High-precision oil pumping unit transmission device for oil exploitation

Abstract

The utility model relates to the technical field of oil exploitation equipment, in particular to a high-precision oil pumping unit transmission device for oil exploitation, which comprises a left supporting seat, a right supporting seat, a speed reducer, a motor and a limit fixing part, an output shaft of the motor is connected with an input shaft of the speed reducer, and a roller is sleeved on the outer surface of the speed reducer. The outer surface of the roller is coaxially sleeved with a winding drum, the winding drum and the roller are in axial sliding connection, an external thread rope groove is formed in the outer surface of the winding drum, an oil pumping steel wire rope is wound in the external thread rope groove, and internal threads matched with external threads of the external thread rope groove are formed in the upper surface of the limiting fixing part. According to an existing method for reducing eccentric wear of a wellhead of a vertical pumping unit, the equipment height and the eccentric wear risk are increased due to the fact that a steel wire rope is replaced with a strong belt, and the strong belt is prone to being affected by wind and needs to be started by additional equipment in an auxiliary mode; and frequent alternating deformation and fatigue damage of the steel wire rope caused by continuous use of the steel wire rope and righting through the fixed pulley are avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, specifically a high-precision pumping unit transmission device for oil extraction. Background Technology

[0002] In oil extraction, vertical pumping units (PPUs) are common equipment used to lift crude oil from downhole to the surface. Traditional PPUs typically use wire ropes to connect sucker rods for retrieval. A motor powers a drum, which in turn rotates the reel. The wire rope, wound around the reel, drives the sucker rod in a reciprocating motion. However, because the reel's axial position is fixed while the wire rope is axially aligned, axial displacement of the wire rope can easily occur, leading to uneven wear at the wellhead. To address this issue, current practices include installing fixed pulleys at the wellhead to align the wire rope or replacing it with a high-strength belt to reduce wellhead wear.

[0003] However, practice has shown that existing methods for reducing wellhead wear in vertical pumping units have the following problems: First, replacing the wire rope with a high-strength belt significantly increases the height of the vertical pumping unit, which in turn increases the possibility of wellhead wear. Furthermore, the high-strength belt is easily affected by wind during operation, further exacerbating the risk of wellhead wear. Second, after replacing the wire rope with a high-strength belt, directly driving the belt via the drum results in insufficient preload. During startup or load changes, the high-strength belt is prone to slippage and cannot be effectively driven. It requires the use of a crane or winch when attaching counterweights, which is not only time-consuming and labor-intensive but also increases costs. In addition, continuing to use wire ropes and using pulleys for alignment still results in frequent alternating deformation of the wire rope in the drum groove, making it highly susceptible to fatigue damage.

[0004] Therefore, it is necessary to invent a high-precision pumping unit transmission device for oil extraction to solve the above problems. Utility Model Content

[0005] This invention addresses the problems of existing methods for reducing wellhead wear in vertical pumping units, such as replacing steel wire ropes with high-strength belts, which increases equipment height and the risk of wear; high-strength belts are susceptible to wind and require additional equipment for starting; and continuing to use steel wire ropes and using pulleys for alignment leads to frequent alternating deformation and fatigue damage. The invention provides a high-precision pumping unit transmission device for oil exploration.

[0006] This utility model is achieved using the following technical solution:

[0007] A high-precision pumping unit transmission device for oil extraction includes a base. A left support and a right support are mounted on the upper surface of the base. A reducer is installed between the left and right support. A motor is mounted on the right support, and the output shaft of the motor is fixedly connected to the input shaft of the reducer. A roller is fitted onto the outer surface of the reducer, and the output shaft of the reducer is connected to the central drive shaft of the roller. A drum is fitted onto the outer surface of the roller. The roller and the drum are coaxially aligned and axially slidably connected. An external threaded rope groove is formed on the outer surface of the drum. A pumping wire rope and a counterweight wire rope are wound within the external threaded rope groove. The upper end of the pumping wire rope is fixed within the external threaded rope groove, and a sucker rod is fixed to the lower end of the pumping wire rope. The lower end of the sucker rod is connected to a pumping pump. The upper end of the counterweight wire rope is fixed within the external threaded rope groove, and a counterweight box is fixed to the lower end of the counterweight wire rope. A limit fixing component is fixed to the upper surface of the base, and the upper surface of the limit fixing component has an internal thread that mates with the external thread of the external threaded rope groove.

[0008] Furthermore, the outer surface of the roller and the inner surface of the drum are axially slidably connected by guide splines.

[0009] Furthermore, the output shaft of the reducer is connected to the central drive shaft of the drum via a brake, and the brake is mounted on the left support. The input shaft of the brake is fixedly connected to the output shaft of the reducer, and the output shaft of the brake is fixedly connected to the central drive shaft of the drum.

