Throwing and fishing booster for blanking plug of polymer flooding injection well

Abstract

The invention relates to the field of oil field oil extraction, in particular to a polymer flooding injection well blanking plug throwing and fishing booster which comprises a body (2), the lower end of the body (2) is connected with a lower connector (15) through a coupling (6), a short piston (3) is arranged in the body (2), the lower end of the short piston (3) is connected with a connecting rod (5), and the outer portion of the lower end of the connecting rod (5) is connected with a quick coupler (11). The lower end of the quick coupler (11) is provided with a protruding deflector rod (17), the interior of the lower coupler (15) is connected with a roller (12) through a horizontal rotating shaft, the roller (12) is connected with a rotatable upper release claw (13) and a rotatable lower release claw (14), the outer surface of the roller (12) is provided with a groove, and the deflector rod (17) is located in the groove. The polymer flooding injection well blanking plug throwing and fishing booster can help the blanking plug to move downwards in an accelerated mode when passing through a working barrel of a water distributor, a weighting rod is omitted, the operation difficulty is reduced, and the test success rate and the test efficiency are improved.

Description

Technical Field

[0001] The invention relates to the field of oil production, in particular to a polymer drive injection well plugger casting and fishing booster. Background Art

[0002] During the process of launching and fishing the plug in polymer-driven eccentric injection wells, in order to overcome the downward resistance and ensure the successful launch of the plug in one go, it is often necessary to install weighted rods of different specifications (300mm, 600mm) on the fishing device. The fishing distance is used to help the fishing device descend, which increases the difficulty of operation and safety hazards. Summary of the Invention

[0003] In order to overcome the disadvantage that a weighted rod needs to be installed during the existing plug casting and retrieval process, which increases the difficulty of operation, the present invention provides a polymer-driven injection well plug casting and retrieval booster. The polymer-driven injection well plug casting and retrieval booster can help the plug accelerate downward when passing through the water distributor working cylinder, eliminating the weighted rod, reducing the difficulty of operation, and improving the test success rate and test efficiency.

[0004] The technical solution of the present invention is: a polymer-driven injection well plugger fishing booster, including a main body, the lower end of the main body is connected to the lower joint through a coupling, a short piston is provided inside the main body, the lower end of the short piston is connected to a connecting rod, and the lower end of the connecting rod is externally connected to a quick-release joint; a protruding lever is provided at the lower end of the quick-release joint, the lower joint is connected to a roller through a horizontal rotating shaft, the roller is connected to a rotatable upper release claw and a lower release claw, and a groove is provided on the outer surface of the roller, and the lever is located in the groove.

[0005] The groove on the roller is along the circumferential direction of the roller, and a deep pit is provided at one end of the groove, and the radial depth of the deep pit is greater than the depth of the other end of the groove.

[0006] When the shift lever is located in the deep pit of the roller groove, the quick-release joint is separated from the connecting rod; when the shift lever is located outside the deep pit of the roller groove, the quick-release joint is connected to the connecting rod.

[0007] The upper release claw and the lower release claw are connected to the roller through a rotating shaft respectively, and a torsion spring is provided on the rotating shaft. Under the action of the torsion spring, the upper release claw and the lower release claw are opened outward.

[0008] The side wall of the lower joint is opened relative to the roller. When the upper release claw and the lower release claw are opened, the ends thereof extend out of the outer wall of the lower joint from the opening.

[0009] The relative positions of the upper release claw and the lower release claw are as follows: when the lever on the quick connector is located at the end of the roller groove away from the deep pit, the upper release claw is in a position horizontal to the roller shaft, at which time the upper release claw is open and the lower release claw is retracted; when the lever is in the deep pit of the roller groove, the lower release claw is in a position horizontal to the roller shaft, at which time the lower release claw is open and the upper release claw is retracted.

[0010] The outer surface of the lower end of the connecting rod is provided with several axial grooves, a locking sleeve is provided inside the quick-release joint, and a plurality of spherical grooves corresponding to the axial grooves of the connecting rod are opened on the side wall of the locking sleeve, and steel balls are provided in the spherical grooves. A spring is provided between the bottom surface of the locking sleeve and the quick-release joint.

