Downhole electric oil pumping pump device

Abstract

The utility model discloses an underground oil pumping electric pump device which comprises a plunger type oil well pump, a pump driving system and a control system, the pump driving system comprises a permanent magnet explosion-proof motor, an end cover assembly and a connecting pipe, a lead screw is connected with an output shaft of the motor through a coupler assembly, and a lead screw nut is arranged on the lead screw. The plunger type oil well pump is provided with a hollow plunger, the hollow plunger is connected with a lead screw nut through a plunger connecting sliding sleeve, the end cover assembly is provided with a wire outlet screw and a leading-out wire, and the leading-out wire is connected with a control cabinet and supplies power to an underground permanent magnet explosion-proof motor through a cable. Through periodical forward and reverse rotation of the motor, the lead screw reciprocates, the plunger of the oil well pump is driven to reciprocate, the purpose of stably, reliably and continuously pumping oil from the deep underground position is achieved, and a driving system is simple in structure, high in anti-pollution capacity and durable.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production equipment, in particular to a reciprocating downhole oil pumping electric pump device. Background Art

[0002] Traditional oil extraction equipment primarily relies on beam pumping units (beam pumping units). These units are mechanically powered devices connected to the pump's column via a sucker rod, which drives the reciprocating plunger, drawing the oil from underground to the surface. However, these units suffer from significant drawbacks, including high energy consumption, low pumping efficiency, skewed wear on the rod and tubing, and high maintenance costs.

[0003] With the development of technology, linear motor drive has become the main method of oil production today. Linear motors convert electrical energy directly into mechanical energy for linear reciprocating motion, simplifying the mechanical transmission process and effectively improving efficiency. The oil production parameters can be adjusted steplessly, providing convenient conditions for achieving automatic control and meeting oil production process requirements. This is a promising new type of pumping unit. It realizes the "rodless oil production" process of tubular plunger pumps, solves the technical difficulty of "tube-rod eccentric wear" of walking beam pumps, extends pump inspection cycles, and saves operating costs.

[0004] When used as a power source, a linear motor must be completely submerged deep underground in oil-rich environments. Due to the varying temperatures in the underground environment, the stator and the air gap between the motor housing and stator generate heat, causing the air in the gap to expand. This can cause deformation and affect the motor's proper operation. Existing linear motors are typically equipped with an air expander, but this is complex and difficult to install.

[0005] The biggest problem with linear motors is their long length. During manufacturing, assembly, and especially use, it is difficult to maintain coaxiality between the mover and stator, affecting normal mechanical movement.

[0006] Furthermore, existing linear motors in deep wells are susceptible to failure due to long-term corrosion from crude oil, reducing oil recovery efficiency. This is primarily due to oil and water entering the motor's air gap, corroding the magnets and causing the stator to lose magnetism. Demagnetization increases the current and eventually causes the motor to stop functioning. Sediment and sand deposits can also clog the air gap, blocking the rotor. Improvements have been made to fill the motor's air gap with lubricating oil to lubricate the rotor and bearings, but this still inevitably causes leakage, impacting operation.

[0007] Therefore, the existing submersible electric pumps used in deep well oil production have defects. Summary of the Invention

[0008] The purpose of the utility model is to solve the above technical problems and provide a novel downhole electric pump device, which can realize simple and efficient oil production, is easy to maintain and has a long service life.

[0009] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is: a downhole oil pump device, including a plunger oil pump, a pump drive system, and a control system. The pump drive system includes a permanent magnet explosion-proof motor, an end cover assembly, and a connecting pipe. The screw is connected to the motor output shaft through a coupling assembly. A screw nut is provided on the screw. A hollow plunger is provided on the plunger oil pump. The hollow plunger is connected to the screw nut through a plunger connecting sleeve. The end cover assembly is provided with an outlet screw and a lead wire. The lead wire is connected to the control cabinet and supplies power to the permanent magnet explosion-proof motor downhole through a cable.

[0010] Preferably, the coupling assembly includes a coupling and a motor connecting sleeve, and the coupling is provided with a plane thrust bearing and a nut.

[0011] Preferably, the screw nut and the plunger connecting sleeve are fastened together by threads.

[0012] Preferably, the plunger connecting sleeve is connected to the connecting pipe via a flange, and a special-shaped sliding connection is adopted between the flange and the plunger connecting sleeve and a sealing member is provided for sealing.

[0013] Preferably, the plunger connecting sleeve is fixedly connected to the hollow plunger via a cap nut.

[0014] Preferably, a threaded hole is provided on the end cover assembly, a wire lead hole is provided at the bottom of the threaded hole, and the lead screw is sealed and fixed on the threaded hole.

[0015] Preferably, the end cover assembly is configured as an end cover and a hard seal combination.

[0016] Preferably, an auxiliary pipe is provided on the connecting pipe, the top of the auxiliary pipe is sealed and fixed on the end cover, an air pressure sensing device is installed in the auxiliary pipe, the air pressure sensing device is connected to the control device, and is used to detect the condition of the underground oil layer.

[0017] Compared with the traditional structure, the beneficial effects of this utility model are:

[0018] 1. The drive system of the utility model has a simple structure. It applies the principle of the reciprocating motion of the screw to the power of the downhole oil pump plunger pump. Through the periodic forward and reverse rotation of the motor, the screw rod reciprocates, driving the reciprocating motion of the oil pump plunger, thereby achieving the purpose of stable, reliable and continuous oil extraction from deep underground.

