All-angle slip packer with multiple deblocking modes

Abstract

The full-angle slip packer comprises a central pipe, a full-angle slip bowl, an anchoring claw, an anchor and an upper connector, the full-angle slip bowl is arranged on the outer side face of the central pipe, the upper end of the central pipe is in screwed connection with the upper connector, and the lower end of the central pipe is in screwed connection with the anchoring claw. The anchor is installed on the outer side face of the center pipe and connected with an upper connector through a left-handed square buckle, the anchoring claw is installed on the anchor, an unblocking spin lock pin is embedded in the outer side face of the lower end of the center pipe, the outer side face of the center pipe is sleeved with an unblocking spiral sleeve, and the left-handed square buckle is connected with the left-handed square buckle. The deblocking spiral sleeve is connected with the full-angle slip bowl through a left-handed square buckle, and the deblocking spin lock pin is located in an inner diameter axial groove of the deblocking spiral sleeve and can freely slide. The full-angle slip packer with multiple deblocking modes can meet the working requirements of high-pressure, high-temperature and deep well packers, and meanwhile, the deblocking modes of the packers are increased, so that the well repair cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of oil extraction equipment technology, specifically to a full-angle slip packer with multiple unsealing methods. Background Technology

[0002] Currently, packers used in oil and gas wells are generally anchored with four slips at a 90° angle and six slips at a 60° angle. The inner wall area of ​​the casing anchored by the slips is relatively small, while the pressure on the inner wall of the anchored casing is relatively large. Therefore, the slips cause varying degrees of damage to the inner wall of the casing, making it difficult to withstand high-pressure sealing. For high-pressure and deep wells, it is difficult to meet the high-pressure sealing effect. Moreover, conventional packers only have one way to release the seal. If the release fails, a minor workover operation is required to turn into a major workover operation to retrieve the packer. The workover drilling rig mainly uses strong retrieval measures such as milling, grinding, and shock to retrieve the packer, which directly increases the retrieval cost of the packer. At the same time, the workover time is long, which affects the work efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a full-angle slip packer with multiple unsealing methods, which can meet the working requirements of packers in high pressure, high temperature and deep wells, while increasing the packer unsealing methods and reducing well workover costs, thus effectively solving the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a full-angle slip packer with multiple unsealing methods, comprising a central tube, a full-angle slip seat, anchoring claws, an anchor, and an upper connector. The full-angle slip seat is disposed on the outer side of the central tube. The upper end of the central tube is threadedly connected to the upper connector. The anchor is installed on the outer side of the central tube and connected to the upper connector via a left-hand square buckle. The anchoring claw is installed on the anchor. An unsealing locking pin is embedded in the outer side of the lower end of the central tube. An unsealing spiral sleeve is sleeved on the outer side of the central tube. The unsealing spiral sleeve is connected to the full-angle slip seat via a left-hand square buckle. The unsealing locking pin is located in the axial groove of the inner diameter of the unsealing spiral sleeve and can slide freely. A sealing guide tube is provided on the outer side of the central tube. The full-angle slip seat is located on the outer side of the sealing guide tube. One end of the full-angle slip seat is connected to the full-angle slip tooth through a tenon and mortise structure. The other end of the full-angle slip seat is connected to the full-angle sealing wedge. One end of the full-angle sealing wedge is connected to the suspension rubber sleeve seat through a thread. An integral sealing seat is provided on the outer side of the sealing conduit. A first rubber sleeve, a spacer ring, and a second rubber sleeve are sequentially installed on the outer side of the integral sealing seat. One end of the integral sealing seat is connected to the suspension rubber sleeve seat, and the other end is located in the sealing liquid cylinder. The sealing liquid cylinder is connected to the anchor through a sealing ring.

[0005] As a preferred embodiment of the present invention, a trapezoidal fixing tile is embedded in the full-angle locking seat, and the trapezoidal fixing tile cooperates with the seat sealing guide to achieve limiting.

[0006] As a preferred embodiment of the present invention, the central tube and the seated conduit are fixedly connected by unsealing shear pins.

[0007] As a preferred technical solution of the present invention, the tenon and mortise structure of the full-angle bracket is a 360° seamless assembly.

[0008] As a preferred embodiment of the present invention, the full-angle retaining seat is hung on the full-angle retaining wedge via a dovetail groove.

