Efficient oil well pump structure

Abstract

The invention discloses a high-efficiency oil well pump structure, relates to the technical field of oil well pumps, and aims to solve the technical problem that the oil pumping efficiency is affected due to frequent overhaul and maintenance times. The high-efficiency oil well pump structure comprises a pump rod, an oil pipe sealing joint is arranged on the periphery of the lower half part of the pump rod, and threads are reserved at the upper end of the oil pipe sealing joint and connected with an upper oil pipe; an outer sleeve is arranged at the bottom end of the oil pipe sealing connector, a lower connecting body is installed at the bottom end of the outer sleeve, a flow dividing device is arranged on the lower connecting body, a pump cylinder is sleeved with the inner circumference of the outer sleeve, the pump rod is connected with a pump core, a moving one-way valve is arranged in the pump core, and a flow dividing piece is arranged between the flow dividing device and the lower connecting body. By means of the integrated design of the outer sleeve and the flow dividing device, flow dividing and pressure reducing of liquid are achieved, the ascending resistance of the liquid when the pump core descends can be effectively improved, impact borne by the pump core is reduced, use stability is guaranteed, and the service life of the whole oil well pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well pumps, and more particularly to a high-efficiency oil well pump structure. Background Art

[0002] The oil well pump refers to an underground device driven by the pumping unit to lift the crude oil in the well to the ground. The main structure of the existing oil well pump is composed of a pump rod, a pump barrel, a pump core, a floating check valve, and a fixed check valve. The specific connection is: the upper end of the pump barrel is connected to the oil pipe above, and the lower end is connected to the sand screen; the upper end of the pump core is connected to the pump rod. Because a channel is set at the place where the pump core and the pump rod are connected, the oil well pump, especially the small-diameter oil well pump, has the problem of resistance when the pump core goes down and the lower liquid goes up. Therefore, this is the weakest point. In field applications, many oil well pumps are broken at this position, causing maintenance and shutdown, affecting the oil pumping efficiency.

[0003] The Chinese invention patent with publication number CN202310428264.6 adds a single-flow pressure relief unit and sets eight second one-way valves to divert the oil production. However, the second one-way valve is easily damaged in actual use, and the impurity particles in the oil will wear the second one-way valve. If any of the eight second one-way valves is damaged, the oil production efficiency will be reduced. In serious cases, the equipment will be shut down for maintenance. Therefore, multiple second one-way valves are prone to shortening the service life. At the same time, the second one-way valve cannot block the reflux oil after being worn. When multiple second one-way valves have problems, the oil pumping efficiency is seriously affected. In addition, there is no way to perform real-time detection and maintenance on the second one-way valve, which affects the oil pumping efficiency. In view of this, we propose a high-efficiency oil pump structure. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, meet actual needs, and provide a high-efficiency oil pump structure to solve the current technical problem of frequent inspections and repairs that affect oil pumping efficiency.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-efficiency oil pump structure, including a pump rod, a pipe sealing joint is provided on the outer periphery of the lower half of the pump rod, a thread is left on the upper end of the pipe sealing joint and is connected to the upper pipe, an outer sleeve is provided at the bottom end of the pipe sealing joint, a lower connector is installed at the bottom end of the outer sleeve, a diverter device is provided on the lower connector, a pump barrel is provided on the inner periphery of the outer sleeve, the pump rod is connected to a pump core, a floating one-way valve is provided in the pump core, the lower connector forms a whole with the outer sleeve and the pump barrel, and a diverter device is provided between the diverter device and the lower connector.

[0006] Preferably, the diverter component includes multiple baffles in the diverter device and a ball seat 1 below each baffle, a one-way ball valve 1 is arranged between the multiple baffles and the corresponding ball seat 1, and multiple ball seats 2 are arranged inside the lower connecting body, and a one-way ball valve 2 is arranged at the position of the multiple ball seats 2.

