Autonomous deblocking oil drainage device

Abstract

The utility model discloses a self-deblocking oil drainage device, which relates to the field of oil drainage devices and comprises an upper joint, an upper piston, an upper core tube, a lock sleeve, a deblocking pin, an anti-seating pin, a clamp spring seat, a clamp spring, an upper pressing ring, a rubber sleeve, a central tube, a lower pressing ring, an oil drainage pin and an oil drainage sleeve. The upper piston is sleeved outside the upper connector and the upper core tube, the lock sleeve is sleeved outside the upper core tube, the clamp spring seat is sleeved outside the upper core tube and fixed by the deblocking pin, the clamp spring is sleeved inside an outer groove of the clamp spring seat, the lock sleeve is sleeved outside the clamp spring seat and fixed by the anti-seating pin, the upper compression ring is sleeved outside the clamp spring seat, and the rubber sleeve is sleeved outside the clamp spring seat. The lower pressing ring is in threaded connection with the clamping spring seat, and the oil drainage sleeve is arranged outside the central pipe in a sleeving mode and fixed through an oil drainage pin. The self-deblocking oil drainage device is firm in setting, easy to deblock, capable of being lifted upwards to drain oil, simple and flexible to operate and unique and novel in design.

Description

Technical Field

[0001] The utility model relates to the field of oil drainers, in particular to an oil drainer with self-unblocking function. Background Art

[0002] An oil drainer is a downhole tool used in an oil production well in conjunction with a sucker rod pump. Usually, it is connected to the tubing above the pump and is in a closed state during normal oil production. When pulling out the tubing for pump inspection, the liquid in the tubing above the pump will be discharged into the well through the oil drainer, rather than being lifted to the ground with the tubing to cause environmental pollution. Existing oil drainers include impact type, blasting type, and pulling type structures, and the situation of non-oil discharge occurs under different well conditions. The pulling type oil drainer discharges oil when pulling out the tubing. Due to the small friction force and the high probability of early opening, most pulling type oil drainers fail. The main reason for the small friction force is the use of a spring mechanism, where the spring force is less than the self-weight, and the casing is smooth, and the shear force of the pin is greater than the friction force, resulting in the oil drainer not discharging oil. The reason for early opening is that due to the creep of the tubing string in the well, the distance between the oil discharge mechanism and the friction mechanism is relatively close, and after long-term operation, the two mechanisms come into contact and open the oil discharge hole, resulting in early oil discharge. Therefore, the main problems to be solved by the pulling type oil drainer are, first, to increase the friction force of the body to ensure that the pin can be cut when pulling out for unblocking, and second, not to open the oil drainer prematurely during downhole operation to ensure the stability of the oil drainer. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide an oil drainer with self-unblocking function, which can effectively solve the problems in the background art.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] An oil drainer with self-unblocking function, comprising an upper joint, an upper piston, an upper central tube, a locking sleeve, an unlocking pin, an anti-seating pin, a snap ring seat, a snap ring, an upper pressure ring, a rubber cylinder, a central tube, a lower pressure ring, an oil drain pin, an oil drain sleeve, a first liquid inlet hole, a second liquid inlet hole, a third liquid inlet hole, and an oil drain hole.

[0006] Preferably, the upper joint is connected to the upper central tube by threads, the upper central tube is connected to the central tube by threads, the upper piston is sleeved outside the upper joint and the upper central tube, the locking sleeve is sleeved outside the upper central tube, the snap ring seat is sleeved outside the upper central tube and fixed by the unlocking pin, the snap ring is sleeved in the outer groove of the snap ring seat, the locking sleeve is sleeved outside the snap ring seat and fixed by the anti-seating pin, the upper pressure ring is sleeved outside the snap ring seat, the rubber cylinder is sleeved outside the snap ring seat, the lower pressure ring is connected to the snap ring seat by threads, and the oil drain sleeve is sleeved outside the central tube and fixed by the oil drain pin.

[0007] Preferably, the upper core tube is provided with a first liquid inlet hole, the lock sleeve is provided with a second liquid inlet hole, the retaining spring seat is provided with a third liquid inlet hole, and the central tube is provided with an oil drain hole.