[0009] As a preferred embodiment of the present invention, the suspension rubber sleeve seat is hung on the integral sealing seat by a segmented slip, and the segmented slip slides freely in the inner cavity of the full-angle seat sealing wedge and the suspension rubber sleeve seat.

[0010] As a preferred embodiment of the present invention, a seating slip is installed inside the integral sealing seat, and the locking teeth of the seating slip are locked onto the seating guide tube.

[0011] As a preferred embodiment of the present invention, a pressure boosting piston ring and a force boosting piston are also sequentially installed inside the seated liquid cylinder.

[0012] As a preferred embodiment of the present invention, the anchoring claw is fixed to the anchor by a pressure bar and a fixing bolt.

[0013] Compared with the prior art, the beneficial effects of this invention are: the full-angle slip packer with multiple unsealing methods is reasonably designed and ingeniously conceived, improves the conventional packer design structure, meets the working needs of packers in high pressure, high temperature, and deep wells, increases the packer unsealing methods, and can immediately use a second unsealing method to unseal and retrieve the packer when one unsealing method fails, avoiding the need for minor repairs to major repairs, effectively reducing oilfield well repair costs, shortening the well repair cycle, and improving operational efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the structure after the packer is lowered into the wellbore. Figure 4 A schematic diagram showing the state of the packer during the unsealing process when the packer is being lifted and lowered; Figure 5 This diagram illustrates another unsealing state under the condition of unsealing failure during the lifting and lowering of the tubing string. Figure 6 This is a schematic diagram of the unsealing state after the tubing has been unsealed during lifting and lowering.

[0015] In the diagram: 1. Central tube, 2. Unsealing pivot pin, 3. Unsealing spiral sleeve, 4. Full-angle slip seat, 5. Trapezoidal fixing tile, 6. Unsealing shear pin, 7. Sealing guide tube, 8. Full-angle slip tooth, 9. Full-angle sealing wedge, 10. Suspension rubber sleeve seat, 11. Split slip, 12. First rubber sleeve, 13. Spacer ring, 14. Second rubber sleeve, 15. Sealing slip, 16. Sealing liquid cylinder, 17. Integral sealing seat, 18. Pressure boosting piston ring, 19. Force boosting piston, 20. Anchoring claw, 21. Anchor, 22. Pressure strip, 23. Fixing bolt, 24. Upper connector. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figure 1-2 The present invention provides a technical solution: a full-angle slip packer with multiple unsealing methods, including a central tube 1, an unsealing rotary locking pin 2 embedded on the lower outer side of the central tube 1, the unsealing rotary locking pin 2 sliding freely in the axial groove of the inner diameter of the unsealing spiral sleeve 3, the unsealing spiral sleeve 3 being sleeved on the central tube 1 and connected to the full-angle slip seat 4 with a left-hand square buckle, the left-hand square buckle on the unsealing spiral sleeve 3 driving the full-angle slip seat 4 to move downward; The trapezoidal fixing tile 5 is embedded in the full-angle locking tile seat 4 and the sealing guide tube 7 to limit the position. The sealing guide tube 7 is located outside the central tube 1. The unsealing shearing nail 6 fixes the central tube 1 and the sealing guide tube 7 together to prevent the central tube 1 and the sealing guide tube 7 from moving relative to each other. The full-angle slip seat 4 is located on the outer side of the sealing conduit 7. The full-angle slip tooth 8 is fixed to the full-angle slip seat 4 through a tenon and mortise structure. The tenon and mortise structure of the full-angle slip seat 4 is a 360° seamless assembly, which effectively reduces the anchoring pressure of the full-angle slip tooth 8 on the inner wall of the casing, thereby reducing the damage to the casing caused by the full-angle slip tooth 8. Furthermore, the full-angle slip tooth 8 is hung on the full-angle sealing wedge 9 through a dovetail groove. The full-angle sealing wedge 9 is threadedly connected to the suspension rubber sleeve seat 10. The suspension rubber sleeve seat 10 is hung on the integral sealing seat 17 through the split slip 11. The integral sealing seat 17 is located on the outside of the sealing conduit 7. The split slip 11 slides freely in the inner cavity of the full-angle sealing wedge 9 and the suspension rubber sleeve seat 10. The first rubber sleeve 12, the spacer ring 13, and the second rubber sleeve 14 are fitted on the integral sealing seat 17 and fixed by the suspension rubber sleeve seat 10 and the split slip 11. The sealing slip 15 is installed inside the integral sealing seat 17. The locking teeth of the sealing slip 15 are locked on the sealing conduit 7, which plays the role of preventing the first rubber sleeve 12 and the second rubber sleeve 14 from stretching and retreating after the integral sealing seat 17 compresses the rubber sleeve for sealing. The integral sealing seat 17, the pressure boosting piston ring 18, and the force boosting piston are sequentially installed inside the sealing liquid cylinder 16. The sealing liquid cylinder 16 is connected to the anchor 21 via a sealing ring. The anchoring claw 20 is fixed to the anchor 21 via a pressure strip 22 and a fixing bolt 23. The anchor 21 is connected to the upper connector 24 via a left-hand square buckle. The central tube 1 is threadedly connected to the upper connector 24, thereby releasing the locking pin 2, the unlocking spiral sleeve 3, and the full-angle slip seat 4. 5. Trapezoidal fixing tile, 6. Unsealing shear nail, 7. Sealing conduit, 8. Full-angle locking tooth, 9. Full-angle sealing wedge, 10. Suspension rubber sleeve seat, 11. Split locking tile, 12. First rubber sleeve, 13. Spacer ring, 14. Second rubber sleeve, 15. Sealing locking tile, 16. Sealing liquid cylinder, 17. Integral sealing seat, 18. Pressure boosting piston ring, 19. Pressure increasing piston, 21. Anchor 21 are all fitted onto the central tube 1. When the upper connector 24 rotates, the central tube 1 moves upward to unseal.

