A rod pump lifting oil-water separation device in tubing

Abstract

The present application belongs to the technical field of oil exploitation equipment, and particularly relates to a rod pump lifting oil-water separation device in a tubing, aiming at solving the problem of poor oil-water separation effect. The present application comprises a well pipe assembly, an uphole assembly, a pumping assembly and a separation assembly. The well pipe assembly comprises an oil layer casing, an inner pipe and an outer pipe, and the inner pipe wall is provided with a water outlet hole. The uphole assembly comprises a Christmas tree, a ground water outlet pipe and a ground oil outlet pipe. The pumping assembly comprises a pumping rod. The separation assembly comprises a hole sealing sliding sleeve, an oil collecting structure, a connecting pipe and an oil collecting structure. The hole sealing sliding sleeve is slidingly connected with the inner wall of the inner pipe and closes the water outlet hole by sliding. The inner wall of the oil collecting structure is provided with flexible fibers for adsorbing oil. The connecting pipe is sleeved on the pumping rod, and the oil collecting structure is arranged below the connecting pipe. The flexible fibers on the oil collecting structure are extruded when the oil collecting structure rises. The present application can improve the separation efficiency, and ensure that the water quality and oil quality after separation can reach or exceed the design standard.

Description

Technical Field

[0001] This invention belongs to the technical field of oil extraction equipment, and specifically relates to an oil-water separation device for lifting oil pipes with a rod pump. Background Technology

[0002] As oil fields enter the middle and late stages of development, the water cut of oil wells is high. Wells with high water cut face challenges in terms of energy consumption and economic costs in areas such as lifting, oil-water separation, water treatment, and water reinjection. Technological innovation and management optimization are needed to reduce costs and improve efficiency.

[0003] Downhole oil-water separation is an emerging oilfield produced fluid treatment technology, an important means to solve the problems of high economic costs, high energy consumption, and environmental pollution caused by high water cut in oil wells during the middle and late stages of oil production. This technology involves installing an oil-water separator inside the wellbore, separating most of the water from the produced fluid and injecting it directly into the formation, while only lifting the oil-rich portion to the surface.

[0004] Currently, most domestic oil-water separation technologies are applied to electric submersible centrifugal pumps and electric submersible screw pumps, primarily employing centrifugal separation techniques. However, there are relatively few technologies available for oil-water separation within the wellbore of rod-lift wells. Some technologies utilize the density difference between oil and water for passive oil-water separation, but these processes are complex, yield poor separation results, and fail to achieve the designed objectives. Furthermore, for single-well point production wells, the produced fluid is typically separated at the surface, requiring the construction of large tanks and other facilities, resulting in a large land area and significant safety hazards. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, namely poor oil-water separation performance, this invention provides an oil-water separation device within a rod pump lifting oil pipe. Aiming to maximize the oil-water separation effect of the rod pump while reducing energy consumption and environmental pollution, it utilizes common oleophilic flexible fibers to adsorb, filter, and enrich oil in the water. Through an innovative separation mechanism, it improves separation efficiency, ensuring that the quality of both the separated water and oil meets or exceeds design standards. While improving separation efficiency, it also reduces the need for ground-based facilities, lowers energy consumption, and minimizes environmental pollution.

[0006] This application discloses an oil-water separation device for lifting oil pipes using a rod pump, employing the following technical solution:

[0007] A rod pump lifting tubing oil-water separation device includes a well tubing assembly, a wellhead assembly, a pumping assembly, and a separation assembly;

[0008] The well casing assembly includes an oil layer casing disposed below the ground surface, an inner tube inserted in the oil layer casing, and an outer tube disposed between the inner tube and the oil layer casing. A water outlet hole is provided through the tube wall of the inner tube to connect the inner tube and the outer tube.

[0009] The wellhead assembly includes a Christmas tree, a surface water outlet pipe, and a surface oil outlet pipe, which are arranged on the surface and fixedly connected to the inlet pipe assembly. One end of the surface water outlet pipe is fixed to the Christmas tree, and the gap between the surface water outlet pipe and the outer and inner pipes is connected. The other end of the surface water outlet pipe is connected to a water container. One end of the surface oil outlet pipe is fixed to the Christmas tree, and the surface oil outlet pipe is connected to the inner pipe.