[0008] Preferably, the upper joint and the upper piston are sealed by a sealing ring, the upper core tube and the upper piston are sealed by a sealing ring, the upper core tube and the center tube are sealed by a sealing ring, and the center tube and the oil drain sleeve are sealed by a sealing ring.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] When the oil pump is in the oil pumping station, the oil pump is connected to the oil pump and lowered into the wellbore along with the pipe string. After reaching the predetermined position, the ground pump truck pressurizes the oil pipe, and water pushes the upper piston downward through the first liquid inlet hole, and the upper piston pushes the locking sleeve downward. When the pressure is increased to the rated pressure, the anti-seat pin is sheared off, the locking sleeve pushes the upper pressure ring downward, and the upper pressure ring compresses the rubber cylinder downward. The upper piston stops after it moves downward to the end face of the upper core pipe. At this time, the inner card teeth of the locking sleeve and the outer card teeth of the retaining spring bite and lock each other, and the rubber cylinder is compressed and sealed on the casing wall. The friction force of the rubber cylinder after the sealing exceeds the shear force of the oil pump pin, and the hole centers of the second liquid inlet hole and the third liquid inlet hole coincide with each other. The well fluid in the wellbore can pass through the two holes, and the well fluid between the upper and lower layers can be mutually The oil drain device is connected to each other without affecting the production, and the oil drain device is sealed; when unsealing, the oil pipe string is lifted, the upper joint moves upward, driving the upper core pipe upward, and the upper core pipe drives the center pipe and the oil drain sleeve upward. At this time, the locking sleeve, the retaining spring seat, the retaining spring, the upper pressure ring, the rubber cylinder, and the lower pressure ring are in an expansion and locking state and do not move. When the lifting force reaches the rated load, the unsealing pin is sheared off, the upper joint, the upper core pipe, the center pipe, and the oil drain sleeve move upward, and the friction force of the rubber cylinder is greater than the shear force of the oil drain pin. When the oil drain sleeve moves upward and hits the end face of the lower pressure ring, the oil drain pin is sheared off, the oil drain sleeve moves downward, leaking out the oil drain hole, and the well fluid in the oil pipe flows into the wellbore through the oil drain hole. The oil drain device completes the oil discharge, and the pipe string continues to be lifted to lift the oil drain device out.

[0011] The utility model discloses the utility model is to be lowered into the wellbore with the pipe string when setting the seal, and can be lowered into any position without the need for a ruler, and is designed with an anti-seating pin, so that the seal will not be set in advance when going down the well, causing tool failure, and the inner hole is the same size as the oil pipe, and conventional tools can pass through, and no additional tools need to be lowered for cooperation, and when oil is leaking, it is only necessary to lift the oil pipe to complete the unsealing action, and no tools need to be lowered. The specific operation of rotating the oil pipe is consistent with the pipe lifting operation in the oil field, the friction of the rubber cylinder is large when the seal is set, and the load of the oil leakage pin is small, so it is easier to complete the oil leakage action, the operation is simple and flexible, and the design is unique and novel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the overall structure of an autonomous unsealing oil drainer.

[0013] In the figure: 1. Upper joint; 2. Upper piston; 3. Upper central tube; 4. Lock sleeve; 5. Unsealing pin; 6. Anti-seating pin; 7. Circlip seat; 8. Circlip; 9. Upper pressing ring; 10. Rubber cylinder; 11. Central tube; 12. Lower pressing ring; 13. Drain pin; 14. Drain sleeve; 15. First liquid inlet hole; 16. Second liquid inlet hole; 17. Third liquid inlet hole; 18. Drain hole. Specific implementation mode

[0014] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation modes.

[0015] As Figure 1 shown, an autonomous unsealing drainer includes an upper joint 1, an upper piston 2, an upper central tube 3, a lock sleeve 4, an unsealing pin 5, an anti-seating pin 6, a circlip seat 7, a circlip 8, an upper pressing ring 9, a rubber cylinder 10, a central tube 11, a lower pressing ring 12, a drain pin 13, a drain sleeve 14, a first liquid inlet hole 15, a second liquid inlet hole 16, a third liquid inlet hole 17, and a drain hole 18; the upper joint 1 is threadedly connected to the upper central tube 3, the upper central tube 3 is threadedly connected to the central tube 11, the upper piston 2 is sleeved outside the upper joint 1 and the upper central tube 3, the lock sleeve 4 is sleeved outside the upper central tube 3, the circlip seat 7 is sleeved outside the upper central tube 3 and fixed by the unsealing pin 5, the circlip 8 is sleeved in the outer groove of the circlip seat 7, the lock sleeve 4 is sleeved outside the circlip seat 7 and fixed by the anti-seating pin 6, the upper pressing ring 9 is sleeved outside the circlip seat 7, the rubber cylinder 10 is sleeved outside the circlip seat 7, the lower pressing ring 12 is threadedly connected to the circlip seat 7, the drain sleeve 14 is sleeved outside the central tube 11 and fixed by the drain pin 13, the upper central tube 3 is provided with the first liquid inlet hole 15, the lock sleeve 4 is provided with the second liquid inlet hole 16, the circlip seat 7 is provided with the third liquid inlet hole 17, and the central tube 11 is provided with the drain hole 18.

