Long plunger ring-sealed strongly-closed swirl pump

Abstract

The present invention relates to the technical field of oil extraction equipment, and particularly relates to a long plunger ring-sealed forced-closure swirl pump. The device includes a plunger assembly and a pump barrel assembly, and the plunger assembly is installed inside the pump barrel assembly; the plunger assembly includes an upper plunger forced-closure valve, a plunger, and a lower plunger valve, and the pump barrel assembly includes a pump barrel. Annular sealing rings are respectively installed in the upper ring-sealed installation chamber and the lower ring-sealed installation chamber, the annular sealing rings are sleeved on the plunger, and a ring-sealed spring is installed outside the annular sealing rings, and the ring-sealed spring applies a pressure to the annular sealing rings towards the plunger. The present invention realizes a combination of soft and hard seals between the pump barrel and the plunger, can automatically compensate for the clearance loss between the pump barrel and the plunger, has a good sealing effect, further improves the pump efficiency, and the sand scraping cups at both ends can automatically remove the sand and paraffin on the surface of the plunger, has a good sand prevention effect, enables the plunger to move freely, and prolongs the pump inspection period.

Description

Technical Field:

[0001] The present invention relates to the technical field of oil extraction equipment, and particularly to a long plunger ring seal forced-closure swirl pump. Background Art:

[0002] Currently, in the exploitation of gas-containing wells and oil wells with a small amount of sand, a forced-start and forced-closure exploitation method is adopted. However, for sand-containing gas wells, the sucker rod pump cannot achieve a sand control effect, and the pump efficiency is low. If only the operation method with a short pump barrel is adopted, it cannot achieve the automatic compensation effect of soft sealing, and cannot automatically scrape sand, failing to reach an ideal exploitation effect. Summary of the Invention:

[0003] The technical problem to be solved by the present invention is to provide a long plunger ring seal forced-closure swirl pump. This device realizes a combination of hard and soft seals between the pump barrel and the plunger, can automatically compensate for the gap loss between the pump barrel and the plunger, has a good sealing effect, further improves the pump efficiency, and the sand scraping cups at both ends can automatically remove the sand and paraffin on the surface of the plunger, with a good sand control effect, enabling the plunger to move freely and extending the pump inspection period. It overcomes the deficiencies that the sucker rod pump used in the exploitation of existing sand-containing gas wells cannot achieve a sand control effect, has a low pump efficiency, and cannot achieve the automatic compensation effect of soft sealing when adopting the structure of a short pump barrel, failing to reach an ideal exploitation effect.

[0004] The technical solution adopted by the present invention is: a long plunger ring seal forced-closure swirl pump, including a plunger assembly and a pump barrel assembly, and the plunger assembly is installed inside the pump barrel assembly; the plunger assembly includes an upper plunger forced-closure valve, a plunger, and a lower plunger valve, and the lower end of the upper plunger forced-closure valve is connected to the plunger, and the lower end of the plunger is connected to the lower plunger valve;

[0005] The pump barrel assembly includes a pump barrel, and the outer walls of the upper and lower ends of the pump barrel are respectively connected to an upper ring seal box joint and a lower ring seal box joint. The upper end of the upper ring seal box joint is connected to an upper sand scraping cup joint, and the lower end of the lower ring seal box joint is connected to a lower sand scraping cup joint. An upper ring seal installation chamber is formed between the inner wall of the upper ring seal box joint and the outer wall of the plunger, and a lower ring seal installation chamber is formed between the inner wall of the lower ring seal box joint and the outer wall of the plunger. Annular sealing rings are respectively installed in the upper ring seal installation chamber and the lower ring seal installation chamber. The annular sealing rings are sleeved on the plunger, and a ring seal spring is installed outside the annular sealing rings. The ring seal spring applies a pressure to the annular sealing rings towards the plunger; a sand scraping cup is respectively sleeved on the upper end of the upper sand scraping cup joint and the lower end of the lower sand scraping cup joint. The sand scraping cup can scrape the sand on the surface of the plunger. The outer wall of the upper end of the upper sand scraping cup joint is connected to an upper collar, and the outer wall of the lower end of the lower sand scraping cup joint is connected to a pump barrel extension pipe through a lower collar. The lower end of the pump barrel extension pipe is connected to a forced-closure fixed valve assembly through an extension pipe collar.