[0007] Preferably, the diverter component includes multiple baffles in the diverter device and a ball seat 1 below the diverter device, and the spaces between the multiple baffles and the ball seat 1 are each provided with a one-way ball valve 1. There are multiple ball seats 2 inside the lower connecting body, and the spaces between the multiple ball seats 2 and the ball seat 1 are each provided with a one-way ball valve 2.

[0008] Preferably, a communicating hole is provided on the side wall of the lower half of the oil pipe sealing joint, and a sealing member is provided between the oil pipe sealing joint and the outer sleeve.

[0009] Preferably, a middle large hole and peripheral small holes are opened in the center and periphery of the diversion device, and a formation connection area, a convergence area, a bypass annulus area, and a pump core area are arranged between the pump barrel and the lower connecting body. The middle large hole is connected to the bypass annulus area, the bottom of the peripheral small hole is connected to a one-way ball valve 2, and the top of the peripheral small hole is connected to the pump core.

[0010] Preferably, the diameter of the middle large hole is larger than the peripheral small holes, the number of the peripheral small holes is at least one, and the center of the baffle is designed to be hollow.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention realizes the diversion and decompression of liquid through the integrated design of the outer sleeve and the diversion device, which can effectively improve the resistance of the liquid upward when the pump core is downward, and also reduces the impact on the pump core. At the same time, by optimizing the structure, the number of equipment maintenance caused by damage to the one-way valve is reduced, the stability of use is guaranteed, and the overall service life of the oil pump is extended.

[0013] At the same time, the multi-channel design of the diversion device avoids the problem of oil pump failure caused by blockage of a single channel and improves the reliability of the equipment.

[0014] Due to the improved pumping efficiency, the structure can extract more formation fluid in the same time, thereby reducing the operating time and energy consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the coaxial double-tube single ball of the present invention;

[0016] Figure 2 is a schematic diagram of the cross-sectional structure of the baffle in the present invention;

[0017] Figure 3This is a schematic diagram of the structure of the coaxial double-tube multi-ball of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the first form of the diversion device in the present invention;

[0019] Figure 5 It is a structural schematic diagram of the second form of the diversion device in the present invention;

[0020] Figure 6 It is a schematic structural diagram of the third form of the diversion device in the present invention.

[0021] Explanation of the numbers in the figure: 1. Pump rod; 2. Oil pipe sealing joint; 3. Seal; 4. Outer sleeve; 5. Pump barrel; 6. Pump core; 7. Floating one-way valve; 21. Diverter; 22. Baffle; 23. Lower connector; 24. One-way ball valve 1; 25. Ball seat 1; 26. One-way ball valve 2; 27. Threaded part; 31. Formation connection area; 32. Convergence area; 33. Bypass annulus area; 34. Pump core area. DETAILED DESCRIPTION

[0022] In order to solve the resistance of liquid upward when the pump core is moving downward, the available space in the existing pump core has reached its limit, and the only solution is to use diversion. Therefore, we can only find a solution outside the pump body, or we can use a parallel single-tube or multi-tube solution.

[0023] like Figures 1 to 6 As shown, the present invention relates to a high-efficiency oil pump structure, including a pump rod 1, which is connected to the upper end of a pump core 6 and can move up and down in a pump barrel 5. A floating one-way valve 7 is arranged in the pump core 6. An oil pipe sealing joint 2 is fixedly arranged on the outer periphery of the lower half of the pump rod 1. The side wall of the lower half of the oil pipe sealing joint 2 is provided with a connecting hole. The number of connecting holes is not limited. Specifically, the connecting holes can be arranged to be uniformly opened along the circumference of the side wall; the upper end of the oil pipe sealing joint 2 is provided with a thread and connected to the upper oil pipe, and the oil pipe sealing joint 2 and the upper end of the outer sleeve 4 are connected by a sealing member 3 After the sealing is completed, the lower end of the pump barrel 5 is connected to the diverter device 21, the lower end of the outer sleeve 4 is connected to the upper end of the lower connector 23, and a threaded portion 27 is provided on the inner periphery of the bottom end of the lower connector 23 to facilitate the connection. At the same time, the lower connector 23 is connected to the diverter device 21, so that the lower connector 23, the outer sleeve 4 and the pump barrel 5 form a whole, and the outer sleeve 4 is sleeved on the outside of the pump barrel 5; the lower end of the lower connector 23 can be connected to the screen tube or to other sand control devices, and a diverter is provided between the diverter device 21 and the lower connector 23.

