc spring 4, an upper sliding groove 5, a limiting ring 6, an elastic washer 7, a limiting bolt 8, an anchoring slip 9, a lower sliding groove 10, a lower sliding groove shearing pin 11, a rubber sleeve assembly 12, a rubber sleeve support 13, a fixing pin 14, a sleeve 15, a fixing sleeve 16, a release ring 17, an unsealing pin 18, a locking ring 19, an anti-rotation pin 20, a shearing ring 21, a setting pin 22, a lower connector 23, and a plug 24.

[0019] The upper connector 1 has drill pipe threads at its upper end for connecting with other side-drilling branch well tubing tools. The upper connector 1 has a through hole, a step, and connecting threads inside. The through hole is used for fluid pressure transmission, the step has a sealing surface for forming a seal with the mandrel 2, and the threads are used for connection with the mandrel 2. The lower end of the upper connector 1 has a spline groove and an annular groove. The spline groove is used for spline engagement with the upper sliding groove 5, and the annular groove is used to house the disc spring 4. The stepped surface of the annular groove is used to compress the disc spring 4.

[0020] The mandrel 2 has a central through hole for liquid pressure transmission. The upper end of the mandrel 2 has a sealing groove and threads. The sealing groove is for installing a sealing ring 3, forming a seal with the upper connector 1. The threads are for connecting to the upper connector 1. The upper part of the outer wall of the mandrel 2 has an annular groove for placing a limiting retaining ring 6 to prevent the upper sliding groove 5 from moving downwards. The middle part of the mandrel 2 has a shearing groove and a pressure transmission hole. The shearing groove is for placing and shearing the lower sliding groove shearing pin 11. The pressure transmission hole is for liquid pressure transmission, pushing the rubber sleeve support 13 upwards. The lower part of the mandrel 2 has a one-way self-locking thread to prevent the release ring 17 and locking ring 19 from retracting downwards. The lower end of the mandrel 2 has a sealing groove and threads. The sealing groove is for installing a sealing ring 3, forming a seal with the lower connector 23. The threads are for connecting to the lower connector 23.

[0021] The upper sliding groove 5 has a through hole for inserting the mandrel 2. The upper end of the upper sliding groove 5 has a spline groove and an annular groove. The spline groove mates with the spline of the upper connector 1, and the annular groove houses the disc spring 4. The stepped surface of the annular groove compresses the disc spring 4. The lower end of the upper sliding groove 5 has an inclined guide rail track to guide the movement of the anchoring slip 9. The lower end of the upper sliding groove 5 has a step that abuts against the limiting ring 6, preventing the upper sliding groove 5 from moving downwards. The lower end face of the upper sliding groove 5 has a threaded hole for installing the limiting bolt 8. When installing the limiting bolt 8, an elastic washer 7 is installed between the limiting bolt 8 and the upper sliding groove 5. The limiting bolt 8 prevents the lower sliding groove 10 from contacting the upper sliding groove 5 when it moves upwards, thus preventing the anchoring slip 9 from falling off.

[0022] The anchor slip 9 has guide rails on its front and rear sidewalls, which are used to cooperate with the upper sliding groove 5 and the lower sliding groove 10 guide rails for movement. The anchor slip 9 has pyramid teeth on its surface for anchoring the casing during downhole operations, achieving a seated position.

[0023] The upper end of the sliding groove 10 is provided with a vertical guide rail slide for cooperating with the guide rail slide of the anchoring slip 9 to transmit the mounting thrust. A threaded hole is provided in the middle of the sliding groove 10 for installing the sliding groove shear pin 11 to prevent the sliding groove 10 from moving upwards during tool lowering and to prevent the anchoring slip 9 from extending prematurely. A through hole is provided inside the sliding groove 10 for the mandrel 2 to pass through. An annular groove is provided inside the lower end of the sliding groove 10 to provide displacement space for the rubber sleeve support 13.

[0024] The upper outer side of the rubber tube support 13 is provided with a long step for placing the rubber tube assembly 12. The outer wall of the middle part of the rubber tube support 13 is provided with a pin groove and a sealing groove. The pin groove is used to install and fix the pin 14 to prevent the sleeve 15 from interlocking with the rubber tube support 13. The sealing groove is used to install the sealing ring 3 to ensure a seal between the rubber tube support 13 and the sleeve 15. The lower outer side of the rubber tube support 13 is provided with threads for connecting the sleeve 15.

[0025] The upper end of the sleeve 15 is provided with a fixing pin hole, a sealing surface, and threads. The fixing pin hole is used to install the fixing pin 14 to prevent the rubber tube support 13 and the sleeve 15 from buckling. The sealing surface is used to form a seal with the rubber tube support 13, and the threads are used to connect the rubber tube support 13. The upper middle part of the inner wall of the sleeve 15 is provided with a sealing surface to form a seal with the fixing sleeve 16. The middle part of the sleeve 15 is provided with several evenly distributed vent holes and pin holes. The vent holes are used to vent air, and the pin holes are used to install the release pin 18. The lower end of the sleeve 15 is provided with threads and a fixing pin hole. The threads are used to connect the shear ring 21, and the fixing pin hole is used to install the fixing pin 14 to prevent the shear ring 21 and the sleeve 15 from buckling.

