Oil recovery device

Abstract

The invention discloses an oil recovery device, comprising an upper cylinder (10) and an oil pipe oil recovery mechanism (20) arranged up and down; the oil pipe oil recovery mechanism (20) comprises a central tube (22), a first half oil recovery pump (25) and a second half oil recovery pump (28) are arranged outside the central tube (22), a rubber tube strip (26) is arranged on the first half oil recovery pump (25) and the second half oil recovery pump (28), and the first half oil recovery pump (25) can move relative to the second half oil recovery pump (28) along the axis direction of the central tube (22). The oil recovery device can effectively clean the oil wax crystals and dirt on the inner wall of the casing in the heavy oil well, and solves the problem that the heavy oil well oil recovery operation needs to repeatedly scrape the pipe and wash the well.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, in particular to an oil recovery device. Background Art

[0002] At present, in the oil recovery operation of heavy oil wells, there is a problem that scraping and washing the pipe is ineffective. Repeated scraping and washing are required before the oil recovery tool can be smoothly lowered to the expected depth. The workload is large and the construction period is long, which affects the success rate of the operation. Summary of the invention

[0003] In order to improve the effect of oil recovery operation in heavy oil wells, the present invention provides an oil recovery device, which can effectively clean the oil wax crystals and dirt on the inner wall of the casing in the heavy oil well, solving the problem that the oil recovery operation in the heavy oil well needs repeated scraping and well washing.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An oil scavenging device comprises an upper cylinder body and an oil pipe oil scavenging mechanism arranged up and down; a bypass hole is arranged in the side wall of the upper cylinder body, a check valve is arranged in the bypass hole, and liquid outside the upper cylinder body can enter the upper cylinder body through the check valve; the oil pipe oil scavenging mechanism comprises a central tube, a first half oil scavenging pump and a second half oil scavenging pump are arranged outside the central tube, and rubber tube strips are arranged on the first half oil scavenging pump and the second half oil scavenging pump, and the first half oil scavenging pump can move relative to the second half oil scavenging pump along the axial direction of the central tube.

[0006] The upper cylinder is in an upright state, the bypass hole is in an inclined state, and the inner end of the bypass hole is higher than the outer end of the bypass hole.

[0007] The central tube is in an upright state, and the first half oil puller and the second half oil puller are symmetrically arranged on the left and right sides of the central tube, and the first half oil puller and the second half oil puller are mirror images of each other.

[0008] The first half oil pump is connected with the second half oil pump to form a complete cylinder sleeved outside the central tube. The outer surface of the central tube is provided with a first track groove, and the first half oil pump is matched and connected with the first track groove.

[0009] The first track slide groove is arranged along the axial direction of the central tube, the first track slide groove penetrates the outer surface of the central tube, and the cross section of the first track slide groove is dovetail-shaped or T-shaped.

[0010] The outer surface of the central tube is also provided with a second track slide groove, and the second half oil scoop is matched and connected with the second track slide groove, and the second half oil scoop can move along the axial direction of the central tube.

[0011] The first track slide groove and the second track slide groove are symmetrically arranged on the left and right sides of the central tube, and the first track slide groove and the second track slide groove are mirror images of each other.

[0012] A limiting protrusion is provided outside the second track slide groove, which can prevent the second half oil pump from moving along the axial direction of the central tube. Along the axial direction of the central tube, the moving range of the first half oil pump is greater than that of the second half oil pump.

[0013] The first half oil pump comprises an expanded neck section, an equal diameter section and a reduced neck section connected in sequence from top to bottom. The rubber tube strip is fixed in the equal diameter section. The rubber tube strip is a semicircular ring structure. The outer diameter of the rubber tube strip is greater than the outer diameter of the equal diameter section.

[0014] An upper joint section is arranged at the upper end of the upper cylinder, a lower joint section is arranged at the lower end of the upper cylinder, an upper joint is arranged at the upper end of the central pipe, a lower joint is arranged at the lower end of the central pipe, and the lower joint section is connected to the upper joint through an oil pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. It is used to effectively clean the wax crystals and dirt on the inner wall of the casing during oil well fishing operations.

[0017] 2. By using the oil recovery device, the oil wax in the casing is recovered from the ground, solving the problem of repeated operations during the oil recovery process in heavy oil wells.