[0024] The position of the outer sleeve 4 on the outside of the pump barrel 5 is relatively flexible and can be set according to actual needs. There are two specific positions: coaxial or non-coaxial. In the case of coaxial setting, the central axis of the outer sleeve coincides or substantially coincides with the central axis of the pump barrel, as shown in FIG. Figure 1As shown; in the case of a non-coaxial arrangement, the central axis of the outer sleeve does not coincide with the central axis of the pump barrel, and there is a certain offset or angle, which is not shown in the relevant drawings in the present invention.

[0025] The diverter component includes a baffle 22 located in the diverter device 21 and a ball seat 25 located below the diverter device 21, a one-way ball valve 24 is arranged between the baffle 22 and the ball seat 25, a ball seat 2 is arranged inside the lower connecting body 23, a one-way ball valve 26 is arranged between the ball seat 2 and the ball seat 25, the center of the baffle 22 is designed to be hollow, the baffle 22 matched with the one-way ball valve 24 is shaped to increase the permeability of the liquid, and the one-way ball valve 24 and the one-way ball valve 26 are both one-way valves.

[0026] A middle large hole and peripheral small holes are provided at the center and periphery of the diversion device 21. A formation connection area 31, a convergence area 32, a bypass annulus area 33, and a pump core area 34 are provided between the pump barrel 5 and the lower connector 23. The middle large hole is connected to the bypass annulus area 33 (the gap space between the outer casing 4 and the pump barrel 5), which is connected to the bottom one-way ball valve 24. After passing through the one-way ball valve 24, the oil turns right and then enters the bypass annulus. The bottom of the peripheral small holes is connected to the one-way ball valve 2 26, and the top of the peripheral small holes is connected to the bottom of the pump core 6, and they are connected.

[0027] The connecting formation area 31 is connected to the formation, the convergence area 32 is above the one-way ball valve 26, and is also a convergence area connecting the formation area 31 and the convergence area 32, the bypass annulus area 33 is connected to the bypass annulus of the diversion, and the pump core area 34 is below the pump core 6.

[0028] When the pump core 6 moves upward, the one-way ball valve 26 is open. At this time, the oil enters the convergence area 32 from the connecting formation area 31, and then enters the pump core area 34, but does not enter the bypass annulus area 33 at this time. During the downward process of the pump core 6, part of the oil enters the convergence area 32 from the pump core area 34, and then enters the bypass annulus area 33. Because the one-way ball valve 26 is closed at this time, it will not enter the connecting formation area 31. At the same time, during the downward process, the oil will enter the top of the pump core 6 through the floating one-way valve 7, and another part of the oil will enter the bypass annulus area 33 through the one-way ball valve 1 24. The bypass annulus area 33 passes through the connecting hole of the oil pipe sealing joint 2, and then merges with the oil above the pump core 6 into the oil pipe sealing joint 2.

[0029] As for the specific sizes of the floating check valve 7, the one-way ball valve 1 24 and the one-way ball valve 2 26, the one-way ball valve 2 26 is larger than the one-way ball valve 1 24 and the floating check valve 7. The specific sizes need to be calculated based on the cross-sectional area of ​​the oil circulation, because the oil coming in from the one-way ball valve 26 goes up to the three areas of the convergence area 32, the bypass annulus area 33 and the pump core area 34. The one-way ball valve 26 is larger in size, which reduces the resistance to the oil circulation.

[0030] It should be noted that the diameter of the middle large hole is larger than the peripheral small holes, the number of peripheral small holes is at least one, and through holes of different shapes can meet the needs, the middle large hole can also be arranged on one side, and the middle hole can be provided with a single one-way valve, double one-way valves or multiple one-way valves, such as Figure 4 , Figure 5 and Figure 6 .

