Submersible electrically-driven plunger pump transmission device

Abstract

A kind of electric drive plunger pump transmission device of submersible oil.The linear motion rod column, rotary rod column of the present application are arranged in immobile pipe column, linear motion rod column is located above rotary rod column, linear motion rod column is connected with rotary rod column by planetary roller screw pair;The planetary roller screw of rotary rod column and the planetary roller screw nut of linear motion rod column convert the rotary motion of submersible motor into the linear reciprocating motion of plunger;The upper end of immobile pipe column is equipped with sealing assembly.Its beneficial effects are that the structure design is reasonable, planetary roller screw transmission pair is used to connect submersible motor and plunger oil pump together, the rotary motion of submersible motor is changed into the linear motion of plunger oil pump, electric drive plunger pump of submersible oil is formed, with the characteristics of impact resistance, low noise, high precision, stable operation, strong environmental adaptability and low manufacturing cost etc.;The device structure layout is reasonable, and maintenance is simple;Energy loss is less, and transmission efficiency is high.

Description

Technical Field

[0001] This invention relates to a submersible electric-driven plunger pump, and more particularly to a transmission device for a submersible electric-driven plunger pump, belonging to the field of oil and gas development technology. Background Technology

[0002] In rodless oil production equipment for oil and gas development, submersible motor-driven plunger pumps represent a promising direction for oil production. Existing submersible electric plunger pumps consist of a submersible motor, a protector, a transmission device, and the plunger pump itself. The submersible motor is a rotary motor with a rotating output shaft; the plunger pump is a reciprocating pump with a reciprocating linear input shaft. Using a rotary motor to drive a reciprocating plunger pump requires converting the rotary motion of the submersible motor into the linear reciprocating motion of the plunger pump plunger. Within the confined space of the wellbore, achieving this efficient conversion is challenging. Existing transmission devices such as gear racks, ball screws, worm gears, crankshafts, and eccentric wheels / cams suffer from poor impact resistance, high noise levels, unstable operation, and low transmission efficiency, failing to meet the requirements of oil production. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings of existing submersible electric piston pumps that convert rotary motion into linear reciprocating motion, the present invention provides a submersible electric piston pump transmission device.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a submersible electric drive plunger pump transmission device, including a stationary tube column, a rotating rod column, and a linear motion rod column. The linear motion rod column and the rotating rod column are arranged inside the stationary tube column, and the linear motion rod column is located above the rotating rod column. The linear motion rod column and the rotating rod column are connected by a planetary roller screw pair.

[0005] The rotating rod is driven to rotate by the submersible motor below; the upper end of the linear motion rod is connected to the plunger of the plunger pump.

[0006] The planetary roller screw of the rotating rod and the planetary roller screw nut of the linear motion rod convert the rotational motion of the submersible motor into the linear reciprocating motion of the plunger.

[0007] A sealing assembly is installed at the upper end of the stationary tubing string, which seals and isolates the plunger pump chamber from the transmission device chamber.

[0008] The upper end of the connecting shaft of the rotating rod is connected to the planetary roller screw, and the lower end of the connecting shaft is connected to the protector shaft of the protector assembly below the transmission device through a spline sleeve.

[0009] A thrust unit is provided in the middle of the connecting shaft to prevent axial movement of the connecting shaft; a needle roller bearing I is installed on the connecting shaft above the thrust unit, and a needle roller bearing II is installed on the connecting shaft below the thrust unit.

[0010] Furthermore, the thrust-stop unit consists of two sets of thrust cylindrical roller bearings arranged in opposite directions, each set of thrust cylindrical roller bearings including two or more thrust cylindrical roller bearings arranged sequentially in the same direction.

[0011] A centering sleeve is installed on the upper part of the planetary roller screw located inside the guide rod.

[0012] The planetary roller screw nut, guide rod, and plunger of the linear motion lever are connected in sequence from bottom to top.

[0013] Furthermore, the upper and lower ends of the planetary roller screw nut are respectively fixedly installed with an upper anti-collision mechanism and a lower anti-collision mechanism to eliminate the reversing impact.

[0014] An anti-torsion assembly is provided at the guide rod shaft diameter above the upper anti-collision mechanism to prevent the linear motion rod from rotating.

[0015] The upper and lower anti-collision mechanisms are sequentially arranged with a spring seat, a support ring, and an anti-collision ring. The annular spring is located inside the spring seat, and the anti-collision ring slides up and down along the support ring.

[0016] The upper and lower anti-collision mechanisms are installed in opposite directions, with the anti-collision ring of the upper anti-collision mechanism at the upper end and the anti-collision ring of the lower anti-collision mechanism at the lower end.

