Anti-clamping thermal recovery packer

Abstract

The invention discloses an anti-clamping thermal recovery packer which comprises a heat insulation coupling, and a heat insulation short section, an anti-clamping coupling, a sealing short section, a seat seal propeller, a seat seal cylinder cover, a cylinder body and a transition short section which are connected in sequence, the two ends of the outer side face of the heat insulation short section are in screwed connection with the inner side face of the heat insulation coupling and the inner side face of the anti-clamping coupling respectively, one end of the sealing short section is in screwed connection with the inner side face of the anti-clamping coupling, and the other end of the sealing short section is located in the setting propeller. An unlocking central pipe is arranged in the heat insulation short section and the sealing short section, one end of the unlocking central pipe is in threaded connection with a hanging sealing sleeve, the hanging sealing sleeve is hung at one end of the heat insulation short section, and the other end of the unlocking central pipe is in threaded connection with a heat insulation sealing sleeve. According to the anti-clamping thermal recovery packer, the situation that the rubber barrel is clamped in the unsealing process can be prevented, meanwhile, the loss of steam injection thermal efficiency is reduced, and the plugging effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy oil exploitation, and specifically relates to an anti-sticking thermal recovery packer. Background Art

[0002] Thermal recovery packers are common and key downhole tools in heavy oil exploitation, and are used for steam injection well plugging, stratified steam injection, etc.

[0003] Existing thermal recovery packers use hydraulic setting and lifting to release the seal. When the high-temperature sealing rubber barrel is released, the rubber barrel is prone to jamming and cannot be released smoothly. At the same time, existing thermal recovery packers have a large heat loss during the plugging of injection wells, which affects the plugging effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects, and provide an anti-sticking thermal recovery packer, which can prevent the rubber barrel from jamming during the release process, and at the same time reduce the loss of steam injection thermal efficiency and improve the plugging effect, and can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: an anti-sticking thermal recovery packer, including a heat insulation coupling and a heat insulation short section, an anti-sticking coupling, a sealing short section, a setting pusher, a setting cylinder head, a cylinder body and a transition short section connected in sequence;

[0006] Both ends of the outer side of the heat insulation short section are threadedly connected to the inner sides of the heat insulation coupling and the anti-sticking coupling respectively. One end of the sealing short section is threadedly connected to the inner side of the anti-sticking coupling, and the other end is located inside the setting pusher;

[0007] An unlocking central tube is arranged in the heat insulation short section and the sealing short section. One end of the unlocking central tube is threadedly connected to a hanging sealing sleeve. The hanging sealing sleeve is hung at one end of the heat insulation short section. The other end of the unlocking central tube is threadedly connected to a heat insulation sealing sleeve. The heat insulation sealing sleeve is arranged in the sealing short section. A high-temperature sealing rubber barrel is sleeved on the outer side of the sealing short section. The inside of the heat insulation sealing sleeve is threadedly connected to one end of a pressure transmission pipe. The other end of the pressure transmission pipe is connected to a piston joint. Pressure transmission holes are arranged on the pressure transmission pipe. The piston joint is arranged in the cylinder body. One end of the cylinder body is connected to the setting pusher through the setting cylinder head. The other end of the piston joint is connected to the transition short section.

[0008] As a preferred technical solution of the present invention, an annular vacuum heat insulation space is formed between the hanging sealing sleeve, the heat insulation short section, the unlocking central tube and the anti-sticking coupling.

[0009] As a preferred technical solution of the present invention, one end of the sealing nipple is connected to the fixed seat. An unlocking ring is arranged on the outer side surface of the pressure transmission pipe. The unlocking ring is tightly pressed against one side of the fixed seat. Bearing balls are installed in the limiting holes of the fixed seat. A locking ring is pressed against one side of the bearing balls. A thrust ring is arranged on one side of the locking ring. The thrust ring is arranged in the setting packer

[0010] As a preferred technical solution of the present invention, a limiting shear pin is arranged between the sealing nipple and the heat insulation sealing sleeve.

[0011] As a preferred technical solution of the present invention, a releasing shear pin is arranged between the pressure transmission pipe and the fixed seat.

[0012] As a preferred technical solution of the present invention, a setting shear pin is arranged between the cylinder block and the piston joint.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The anti-sticking thermal recovery packer of the present invention meets the reliability of the thermal recovery packer during fishing and releasing by arranging an unlocking central pipe. The high-temperature sealing rubber barrel can be easily released by arranging an anti-sticking coupling. The unlocking ring is used to control the bearing balls to release the thrust ring and the locking ring, so that they retreat from the compression of the high-temperature sealing rubber barrel, promoting the smooth contraction and release of the high-temperature sealing rubber barrel; (2) The annular vacuum heat insulation space formed between the hanging sealing sleeve, the heat insulation nipple, the unlocking central pipe and the anti-sticking coupling can effectively reduce the loss of steam injection heat efficiency. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic structural diagram when the high-temperature sealing rubber barrel is compressed and set;

[0016] Figure 3 is a schematic structural diagram after the high-temperature sealing rubber barrel is released.