[0011] A compression spring is provided between the upper end surface of the quick connector and the lower end surface of the coupling.

[0012] A release spring is provided between the short piston and the upper end surface of the coupling.

[0013] When the quick-release connector enters the deep pit of the groove, the connecting rod separates from the quick-release connector. The connecting rod and the short piston move upward under the action of the release spring, accelerating the discharge of the liquid in the main body upward through the drainage hole on the side wall. The well fluid generates an equal downward thrust on the instrument, thereby helping the instrument to descend.

[0014] The present invention has the following beneficial effects: due to the adoption of the above-mentioned scheme, the lower end of the connecting rod is connected to the quick-release joint, and the connection and separation of the connecting rod and the quick-release joint are achieved by the different positions of the lever at the lower end of the quick-release joint in the roller, thereby helping the instrument to accelerate downward when passing through the water distributor working cylinder during the process of casting and fishing out the plug in the polymer drive eccentric injection well, reducing the operating intensity, improving safety, and improving the test success rate and test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 A partial enlarged view of .

[0016] In the figure, 1-upper joint, 2-main body, 3-short piston, 4-release spring, 5-connecting rod, 6-coupling, 7-locking sleeve, 8-steel ball, 9-spring, 10-compression spring, 11-quick release joint, 12-roller, 13-upper release claw, 14-lower release claw, 15-lower joint, 16-guide head, 17-shift lever. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 、 Figure 2As shown, a polymer flooding injection well plugging and fishing booster comprises a main body 2, the upper end of which is connected to an upper joint 1, and the lower end is connected to a lower joint 15 via a coupling 6. The interior of the coupling 6 is solid, sealing the lower end of the main body 2. The bottom of the lower joint 15 is connected to a guide head 16. A short piston 3 is installed within the main body 2, with a sealing ring installed between the outer wall of the short piston 3 and the inner wall of the main body 2. The lower end of the short piston 3 is connected to a connecting rod 5. The lower end of the connecting rod 4 passes through the coupling 6 and is connected to a quick-release connector 11. A release spring 4 is installed between the short piston 3 and the upper end surface of the coupling 6, and the release spring 4 is located outside the connecting rod 5.

[0018] The connecting rod 4 is connected to the quick-release connector 11 in the following manner: the outer surface of the lower end of the connecting rod 5 is provided with several axial grooves. The quick-release connector 11 is internally provided with a locking sleeve 7. The sidewall of the locking sleeve 7 is provided with several spherical grooves corresponding to the axial grooves. A steel ball 8 is positioned within the spherical grooves. A boss is provided on the inner wall of the quick-release connector 11 at the location corresponding to the steel ball 8. When the steel ball 8 is located on the boss, the boss pushes the steel ball 8 toward the bottom of the spherical groove. The steel ball 8 protrudes from the inner wall of the locking sleeve 7 and rests within the axial groove of the connecting rod 5. When the steel ball 8 disengages the boss on the inner wall of the quick-release connector 11, it can slide outward, i.e., fall out of the axial groove of the connecting rod 5. A spring 9 is provided between the bottom surface of the locking sleeve 7 and the quick-release connector 15. When not subject to external force, the spring 9 pushes the locking sleeve 7 upward. At this time, the steel ball 8 is compressed by the boss on the inner wall of the quick-release connector 11 and rests at the bottom of the spherical groove. When the connecting rod 5 needs to be connected to the quick connector 11, the connecting rod 5 is subjected to an external force downward, pushing the locking sleeve 7 downward to compress the spring 9, and the steel ball 8 moves downward therewith, so that the steel ball 8 is released from the compression of the inner wall boss of the quick connector 11 and moves outward, causing the connecting rod 5 to move downward relative to the locking sleeve 7 and enter the locking sleeve 7. When the external force on the connecting rod 5 is removed, the spring 9 pushes the locking sleeve 7 upward, driving the steel ball 8 upward. The steel ball 8 is locked in the axial groove of the connecting rod 5 under the pressure of the inner wall boss of the quick connector 11, thereby connecting the quick connector 15 to the connecting rod 5. The quick connector 15 is provided with a step on the outside, and a compression spring 10 is provided between the upper surface of the step and the lower end surface of the coupling 6. The elastic force of the compression spring 10 is greater than the elastic force of the spring 9. When no external force is applied, the compression spring 10 pushes the quick connector 11 downward.