[0017] Furthermore, the anti-torsion assembly is disposed in the annular space between the guide rod and the stationary column. The anti-torsion assembly includes a bearing support frame, a flat roller bearing, and a pressure plate. The pressure plates at both ends of the bearing support frame are fixedly connected to the stationary column.

[0018] The flat roller bearing is disposed in the groove of the bearing support frame, and the guide rod surface corresponding to the groove of the bearing support frame is flat.

[0019] Furthermore, the oil seal and adjusting ring of the sealing assembly are installed in the sealing joint from bottom to top. The locking nut installed at the upper end of the sealing joint axially fixes the oil seal and adjusting ring, and the adjusting ring corresponds radially to the annular groove of the inner hole of the sealing joint.

[0020] The upper end of the sealing joint is connected to the screen pipe of the plunger oil pump.

[0021] Furthermore, the planetary roller screw nut, guide rod, transition joint, push rod, and plunger of the linear motion rod are fixedly connected in sequence from bottom to top; the sealing assembly is installed on the outer circle of the push rod.

[0022] Furthermore, the stationary tubing column includes, from top to bottom, a sealing joint, connecting sleeve I, a guide joint, connecting sleeve II, a connecting joint, a bearing seat, and a protector joint.

[0023] The bearing housing is equipped with a thrust unit; the connecting joint and the protector joint are respectively equipped with needle roller bearing I and needle roller bearing II; the connecting sleeve II is equipped with a planetary roller screw nut, an upper anti-collision mechanism, and a lower anti-collision mechanism; the guide joint is equipped with an anti-torsion assembly.

[0024] The beneficial effects of this invention are that it has a reasonable structural design, uses a planetary roller screw transmission pair to connect the submersible motor and the plunger pump, converts the rotational motion of the submersible motor into the linear motion of the plunger pump, forming a submersible electric-driven plunger pump, which has the characteristics of impact resistance, low noise, high precision, stable operation, strong environmental adaptability and low manufacturing cost; the device has a reasonable structural layout, simple inspection and maintenance; low energy loss and high transmission efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the submersible electric-driven plunger pump transmission device of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the stop-thrust unit in this invention.

[0027] Figure 3 This is a schematic diagram of the planetary roller screw transmission pair and anti-collision mechanism in this invention.

[0028] Figure 4 This is a schematic diagram of the structure of the first embodiment of the anti-torsion assembly in this invention.

[0029] Figure 5 yes Figure 4 AA sectional view.

[0030] Figure 6 This is a schematic diagram of the structure of the second embodiment of the anti-torsion assembly in this invention.

[0031] Figure 7 yes Figure 6 BB cross-sectional view.

[0032] Figure 8 This is a schematic diagram of the sealing assembly in this invention.

[0033] In the diagram: 1. Plunger, 2. Screen tube, 3. Push rod, 4. Locking nut, 5. Adjusting ring, 6. Oil seal, 7. Sealing joint, 8. Transition joint, 9. Guide rod, 10. Connecting sleeve I, 11. Pressure plate, 12. Flat roller bearing, 13. Bearing support frame, 14. Guide joint, 15. Connecting sleeve II, 16. Anti-collision ring, 17. Support ring, 18. Ring spring, 19. Spring seat, 20. Straightening sleeve, 21. Planetary roller screw, 22. Planetary roller screw nut, 23. Pressure cap, 24. Connecting... 25. Connecting joint, 26. Needle roller bearing I, 27. Thrust cylindrical roller bearing assembly, 28. Bearing housing, 29. Needle roller bearing II, 30. Protector joint, 31. Spline sleeve, 32. Protector shaft, 33. Anti-rotation plate, 34. Retaining ring, 100. Stationary tube column, 200. Rotating rod column, 201. Thrust unit, 300. Linear motion rod column, 301. Upper anti-collision mechanism, 302. Lower anti-collision mechanism, 303. Anti-torsion assembly, 400. Sealing assembly, 500. Planetary roller screw pair. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "seal" should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. A seal can be an oil seal, a packing seal, or other forms of seal. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] See appendix Figure 1-8This invention discloses a transmission device for a submersible electric-driven plunger pump. The submersible motor, protector assembly, transmission device, and plunger pump of the submersible electric-driven plunger pump are connected sequentially from bottom to top. The transmission device includes a stationary tubing string 100, a rotating rod 200, and a linear motion rod 300. The linear motion rod 300 and the rotating rod 200 are disposed within the stationary tubing string 100, with the linear motion rod 300 positioned above the rotating rod 200. The linear motion rod 300 and the rotating rod 200 are connected by a planetary roller screw pair 500. The planetary roller screw pair 500 includes a planetary roller screw 21 and a planetary roller screw nut 22.