[0016] It should be noted that the present utility model is an automatic unsealing drain valve. When in use, the drain valve is connected to the sucker rod pump and lowered into the wellbore along with the tubing string. After reaching the predetermined position, the surface pump truck pressurizes the tubing, and water pushes the piston 2 to move downward through the first liquid inlet hole 15. The upper piston 2 pushes the lock sleeve 4 to move downward. When the pressure reaches the rated pressure, the anti-seating pin 6 is sheared off, and the lock sleeve 4 moves downward to push the upper pressure ring 9. The upper pressure ring 9 moves downward to compress the rubber barrel 10. The upper piston 2 stops after moving downward to the end face of the central pipe 3. At this time, the inner locking teeth of the lock sleeve 4 and the outer locking teeth of the snap spring 8 are engaged and locked with each other. The rubber barrel 10 is compressed and expanded to seal against the casing wall. The hole centers of the second liquid inlet hole 16 and the third liquid inlet hole 17 coincide, and the well fluid in the wellbore can pass through the two holes, and the well fluid between the upper and lower layers can communicate with each other without affecting the production. The setting is completed. When unsealing, the tubing string is lifted upward. The upper joint 1 moves upward, driving the central pipe 3 to move upward. The central pipe 3 drives the central tube 11 and the drain sleeve 14 to move upward. At this time, the lock sleeve 4, the snap spring seat 7, the snap spring 8, the upper pressure ring 9, the rubber barrel 10, and the lower pressure ring 12 are in a state of expansion and locking and do not move. When the lifting force reaches the rated load, the unsealing pin 5 is sheared off. The upper joint 1, the central pipe 3, the central tube 11, and the drain sleeve 14 move upward. The frictional force of the rubber barrel 10 is greater than the shearing force of the drain pin 13. When the drain sleeve 14 moves upward and impacts the end face of the lower pressure ring 12, the drain pin 13 is sheared off, and the drain sleeve 14 moves downward, exposing the drain hole 18. The well fluid in the tubing flows into the wellbore through the drain hole 18, and the drain valve completes the drainage. The tubing string is continuously lifted to lift the drain valve out of the well.

Claims

1. An autonomous unsealing and oil discharging device, characterized in that: It includes an upper joint (1), an upper piston (2), an upper central tube (3), a locking sleeve (4), a releasing pin (5), an anti-seating pin (6), a circlip seat (7), a circlip (8), an upper pressing ring (9), a rubber cylinder (10), a central tube (11), a lower pressing ring (12), a drain pin (13), a drain sleeve (14), a first liquid inlet hole (15), a second liquid inlet hole (16), a third liquid inlet hole (17), and a drain hole (18). The upper joint (1) is threadedly connected to the upper central tube (3), and the upper central tube (3) is threadedly connected to the central tube (11). The upper piston (2) is sleeved outside the upper joint (1) and the upper central tube (3). The locking sleeve (4) is sleeved outside the upper central tube (3). The circlip seat (7) is sleeved outside the upper central tube (3) and fixed by the releasing pin (5). The circlip (8) is sleeved in the outer groove of the circlip seat (7). The locking sleeve (4) is sleeved outside the circlip seat (7) and fixed by the anti-seating pin (6). The upper pressing ring (9) is sleeved outside the circlip seat (7). The rubber cylinder (10) is sleeved outside the circlip seat (7). The lower pressing ring (12) is threadedly connected to the circlip seat (7). The drain sleeve (14) is sleeved outside the central tube (11) and fixed by the drain pin (13).

2. The self-unblocking drain valve according to claim 1, wherein: The upper central tube (3) is provided with the first liquid inlet hole (15), the locking sleeve (4) is provided with the second liquid inlet hole (16), the circlip seat (7) is provided with the third liquid inlet hole (17), and the central tube (11) is provided with the drain hole (18).

3. The self-unblocking drain valve according to claim 1, wherein: The upper joint (1) and the upper piston (2) are sealed by a sealing ring. The upper central tube (3) and the upper piston (2) are sealed by a sealing ring. The upper central tube (3) and the central tube (11) are sealed by a sealing ring. The central tube (11) and the drain sleeve (14) are sealed by a sealing ring.

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