[0018] 3. It effectively solves the problem that the trial fishing after scraping, drilling and hot washing of heavy oil wells cannot be successful at one time, and it needs repeated hot washing and tripping of the pipe string to pass the trial fishing. It effectively solves the problem of low work efficiency and high labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is a schematic diagram of the upper cylinder of the oil recovery device of the present invention.

[0021] Figure 2 It is a schematic diagram of the oil pipe oil catching mechanism of the oil catching device of the present invention.

[0022] Figure 3 yes Figure 2 Cross-sectional view of the center tube along the AA direction.

[0023] Figure 4 It is a schematic diagram of the connection between the first half oil pump and the second half oil pump and the central pipe.

[0024] 10. Upper cylinder; 11. Upper joint section; 12. Side wall; 13. Bypass hole; 14. Valve ball; 15. Check valve; 16. Lower joint section;

[0025] 20. Oil pipe oil catching mechanism; 21. Upper joint; 22. Center pipe; 23. Second track slide; 24. Limiting protrusion; 25. First half of oil catching puller; 26. Rubber tube strip; 27. Lower joint; 28. Second half of oil catching puller; 29. ​​First track slide. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] An oil scavenging device comprises an upper cylinder 10 and an oil pipe scavenging mechanism 20 arranged in an upper and lower manner; a bypass hole 13 is arranged in a side wall 12 of the upper cylinder 10, a check valve 15 is arranged in the bypass hole 13, and liquid outside the upper cylinder 10 can enter the upper cylinder 10 through the check valve 15; the oil pipe scavenging mechanism 20 comprises a central tube 22, a first half oil scavenging puller 25 and a second half oil scavenging puller 28 are arranged outside the central tube 22, and a rubber drum strip 26 is arranged on the first half oil scavenging puller 25 and the second half oil scavenging puller 28, and the first half oil scavenging puller 25 can move relative to the second half oil scavenging puller 28 along the axial direction of the central tube 22, such as Figure 1 and Figure 2 shown.

[0028] In this embodiment, the upper cylinder 10 is in an upright state, the bypass hole 13 is in an inclined state, and the inner end of the bypass hole 13 is higher than the outer end of the bypass hole 13. The check valve 15 includes a valve ball 14 and a valve seat, and the liquid can only flow into the upper cylinder 10 from the outside of the upper cylinder 10 through the check valve 15, but cannot flow from the inside of the upper cylinder 10 to the outside of the upper cylinder 10 through the check valve 15.

[0029] The function of the check valve 15 is that when the well is being cleaned, the valve ball 14 sits on the valve seat under the action of its own weight and the flow pressure of the well repair fluid, and the check valve 15 is in a closed state to seal the oil pipe. When the oil pipe column is lifted up, the liquid level in the casing rises and the pressure increases. When the casing pressure is greater than the pressure of the oil pipe liquid column and the dead weight of the valve ball 14, the liquid in the casing pushes the valve ball 14 open and enters the oil pipe.

[0030] In this embodiment, an upper joint section 11 is provided at the upper end of the upper cylinder 10, and a lower joint section 16 is provided at the lower end of the upper cylinder 10. Both the upper joint section 11 and the lower joint section 16 are provided with external threads. When in use, the upper joint section 11 is connected to the upper oil pipe through a thread, and the lower joint section 16 is connected to the lower oil pipe through a thread.

[0031] In this embodiment, the central tube 22 is in an upright state, the axis of the central tube 22 coincides with the axis of the upper cylinder 10, the first half oil pump 25 and the second half oil pump 28 are symmetrically arranged on the left and right sides of the central tube 22, and the first half oil pump 25 and the second half oil pump 28 are mirror images of each other.

[0032] In this embodiment, the cross-sections of the first half oil pump 25 and the second half oil pump 28 are both semicircular ring structures. The first half oil pump 25 and the second half oil pump 28 are connected to form a complete cylindrical object that is sleeved outside the central tube 22. The rubber tube strip 26 on the first half oil pump 25 and the rubber tube strip on the second half oil pump 28 can be connected to form a complete sealing rubber ring. The outer surface of the central tube 22 is provided with a first track groove 29, and the inner part of the first half oil pump 25 is matched and plugged into the first track groove 29.