[0010] Furthermore, the sucker rod is a flexible sucker rod.

[0011] Furthermore, the oil extraction wire rope is wound in the external threaded groove of a portion of the drum, and the counterweight wire rope is wound in the external threaded groove of another portion of the drum, and the oil extraction wire rope and the counterweight wire rope do not overlap.

[0012] Furthermore, the limiting and fixing member is located on the side where the oil extraction wire rope leaves the drum, and the limiting and fixing member is threaded into the external threaded groove of the portion of the rope that is not wound with the oil extraction wire rope and the counterweight wire rope.

[0013] Furthermore, the output shaft of the motor, the input shaft of the reducer, the output shaft of the reducer, the input shaft of the brake, the output shaft of the brake, and the central drive shaft of the drum are all arranged along the same central axis.

[0014] This utility model features a reasonable and reliable structural design, providing precise axial displacement compensation. The drum and roller are connected by an external threaded rope groove and a threaded fixing component, enabling axial displacement of the drum under rotational drive. This ensures that the wire rope always moves along a fixed axis during winding, preventing uneven wear at the wellhead and reducing wear and alternating deformation of the pumping wire rope, significantly extending its service life. It eliminates the need for additional fixed pulleys or belts, reducing environmental interference risks and start-up costs. Furthermore, it features high-precision and compact transmission, with the motor, reducer, brake, and roller arranged on the same axis, reducing vibration and energy loss and improving transmission accuracy. In addition, it has dual braking safety redundancy, with the motor's built-in brake and an independent brake working together to ensure precise and reliable braking response. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model in use.

[0017] Figure 3 This is a schematic diagram of the sucker rod reaching the bottom dead center A position when the present invention is in use, and a cross-sectional schematic diagram of the sucker wire rope at this time.

[0018] Figure 4 This is a schematic diagram of the sucker rod reaching the midpoint A position when the present invention is in use, and a cross-sectional schematic diagram of the sucker wire rope at this time.

[0019] Figure 5 This is a schematic diagram of the sucker rod reaching the top dead center A position when the present invention is in use, and a cross-sectional schematic diagram of the sucker wire rope at this time.

[0020] Figure 6 This is a schematic diagram showing the position of the sucker rod when it reaches the corresponding top dead point B, mid point B, and bottom dead point B during the operation of an existing vertical pumping unit, as well as a cross-sectional schematic diagram of the sucker wire rope corresponding to these three states.

[0021] In the diagram: 1. Base; 2. Left support seat; 3. Right support seat; 4. Reducer; 5. Motor; 6. Drum; 7. Reel; 8. External threaded rope groove; 9. Pumping wire rope; 10. Counterweight wire rope; 11. Sucker rod; 12. Counterweight box; 13. Limiting fastener; 14. Guide spline; 15. Brake; 16. Wellhead sealer; 17. Tower; 18. Top dead center A; 19. Midpoint A; 20. Bottom dead center A; 21. Existing vertical pumping unit; 22. Existing vertical pumping unit's pumping wire rope; 23. Existing vertical pumping unit's sucker rod; 24. Top dead center B; 25. Midpoint B; 26. Bottom dead center B. Detailed Implementation

[0022] A high-precision pumping unit transmission device is used in oil extraction, as shown in the attached... Figure 1 ~Appendix Figure 2 As shown, the system includes a base 1, with a left support 2 and a right support 3 on its upper surface. A reducer 4 is mounted between the left support 2 and the right support 3. A motor 5 is mounted on the right support 3, and the output shaft of the motor 5 is fixedly connected to the input shaft of the reducer 4. A roller 6 is fitted onto the outer surface of the reducer 4, and the output shaft of the reducer 4 is connected to the central drive shaft of the roller 6. A drum 7 is fitted onto the outer surface of the roller 6. The roller 6 and the drum 7 are arranged on the same central axis, and the drum 7 and the roller 6 are axially slidably connected. The outer surface of the drum 7... The surface is provided with an external threaded rope groove 8, and an oil extraction wire rope 9 and a counterweight wire rope 10 are wound in the external threaded rope groove 8. The upper end of the oil extraction wire rope 9 is fixed in the external threaded rope groove 8, and the lower end of the oil extraction wire rope 9 is fixed with an oil extraction rod 11. The lower end of the oil extraction rod 11 is connected to an oil pump. The upper end of the counterweight wire rope 10 is fixed in the external threaded rope groove 8, and the lower end of the counterweight wire rope 10 is fixed with a counterweight box 12. The upper surface of the base 1 is fixed with a limit fastener 13, and the upper surface of the limit fastener 13 is provided with an internal thread that matches the external thread of the external threaded rope groove 8.