[0006] Further, the upper plunger forced closing valve includes a plunger upper forced closing valve cover. A plunger spring is installed inside the plunger upper forced closing valve cover. The lower end of the plunger spring is installed on a plunger spring seat. A plunger upper valve ball is arranged at the lower end of the plunger spring seat. The plunger upper valve seat is arranged on the inner wall step of the plunger upper forced closing valve cover and is limited and fixed by the upper end face of a plunger upper valve cover joint. The upper end of the plunger upper valve cover joint is threadedly connected to the inner wall of the plunger upper forced closing valve cover. The lower end of the plunger upper valve cover joint is connected to the upper end of the plunger. The plunger upper valve ball is seated on the plunger upper valve seat under the action of the plunger spring seat and the plunger spring.

[0007] Further, the lower plunger valve includes a plunger lower valve cover. The upper end of the plunger lower valve cover is connected to the plunger through a plunger joint. The inner wall at the upper end of the plunger lower valve cover is connected with a plunger oil outlet baffle. Multiple oil outlet channels are formed in the plunger oil outlet baffle. A plunger lower valve ball is arranged inside the plunger lower valve cover. The plunger lower valve seat is arranged on the inner wall step of the plunger lower valve cover and is limited and fixed by the upper end face of a plunger lower pressing cap. The upper end of the plunger lower pressing cap is threadedly connected to the inner wall of the plunger lower valve cover. The plunger lower valve ball can be seated on the plunger lower valve seat.

[0008] Further, the length of the pump barrel is 1.2 meters, and the length of the plunger is greater than 4.5 meters.

[0009] Further, the forced closing fixed valve assembly includes a fixed valve ball, a fixed valve seat and a fixed cover. The upper end of the fixed cover is connected to an extension pipe coupling through a fixed cover upper joint. A limiting ring is arranged at the center of the upper end of the fixed cover. The upper end of a reset rod penetrates into the limiting ring. A reset spring is sleeved on the reset rod. Spring seats are respectively arranged at the upper and lower ends of the reset spring. The spring seats are sleeved on the reset rod. The upper spring seat abuts against the end face of the limiting ring under the action of the reset spring. The lower spring seat abuts against the step face of the reset rod under the action of the reset spring. The lower end of the reset rod penetrates into a fixed ball cage. The lower end of the fixed ball cage is arranged at the inner wall step face of the fixed cover. The fixed valve seat is arranged at the inner wall step at the lower end of the fixed ball cage. A fixed valve male snap cap is connected to the inner wall at the lower end of the fixed cover and limits and fixes the fixed ball cage and the fixed valve seat. The fixed valve ball is arranged inside the fixed ball cage. The fixed valve ball is seated on the fixed valve seat under the action of the reset rod and the reset spring. Multiple rotating channels are evenly formed on the side wall of the fixed ball cage.

[0010] The beneficial effects of the present invention are as follows:

[0011] 1. The short pump barrel seal achieves the effect of hard seal. The annular seal can automatically compensate for the gap loss between the pump barrel and the plunger, further improving the pump efficiency.

[0012] 2. The sand scraping cups at both ends can automatically remove the sand and paraffin on the surface of the plunger, enabling the plunger to move freely and extending the pump inspection period.

[0013] 3. The forced closing fixed valve assembly adopts a forced closing swirl structure, enabling the liquid flow entering the oil pump to have its own swirl, which plays a role in flushing the fixed valve.

[0014] 4. The upper end of the plunger assembly adopts an upper plunger forced-closure valve, and the lower end of the pump barrel assembly adopts a forced-closure fixed valve assembly. The above-mentioned forced-closure structure has the effect of preventing gas and pumping thick oil by itself, further expanding the application range of the oil pump, and is widely used in thin oil wells, thick oil wells and sand-containing gas wells. Brief Description of the Drawings:

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] Figure 1 It is a structural schematic diagram of the present invention. Specific Embodiments:

[0017] As Figure 1 shown, a long plunger ring seal forced-closure swirl pump includes a plunger assembly and a pump barrel assembly. The plunger assembly is installed inside the pump barrel assembly; the plunger assembly includes an upper plunger forced-closure valve, a plunger 12 and a lower plunger valve. The lower end of the upper plunger forced-closure valve is connected to the plunger 12, and the lower end of the plunger 12 is connected to the lower plunger valve.

