Efficient oil pumping structure

Abstract

The utility model discloses a kind of high-efficiency oil well pump structures, it is related to oil well pump technical field, to solve the technical problem of frequent maintenance and repair frequency, influence oil pumping efficiency, including pump rod, the outer periphery of pump rod lower half is equipped with oil pipe sealing joint, the upper end of oil pipe sealing joint is left with thread and is connected with upper oil pipe, the bottom of oil pipe sealing joint is provided with outer sleeve, outer sleeve bottom end is equipped with lower connecting body, lower connecting body is provided with shunt device, outer sleeve inner periphery is equipped with pump cylinder, pump rod is connected with pump core, pump core is equipped with travelling check valve, shunt device and lower connecting body between are provided with shunt piece.The utility model is integrated design by outer sleeve and shunt device, realizes the shunt and pressure reduction to liquid, can effectively improve the resistance of liquid uplink when pump core downlink, also reduce the impact suffered by pump core, guarantee the stability of use, prolong the service life of oil well pump whole.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil well pump technology field more specifically, relate to a kind of high-efficiency oil well pump structure. BACKGROUND

[0002] Oil well pump refers to the device that is lifted to the ground by oil pumping unit in well, the main structure of current existing oil well pump is composed of pump rod, pump barrel, pump core, movable check valve, fixed check valve, specific connection is: pump barrel upper end is connected with the oil pipe above, lower end is connected with sand screen pipe;Pump core upper end is connected with pump rod. The place where pump core is connected with pump rod is set with channel, oil well pump, especially small diameter oil well pump, when pump core descends, lower liquid ascends, there is resistance problem, so this place is the weakest place, many oil well pumps are fractured in field application due to this position, causing maintenance shutdown, affecting oil pumping efficiency.

[0003] The utility model with publication number CN202310428264.6 increases single-flow pressure relief unit, sets up eight second check valves, and the oil production is shunted, but the second check valve is easily damaged in actual use, and the impurity particles in oil can wear the second check valve, and if any one of the eight second check valves is damaged, the oil production efficiency will be reduced, and the equipment will be seriously maintained and shut down, so that the service life of the multiple second check valves is easily shortened;At the same time, the second check valve cannot block the backflow of oil after wear, and when multiple second check valves are damaged, the oil pumping efficiency is seriously affected, and the second check valve cannot be detected and maintained in real time, affecting the oil pumping efficiency. In view of this, we provide a kind of high-efficiency oil well pump structure. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects of prior art, adapting to reality needs, providing a kind of high-efficiency oil well pump structure to solve the technical problems that current maintenance and repair frequency are high, affecting oil pumping efficiency.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a kind of high-efficiency oil well pump structure, including pump rod, the outer periphery of the lower half of the pump rod is equipped with oil pipe sealing joint, the upper end of the oil pipe sealing joint is left with thread and is connected with upper oil pipe, the bottom of the oil pipe sealing joint is provided with outer sleeve, the bottom of the outer sleeve is installed with lower connecting body, the lower connecting body is provided with shunt device, the inner periphery of the outer sleeve is equipped with pump barrel, the pump rod is connected with pump core, the pump core is equipped with movable check valve, the lower connecting body and outer sleeve, pump barrel form a whole, shunt device and lower connecting body between being provided with shunt piece.

[0006] Preferably, the flow divider comprises a plurality of baffles in the flow divider device and a ball seat one below each baffle, a one-way ball valve one is arranged between each of the plurality of baffles and the corresponding ball seat one, and the lower connecting body has a plurality of ball seats two inside, and a one-way ball valve two is arranged between each of the plurality of ball seats two and the ball seat one.

[0007] Preferably, the flow divider comprises a plurality of baffles in the flow divider device and a ball seat one below each baffle, a one-way ball valve one is arranged between each of the plurality of baffles and the corresponding ball seat one, and the lower connecting body has a plurality of ball seats two inside, and a one-way ball valve two is arranged between each of the plurality of ball seats two and the ball seat one.

[0008] Preferably, the lower half of the tubing seal joint has a communication hole on the side wall, and a sealing element is arranged between the tubing seal joint and the outer sleeve.

[0009] Preferably, the flow divider device is provided with a large central hole and a small peripheral hole at the center and the periphery, and the pump barrel and the lower connecting body are provided with a connected formation zone, a converging zone, a bypass annulus zone and a pump core zone, the large central hole is in communication with the bypass annulus zone, the bottom of the small peripheral hole is connected with a one-way ball valve two, and the top of the small peripheral hole is connected with a pump core.