[0033] In this embodiment, the first track groove 29 is arranged along the axial direction of the central tube 22, and the first track groove 29 passes through the outer surface of the central tube 22, that is, the first track groove 29 is opened from the upper end of the central tube 22 to the lower end of the central tube 22. The cross-section of the first track groove 29 can be dovetail-shaped or T-shaped to prevent the first half oil pump 25 from detaching from the central tube 22.

[0034] In this embodiment, the outer surface of the central tube 22 is further provided with a second track groove 23, and the second half oil extraction puller 28 is matched and connected with the second track groove 23, and the second half oil extraction puller 28 can also move along the axial direction of the central tube 22, such as Figure 2 , Figure 3 and Figure 4 shown.

[0035] Although the first half oil pump 25 and the second half oil pump 28 can both move along the axial direction of the central tube 22, the movements of the first half oil pump 25 and the second half oil pump 28 are independent of each other, that is, when the first half oil pump 25 moves, the second half oil pump 28 can remain stationary; when the first half oil pump 25 remains stationary, the second half oil pump 28 can move.

[0036] In this embodiment, the first rail groove 29 and the second rail groove 23 are symmetrically arranged on the left and right sides of the central tube 22, and the connecting line between the first rail groove 29 and the second rail groove 23 intersects with the axis of the central tube 22, and the first rail groove 29 and the second rail groove 23 are mirror images of each other.

[0037] In this embodiment, a limiting protrusion 24 is provided outside the second track slide groove 23, and the limiting protrusion 24 can prevent the second half oil pump 28 from moving along the axial direction of the central tube 22. Along the axial direction of the central tube 22, the moving range of the first half oil pump 25 is greater than the moving range of the second half oil pump 28.

[0038] In this embodiment, an upper joint 21 is provided at the upper end of the central tube 22, and a lower joint 27 is provided at the lower end of the central tube 22. Along the axial direction of the central tube 22, the movement range of the first half oil scoop 25 is between the upper joint 21 and the lower joint 27, and the movement range of the second half oil scoop 28 is between the limiting protrusion 24 and the lower joint 27. The movement range of the first half oil scoop 25 is 50% to 150% of the length of the first half oil scoop 25, and the movement range of the second half oil scoop 28 is 5% to 15% of the length of the first half oil scoop 25.

[0039] In this embodiment, the first half oil extraction pump 25 comprises an expanded neck section, an equal diameter section and a reduced neck section which are sequentially connected from top to bottom. The rubber tube strip 26 is fixed in the equal diameter section. A rubber tube strip mounting groove is provided in the equal diameter section. The rubber tube strip 26 is a semicircular ring structure. The outer diameter of the rubber tube strip 26 is larger than the outer diameter of the equal diameter section. The outer diameter of the rubber tube strip 26 is larger than the outer diameter of the upper cylinder body 10.

[0040] The upper and lower ends of the central tube 22 are provided with external threads. The lower part of the upper joint 21 of the oil pipe oil recovery mechanism 20 is connected to the central tube 22 by threads, and the upper part of the upper joint 21 is connected to the lower part of the upper cylinder 10 by oil pipes. The distance between the upper cylinder 10 and the oil pipe oil recovery mechanism 20 is about 200 meters. The limit protrusion 24 makes the moving range of the first half oil recovery pump 25 and the second half oil recovery pump 28 different, which is convenient for the tool to be lowered into the well and reduces friction resistance. The rubber tube strip 6 is installed in the first half oil recovery pump 25 and the second half oil recovery pump 28. It is made of rubber and plays the role of sealing the annulus of the oil casing. The lower joint 27 is connected to the central tube 22 by threads.

[0041] The working process of the oil recovery device is introduced below.

[0042] The oil scooping device is lowered to a predetermined position through the oil pipe. During the lowering process, the first half oil scooping puller 25 and the second half oil scooping puller 28 are relatively staggered under the action of the limiting protrusion 24 and the friction force of the inner wall of the casing, that is, the upper end of the first half oil scooping puller 25 abuts against the upper joint 21, and the second half oil scooping puller 28 abuts against the limiting protrusion 24.

[0043] The well is flushed with a large displacement until the water quality at the inlet and outlet is consistent. The oil pipe is lifted, and the first half oil pump 25 and the second half oil pump 28 move downward relatively under the action of the liquid column resistance and the friction force of the inner wall of the casing, that is, the first half oil pump 25 and the second half oil pump 28 are both in contact with the lower joint 27, and the first half oil pump 25 and the second half oil pump 28 form a complete cylindrical shape, and the rubber tube strip 26 also forms a complete circular sealing ring. The rubber tube strip 26 is attached to the inner wall of the casing, scrapes the oil wax on the inner wall of the casing and drives it upward.