[0018] The pump barrel assembly includes a pump barrel 11. The outer walls of the upper and lower ends of the pump barrel 11 are respectively connected to an upper ring seal box joint 10 and a lower ring seal box joint 32. The upper end of the upper ring seal box joint 10 is connected to an upper sand scraping cup joint 9, and the lower end of the lower ring seal box joint 32 is connected to a lower sand scraping cup joint 33. An upper ring seal installation chamber is formed between the inner wall of the upper ring seal box joint 10 and the outer wall of the plunger 12, and a lower ring seal installation chamber is formed between the inner wall of the lower ring seal box joint 32 and the outer wall of the plunger 12. Annular sealing rings 14 are respectively installed in the upper ring seal installation chamber and the lower ring seal installation chamber. The annular sealing rings 14 are sleeved on the plunger 12, and a ring seal spring 13 is installed outside the annular sealing rings 14. The ring seal spring 13 applies a pressure to the annular sealing rings 14 towards the plunger 12; sand scraping cups 8 are respectively sleeved on the upper end of the upper sand scraping cup joint 9 and the lower end of the lower sand scraping cup joint 33. The sand scraping cups 8 can scrape sand on the surface of the plunger 12. The outer wall of the upper end of the upper sand scraping cup joint 9 is connected to an upper collar 7, and the outer wall of the lower end of the lower sand scraping cup joint 33 is connected to a pump barrel extension pipe 16 through a lower collar. The lower end of the pump barrel extension pipe 16 is connected to a forced-closure fixed valve assembly through an extension pipe collar 22.

[0019] The upper plunger forced-closure valve includes a plunger upper forced-closure valve cover 1. A plunger spring 2 is installed inside the plunger upper forced-closure valve cover 1. The lower end of the plunger spring 2 is installed on a plunger spring seat 3. A plunger upper valve ball 4 is arranged at the lower end of the plunger spring seat 3. A plunger upper valve seat 5 is arranged on the inner wall step of the plunger upper forced-closure valve cover 1 and is limited and fixed by the upper end face of a plunger upper valve cover joint 6. The upper end of the plunger upper valve cover joint 6 is threadedly connected to the inner wall of the plunger upper forced-closure valve cover 1, and the lower end of the plunger upper valve cover joint 6 is connected to the upper end of the plunger 12. The plunger upper valve ball 4 is seated on the plunger upper valve seat 5 under the action of the plunger spring seat 3 and the plunger spring 2.

[0020] The lower plunger valve includes a lower plunger valve cover 18. The upper end of the lower plunger valve cover 18 is connected to the plunger 12 through a plunger joint 15. The inner wall of the upper end of the lower plunger valve cover 18 is connected to a plunger oil outlet baffle 17. A plurality of oil outlet channels are formed in the plunger oil outlet baffle 17. A plunger lower valve ball 19 is arranged in the lower plunger valve cover 18. A plunger lower valve seat 20 is arranged on the inner wall step of the lower plunger valve cover 18 and is limited and fixed by the upper end face of a plunger lower pressing cap 21. The upper end of the plunger lower pressing cap 21 is threadedly connected to the inner wall of the lower plunger valve cover 18. The plunger lower valve ball 19 can be seated on the plunger lower valve seat 20.

[0021] The length of the pump barrel 11 is 1.2 meters, and the length of the plunger 12 is greater than 4.5 meters.