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

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model realizes the shunting and pressure reduction of liquid through the integrated design of the outer sleeve and the flow divider device, effectively improves the resistance of liquid upward when the pump core goes down, and reduces the impact on the pump core. At the same time, through the optimization of the structure, the number of equipment maintenance caused by the damage of the one-way valve is reduced, the stability of use is ensured, and the service life of the oil pump is prolonged.

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

[0014] Due to the improvement of the oil extraction efficiency, the structure can extract more formation liquid in the same time, thereby reducing the operation time and energy consumption of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the coaxial double-tube single-ball of the utility model;

[0016] Figure 2 It is a sectional structure schematic view of the baffle in the utility model;

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

[0018] Figure 4 This is a schematic diagram of the first embodiment of the diversion device in this utility model;

[0019] Figure 5 This is a schematic diagram of the second embodiment of the diversion device in this utility model;

[0020] Figure 6 This is a schematic diagram of the third form of the diversion device in this utility model.

[0021] The following are the labels in the diagram: 1. Pump rod; 2. Oil pipe sealing joint; 3. Seal; 4. Outer sleeve; 5. Pump barrel; 6. Pump core; 7. Floating check valve; 21. Diverter; 22. Baffle; 23. Lower connector; 24. Check ball valve one; 25. Ball seat one; 26. Check ball valve two; 27. Threaded section; 31. Connecting formation area; 32. Converging area; 33. Bypass annulus area; 34. Pump core area. Detailed Implementation

[0022] To address the resistance to upward flow of liquid when the pump core moves downward, the available space inside the existing pump core has reached its limit, so a diversion solution must be adopted. Therefore, the solution must be found outside the pump body, such as using a parallel single-pipe or multi-pipe solution.

[0023] like Figures 1 to 6 As shown, this utility model 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 within a pump barrel 5. A floating one-way valve 7 is provided inside the pump core 6. An oil pipe sealing joint 2 is fixedly provided on the outer periphery of the lower half of the pump rod 1. The lower half of the oil pipe sealing joint 2 has connecting holes on its side wall; the number of connecting holes is not limited, and specifically, the connecting holes can be evenly distributed along the circumference of the side wall. The upper end of the oil pipe sealing joint 2 has threads and connects to the upper oil pipe. The oil pipe sealing joint 2 is connected to the upper end of the outer sleeve 4 via a sealing element. 3. After sealing is completed, the lower end of the pump cylinder 5 is connected to the diversion device 21, and the lower end of the outer sleeve 4 is connected to the upper end of the lower connecting body 23. The lower connecting body 23 has a threaded part 27 on the inner circumference of the bottom end for easy connection. At the same time, the lower connecting body 23 is also connected to the diversion device 21. In this way, the lower connecting body 23, the outer sleeve 4, and the pump cylinder 5 form a whole. The outer sleeve 4 is fitted on the outside of the pump cylinder 5. The lower end of the lower connecting body 23 can be connected to the screen pipe or other sand control devices. A diversion component is provided between the diversion device 21 and the lower connecting body 23.

[0024] The outer sleeve 4 is positioned relatively flexibly on the outside of the pump cylinder 5, and can be set according to actual needs. There are two possible positions: coaxial or non-coaxial. In the coaxial configuration, the central axis of the outer sleeve coincides with or substantially coincides with the central axis of the pump cylinder, just as... Figure 1As shown; in the case of non-coaxial arrangement, the central axis of the outer sleeve and the central axis of the pump barrel do not coincide, there is a certain offset or angle, the utility model does not make relevant drawing display.

[0025] The shunt includes a baffle 22 in the shunt device 21 and a ball seat 25 below the shunt device 21, a one-way ball valve 24 is arranged between the baffle 22 and the ball seat 25, the lower part of the lower connecting body 23 has a ball seat 2, 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 as an inner cavity, the one-way ball valve 24 cooperates with the baffle 22, and the shape is arranged to increase the liquid passing property, and the one-way ball valve 24 and the one-way ball valve 26 are both one-way valves.

[0026] The center and the periphery of the shunt device 21 are provided with a middle large hole and a peripheral small hole, the pump barrel 5 and the lower connecting body 23 are provided with a connecting formation zone 31, a converging zone 32, a bypass annulus zone 33 and a pump core zone 34, the middle large hole is in communication with the bypass annulus zone 33 (the gap space between the outer sleeve 4 and the pump barrel 5), it is in communication with the one-way ball valve 24 below, the oil liquid turns right after passing through the one-way ball valve 24, then enters the bypass annulus, the bottom of the peripheral small hole is connected with the one-way ball valve 26, and the top of the peripheral small hole is connected with the lower part of the pump core 6, and they are in communication.