[0019] 2. The size of the motor used in the present invention is much smaller than that of a linear motor. Its length is only one twentieth of that of a linear motor, making it easier to protect.

[0020] 3. It adopts screw reciprocating transmission, which belongs to mechanical components and mechanical transmission, with simple structure and no electromagnetic change factors. Therefore, the overall stability is more controllable, anti-fouling ability is strong, and it is durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the coupling assembly structure of the utility model;

[0023] Figure 3 for Figure 1 Medium AA view;

[0024] In the figure: 1. Permanent magnet explosion-proof motor, 2. Coupling assembly, 21. Motor connecting sleeve, 22. Nut, 23. Plane thrust bearing, 3. Connecting pipe, 4. Screw, 5. Screw nut, 6. Plunger connecting sleeve, 7. Flange, 8. Sealing ring, 9. Cap nut, 10. Plunger oil pump, 11. Oil suction port, 12. End cover assembly, 13. Hollow plunger, 14. Lead wire, 15. Lead screw. DETAILED DESCRIPTION

[0025] The utility model is further described below.

[0026] Refer to the attached Figure 1-3 A downhole oil pump device includes a plunger oil pump 10, a pump drive system, and a control system. The pump drive system includes a permanent magnet explosion-proof motor 1, an end cover assembly 12, and a connecting pipe 3. The screw rod 4 is connected to the motor output shaft through a coupling assembly 2. A screw nut 5 is provided on the screw rod 4. The plunger oil pump 10 is provided with a hollow plunger 13. The hollow plunger 13 is connected to the screw nut 5 through a plunger connecting sleeve 6. The end cover assembly 12 is provided with an outlet screw 15 and a lead wire 14. The lead wire 14 is connected to the control cabinet on the ground and supplies power to the permanent magnet explosion-proof motor downhole through a cable.

[0027] In this preferred embodiment, the coupling assembly 2 includes a coupling and a motor connecting sleeve 21 , and a planar thrust bearing 23 and a nut 22 are provided on the coupling.

[0028] In this preferred embodiment, the screw nut 5 and the plunger connecting sleeve 6 are fastened together by threads.

[0029] In this preferred embodiment, the plunger connecting sleeve 6 is connected to the connecting pipe 3 through a flange 7. A special-shaped sliding connection is adopted between the flange 7 and the plunger connecting sleeve 6 and a seal 8 is provided for sealing. The special-shaped shape includes an elliptical shape and a polygonal shape.

[0030] In this preferred embodiment, the plunger connecting sleeve 6 and the hollow plunger 13 are fixedly connected via a cap nut 9 .

[0031] In this preferred embodiment, a threaded hole is provided on the end cover assembly 12 , a wire lead hole is provided at the bottom of the threaded hole, and the lead screw 15 is sealed and fixed on the threaded hole.

[0032] In this preferred embodiment, the end cover assembly 12 is configured as a combination of an end cover and a hard seal.

[0033] During specific implementation, the reciprocating frequency of operation is set through the instructions of the artificial control system. After operation, the automatic compensation permanent magnet explosion-proof motor 1 starts to rotate, and the screw 4 rotates synchronously. Since the screw nut 5 is fixed and will not rotate, the plunger connecting sleeve 6 is pushed to move, and the hollow plunger 13 is driven to move synchronously to realize the reciprocating motion of the oil pump plunger. The underground oil is sucked into the oil suction port 11 of the oil pump, and the oil is continuously sent from underground to the ground to complete the oil production purpose.

[0034] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the scope of protection of the present invention. All equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A downhole oil pump device, comprising a plunger oil pump (10), a pump drive system, and a control system, characterized in that: The pump drive system comprises a permanent magnet explosion-proof motor (1), an end cover assembly (12), and a connecting pipe (3); a screw rod (4) is connected to the motor output shaft through a coupling assembly (2); a screw rod nut (5) is provided on the screw rod (4); a hollow plunger (13) is provided on the plunger-type oil well pump (10); the hollow plunger (13) is connected to the screw rod nut (5) through a plunger connecting sleeve (6); an outlet screw (15) and a lead wire (14) are provided on the end cover assembly (12); the lead wire (14) is connected to a control cabinet, and power is supplied to the permanent magnet explosion-proof motor underground through a cable.

2. The downhole electric pump device according to claim 1, characterized in that: The coupling assembly (2) comprises a coupling and a motor connecting sleeve (21); a plane thrust bearing (23) and a nut (22) are provided on the coupling.

3. The downhole electric pump device according to claim 1, characterized in that: The screw nut (5) and the plunger connecting sleeve (6) are fastened together via threads.

4. The downhole electric pump device according to claim 1, characterized in that: The plunger connecting sleeve (6) is connected to the connecting pipe (3) via a flange (7); a special-shaped sliding connection is adopted between the flange (7) and the plunger connecting sleeve (6), and a sealing member (8) is provided for sealing.

5. The downhole electric pump device according to claim 1, characterized in that: The plunger connecting sleeve (6) and the hollow plunger (13) are fixedly connected via a cap nut (9).

6. The downhole electric pump device according to claim 1, characterized in that: The end cover assembly (12) is provided with a threaded hole, the bottom of the threaded hole is provided with a lead-in hole, and the lead-out screw (15) is sealed and fixed on the threaded hole.

7. The downhole electric pump device according to claim 1, characterized in that: The end cover assembly (12) is configured as an end cover and a hard seal combination.

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