[0017] In the figure: 1 heat insulation coupling, 2 hanging sealing sleeve, 3 high-temperature sealing ring I, 4 high-temperature sealing ring II, 5 heat insulation nipple, 6 unlocking central pipe, 7 anti-sticking coupling, 8 high-temperature sealing ring III, 9 sealing nipple, 10 high-temperature sealing rubber barrel, 11 heat insulation sealing sleeve, 12 high-temperature sealing ring IV, 13 high-temperature sealing ring V, 14 limiting shear pin, 15 pressure transmission pipe, 16 thrust ring, 17 locking ring, 18 fixed seat, 19 releasing shear pin, 20 bearing ball, 21 unlocking ring, 22 setting packer, 23 setting cylinder head, 24 high-temperature sealing ring VI, 25 cylinder block, 26 high-temperature sealing ring VII, 27 piston joint, 28 setting shear pin, 29 transition nipple. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-3 , the present invention provides a technical solution: an anti-sticking thermal recovery packer, which includes a heat insulation coupling 1. The inner side surface of the heat insulation coupling 1 is threadedly connected with a heat insulation short section 5. One end of the heat insulation short section 5 is suspended with a suspension seal sleeve 2. The other end of the heat insulation short section 5 is threadedly connected to the inner side surface of an anti-sticking coupling 7. The other end of the inner side surface of the anti-sticking coupling 7 is threadedly connected with a seal short section 9. The other end of the seal short section 9 is located inside a setting actuator 22. A heat insulation seal sleeve 11 is arranged inside the seal short section 9. An unlocking central tube 6 is arranged inside the heat insulation short section 5 and the seal short section 9. One end of the unlocking central tube 6 is threadedly connected with the suspension seal sleeve 2, and the other end of the unlocking central tube 6 is threadedly connected with the heat insulation seal sleeve 11. An annular vacuum heat insulation space is formed between the suspension seal sleeve 2, the heat insulation short section 5, the unlocking central tube 6 and the anti-sticking coupling 7 to reduce the loss of steam injection heat efficiency;

[0020] A high-temperature seal rubber cylinder 10 is sleeved on the outer side surface of the seal short section 9. One end of a pressure transmission pipe 15 is threadedly connected inside the heat insulation seal sleeve 11. The other end of the pressure transmission pipe 15 is connected with a piston joint 27. Pressure transmission holes are arranged on the pressure transmission pipe 15. The piston joint 27 is arranged inside a cylinder block 25. One end of the cylinder block 25 is connected with the setting actuator 22 through a setting cylinder head 23. The other end of the piston joint 27 is connected with a transition short section 29. When pressure enters the working cavities of the cylinder block 25 and the piston joint 27 through the pressure transmission holes of the pressure transmission pipe 15, the setting actuator 22 and the setting cylinder head 23 compress the high-temperature seal rubber cylinder 10 under the action of the pressure and expand to seal on the oil well casing to play a sealing role;

[0021] A limit shear pin 14 is arranged between the seal short section 9 and the heat insulation seal sleeve 11. A releasing shear pin 19 is arranged between the pressure transmission pipe 15 and a fixed seat 18. A setting shear pin 28 is arranged between the cylinder block 25 and the piston joint 27. The limit shear pin 14, the releasing shear pin 19 and the setting shear pin 28 play a temporary limiting role. When the workpiece needs to move under the action of pressure and tensile force, they start to shear within the limit tensile value and lose the limiting effect.

[0022] In order to enable this thermal recovery packer to achieve high-temperature sealing, a high-temperature sealing ring I3 and a high-temperature sealing ring II4 are respectively arranged between the hanging sealing sleeve 2 and the heat insulation short joint 5, a high-temperature sealing ring III8 is arranged between the anti-sticking clamp 7 and the unlocking central tube 6, a high-temperature sealing ring IV12 and a high-temperature sealing ring V13 are arranged between the sealing short joint 9 and the heat insulation sealing sleeve 11, and a high-temperature sealing ring VI24 is arranged between the setting packer cylinder head 23 and the pressure transmission pipe 15.