[0031] In the second embodiment, in order to extend the service life and reduce the frequency of overhaul and maintenance, the number of diverter components is designed differently from the above structure. The diverter components include a plurality of baffles 22 in the diverter device 21 and a ball seat 25 below each baffle 22, wherein one baffle 22 and the adjacent ball seat 25 below are matched as a group, which can be set as multiple groups according to actual conditions, and a one-way ball valve 24 is set in the space between the baffle 22 and the ball seat 25 in each group; a plurality of ball seats 2 are arranged inside the lower connector 23, and a one-way ball valve 26 is set at the position of the plurality of ball seats 2. It should be noted that the number of the one-way ball valve 24 and the one-way ball valve 26 is two or more, and the specific number can be selected according to the needs, and the number of the one-way ball valve 24 and the one-way ball valve 26 does not need to be limited to the same; at the same time, the positions of the plurality of one-way ball valves 24 or the plurality of one-way ball valves 26 in the axial direction of the pump rod 1 do not require strict alignment, and can be flexibly aligned or have a certain offset to meet different fluid control needs.

[0032] Therefore, if one of the one-way ball valves 24 is worn out and cannot be closed normally, that is, one of the one-way ball valves 24 cannot close the channel, the other one-way ball valves 24 can still play the role of opening and closing, and the entire sucker rod can still work normally, and the oil in the bypass branch flows evenly. Similarly, multiple one-way ball valves 26 can be set to avoid affecting the normal oil pumping work due to the wear of one of them.

[0033] Working principle: This embodiment provides a high-efficiency oil pump structure. When in use,

[0034] S1. Connect the whole structure first, check that all ball valves (such as one-way ball valve 1 24, one-way ball valve 2 26, etc.) are in the closed state, and wait for the oil pump to start working.

[0035] S2. When the pump rod 1 is lifted, the pump core 6 is driven upward. Since the gap between the pump core 6 and the pump barrel 5 is very small, a low-pressure area will be generated under the pump core 6. In this way, the high-pressure oil flow of the formation will pass through the one-way ball valve 26, and then enter the small peripheral channel of the diversion device 21 to enter the bottom of the pump core 6. When the pump core 6 moves to the top, the bottom of the pump core 6 will also be filled with formation liquid. During this process, the one-way ball valve 24 and the floating one-way valve 7 are both in a closed state to prevent the liquid above the pump core 6 from flowing back.

[0036] When the pump core 6 moves to the top and is about to move downward, the one-way ball valve 26 is closed to prevent the liquid from returning to the formation.

[0037] S3, when the pump rod 1 moves downward, it pushes the pump core 6 downward, and the liquid below the pump core 6 is squeezed to form a high-pressure area. When the pressure is higher than the pressure above the one-way ball valve 24 and the floating one-way valve 7, one of the liquids passes through the one-way ball valve 24 and enters the one-way ball valve 24, then enters the annulus between the outer sleeve 4 and the pump barrel 5, and then enters the inner hole of the oil pipe sealing joint 2. The other liquid passes through the floating one-way valve 7 and enters the pump core 6, continues to flow upward and merges with the liquid entering the oil pipe sealing joint 2, and is finally discharged to the ground until the pump core 6 reaches the lowest part. In this process, the one-way ball valve 24 and the floating one-way valve 7 are both in the open state.

[0038] S4, re-entering the above-mentioned upward state, during the upward process, the floating one-way valve 7 and the one-way ball valve 24 are in the closed state, and the liquid on the one-way valve is squeezed by the volume of the pump core 6, so the formation liquid will also be discharged to the ground during the upward movement.

[0039] Through the continuous upward and downward movement of the pump core 6, the formation liquid will continuously enter the pump, and then be discharged to the ground through the annulus of the oil pipe and the pump rod 1, thereby realizing continuous oil pumping.