[0038] The rotating rod 200 is driven to rotate by a submersible motor. The upper end of the linear motion rod 300 is connected to the plunger 1 of the plunger oil pump. The planetary roller screw 21 of the rotating rod 200 and the planetary roller screw nut 22 of the linear motion rod 300 convert the rotational motion of the submersible motor into the linear reciprocating motion of the plunger 1.

[0039] A sealing assembly 400 is installed at the upper end of the stationary tubing string 100. The sealing assembly 400 seals and isolates the plunger oil pump cavity from the transmission device cavity, preventing well fluid in the plunger oil pump cavity from entering the transmission device.

[0040] The stationary tubing 100 includes, from top to bottom, a sealing joint 7, a connecting sleeve I 10, a guide joint 14, a connecting sleeve II 15, a connecting joint 25, a bearing housing 28, and a protector joint 30. The bearing housing 28 contains a thrust-resistant unit 201; the connecting joint 5 and the protector joint 30 contain needle roller bearing I 6 and needle roller bearing II 29, respectively; the connecting sleeve II 15 contains a planetary roller screw nut 25, an upper anti-collision mechanism 301, and a lower anti-collision mechanism 302; and the guide joint 14 contains an anti-torsion assembly 303.

[0041] The upper end of the connecting shaft 24 of the rotating rod column 200 is connected to the planetary roller screw 21, and the lower end of the connecting shaft 24 is connected to the protector shaft 32 of the protector assembly below the transmission device through the spline sleeve 31; a pressure cap 23 is fixedly installed on the upper end of the connecting shaft 24.

[0042] A thrust unit 201 is provided in the middle of the connecting shaft 24 to prevent axial movement of the connecting shaft 24; a needle roller bearing I 26 is installed on the shaft diameter of the connecting shaft 24 above the thrust unit 201, and a needle roller bearing II 29 is installed on the shaft diameter of the connecting shaft 24 below the thrust unit 201. The needle roller bearings are used to straighten the connecting shaft 24.

[0043] See appendix Figure 2The thrust unit 201 consists of two sets of thrust cylindrical roller bearing assemblies 27 arranged in opposite directions. Each bearing assembly includes two or more thrust cylindrical roller bearings arranged sequentially in the same direction. Preferably, each thrust cylindrical roller bearing assembly 27 includes three thrust cylindrical roller bearings, and the thrust cylindrical roller bearings in each thrust cylindrical roller bearing assembly 27 are arranged sequentially in the same direction. During the operation of the submersible electric piston pump, the upper thrust cylindrical roller bearing assembly is used to eliminate the downward pressure exerted by the push rod 3 on the planetary roller screw 21 during the upper stroke of the piston 1; the lower thrust cylindrical roller bearing assembly is used to eliminate the upward pulling force exerted by the push rod 3 on the planetary roller screw 21 during the lower stroke of the piston 1.

[0044] The planetary roller screw nut 22, guide rod 9, and plunger 1 of the linear motion rod 300 are connected sequentially from bottom to top; preferably, the planetary roller screw nut 22, guide rod 9, transition joint 8, push rod 3, and plunger 1 are fixedly connected sequentially from bottom to top, and the sealing assembly 400 is installed at the shaft diameter of the push rod 3.

[0045] See appendix Figure 3 The anti-collision mechanism includes an upper anti-collision mechanism 301 and a lower anti-collision mechanism 302 with identical structures. The upper anti-collision mechanism 301 and the lower anti-collision mechanism 302 are respectively fixedly installed at the upper and lower ends of the planetary roller screw nut 22. An anti-torsion assembly 303 is provided at the shaft diameter of the guide rod 9 above the upper anti-collision mechanism 301 to prevent the linear motion rod column 300 from rotating.

[0046] Furthermore, the upper anti-collision mechanism 301 and the lower anti-collision mechanism 302 are arranged in sequence with spring seat 19, support ring 17 and anti-collision ring 16. Spring seat 19 is fixedly connected to support ring 17, and ring spring 18 is arranged in spring seat 19. Anti-collision ring 16 slides up and down along support ring 17.

[0047] The upper anti-collision mechanism 301 and the lower anti-collision mechanism 302 are installed in opposite directions. The anti-collision ring 16 of the upper anti-collision mechanism 301 is at the upper end, and the anti-collision ring 16 of the lower anti-collision mechanism 302 is at the lower end.