[0010] The oil pumping assembly includes a sucker rod inserted through the wellhead and connected to the plunger of the downhole pump. The separation assembly includes a sealing sleeve, an oil collecting structure, a connecting pipe, and an oil retrieval structure installed in the inner tube. The sealing sleeve is annular and fitted onto the sucker rod, with a gap between the sealing sleeve and the sucker rod. The sealing sleeve is slidably connected to the inner wall of the inner tube and seals the water outlet through sliding. The oil collecting structure is annular and fitted onto the sucker rod, with a gap between the oil collecting structure and the sucker rod. The oil collecting structure is arranged below the sealing sleeve and spaced apart from it. The oil collecting structure is fixedly connected to the inner wall of the inner tube. Flexible fibers for absorbing oil are provided on the inner wall of the oil collecting structure. The connecting pipe is fitted onto the sucker rod, and the oil retrieval structure is arranged below the connecting pipe. When the oil retrieval structure rises, it squeezes the flexible fibers on the oil collecting structure. A check valve is installed on the surface oil outlet pipe.

[0011] By adopting the above technical solution, when the produced fluid enters the oil collection structure, it is adsorbed by the flexible fibers in the oil collection structure, achieving oil-water separation. When the oil recovery structure has not yet come into contact with the oil collection structure and the sealing sleeve has not risen, the water outlet is in the open state. At this time, the produced fluid, which has been adsorbed and filtered by the oil collection structure, will enter the annulus formed by the outer and inner pipes along the water outlet, and then enter other processes along the surface water outlet pipe. When the sucker rod drives the connecting pipe to rise, the sealing sleeve moves upward, blocking the water outlet, which is equivalent to closing the water outlet channel. At this time, the connecting sleeve drives the oil recovery structure to rise, forming an oil outlet path along the surface oil outlet pipe. At the same time, the oil recovery structure will squeeze the flexible fibers on the oil collection structure, and the crude oil adsorbed on the flexible fibers will eventually rise along the inner pipe, enter the surface oil outlet pipe, and finally enter the surface oil collection pipeline. As the sucker rod descends and pulls the connecting pipe down with it, the sealing sleeve descends, opening the water outlet and reducing the pressure. The check valve then closes the oil outlet passage, and the rod continues to descend until it separates from the oil collection structure, preparing for the next cycle of oil-water separation.

[0012] Optionally, the oil-collecting structure includes multiple connecting rods and a connecting plate fixedly connected to the connecting rods;

[0013] One end of the connecting rod is hinged to the outer wall of the connecting pipe with the hinge direction upward. The connecting plate is fan-shaped and is fixedly connected to the lower side of the connecting rod.

[0014] By adopting the above technical solution, when the sucker rod drives the oil-collecting structure upward, the connecting plates are resisted by the downward direction of the oil and water, causing multiple connecting plates to flip downward and to the open position. This increases the outer diameter of the oil-collecting structure, allowing it to contact and compress the flexible fibers on the oil-collecting structure. When the sucker rod drives the oil-collecting structure downward, the connecting plates are buoyed by the upward direction of the oil and water, causing multiple connecting plates to flip upward and to the convergent position. This reduces the outer diameter of the oil-collecting structure, minimizing contact between the oil-collecting structure and the flexible fibers as it passes through the oil-collecting structure, thus facilitating its passage.

[0015] Optionally, the plurality of connecting plates are overlapped together.

[0016] Optionally, a spring is provided on the upper side of the connecting rod. One end of the spring is fixedly connected to the connecting rod body, and the other end is fixedly connected to the outer wall of the connecting tube. When the spring is in a balanced state, the connecting rod tilts upward.

[0017] Optionally, the connecting plate is configured as an upwardly curved arc plate.

[0018] By adopting the above technical solution, the connecting plate can be easily opened during the upward process.

[0019] Optionally, a lower retaining ring and an upper retaining ring are installed on the inner wall of the inner tube. The lower retaining ring and the upper retaining ring are fixedly connected to the inner wall of the inner tube, and the water outlet is arranged between the upper retaining ring and the lower retaining ring. The inner ring diameter of the sealing sleeve is smaller than the inner ring diameter of the lower retaining ring and the upper retaining ring. When the sealing sleeve contacts the upper retaining ring, it blocks the water outlet on the lower side of the upper retaining ring.