[0022] The forced-closure fixed valve assembly includes a fixed valve ball 28, a fixed valve seat 29, and a fixed cover 30. The upper end of the fixed cover 30 is connected to an extension pipe coupling 22 through a fixed cover upper joint 23. A limiting ring is provided at the center of the upper end of the fixed cover 30. The upper end of a return rod 24 passes through the limiting ring. A return spring 25 is sleeved on the return rod 24. Spring seats 26 are respectively arranged at the upper and lower ends of the return spring 25. The spring seats 26 are sleeved on the return rod 24. The upper spring seat 26 abuts against the end face of the limiting ring under the action of the return spring 25, and the lower spring seat 26 abuts against the step surface of the return rod 24 under the action of the return spring 25. The lower end of the return rod 24 passes through a fixed ball cage 27. The lower end of the fixed ball cage 27 is arranged at the inner wall step surface of the fixed cover 30. The fixed valve seat 29 is arranged at the inner wall step at the lower end of the fixed ball cage 27. A fixed valve male snap cap 31 is connected to the inner wall at the lower end of the fixed cover 30 to limit and fix the fixed ball cage 27 and the fixed valve seat 29. The fixed valve ball 28 is arranged in the fixed ball cage 27. The fixed valve ball 28 is seated on the fixed valve seat 29 under the action of the return rod 24 and the return spring 25. A plurality of rotating channels are evenly formed on the side wall of the fixed ball cage 27.

[0023] In use, the pump barrel assembly is connected to the lower end of the tubing string and lowered to the designed depth along with the tubing string. The plunger assembly is connected to the lower end of the sucker rod, lowered into the well along with the sucker rod, and enters the pump barrel assembly. After the bumping operation, it reciprocates up and down together with the sucker rod. The pump barrel 11 provides a hard seal for the plunger 12. A seal ring spring 13 is installed outside the annular seal ring 14, and the seal ring spring 13 applies a pressure to the annular seal ring 14 towards the plunger 12. The annular seal ring 14 provides a soft seal for the plunger 12. Under the action of the seal ring spring 13, the annular seal ring 14 can automatically compensate for the clearance loss between the pump barrel 11 and the plunger 12, further improving the pump efficiency. The sand scraping cups 8 at both ends can automatically remove the sand and paraffin on the surface of the plunger 12, enabling the plunger 12 to move freely and extending the pump inspection period. When the fixed valve assembly is admitting oil, the incoming oil flow pushes open the fixed valve ball 28 and enters the fixed ball cage 27. A plurality of rotating channels are evenly formed on the side wall of the fixed ball cage 27. The incoming oil flow flows out through the above-mentioned rotating channels to form a swirling flow, enabling the incoming liquid flow of the oil pump to carry its own swirling flow, which serves to wash the fixed valve. The upper end of the plunger assembly adopts an upper plunger strong closing valve, and the lower end of the pump barrel assembly adopts a strong closing fixed valve assembly. The above-mentioned strong closing structure has its own effect of preventing gas and pumping thick oil, further expanding the application range of the oil pump, and it is widely used in thin oil wells, thick oil wells and sand-containing gas wells.

[0024] It can be understood that the above specific description of the present invention is only for explaining the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as it meets the usage requirements, it is within the protection scope of the present invention.

Claims

1. A long plunger ring-sealed strongly closed swirl pump, comprising a plunger assembly and a pump barrel assembly, and the plunger assembly is installed inside the pump barrel assembly; Characterized in that: The plunger assembly includes an upper plunger strong closing valve, a plunger (12) and a lower plunger valve. The lower end of the upper plunger strong closing valve is connected to the plunger (12), and the lower end of the plunger (12) is connected to the lower plunger valve; The pump barrel assembly includes a pump barrel (11). The outer walls of the upper and lower ends of the pump barrel (11) are respectively connected to an upper ring-sealing box joint (10) and a lower ring-sealing box joint (32). The upper end of the upper ring-sealing box joint (10) is connected to an upper sand scraping cup joint (9), and the lower end of the lower ring-sealing box joint (32) is connected to a lower sand scraping cup joint (33). An upper ring-sealing installation chamber is formed between the inner wall of the upper ring-sealing box joint (10) and the outer wall of the plunger (12), and a lower ring-sealing installation chamber is formed between the inner wall of the lower ring-sealing box joint (32) and the outer wall of the plunger (12). Annular sealing rings (14) are respectively installed in the upper ring-sealing installation chamber and the lower ring-sealing installation chamber. The annular sealing rings (14) are sleeved on the plunger (12), and a ring-sealing spring (13) is installed outside the annular sealing rings (14). The ring-sealing spring (13) applies a pressure to the annular sealing rings (14) towards the plunger (12); Sand scraping cups (8) are respectively sleeved on the upper ends of the upper sand scraping cup joint (9) and the lower ends of the lower sand scraping cup joint (33). The sand scraping cups (8) can scrape sand on the surface of the plunger (12). The outer wall of the upper end of the upper sand scraping cup joint (9) is connected to an upper collar (7), and the outer wall of the lower end of the lower sand scraping cup joint (33) is connected to a pump barrel extension pipe (16) through a lower collar. The lower end of the pump barrel extension pipe (16) is connected to a strongly closed fixed valve assembly through an extension pipe collar (22).