[0048] The upper anti-collision mechanism 301 and the lower anti-collision mechanism 302 employ spring damping to eliminate the impact of the plunger pump reversal. When the plunger 1 moves upward to the top, it eliminates the impact force between the planetary roller screw 21 and the pressure plate 11 of the anti-torsion assembly 303; when the plunger 1 moves downward to the bottom, it eliminates the impact force between the planetary roller screw 21 and the upper end pressure cap 23 of the rotating rod column 200. Preferably, the planetary roller screw nut 22 is threadedly connected to the upper anti-collision mechanism 301 and the lower anti-collision mechanism 302 and is fixed with radial pins.

[0049] See appendix Figure 4 , 5The anti-torsion assembly 303 is disposed in the annular space between the guide rod 9 and the guide joint 14 of the stationary column 100. While satisfying the linear reciprocating motion of the guide rod 9, it prevents the guide rod from rotating by uniformly distributing radial constraint forces around the circumference of the guide rod 9.

[0050] The anti-torsion assembly 303 includes a bearing support frame 13, a flat roller bearing 12, and a pressure plate 11. The pressure plates 11 at both ends of the bearing support frame 13 are fixedly connected to the connecting sleeve I 10 and the connecting sleeve II 15 of the stationary column 100, respectively, to fix the anti-torsion assembly 303 axially.

[0051] The bearing support frame 13 has a groove in its inner hole, and the flat roller bearing 12 is disposed in the groove. The guide rod 9, corresponding to the groove of the bearing support frame 13, has a flat surface. Preferably, the groove is symmetrically arranged along the axial direction of the bearing support frame 13.

[0052] Furthermore, two or more flat roller bearings 12 are evenly distributed along the circumference of the bearing support frame 13. The optimal number of flat roller bearings 12 is 3-4. While restricting the rotation of the guide rod 9, the rolling friction of the flat roller bearings 12 can reduce the resistance of the guide rod 9 during linear motion.

[0053] Appendix Figure 6 , 7 This is a schematic diagram of the structure of the second embodiment of the anti-torsion assembly 303 in this invention. Three radial grooves are evenly distributed around the inner circumference of the guide joint 14. An anti-rotation plate 33 is axially arranged along the radial grooves. The outer surface of the guide rod 9 corresponding to the anti-rotation plate 33 is flat. Fixing rings 34 are fixedly installed at the upper and lower ends of the guide joint 14, and the anti-rotation plate 33 is axially fixed in the groove by the fixing rings 34. Preferably, the anti-rotation plate 33 and the groove that mates with it are dovetail-shaped; the anti-rotation plate 33 is made of alloy material.

[0054] The upper part of the planetary roller screw 21 of the rotating rod 200 is located inside the guide rod 9, and the shaft diameter of the planetary roller screw 21 is equipped with a straightening sleeve 20 (such as...). Figure 3 (As shown). When the planetary roller screw nut 22 slides to the low position, the planetary roller lever 21 rotates in the annular cavity of the guide rod 9. The swing of the planetary roller lever 21 can be prevented by the straightening sleeve 20.

[0055] See appendix Figure 8The sealing assembly 400 is located at the push rod 3 of the linear motion rod 300. The sealing assembly includes a sealing joint 7, an oil seal 6, an adjusting ring 5, and a locking nut 4. The sealing joint 7 has an annular groove. The locking nut 4, installed at the upper end of the sealing joint 7, axially fixes the oil seal 6 and the adjusting ring 5. The adjusting ring 5 radially corresponds to the annular groove in the inner hole of the sealing joint 7. Preferably, there are two or more oil seals 6 and adjusting rings 5, arranged alternately; for example, oil seal 6, adjusting ring 5, oil seal 6, adjusting ring 5, oil seal 6 are arranged sequentially.

[0056] The planetary roller screw nut 22, guide rod 9, transition joint 8, push rod 3, and plunger 1 of the linear motion rod 300 are fixedly connected from bottom to top; the sealing assembly 400 is installed on the outer circumference of the push rod 3. When the push rod 3 makes linear reciprocating motion, the oil seal 6 and the guide rod 9 provide radial sealing, isolating the plunger oil pump cavity from the transmission device cavity, and isolating the well fluid in the plunger oil pump cavity from the lubricating oil in the transmission device.

[0057] The upper end of the sealing joint 7 is fixedly connected to the screen pipe 2 of the plunger oil pump.