[0027] The connecting formation zone 31 is connected with the formation, the converging zone 32 is above the one-way ball valve 26, and is also a converging area of the connecting formation zone 31 and the converging zone 32, the bypass annulus zone 33 is connected with the bypass annulus of the shunt, and the pump core zone 34 is the lower part of the pump core 6.

[0028] When the pump core 6 goes up, the one-way ball valve 26 is opened, at this time, the oil liquid enters the converging zone 32 from the connecting formation zone 31, then enters the pump core zone 34, but at this time, it cannot enter the bypass annulus zone 33, in the descending process of the pump core 6, part of the oil liquid enters the converging zone 32 from the pump core zone 34, then enters the bypass annulus zone 33, because the one-way ball valve 26 is closed at this time, so it cannot enter the connecting formation zone 31, and at the same time, in the descending process, the oil liquid enters the upper part of the pump core 6 through the floating one-way valve 7, another part of the oil liquid enters the bypass annulus zone 33 through the one-way ball valve 24, the bypass annulus zone 33 passes through the communication hole of the oil pipe sealing joint 2, and then is combined with the oil liquid above the pump core 6 into the oil pipe sealing joint 2.

[0029] The specific size of the floating one-way valve 7, the one-way ball valve 24 and the one-way ball valve 26 is one-way ball valve 26> one-way ball valve 24> floating one-way valve 7, and the specific size needs to be calculated according to the cross-sectional area of the oil liquid flow, because the oil liquid from the one-way ball valve 26 enters the converging zone 32, the bypass annulus zone 33 and the pump core zone 34, the size of the one-way ball valve 26 is large, so that the resistance of the oil liquid flow is reduced.

[0030] Need to explain, the diameter of the middle large hole is larger than the peripheral small hole, the number of peripheral small hole is at least one, and different shapes of through hole can meet the needs, the middle hole can also be arranged on one side, the middle hole can be provided with a single check valve, double check valve or multiple check valves, such as Figure 4 、 Figure 5 and Figure 6 .

[0031] The second embodiment, in order to prolong the service life and reduce the frequency of maintenance, different from the above structure, the number of shunt is designed differently, the shunt includes a plurality of baffles 22 in the shunt device 21 and a ball seat 25 below each baffle 22, one baffle 22 and the adjacent ball seat 25 below cooperate as a group, which can be set as multiple groups, and the space between the baffle 22 and the ball seat 25 in each group is provided with a one-way ball valve 24; the lower connecting body 23 has a plurality of ball seats 25, and a plurality of ball seats 25 are provided with one-way ball valves 26; it should be noted that the number of one-way ball valves 24 and one-way ball valves 26 is two or more, and the specific number can be selected according to the needs, and the number of one-way ball valves 24 and one-way ball valves 26 is not limited to be the same; at the same time, the position of the plurality of one-way ball valves 24 or the plurality of one-way ball valves 26 in the pump rod 1 axis direction does not require strict alignment, and can be flexibly arranged in alignment or with a certain offset to adapt to different fluid control requirements.

[0032] Therefore, if one of the one-way ball valves 24 cannot normally close due to wear, that is, one of the one-way ball valves 24 cannot close the channel, the other one-way ball valves 24 can still function to open and close, and the entire sucker rod can still work normally, and the oil in the bypass branch flows uniformly. Similarly, the one-way ball valve 26 can also be provided in multiple, which can also avoid affecting normal oil pumping work after one of them wears out.

[0033] Working principle: the embodiment provides a high-efficiency oil pumping pump structure, which is used,

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

[0035] S2, during the lifting of the pump rod 1, the pump core 6 is lifted, and since the gap between the pump core 6 and the pump cylinder 5 is very small, a low-pressure area is generated below the pump core 6. Thus, the high-pressure oil flow from the formation will pass through the one-way ball valve 26, then enter the peripheral small channel of the shunt device 21, and enter below the pump core 6. When the pump core 6 moves to the top end, the area below the pump core 6 will also be filled with formation liquid. During this process, the one-way ball valve 24 and the traveling one-way valve 7 are in the closed state to prevent the liquid above the pump core 6 from flowing back.

[0036] When the pump core 6 moves to the top, it will be down, the one-way ball valve two 26 is closed, preventing the liquid back to the formation.