[0020] Optionally, the sealing sleeve is configured as an elastic sleeve, and the inner ring surface undergoes elastic deformation after being compressed; a push plate is fixedly connected to the upper end of the connecting pipe, and the push plate is annular with an outer diameter larger than the inner diameter of the sealing sleeve.

[0021] By adopting the above technical solution, when the sucker rod drives the connecting pipe to rise, the push plate follows the connecting pipe to rise and pushes the sealing sleeve. When the sealing sleeve contacts the upper retaining ring, the push plate squeezes the inner ring of the sealing sleeve to deform and passes through the sealing sleeve.

[0022] By adopting the above technical solution, it is convenient to control the opening and closing of the ground oil outlet pipe and to adjust the oil outlet pipe and water outlet pipe.

[0023] Optionally, the outer tube and the inner tube are connected by a reducing joint.

[0024] Optionally, the upper end of the sucker rod is fixedly connected to a polished sucker rod, which extends out of the wellhead.

[0025] The beneficial effects of this invention are as follows: This invention aims to maximize the oil-water separation effect of a rod pump while reducing energy consumption and environmental pollution. It utilizes common oleophilic flexible fibers to adsorb, filter, and enrich oil in water. Through an innovative separation mechanism, it improves separation efficiency, ensuring that the quality of both the separated water and oil meets or exceeds design standards. While improving separation efficiency, it also reduces the need for ground-based facilities, lowers energy consumption, and minimizes environmental pollution. Attached Figure Description

[0026] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the oil-water separation device inside the rod pump lifting oil pipe in this embodiment;

[0028] Figure 2 This is a schematic diagram of the internal structure of the oil-water separation device inside the rod pump lifting oil pipe in this embodiment;

[0029] Figure 3 This is a schematic diagram of the structure of the separate component in this embodiment;

[0030] Figure 4 This is a schematic diagram of the oil collection structure in this embodiment.

[0031] Explanation of reference numerals in the attached drawings: 1. Well casing assembly; 11. Oil layer casing; 12. Inner tube; 121. Water outlet; 122. Upper retaining ring; 123. Lower retaining ring; 13. Oil tubing; 14. Outer tube; 15. Reducing joint; 2. Uphole assembly; 21. Christmas tree; 22. Surface water outlet pipe; 23. Surface oil outlet pipe; 24. Check valve; 3. Pumping assembly; 31. Smooth rod; 32. Sucker rod; 4. Separation assembly; 41. Sealing sleeve; 42. Oil gathering structure; 43. Connecting pipe; 44. Oil recovery structure; 441. Connecting rod; 442. Spring; 443. Connecting plate; 45. Push plate. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] This invention provides an oil-water separation device for lifting oil pipes of a rod pump, as described above. Figure 1 , Figure 2 The rod pump lifting tubing oil-water separation device includes a well pipe assembly 1, a wellhead assembly 2, a pumping assembly 3, and a separation assembly 4.

[0035] Reference Figure 2 The well casing assembly 1 includes an oil layer casing 11 disposed below the surface, which supports the wellbore and provides wall protection. An inner tube 12 passes through the oil layer casing 11, with a gap between the inner tube 12 and the oil layer casing 11. An oil tubing 13 is connected to the lower side of the inner tube 12, extending downhole. An outer tube 14 is fitted between the inner tube 12 and the oil layer casing 11, connected to the inner tube 12 via a reducing joint 15. A water outlet 121 is formed through the wall of the inner tube 12, connecting the inner tube 12 and the outer tube 14. Multiple water outlets 121 are provided, circumferentially formed on the wall of the inner tube 12.

[0036] The wellhead assembly 2 is located on the surface and includes a wellhead tree 21. The wellhead tree 21 is fixedly connected to the openings of the casing, inner tube 12, and outer tube 14 of the tubing 13. A surface water outlet pipe 22 and a surface oil outlet pipe 23 are installed on the wellhead tree 21. One end of the surface water outlet pipe 22 is fixed to the wellhead tree 21, and the gap between the surface water outlet pipe 22 and the outer tube 14 and inner tube 12 is open. The other end of the surface water outlet pipe 22 is connected to a water container. One end of the surface oil outlet pipe 23 is fixed to the wellhead tree 21, and the surface oil outlet pipe 23 is connected to the inner tube 12. A check valve 24 is installed on the surface oil outlet pipe 23.