[0019] The quick connector 11 is provided with a protruding lever at its lower end. The lower connector 15 is internally connected to the roller 12 via a horizontal rotating shaft. The outer surface of the roller 12 is provided with an arc-shaped groove along its circumference, with a deep pit at one end. The lever at the lower end of the quick connector 11 is located within the groove. As the roller 12 rotates, the lever is positioned at different positions within the groove. When the lever is located within the groove, other than the deep pit, the roller 12 pushes the quick connector 11 upward, compressing the steel ball 8 against the inner wall boss of the quick connector 11, connecting the connecting rod 5 to the quick connector 11. When the lever is located within the deep pit, the quick connector 11 moves downward, disengaging the steel ball 8 from the inner wall boss of the quick connector 11 and sliding out of the axial groove of the connecting rod 5, separating the connecting rod 5 from the quick connector 11.

[0020] The roller 12 is connected to an upper release claw 13 and a lower release claw 14. The upper release claw 13 and the lower release claw 14 are each connected to the roller 12 via a rotating shaft, allowing the two release claws to rotate around their respective rotations. A torsion spring is provided on the rotating shaft. Under the action of the torsion spring, the upper release claw 13 and the lower release claw 14 both open outward when not subjected to external force. A limiter is provided on the roller 12 to maintain the release claws in the open position. The release claws can be retracted inward when subjected to a reverse external force. The side wall of the lower joint 15 is opened relative to the roller 12. When the upper release claw 13 and the lower release claw 14 open outward, their ends extend from the opening to the outer wall of the lower joint 15. When the release claws retract, they retract into the interior of the lower joint 15. The relative positions of the upper release claw 13 and the lower release claw 14 are as follows: when the lever on the quick connector 11 is located at the end of the groove on the roller 12 away from the deep pit, the upper release claw 13 is in a position horizontal to the roller axis, at which time the upper release claw 13 is open and the lower release claw 14 is retracted; when the lever is located in the deep pit of the groove on the roller 12, the lower release claw 14 is in a position horizontal to the roller axis, at which time the lower release claw 14 is open and the upper release claw 13 is retracted.

[0021] This booster is connected to a conventional eccentric bailer for polymer flooding injection wells, and the bailing process is identical to conventional operations. To baile a plug on an eccentric water distributor, the instrument is first lowered through the distributor. The upper release claw 13, blocked by the pipe wall, rotates upward, retracting into the lower connector 15, and the roller 12 stops moving. Then, when the instrument is raised to the distributor mandrel, the upper release claw 13 encounters resistance and rotates downward, opening and extending out of the lower connector 15. This drives the roller 12 to rotate, and the lever of the quick-release connector 11 is located at the end of the circular groove in the roller 12, away from the deep pit. Simultaneously, the roller 12 rotates the lower release claw 14, extending out of the lower connector 15. However, the torsion spring allows the claw 14 to rotate downward, without affecting the instrument's lifting motion. The instrument is raised to an appropriate distance from the distributor (less than the typical 7 meters), and then lowered to baile the plug on the distributor's eccentric hole. When lowered through the φ46 mandrel of the water distributor, lower release claw 14 encounters resistance and rotates upward and inward, retracting into lower connector 15. At this point, the lever of quick connector 11, pushed by compression spring 10, enters the deep pit of the circular arc groove of roller 12. Since connecting rod 5 and quick connector 11 are initially locked by steel ball 8, when quick connector 11 descends into the deep pit of the groove, steel ball 8 loses its support and expands outward, causing connecting rod 5 to separate from quick connector 11. The connecting rod 5 and short piston 3 move upward under the action of release spring 4, accelerating the discharge of liquid from main body 2 upward through the drainage hole in the side wall. According to Newton's third law, the well fluid exerts an equal downward thrust on the instrument, thereby assisting the instrument's descent and providing a boosting force.