[0023] The outer surface of the roller 6 and the inner surface of the drum 7 are axially slidably connected by guide splines 14.

[0024] The oil extraction wire rope 9 is wound in the external threaded groove 8 of a part of the drum 7, and the counterweight wire rope 10 is wound in the external threaded groove 8 of another part of the drum 7, and the oil extraction wire rope 9 and the counterweight wire rope 10 do not overlap.

[0025] The limiting and fixing member 13 is located on the side of the oil extraction wire rope 9 that is away from the drum 7, and the limiting and fixing member 13 is threadedly engaged with the external threaded groove 8 of the part of the rope that is not wound with the oil extraction wire rope 9 and the counterweight wire rope 10.

[0026] In this utility model, the base 1 serves as the mounting foundation for the entire device. The left support 2 and right support 3 support the reducer 4, ensuring stable operation of the transmission system. The motor 5 drives the drum 6 to rotate by reducing its speed and increasing its torque through the reducer 4. The drum 6 drives the drum 7 to rotate synchronously through the guide spline 14. Due to the stable power output provided by the reducer 4, and in conjunction with the linkage design of the drum 6 and the drum 7, precise lifting and lowering of the oil extraction wire rope 9 and the counterweight wire rope 10 are achieved. The outer surface of the drum 7 has a continuous external threaded rope groove 8. The oil extraction wire rope 9 and the counterweight wire rope 10 are wound around different parts of the external threaded rope groove 8 without overlapping, avoiding mutual interference and ensuring load balance. The limiting and fixing component 13 is connected to the control mechanism. The internal thread of the drum 7 engages with the external thread groove 8 of the part not containing the sucker wire rope 9 and the counterweight wire rope 10. This not only avoids motion interference, but also allows the drum 7 to move axially while rotating due to the thread constraint of the limiting and fixing part 13. This keeps the position of the sucker wire rope 9 fixed when it is disengaged from the external thread groove 8, avoiding wellhead wear caused by axial displacement. This avoids the problems of increasing equipment height and wear risk caused by replacing the wire rope with a high-strength belt, as well as the time-consuming, labor-intensive, and costly problems caused by the high-strength belt being susceptible to wind and requiring additional equipment for startup. At the same time, the sucker wire rope 9 does not need to undergo frequent alternating deformation, thus reducing the possibility of fatigue damage.

[0027] The output shaft of the reducer 4 is connected to the central drive shaft of the drum 6 via a brake 15, and the brake 15 is mounted on the left support 2. The input shaft of the brake 15 is fixedly connected to the output shaft of the reducer 4, and the output shaft of the brake 15 is fixedly connected to the central drive shaft of the drum 6.

[0028] The input shaft of the reducer 4 is fixed to the output shaft of the motor 5, and the output shaft of the reducer 4 is fixed to the input shaft of the brake 15. This dual braking design allows for rapid response and braking control in emergency situations through the braking system of the motor 5 itself, and also allows for auxiliary braking through the brake 15. Even if one brake fails, the other can still ensure the transmission safety of the device, significantly reducing the risk of failure. It is an efficient, safe and flexible design.

[0029] The output shaft of the motor 5, the input shaft of the reducer 4, the output shaft of the reducer 4, the input shaft of the brake 15, the output shaft of the brake 15, and the central drive shaft of the drum 6 are all arranged along the same central axis.

[0030] The design that the output shaft of the motor 5, the input shaft of the reducer 4, the output shaft of the reducer 4, the input shaft of the brake 15, the output shaft of the brake 15, and the central drive shaft of the drum 6 are all arranged along the same central axis not only makes the device compact and space-efficient, but also enables high-precision transmission, reduces vibration and energy loss, and effectively enhances system stability and reliability.

[0031] The sucker rod 11 is a flexible sucker rod.

[0032] Flexible sucker rods can adapt to wellhead fine-tuning, further reducing the risk of uneven wear.

[0033] During installation, as shown in the attached document Figure 1 ~Appendix Figure 2 As shown, firstly, a tower 17 is erected next to the wellhead. This device is installed on the top of the tower 17. A sucker wire rope 9 is wound along the external threaded groove 8 from one end of the drum 7, and the upper end of the sucker wire rope 9 is fixed inside the external threaded groove 8. A counterweight wire rope 10 is wound along the external threaded groove 8 from the other end of the drum 7, and the upper end of the counterweight wire rope 10 is fixed inside the external threaded groove 8, ensuring that the sucker wire rope 9 and the counterweight wire rope 10 do not overlap. A sucker rod 11 is fixed to the lower end of the sucker wire rope 9, and oil is pumped. The lower end of rod 11 is inserted into wellhead sealer 16, and the lower end of sucker rod 11 is connected to oil pump. The oil pump is located in oil well. The lower end of counterweight wire rope 10 is fixed to counterweight box 12. Check that the limiting fastener 13 is located on the side of sucker wire rope 9 away from drum 7, and that the limiting fastener 13 is threadedly engaged with the external threaded groove 8 of the part of the external threaded rope groove 8 that is not wound with sucker wire rope 9 and counterweight wire rope 10. Ensure that the sucker wire rope 9 connected to sucker rod 11 falls vertically and that sucker rod 11 is inserted directly into the wellhead.