[0023] To facilitate the shrinkage and release of the high-temperature sealing rubber cylinder 10, one end of the sealing short joint 9 is connected to the fixed seat 18. An unlocking ring 21 is arranged on the outer side surface of the pressure transmission pipe 15. The unlocking ring 21 tightly presses against one side of the fixed seat 18. Bearing balls 20 are installed in the limiting holes of the fixed seat 18. One side of the bearing balls 20 presses against a locking ring 17. A thrust ring 16 is arranged on one side of the locking ring 17. The thrust ring 16 is arranged in the setting packer actuator 22.

[0024] When the high-temperature sealing rubber cylinder 10 needs to shrink, rotate the connection positions of the heat insulation coupling 1, the heat insulation short joint 5 and the anti-sticking clamp 7 to make them disconnected. At the same time, lift the pipe string. The hanging sealing sleeve 2, the heat insulation short joint 5 and the unlocking central tube 6 drive the heat insulation sealing sleeve 11 to move. The heat insulation sealing sleeve 11 drives the pressure transmission pipe 15 to move. The pressure transmission pipe 15 drives the unlocking ring 21 to move. The unlocking ring 21 releases the bearing balls 20 on the fixed seat 18. The bearing balls 20 leave the fixed groove of the locking ring 17. Therefore, the thrust ring 16 and the locking ring 17 lose the fixing effect of the bearing balls 20 and release the compression on the high-temperature sealing rubber cylinder 10 together with the setting packer actuator 22. At the same time, the setting packer cylinder head 23 and the cylinder block 25 also retract synchronously, achieving the purpose of the smooth shrinkage of the high-temperature sealing rubber cylinder 10.

[0025] The present invention can enable the high-temperature sealing rubber cylinder 10 to shrink smoothly when it shrinks and unlocks, avoiding jamming, and greatly improving the convenience of use.

[0026] The parts not detailed in the invention are the prior art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-sticking thermal recovery packer, characterized by: It comprises a heat-insulating coupling (1) and a heat-insulating short section (5), an anti-stuck coupling (7), a sealing short section (9), a sealing thruster (22), a sealing cylinder cover (23), a cylinder body (25) and a transition short section (29) which are connected in sequence; The two ends of the outer side surface of the heat-insulating short section (5) are respectively connected to the inner side surfaces of the heat-insulating coupling (1) and the anti-stuck coupling (7) by threading; one end of the sealing short section (9) is connected to the inner side surface of the anti-stuck coupling (7) by threading, and the other end is located inside the sealing thruster (22); An unlocking center tube (6) is arranged inside the thermal insulation pup joint (5) and the sealing pup joint (9), one end of the unlocking center tube (6) is threadedly connected to a hanging sealing sleeve (2), the hanging sealing sleeve (2) is hung on one end of the thermal insulation pup joint (5), the other end of the unlocking center tube (6) is threadedly connected to a thermal insulation sealing sleeve (11), the thermal insulation sealing sleeve (11) is arranged inside the sealing pup joint (9), and the outer side surface of the sealing pup joint (9) is sleeved with a high-temperature sealant. The cylinder (10) is provided with a heat-insulating sealing sleeve (11) and is threadedly connected to one end of a pressure-transmitting tube (15). The other end of the pressure-transmitting tube (15) is connected to a piston joint (27). A pressure-transmitting hole is provided on the pressure-transmitting tube (15). The piston joint (27) is arranged in the cylinder body (25). One end of the cylinder body (25) is connected to a sealing thruster (22) through a sealing cylinder cover (23). The other end of the piston joint (27) is connected to a transition short section (29).

2. The anti-sticking thermal recovery packer according to claim 1, characterized in that: An annular vacuum heat-insulating space is formed between the hanging sealing sleeve (2), the heat-insulating short joint (5), the unlocking central tube (6) and the anti-stuck coupling (7).

3. The anti-sticking thermal recovery packer according to claim 1, characterized in that: One end of the sealing nipple (9) is connected to a fixed seat (18); an unlocking ring (21) is provided on the outer side surface of the pressure transmission tube (15); the unlocking ring (21) is pressed tightly against one side of the fixed seat (18); a bearing ball (20) is installed in a limiting hole of the fixed seat (18); a locking ring (17) is pressed against one side of the bearing ball (20); a thrust ring (16) is provided on one side of the locking ring (17); and the thrust ring (16) is arranged in the seat seal thruster (22).

4. The anti-sticking thermal recovery packer according to claim 1, characterized in that: A limited shear pin (14) is provided between the sealing nipple (9) and the heat-insulating sealing sleeve (11).

5. The anti-sticking thermal recovery packer according to claim 1, characterized in that: An unsealing shear pin (19) is provided between the pressure transmission pipe (15) and the fixing seat (18).

6. The anti-sticking thermal recovery packer according to claim 1, characterized in that: Seat seal shear pins (28) are provided between the cylinder body (25) and the piston joint (27).

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