[0018] like Figure 3 When the packer is lowered to the designated position in the wellbore, it adheres to the pressure. Figure 3 The liquid shown enters the sealing cylinder 16 under pressure. The integral sealing seat 17 and the booster piston 19 move downward under pressure, pushing the full-angle sealing wedge 9, the suspension rubber sleeve seat 10, the split slip 11, the first rubber sleeve 12, the spacer ring 13, and the second rubber sleeve 14 downward. Since the full-angle slip seat 4 is fixed to the sealing guide tube 7 by the trapezoidal fixing tile 5, the full-angle sealing wedge 9 moves downward, pushing the full-angle slip teeth 8 to open and anchor on the inner wall of the sleeve. At this time, the integral sealing seat 17 and the booster piston 19 move downward under pressure, pushing the full-angle sealing wedge 9, the suspension rubber sleeve seat 10, the split slip 11, the first rubber sleeve 12, the spacer ring 13, and the second rubber sleeve 14 to continue moving downward under pressure, compressing the rubber sleeves to expand on the inner wall of the sleeve to achieve a sealing effect.

[0019] like Figure 4 When the packer needs to be unsealed, the tubing string is lifted. At this time, the upper connector 24 drives the central tube 1, anchor 21, anchor claws 20, 22 pressure strips, and 23 fixing bolts to move upward simultaneously. The unsealing shear 6 cuts as the central tube 1 moves upward. The central tube 1 moves upward, and the trapezoidal fixing tile 5 falls below the step of the central tube 1. The full-angle slip seat 4 loses the limiting and fixing function of the trapezoidal fixing tile 5, which drives the full-angle slip tooth 8, the full-angle seat wedge 9, and the suspension rubber sleeve seat 10 to move. The full-angle slip tooth 8, the first rubber sleeve 12, the spacer ring 13, and the second rubber sleeve 14 retract simultaneously. At the same time, the seat sealing cylinder 16 and the anchor 21 separate and depressurize. The anchor claw 20 retracts under the action of the spring, and the entire packer is unsealed and retrieved from the wellbore.

[0020] like Figure 5 When the packer lifting and lowering column fails to unseal, the ground rotates the column, and at the same time, the upper connector 24 drives the central tube 1 to rotate. As the upper connector 24 rotates, the left-hand square buckle of the anchor 21 begins to unfasten. The central tube 1 drives the unsealing locking pin 2 to rotate, and the unsealing locking pin 2 drives the unsealing spiral sleeve 3 to rotate. The unsealing spiral sleeve 3, through the left-hand square buckle, causes the trapezoidal fixing tile 5 installed inside the full-angle clamp seat 4 to play a limiting role. Under the action of the unsealing locking pin 2, it moves upward, and the unsealing shear pin 6 cuts at the same time. The central tube 1 moves upward, and the trapezoidal fixing tile 5 detaches from the central tube 1 and slides down the step. The full-angle clamp seat 4 loses the limiting and fixing role of the trapezoidal fixing tile 5. The full-angle clamp seat 4, full-angle clamp tooth 8, full-angle seat sealing wedge 9, suspension rubber sleeve seat 10, first rubber sleeve 12, spacer ring 13, and second rubber sleeve 14 fall down, and the rubber sleeve is retracted and unsealed.