[0044] The oil pipe continues to go up, and when the casing liquid column pressure is greater than the casing liquid column pressure and the deadweight of the valve ball 14, the liquid in the casing pushes the valve ball 14 into the oil pipe. After the upper cylinder 10 is lifted out of the casing, the oil wax about 200 meters above the oil recovery device is completely brought out of the ground, achieving the effect of cleaning the inner wall of the casing, and also completing one oil recovery.

[0045] The oil recovery device has a novel structure and reliable working performance. It is an indispensable supporting tool in the oil recovery operation of oil wells. Through the use of the oil recovery device, it effectively solves the problem that the trial recovery after scraping pipes, clearing wells, and hot washing in heavy oil wells cannot be successful at one time, and repeated hot washing and lifting of the pipe string are required to pass the trial recovery. It effectively solves the problems of low work efficiency and high labor intensity.

[0046] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. An oil recovery device, characterized in that: The oil catching device comprises an upper cylinder (10) and an oil pipe oil catching mechanism (20) arranged up and down; A bypass hole (13) is provided in the side wall (12) of the upper cylinder (10), and a check valve (15) is provided in the bypass hole (13). Liquid outside the upper cylinder (10) can enter the upper cylinder (10) through the check valve (15), and liquid inside the upper cylinder (10) cannot flow out of the upper cylinder (10) through the check valve (15); The oil pipe oil scavenging mechanism (20) comprises a central pipe (22), a first half oil scavenging puller (25) and a second half oil scavenging puller (28) are arranged outside the central pipe (22), a rubber tube strip (26) is arranged on the first half oil scavenging puller (25) and the second half oil scavenging puller (28), and the first half oil scavenging puller (25) can move relative to the second half oil scavenging puller (28) along the axial direction of the central pipe (22); The upper cylinder (10) is in an upright state, the bypass hole (13) is in an inclined state, and the inner end of the bypass hole (13) is higher than the outer end of the bypass hole (13); An upper joint section (11) is provided at the upper end of the upper cylinder (10), a lower joint section (16) is provided at the lower end of the upper cylinder (10), an upper joint (21) is provided at the upper end of the center tube (22), a lower joint (27) is provided at the lower end of the center tube (22), and the lower joint section (16) is connected to the upper joint (21) through an oil pipe; The central tube (22) is in an upright state, and the first half oil extraction unit (25) and the second half oil extraction unit (28) are symmetrically arranged on the left and right sides of the central tube (22), and the first half oil extraction unit (25) and the second half oil extraction unit (28) are mirror images of each other; The first half oil pump (25) and the second half oil pump (28) are connected to form a complete cylinder sleeved outside the central tube (22); the outer surface of the central tube (22) is provided with a first track groove (29); the first half oil pump (25) and the first track groove (29) are matched and connected; The first track groove (29) is arranged along the axial direction of the central tube (22), the first track groove (29) penetrates the outer surface of the central tube (22), and the cross section of the first track groove (29) is dovetail-shaped or T-shaped; The outer surface of the central tube (22) is also provided with a second track groove (23), and the second half oil extraction pump (28) is matched and connected with the second track groove (23), and the second half oil extraction pump (28) can move along the axial direction of the central tube (22); The first rail chute (29) and the second rail chute (23) are symmetrically arranged on the left and right sides of the central tube (22), and the first rail chute (29) and the second rail chute (23) are mirror images of each other; A limiting protrusion (24) is provided outside the second track slide groove (23), and the limiting protrusion (24) can prevent the second half oil pump (28) from moving along the axial direction of the central tube (22). Along the axial direction of the central tube (22), the moving range of the first half oil pump (25) is greater than the moving range of the second half oil pump (28); The first half oil extraction pump (25) comprises an expanded neck section, an equal diameter section and a reduced neck section which are sequentially connected from top to bottom. A rubber tube strip (26) is fixed in the equal diameter section. The rubber tube strip (26) is a semicircular ring structure. The outer diameter of the rubber tube strip (26) is greater than the outer diameter of the equal diameter section.

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