[0037] The oil pumping assembly 3 includes a sucker rod 31 that is installed on the tree trunk 21. One end of the sucker rod 31 is inserted into the inner tube 12 and connected to a sucker rod 32. The sucker rod 32 is used to transmit power and is connected to the plunger of the oil pump downhole, driving the oil pump to lift oil and water and output them to the surface through the inner tube 12.

[0038] Reference Figure 2 , Figure 3 The separation component 4 includes a sealing sleeve 41, an oil collecting structure 42, a connecting pipe 43, an oil receiving structure 44, and a push plate 45 installed in the inner tube 12.

[0039] The sealing sleeve 41 is annular and is fitted onto the sucker rod 32, with a gap between the sealing sleeve 41 and the sucker rod 32. A lower retaining ring 123 and an upper retaining ring 122 are installed on the inner wall of the inner tube 12, and are fixedly connected to the inner wall of the inner tube 12. The water outlet 121 is located between the upper retaining ring 122 and the lower retaining ring 123. The inner ring diameter of the sealing sleeve 41 is smaller than the inner ring diameters of the lower retaining ring 123 and the upper retaining ring 122. When the sealing sleeve 41 is arranged in the inner tube 12, under its own weight, the sealing sleeve 41 overlaps between the lower retaining ring 123, exposing the water outlet 121. When there is a lot of oil on the lower side of the sealing sleeve 41, as the oil rises, it will push the sealing sleeve 41 upward, causing it to slide along the wall of the inner tube 12 and contact the upper retaining ring 122. When the sealing sleeve 41 contacts the upper retaining ring 122, it blocks the water outlet 121 on the lower side of the upper retaining ring 122. The sealing sleeve 41 can be set as an elastic sleeve, and the inner ring surface undergoes elastic deformation after being compressed.

[0040] The oil collecting structure 42 is annular and sleeved on the sucker rod 32, with a gap between the oil collecting structure 42 and the sucker rod 32. The oil collecting structure 42 is arranged below the sealing sleeve 41, spaced apart from it. The oil collecting structure 42 is fixedly connected to the inner wall of the inner tube 12. Flexible fibers, specifically oleophilic flexible fibers, are provided on the inner wall of the oil collecting structure 42 to adsorb oil from the oil-water mixture.

[0041] The connecting pipe 43 is sleeved on the sucker rod 32, and the connecting pipe 43 is tightly connected to the sucker rod 32. When the connecting pipe 43 is connected to the sucker rod 32, the connecting pipe 43 moves with the sucker rod 32 and does not slide on the sucker rod 32. The outer diameter of the connecting pipe 43 is smaller than the inner diameter of the sealing sleeve 41 and the oil collecting structure 42, so that the connecting pipe 43 will not contact the sealing sleeve 41 and the oil collecting structure 42 when the sucker rod 32 moves up and down.