[0021] like Figure 6 As shown, compared with conventional packers, the main difference of this invention lies in the fact that the lower end of the central tube 1 is inlaid with an unsealing locking pin 2, which slides freely in the keyway of the unsealing spiral sleeve 3, allowing the central tube 1 and the unsealing spiral sleeve 3 to rotate synchronously. The unsealing spiral sleeve 3 is connected to the full-angle slip seat 4 with a left-hand square buckle. The central tube 1 rotates right to unseale the spiral sleeve 3 and the full-angle slip seat 4, causing the full-angle slip seat 4 to drive the full-angle slip teeth 8 to move downwards. The full-angle slip teeth 8 retract to unseal, thus achieving the purpose of adding a rotational unsealing method on the basis of lifting and lowering the tube column for unsealing.

[0022] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-angle slip packer with multiple unsealing methods, comprising a central tube (1), a full-angle slip seat (4), an anchoring claw (20), an anchor (21), and an upper connector (24), wherein the full-angle slip seat (4) is disposed on the outer side of the central tube (1), the upper end of the central tube (1) is threadedly connected to the upper connector (24), the anchor (21) is installed on the outer side of the central tube (1) and connected to the upper connector (24) by a left-hand square buckle, and the anchoring claw (20) is installed on the anchor (21), characterized in that: The lower outer side of the central tube (1) is inlaid with a sealing screw pin (2), and the outer side of the central tube (1) is fitted with a sealing screw sleeve (3). The sealing screw sleeve (3) is connected to the full-angle clamp seat (4) by a left-hand square buckle. The sealing screw pin (2) is located in the axial groove of the inner diameter of the sealing screw sleeve (3) and can slide freely. The outer side of the central tube (1) is provided with a sealing guide tube (7), the full-angle slip seat (4) is located on the outer side of the sealing guide tube (7), one end of the full-angle slip seat (4) is connected to the full-angle slip tooth (8) through a tenon and mortise structure, the other end of the full-angle slip seat (4) is connected to the full-angle sealing wedge (9), and the outer side of one end of the full-angle sealing wedge (9) is connected to the suspension rubber sleeve seat (10) through a thread. The outer side of the seated conduit (7) is provided with an integral sealing seat (17). The outer side of the integral sealing seat (17) is sequentially equipped with a first rubber sleeve (12), a spacer ring (13), and a second rubber sleeve (14). One end of the integral sealing seat (17) is connected to the suspended rubber sleeve seat (10), and the other end is located inside the seated liquid cylinder (16). The seated liquid cylinder (14) is connected to the anchor (21) through a sealing ring.

2. The full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The full-angle locking seat (4) is inlaid with a trapezoidal fixing tile (5), which cooperates with the seat sealing guide tube (7) to achieve positioning.

3. The full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The central tube (1) and the seated conduit (7) are fixedly connected by unsealing screws (6).

4. The full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The tenon and mortise structure of the full-angle bracket (4) is a 360° seamless assembly.

5. A full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The full-angle retaining plate (4) is hung on the full-angle retaining plate oblique iron (9) through the dovetail groove.

6. The full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The suspension rubber sleeve seat (10) is hung on the integral sealing seat (17) by the segmented slip (11), and the segmented slip (11) slides freely in the inner cavity of the full-angle seat sealing wedge (9) and the suspension rubber sleeve seat (10).

7. A full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The integral sealing seat (17) is equipped with a seat seal slip (15), and the locking teeth of the seat seal slip (15) are locked onto the seat seal guide tube (7).

8. A full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The seated liquid cylinder (16) is also equipped with a pressure boosting piston ring (18) and a force boosting piston (19) in sequence.

9. A full-angle slip packer with multiple unsealing methods according to claim 1, characterized in that: The anchoring claw (20) is fixed to the anchor (21) by a pressure strip (22) and a fixing bolt (23).

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