2. The long plunger ring-sealed strongly closed swirl pump according to claim 1, Characterized in that: The upper plunger strong closing valve includes a plunger upper strong closing valve cover (1). A plunger spring (2) is installed inside the plunger upper strong closing valve cover (1). The lower end of the plunger spring (2) is installed on a plunger spring seat (3). A plunger upper valve ball (4) is arranged at the lower end of the plunger spring seat (3). A plunger upper valve seat (5) is arranged on the inner wall step of the plunger upper strong closing valve cover (1) and is limited and fixed by the upper end face of a plunger upper valve cover joint (6). The upper end of the plunger upper valve cover joint (6) is threadedly connected to the inner wall of the plunger upper strong closing valve cover (1), and the lower end of the plunger upper valve cover joint (6) is connected to the upper end of the plunger (12). The plunger upper valve ball (4) is seated on the plunger upper valve seat (5) under the action of the plunger spring seat (3) and the plunger spring (2).

3. The long plunger ring-sealed strongly closed swirl pump according to claim 1, Characterized in that: The lower plunger valve includes a lower plunger valve cover (18). The upper end of the lower plunger valve cover (18) is connected to the plunger (12) through a plunger joint (15). The inner wall of the upper end of the lower plunger valve cover (18) is connected to a plunger oil outlet stopper (17). A plurality of oil outlet channels are formed in the plunger oil outlet stopper (17). A plunger lower valve ball (19) is arranged in the lower plunger valve cover (18). A plunger lower valve seat (20) is arranged on the inner wall step of the lower plunger valve cover (18) and is limited and fixed by the upper end face of a plunger lower pressing cap (21). The upper end of the plunger lower pressing cap (21) is threadedly connected to the inner wall of the lower plunger valve cover (18). The plunger lower valve ball (19) can be seated on the plunger lower valve seat (20).

4. The long plunger ring-sealing and strongly-closed swirl pump according to claim 1, characterized in that: the length of the pump barrel (11) is 1.2 meters, and the length of the plunger (12) is greater than 4.5 meters.

5. The long plunger ring-sealing and strongly-closed swirl pump according to claim 1, characterized in that: the strongly-closed fixed valve assembly includes a fixed valve ball (28), a fixed valve seat (29) and a fixed cover (30). The upper end of the fixed cover (30) is connected to an extended pipe coupling (22) through an upper joint of the fixed cover (23). A limiting ring is provided at the center of the upper end of the fixed cover (30). The upper end of a return rod (24) penetrates into the limiting ring. A return spring (25) is sleeved on the return rod (24). Spring seats (26) are respectively arranged at the upper and lower ends of the return spring (25). The spring seats (26) are sleeved on the return rod (24). The upper spring seat (26) abuts against the end face of the limiting ring under the action of the return spring (25), and the lower spring seat (26) abuts against the step face of the return rod (24) under the action of the return spring (25). The lower end of the return rod (24) penetrates into a fixed ball cage (27). The lower end of the fixed ball cage (27) is arranged at the inner wall step of the fixed cover (30). The fixed valve seat (29) is arranged at the inner wall step of the lower end of the fixed ball cage (27). A fixed valve male snap ring (31) is connected to the inner wall of the lower end of the fixed cover (30) to limit and fix the fixed ball cage (27) and the fixed valve seat (29). The fixed valve ball (28) is arranged in the fixed ball cage (27). The fixed valve ball (28) is seated on the fixed valve seat (29) under the action of the return rod (24) and the return spring (25). A plurality of rotating channels are evenly formed on the side wall of the fixed ball cage (27).

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