[0042] Reference Figure 3 , Figure 4The oil-collecting structure 44 is located at the lower end of the connecting pipe 43, and when the sucker rod 32 is not raised, it is positioned below the oil-collecting structure 42, with a gap between them. When the sucker rod 32 rises, it drives the oil-collecting structure 44 to rise through the connecting pipe 43. During the rising process, the outer edge of the oil-collecting structure 44 contacts the flexible fibers on the oil-collecting structure 42, squeezing the flexible fibers and scraping off the oil adsorbed on them. The oil-collecting structure 44 includes multiple connecting rods 441. One end of each connecting rod 441 is hinged to the outer wall of the connecting pipe 43 with the hinge direction upward. The multiple connecting rods 441 are arranged at equal intervals along the circumference of the connecting pipe 43. A spring 442 is provided on the upper side of the connecting rod 441. One end of the spring 442 is fixedly connected to the connecting rod 441, and the other end is fixedly connected to the outer wall of the connecting pipe 43. When the spring 442 is in equilibrium, the connecting rod 441 tilts upward. A connecting plate 443 is fixedly connected to the connecting rod 441. The connecting plate 443 is fan-shaped and fixedly connected to the lower side of the connecting rod 441. One side of the connecting plate 443 contacts the outer wall of the connecting pipe 43. Multiple connecting plates 443 are inclined plates and overlap each other. When the sucker rod 32 drives the oil collection structure 44 to rise, the connecting plates 443 are resisted by the downward direction of oil and water, causing multiple connecting plates 443 to flip downward. Under the resistance of the spring 442, multiple connecting plates 443 flip to the open position, increasing the outer diameter of the oil collection structure 44, so that the oil collection structure 44 can contact and squeeze the flexible fibers on the oil collection structure 42. When the sucker rod 32 lowers the oil collection structure 44, the connecting plates 443 are buoyed upwards by the oil and water, causing multiple connecting plates 443 to flip upwards. Under the tension of the spring 442, the multiple connecting plates 443 flip to a converged position, reducing the outer diameter of the oil collection structure 44. This reduces the contact between the oil collection structure 44 and the flexible fiber when passing through the oil collection structure 42, facilitating the passage of the oil collection structure 44. The spring 442 prevents over-flipping of the connecting plates 443 during the upward flipping process, avoiding reverse bending of the connecting plates 443 and the connecting rod 441. By overlapping the multiple connecting plates 443, the gap between the connecting plates 443 is reduced during both opening and closing, facilitating the lifting of the oil. Furthermore, to facilitate the opening of the connecting plates 443 during the upward process, the connecting plates 443 can be designed as upwardly curved arc plates.

[0043] The push plate 45 is fixedly connected to the upper end of the connecting pipe 43. The push plate 45 is annular, and its outer diameter is larger than the inner diameter of the sealing sleeve 41. When the sucker rod 32 drives the connecting pipe 43 to rise, the push plate 45 rises with the connecting pipe 43 and pushes the sealing sleeve 41. When the sealing sleeve 41 contacts the upper retaining ring 122, the push plate 45 squeezes the inner ring of the sealing sleeve 41 to deform and passes through the sealing sleeve 41.

[0044] The method of using the oil-water separator in the lifting oil pipe of the rod pump disclosed in this application is as follows:

[0045] When the produced fluid enters the oil collection structure 42, it is adsorbed by the flexible fibers of the oil collection structure 42, achieving oil-water separation. When the oil receiving structure 44 has not yet come into contact with the oil collection structure 42 and the sealing sleeve 41 has not risen, the water outlet 121 is in the open state. Due to the pressure of the one-way valve 24, the produced fluid is blocked from flowing upward along this path. At this time, the produced fluid, which has been adsorbed and filtered by the oil collection structure 42, will enter the annulus formed by the outer pipe 14 and the inner pipe 12 along the water outlet 121, and then enter other processes along the ground water outlet pipe 22.

[0046] When the sucker rod 32 drives the connecting pipe 43 to rise, the baffle will touch the sealing sleeve 41 and drive the sealing sleeve 41 to rise, blocking the water outlet 121, which is equivalent to closing the water outlet channel. At this time, the connecting sleeve drives the oil collection structure 44 to rise. Originally, the oil collection structure 44 was in a closed state, but when the connecting pipe 43 rises, the connecting pipe 43 will drive the oil collection structure 44 to open. When the sucker rod 32 continues to rise, the one-way valve 24 will open due to the oil pressure, and an oil outlet passage will be formed along the ground oil outlet pipe 23. At the same time, the oil collection structure 44 will squeeze the flexible fiber on the oil collection structure 42, collect the crude oil and accumulate it on the oil collection structure 44, and finally rise along the inner pipe 12, enter the ground oil outlet pipe 23, and finally enter the ground oil collection pipeline.

[0047] When the sucker rod 32 descends and drives the connecting pipe 43 down together, the pusher plate 45 will drive the sealing sleeve 41 down, open the water outlet 121, reduce the pressure, close the oil outlet passage, and the oil collection structure 44 will be in a closed state. It will continue to descend until it separates from the oil collection structure 42, preparing for the next periodic oil-water separation.