[0040] The working cooperation of each ball valve and the pump core 6 is further summarized and described:

[0041] The coordination between pump core 6 and floating check valve 7:

[0042] When the pump moves upward, the floating one-way valve 7 is closed to prevent the liquid above the pump core 6 from flowing back.

[0043] When descending, the floating check valve 7 opens, allowing the liquid below the pump core 6 to be squeezed into the annular space inside the pump core 6.

[0044] The cooperation between the pump core 6 and the one-way ball valve 24:

[0045] When the pump moves upward, the one-way ball valve 24 is closed to prevent the liquid from flowing back from the high-pressure area above the pump core 6 to the low-pressure area below the one-way ball valve 24.

[0046] When descending, the one-way ball valve 24 opens, allowing the liquid below the pump core 6 to enter the area above the one-way ball valve 24.

[0047] The cooperation between the pump core 6 and the one-way ball valve 26:

[0048] When moving upward, the one-way ball valve 26 opens, allowing the high-pressure oil flow from the formation to enter the small peripheral channel of the diversion device 21.

[0049] When descending, the one-way ball valve 26 is closed to prevent the liquid from flowing back into the formation.

[0050] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A high-efficiency oil well pump structure, characterized in that: The invention comprises a pump rod (1), wherein an oil pipe sealing joint (2) is provided on the outer periphery of the lower half of the pump rod (1), wherein the upper end of the oil pipe sealing joint (2) is provided with a thread and is connected to the upper oil pipe, wherein an outer sleeve (4) is provided at the bottom end of the oil pipe sealing joint (2), wherein a lower connecting body (23) is installed at the bottom end of the outer sleeve (4), wherein a flow dividing device (21) is provided on the lower connecting body (23), wherein a pump barrel (5) is sleeved on the inner periphery of the outer sleeve (4), wherein the pump rod (1) is connected to a pump core (6), wherein a floating one-way valve (7) is provided in the pump core (6), wherein the lower connecting body (23) forms a whole with the outer sleeve (4) and the pump barrel (5), and wherein a flow dividing member is provided between the flow dividing device (21) and the lower connecting body (23).

2. A high-efficiency oil well pump structure according to claim 1, characterized in that: The flow dividing member comprises a baffle (22) located in the flow dividing device (21) and a ball seat (25) located below the flow dividing device (21), a one-way ball valve (24) being arranged between the baffle (22) and the ball seat (25), a ball seat (2) being arranged inside the lower connecting body (23), and a one-way ball valve (26) being arranged between the ball seat (2) and the ball seat (25).

3. The high-efficiency oil well pump structure according to claim 1, characterized in that: The flow dividing member comprises a plurality of baffles (22) in the flow dividing device (21) and a ball seat (25) below each baffle (22), a one-way ball valve (24) being arranged between each of the plurality of baffles (22) and the corresponding ball seat (25), a plurality of ball seats (2) being arranged inside the lower connecting body (23), and a one-way ball valve (26) being arranged at each of the plurality of ball seats (2).

4. A high-efficiency oil well pump structure according to claim 2 or 3, characterized in that: A communicating hole is provided on the side wall of the lower half of the oil pipe sealing joint (2), and a sealing member (3) is provided between the oil pipe sealing joint (2) and the outer sleeve (4).

5. A high-efficiency oil well pump structure according to claim 4, characterized in that: The diversion device (21) is provided with a middle large hole and peripheral small holes. A formation connection area (31), a convergence area (32), a bypass annulus area (33), and a pump core area (34) are provided between the pump barrel (5) and the lower connecting body (23). The middle large hole is connected to the bypass annulus area (33). The bottom of the peripheral small hole is connected to a one-way ball valve 2 (26), and the top of the peripheral small hole is connected to the pump core (6).

6. A high-efficiency oil well pump structure according to claim 5, characterized in that: The diameter of the middle large hole is larger than the peripheral small holes, the number of the peripheral small holes is at least one, and the center of the baffle (22) is designed to be hollow.

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