[0026] The upper end of the fixed sleeve 16 is provided with sealing grooves on both the inner and outer sides for installing sealing rings 3, which form a seal with the sleeve 15 and the mandrel 2 respectively. The lower end of the fixed sleeve 16 is provided with threads and fixing pin holes. The threads are used to connect the mandrel 2, and the fixing pin holes are used to install fixing pins 14 to prevent the fixed sleeve 16 and the mandrel 2 from being reversed.

[0027] The upper end of the release ring 17 is provided with a pointed annular groove for placing and shearing the release pin 18. The middle part of the release ring 17 is provided with a countersunk pin hole for installing the anti-rotation pin 20 to prevent the locking ring 19 from rotating. The release ring 17 is provided with a one-way self-locking thread inside to prevent the locking ring 19 and the release ring 17 from retracting.

[0028] The locking ring 19 is provided with one-way self-locking threads on both the inner and outer sides. The outer thread is used to prevent the release ring 17 and the locking ring 19 from retracting, and the inner thread is used to prevent the spindle 2 and the locking ring 19 from retracting, thereby ensuring that the release ring 17 can only move upward relative to the spindle 2, and there will be no retraction between the two.

[0029] The upper end of the shear ring 21 is threaded for connecting the sleeve 15, and the lower end is provided with several evenly distributed setting pin holes for installing setting pins 22.

[0030] The upper end of the lower connector 23 has a pointed annular groove for placing and shearing the setting pin 22. The upper end of the lower connector 23 has threads and a step, and a through hole. The threads are used to connect to the mandrel 2, the step is used to abut against the lower end of the mandrel 2, and the step has a sealing surface to form a seal with the mandrel 2. The through hole is used to vent air when liquid flows through. The lower end has a countersunk tapered threaded hole for installing the plug 24.

[0031] This invention is mainly used in sidetracking operations for branch wells with casing. During the operation, the tool is activated by hydraulic thrust. When the hydraulic thrust is constant, the sliding groove shear pin 11 and the setting pin 22 are sheared. Under the action of the self-locking mechanism, the sleeve 15 can only move upward, thereby pushing the rubber sleeve support 13, rubber sleeve assembly 12, sliding groove 10, and anchoring slip 9 upward. Finally, the anchoring slip 9 sits on the inner wall of the casing, and the rubber sleeve assembly 12 seals the casing annulus. When the sidetracking operation for the branch well is completed and the anchor needs to be retrieved, the tubing string is lifted. When the lifting force is constant, the unsealing pin 18 is sheared, the self-locking mechanism fails, and the anchoring slip 9 can retract radially under the action of the casing, thereby detaching from the casing and realizing the retrieval function. When the anchoring slip 9 retracts radially, the sliding groove 10, rubber sleeve assembly 12, rubber sleeve support 13, sleeve 15, and shearing ring 21 all move downward. The tool has reliable anchoring capability, and the invention can be retrieved after window drilling operations are completed, allowing for continued well completion operations. Furthermore, the invention can be reused multiple times, offering good economic efficiency.

[0032] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A recyclable anchor packer for opening windows in branch wells, characterized in that: The device includes a mandrel (2), with an upper connector (1) and a lower connector (23) threaded to both ends of the mandrel (2). An upper sliding groove (5), a lower sliding groove (10), a rubber sleeve support (13), a sleeve (15), and a shear ring (21) are sequentially fitted onto the mandrel (2) between the upper connector (1) and the lower connector (23). An anchoring slip (9) is provided between the upper sliding groove (5) and the lower sliding groove (10), and the guide rail of the anchoring slip (9) cooperates with the guide rail of the upper sliding groove (5) and the lower sliding groove (10). A rubber sleeve assembly (1) is provided at the upper end of the rubber sleeve support (13). 2); The sleeve (15) is provided with a fixed sleeve (16), which seals the annular space between the sleeve (15) and the spindle (2); A release ring (17) is provided below the fixed sleeve (16) in the sleeve (15), and the release ring (17) is connected to the sleeve (15) by a release pin (18). A locking ring (19) is provided between the release ring (17) and the spindle (2), and the locking ring (19) is connected to the release ring (17) and the spindle (2) respectively by a self-locking thread; The shearing ring (21) is connected to the lower connector (23) by a setting pin (22).

2. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The lower end of the upper connector (1) is provided with a spline groove and a spline, and the upper end of the upper slide groove (5) is also provided with a spline groove and a spline. The upper connector (1) and the upper slide groove (5) cooperate with each other through the spline groove and spline.

3. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The upper part of the outer wall of the mandrel (2) is fitted with a limiting ring (6), and the lower end of the upper sliding groove (5) is provided with a step, which abuts against the limiting ring (6).

4. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: A disc spring (4) is provided between the upper connector (1) and the upper slide groove (5).

5. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The sliding groove (10) is connected to the spindle (2) through the sliding groove shear pin (11); the lower end of the sliding groove (10) is provided with an annular groove.

6. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The rubber sleeve support (13) and the sleeve (15) are connected by threads, and the sleeve (15) is connected to the shear ring (21) by a fixing pin (14).

7. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The fixing sleeve (16) is connected to the spindle (2) by threads and fixing pins (14).

8. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: An anti-rotation pin (20) is provided between the locking ring (19) and the release ring (17).

9. A recyclable anchor packer for opening windows in branch wells according to claim 1, characterized in that: The lower end of the lower connector (23) is provided with a plug (24).

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