Claims

1. A polymer flooding injection well plugging and fishing booster, comprising a main body (2), the lower end of which is connected to a lower joint (15) via a coupling (6), characterized in that: A short piston (3) is provided inside the main body (2), the lower end of the short piston (3) is connected to a connecting rod (5), and the lower end of the connecting rod (5) is externally connected to a quick-release joint (11); a protruding lever (17) is provided at the lower end of the quick-release joint (11), the lower joint (15) is internally connected to a roller (12) via a horizontal rotating shaft, and a rotatable upper release claw (13) and a lower release claw (14) are connected to the roller (12), and a groove is provided on the outer surface of the roller (12), and the lever (17) is located in the groove.

2. The polymer flooding injection well plugging and catching booster according to claim 1, characterized in that: The groove on the roller (12) is along the circumferential direction of the roller, and a deep pit is provided at one end of the groove, and the radial depth of the deep pit is greater than the depth of the other end of the groove.

3. The polymer flooding injection well plugging and bailing booster according to claim 2, characterized in that: When the shift lever (17) is located in the deep pit of the roller (12) groove, the quick connector (11) is separated from the connecting rod (5); when the shift lever (17) is located outside the deep pit of the roller (12) groove, the quick connector (11) is connected to the connecting rod (5).

4. The polymer flooding injection well plugging and catching booster according to claim 3, characterized in that: The upper release claw (13) and the lower release claw (14) are respectively connected to the roller (12) via a rotating shaft, and a torsion spring is provided on the rotating shaft. Under the action of the torsion spring, the upper release claw (13) and the lower release claw (14) are opened outward.

5. The polymer flooding injection well plugging and catching booster according to claim 4, characterized in that: The side wall of the lower joint (15) is opened relative to the roller (12). When the upper release claw (13) and the lower release claw (14) are opened, their ends extend out of the outer wall of the lower joint (15) from the opening.

6. The polymer flooding injection well plugging and catching booster according to claim 5, characterized in that: The relative positions of the upper release claw (13) and the lower release claw (14) are as follows: when the lever on the quick connector (11) is located at the end of the roller (12) groove away from the deep pit, the upper release claw (13) is in a position horizontal to the roller shaft, at which time the upper release claw (13) is opened and the lower release claw (14) is retracted; when the lever is located in the deep pit of the roller (12) groove, the lower release claw (14) is in a position horizontal to the roller shaft, at which time the lower release claw (14) is opened and the upper release claw (13) is retracted.

7. The polymer flooding injection well plugging and bailing booster according to claim 6, characterized in that: The outer surface of the lower end of the connecting rod (5) is provided with a plurality of axial grooves, and a locking sleeve (7) is provided inside the quick connector (11). The side wall of the locking sleeve (7) is provided with a plurality of spherical grooves corresponding to the axial grooves of the connecting rod (5), and steel balls (8) are provided in the spherical grooves. A spring (9) is provided between the bottom surface of the locking sleeve (7) and the quick connector (15).

8. The polymer flooding injection well plugging and catching booster according to claim 7, characterized in that: A compression spring (10) is provided between the upper end surface of the quick-release connector (11) and the lower end surface of the coupling (6).

9. The polymer flooding injection well plugging and bailing booster according to claim 8, characterized in that: A release spring (4) is provided between the short piston (3) and the upper end surface of the coupling (6).

10. The polymer flooding injection well plugging and catching booster according to claim 9, characterized in that: When the quick connector (11) enters the deep pit of the groove, the connecting rod (5) is separated from the quick connector (11), and the connecting rod (5) and the short piston (3) move upward under the action of the release spring (4), accelerating the liquid in the main body (2) to be discharged upward through the drainage hole on the side wall. The well fluid generates an equal downward thrust on the instrument, thereby helping the instrument to move downward.

Images