[0048] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0049] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An oil-water separation device for lifting oil pipes of a rod pump, characterized in that: It includes a well casing assembly (1), a wellhead assembly (2), a pumping assembly (3), and a separation assembly (4); The well casing assembly (1) includes an oil layer casing (11) arranged below the ground, an inner tube (12) passing through the oil layer casing (11), and an outer tube (14) arranged between the inner tube (12) and the oil layer casing (11). The inner tube (12) has a water outlet hole (121) through its wall to connect the inner tube (12) and the outer tube (14). The well assembly (2) includes a wellhead (21) arranged on the ground and fixedly connected to the inlet assembly, a surface water outlet pipe (22) and a surface oil outlet pipe (23). One end of the surface water outlet pipe (22) is fixed to the wellhead (21), and the gap between the surface water outlet pipe (22) and the outer pipe (14) and the inner pipe (12) is connected. The other end of the surface water outlet pipe (22) is connected to a water container. One end of the surface oil outlet pipe (23) is fixed to the wellhead (21), and the surface oil outlet pipe (23) is connected to the inner pipe (12). The oil pumping assembly (3) includes a sucker rod (32) that passes through the tree (21) and is connected to the plunger of the downhole pump; the separation assembly (4) includes a sealing sleeve (41), an oil collecting structure (42), a connecting pipe (43), and an oil receiving structure (44) installed in the inner tube (12); the sealing sleeve (41) is annular and is fitted on the sucker rod (32), with a gap between the sealing sleeve (41) and the sucker rod (32); the sealing sleeve (41) is slidably connected to the inner wall of the inner tube (12) and seals the water outlet (121) by sliding; the oil collecting structure (42) is annular and is fitted on the inner tube (12). On the oil rod (32), there is a gap between the oil collecting structure (42) and the sucker rod (32). The oil collecting structure (42) is arranged on the lower side of the sealing sleeve (41) and spaced apart from the sealing sleeve (41). The oil collecting structure (42) is fixedly connected to the inner wall of the inner tube (12). Flexible fibers for absorbing oil are provided on the inner wall of the oil collecting structure (42). The connecting pipe (43) is sleeved on the sucker rod (32). The oil collecting structure (44) is arranged below the connecting pipe (43). When the oil collecting structure (44) rises, it squeezes the flexible fibers on the oil collecting structure (42). A one-way valve (24) is installed on the ground oil outlet pipe (23).

2. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 1, characterized in that: The oil collection structure (44) includes multiple connecting rods (441) and a connecting plate (443) fixedly connected to the connecting rods (441); One end of the connecting rod (441) is hinged to the outer wall of the connecting pipe (43) with the hinge direction upward. The connecting plate (443) is fan-shaped and is fixedly connected to the lower side of the connecting rod (441).

3. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 2, characterized in that: The multiple connecting plates (443) are overlapped together.

4. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 2, characterized in that: A spring (442) is provided on the upper side of the connecting rod (441). One end of the spring (442) is fixedly connected to the connecting rod (441), and the other end is fixedly connected to the outer wall of the connecting tube (43). When the spring (442) is in a balanced state, the connecting rod (441) tilts upward.

5. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 2, characterized in that: The connecting plate (443) is configured as an upwardly curved arc plate.

6. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 1, characterized in that: The inner wall of the inner tube (12) is equipped with a lower retaining ring (123) and an upper retaining ring (122). The lower retaining ring (123) and the upper retaining ring (122) are fixedly connected to the inner wall of the inner tube (12), and the water outlet (121) is arranged between the upper retaining ring (122) and the lower retaining ring (123). The inner ring diameter of the sealing sleeve (41) is smaller than the inner ring diameter of the lower retaining ring (123) and the upper retaining ring (122). When the sealing sleeve (41) contacts the upper retaining ring (122), it blocks the water outlet (121) on the lower side of the upper retaining ring (122).

7. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 6, characterized in that: The sealing sleeve (41) is configured as an elastic sleeve, and its inner ring surface undergoes elastic deformation after being squeezed; the upper end of the connecting pipe (43) is fixedly connected to a push plate (45), which is annular and has an outer diameter larger than the inner diameter of the sealing sleeve (41).

8. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 1, characterized in that: The outer tube (14) and the inner tube (12) are connected by a reducing joint (15).

9. The oil-water separation device in the lifting oil pipe of the rod pump according to claim 1, characterized in that: The upper end of the sucker rod (32) is fixedly connected to the sucker rod (31), and the sucker rod (31) passes through the wellhead (21).

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