[0058] This invention applies to submersible electric piston pumps. The transmission device of the submersible electric piston pump adopts a planetary roller screw transmission pair. By setting up a thrust unit, anti-collision mechanism, anti-torsion assembly, and sealing assembly, it solves the problem of rotating motor driving piston pumps, converting the rotational driving force into the linear motion of the piston. It has the advantages of impact resistance, low noise, high precision, stable operation and strong environmental adaptability. The transmission device has a reasonable structural layout, simple inspection and maintenance, low energy loss, high transmission efficiency, and low manufacturing cost, and has broad market application prospects.

[0059] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A submersible electric-driven plunger pump transmission device, characterized in that: The system includes a stationary tubing string, a rotating rod string, and a linear motion rod string. The linear motion rod string and the rotating rod string are located inside the stationary tubing string, with the linear motion rod string positioned above the rotating rod string. The linear motion rod string and the rotating rod string are connected via a planetary roller screw pair. The rotating rod string is driven to rotate by a submersible motor below. The upper end of the linear motion rod string is connected to the plunger of the plunger pump. The planetary roller screw of the rotating rod string and the planetary roller screw nut of the linear motion rod string convert the rotational motion of the submersible motor into the linear reciprocating motion of the plunger. A sealing assembly is installed at the upper end of the stationary tubing string, which seals and isolates the plunger pump chamber from the transmission device chamber. The planetary roller screw nut, guide rod, and plunger of the linear motion lever are connected in sequence from bottom to top; The upper and lower ends of the planetary roller screw nut are respectively fixedly installed with an upper anti-collision mechanism and a lower anti-collision mechanism to eliminate the reversing impact; The upper anti-collision mechanism, the lower anti-collision mechanism, the spring seat, the support ring, and the anti-collision ring are arranged in sequence, the annular spring is arranged in the spring seat, and the anti-collision ring slides up and down along the support ring; The upper and lower anti-collision mechanisms are installed in opposite directions, with the anti-collision ring of the upper anti-collision mechanism at the upper end and the anti-collision ring of the lower anti-collision mechanism at the lower end. An anti-torsion assembly is provided at the guide rod shaft diameter above the upper anti-collision mechanism to prevent the linear motion rod column from rotating; The anti-torsion assembly is disposed in the annular space between the guide rod and the stationary column. The anti-torsion assembly includes a bearing support frame, a flat roller bearing, and a pressure plate. The pressure plates at both ends of the bearing support frame are fixedly connected to the stationary column.

2. The submersible electric piston pump transmission device according to claim 1, characterized in that: The upper end of the connecting shaft of the rotating rod column is connected to the planetary roller screw, and the lower end of the connecting shaft is connected to the protector shaft of the protector assembly below the transmission device through a spline sleeve. A thrust unit is provided in the middle of the connecting shaft to prevent axial movement of the connecting shaft; a needle roller bearing I is installed on the connecting shaft above the thrust unit, and a needle roller bearing II is installed on the connecting shaft below the thrust unit.

3. The submersible electric piston pump transmission device according to claim 2, characterized in that: The thrust unit consists of two sets of thrust cylindrical roller bearings arranged in opposite directions, each set including two or more thrust cylindrical roller bearings arranged in the same direction.

4. The submersible electric piston pump transmission device according to claim 3, characterized in that: A centering sleeve is installed on the upper part of the planetary roller screw located inside the guide rod.

5. The submersible electric piston pump transmission device according to claim 1, characterized in that: The flat roller bearing is disposed in the groove of the bearing support frame, and the guide rod surface corresponding to the groove of the bearing support frame is flat.

6. The submersible electric piston pump transmission device according to claim 1, characterized in that: The oil seal and adjusting ring of the sealing assembly are installed in the sealing joint from bottom to top. The locking nut installed at the upper end of the sealing joint axially fixes the oil seal and adjusting ring. The adjusting ring is radially aligned with the annular groove in the inner hole of the sealing joint. The upper end of the sealing joint is connected to the screen pipe of the plunger oil pump.

7. The submersible electric piston pump transmission device according to claim 6, characterized in that: The planetary roller screw nut, guide rod, transition joint, push rod, and plunger of the linear motion rod are fixedly connected in sequence from bottom to top; the sealing assembly is installed on the outer circle of the push rod.

8. The submersible electric piston pump transmission device according to claim 1, characterized in that: The stationary tubing column includes, from top to bottom, a sealing joint, connecting sleeve I, a guide joint, connecting sleeve II, a connecting joint, a bearing seat, and a protector joint; The bearing housing is equipped with a thrust unit; the connecting joint and the protector joint are respectively equipped with needle roller bearing I and needle roller bearing II; the connecting sleeve II is equipped with planetary roller screw nut, upper anti-collision mechanism and lower anti-collision mechanism; the guide joint is equipped with an anti-torsion assembly.

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