[0037] S3, when the pump rod 1 down, push the pump core 6 down, when the pump core 6 below the liquid is extruded to form a high pressure area, when the pressure is higher than the one-way ball valve one 24 and the one-way valve 7 above the pressure, one of the liquid through the one-way ball valve one 24 into the one-way ball valve one 24 above, then into the annulus of the pump barrel 5 and the outer sleeve 4, and then into the inner hole of the tubing seal joint 2, the other liquid through the one-way valve 7 into the pump core 6, continue to flow up and enter the liquid of the tubing seal joint 2, eventually be discharged to the ground, until the pump core 6 reaches the lowest part. In this process, the one-way ball valve one 24 and the one-way valve 7 are open.

[0038] S4, re-enter the above state of the uplink, the one-way valve 7 and the one-way ball valve one 24 are closed during the uplink process, the liquid above the one-way valve is extruded by the volume of the pump core 6, so that the formation liquid is also discharged to the ground during the uplink.

[0039] Through the continuous uplink and downlink 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 tubing and the pump rod 1, realizing continuous oil pumping.

[0040] Further summary and description of the cooperation of each ball valve and the pump core 6:

[0041] The cooperation of the pump core 6 and the one-way valve 7:

[0042] During the uplink, the one-way valve 7 is closed, preventing the liquid above the pump core 6 from flowing back.

[0043] During the downlink, the one-way valve 7 is open, allowing the liquid below the pump core 6 to be extruded into the annulus in the pump core 6.

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

[0045] During the uplink, the one-way ball valve one 24 is closed, preventing 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 one 24.

[0046] During the downlink, the one-way ball valve one 24 is open, allowing the liquid below the pump core 6 to enter the area above the one-way ball valve one 24.

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

[0048] During the uplink, the one-way ball valve two 26 is open, allowing the high pressure oil from the formation to flow into the small channel around the shunt device 21.

[0049] In the downlink, the one-way ball valve 26 is closed to prevent backflow of the liquid into the formation.

[0050] The embodiments of the present application are disclosed as preferable embodiments, but are not limited to the embodiments, and the ordinary skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as the inferences and changes do not deviate from the spirit of the present application, and are within the protection scope of the present application.

Claims

1. A high efficiency oil well pump structure, characterized in that, The utility model provides a pump rod (1), the outer periphery of lower half of pump rod (1) is equipped with oil pipe sealing joint (2), the upper end of oil pipe sealing joint (2) is threaded and is connected with upper oil pipe, the bottom of oil pipe sealing joint (2) is provided with outer sleeve (4), the bottom of outer sleeve (4) is installed with lower connecting body (23), lower connecting body (23) is provided with shunt device (21), the inner periphery of outer sleeve (4) is equipped with pump cylinder (5), pump rod (1) is connected with pump core (6), pump core (6) is equipped with travelling check valve (7), lower connecting body (23) forms an entirety with outer sleeve (4), pump cylinder (5), shunt device (21) and lower connecting body (23) are provided with shunt.

2. The high-efficiency oil well pump structure according to claim 1, wherein The shunt includes a baffle (22) in the shunt device (21) and a ball seat (25) below the shunt device (21), a one-way ball valve (24) is provided between the baffle (22) and the ball seat (25), the lower connecting body (23) has a ball seat (25) inside, and a one-way ball valve (26) is provided between the ball seat (25) and the ball seat (25).

3. The high-efficiency oil well pump structure of claim 1, wherein, The shunt includes a plurality of baffles (22) in the shunt device (21) and a ball seat (25) below each baffle (22), a one-way ball valve (24) is provided between each baffle (22) and the corresponding ball seat (25), and a plurality of ball seats (25) are provided inside the lower connecting body (23), and a one-way ball valve (26) is provided at each of the plurality of ball seats (25).

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

5. The high-efficiency oil well pump structure according to claim 4, wherein The shunt device (21) has a large central hole and a small peripheral hole, and the pump cylinder (5) and the lower connecting body (23) are provided with a connecting formation zone (31), a converging zone (32), a bypass annulus zone (33), and a pump core zone (34), the large central hole is in communication with the bypass annulus zone (33), the small peripheral hole is connected with the one-way ball valve (26) at the bottom, and the small peripheral hole is connected with the pump core (6) at the top.

6. The high-efficiency oil well pump structure according to claim 5, wherein The diameter of the large central hole is greater than that of the small peripheral hole, the number of small peripheral holes is at least one, and the center of the baffle (22) is designed as an inner space.

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