[0034] In operation, the motor 5 is first started to output power. Then, the power is reduced in speed and increased in torque by the reducer 4 to drive the drum 6 to rotate. The drum 6 drives the drum 7 to rotate synchronously through the guide spline 14. At the same time, the drum 7 generates axial displacement due to the engagement of the external threaded rope groove 8 with the internal thread of the limiting and fixing part 13. Due to the engagement of the internal thread of the limiting and fixing part 13 with the external threaded rope groove 8 of the drum 7, the drum 7 moves axially by one pitch every time it rotates. This movement compensates for the axial offset when the sucker wire rope 9 is wound, ensuring that the position of the sucker wire rope 9 detached from the drum 7 is always fixed, avoiding uneven wear at the wellhead. The rotation and displacement of the drum 7 drive the sucker rod 11 to perform a cyclical motion of rising and falling, thereby completing the oil extraction. After the oil extraction is completed, the motor 5 is stopped.

[0035] When the drum 7 rotates clockwise and moves along the positive axis of the drum 7, the sucker rod 11 descends, the sucker wire rope 9 is aligned with the wellhead and falls vertically to be released, and the counterweight wire rope 10 drives the counterweight box 12 to rise.

[0036] As attached Figure 3 As shown, the bottom dead center A20 of the sucker rod 11 is the lowest position that the tip of the sucker rod 11 can reach during its downward stroke. At this point, the sucker rod 11 begins to change from downward movement to upward movement. At this time, the cross-sectional shape of the sucker wire rope 9 in the external threaded rope groove 8 is a regular ellipse.

[0037] When drum 7 rotates counterclockwise and moves along the opposite axis of drum 7, the sucker wire rope 9 drives the sucker rod 11 to rise vertically, and the counterweight box 12 drives the counterweight wire rope 10 to descend. (See attached...) Figure 5 As shown, the top dead center A18 of the sucker rod 11 is the highest position that the tip of the sucker rod 11 can reach during its upward stroke. At this point, the sucker rod 11 begins to change from upward movement to downward movement. At this time, the cross-sectional shape of the sucker wire rope 9 in the external threaded rope groove 8 is a regular ellipse.

[0038] As attached Figure 4 As shown, the midpoint A19 of the sucker rod 11 is the midpoint between the upper dead point A18 and the lower dead point A20 of the sucker rod 11. At this time, the cross-sectional shape of the sucker wire rope 9 in the external threaded rope groove 8 is a regular ellipse.

[0039] As attached Figure 3 ~Appendix Figure 5 As shown, the sucker rod 11 ascends from the bottom dead center A20 to the midpoint A19 and then to the top dead center A18. This is the ascending process of the sucker rod 11. The sucker rod 11 descends from the top dead center A18 to the midpoint A19 and then to the bottom dead center A20. This completes one cycle of oil extraction. During this cycle, the cross-sectional shape of the sucker wire rope 9 in the external threaded rope groove 8 remains unchanged and is a regular ellipse. This prevents wear and alternating stress. At the same time, the sucker rod 11 does not form an angle with the wellhead, thus preventing uneven wear and extending the service life of the sucker wire rope 9.

[0040] In practice, when the motor 5 starts, the brake 15 is in a non-braking state; when the motor 5 stops, the brake 15 is in a braking state.

[0041] As attached Figure 6As shown, in the existing vertical pumping unit 21, the highest position that the tip of the sucker rod 23 can reach during the upward stroke is the top dead center B24, and the lowest position that the tip of the sucker rod 23 can reach during the downward stroke is the bottom dead center B26. The midpoint B25 between the top dead center B24 and the bottom dead center B26 is also present. During the oil circulation process, the sucker rod 23 of the existing vertical pumping unit 21... Fixed placement prevents axial displacement. The cross-sectional shape of the existing vertical pumping unit's wire rope 22 varies greatly within its rope groove. Furthermore, the contact area and contact position between the existing vertical pumping unit's wire rope 22 and its corresponding rope groove also vary greatly, constantly changing between three states: left-handed elliptical, right-handed elliptical, and right-handed elliptical. This makes the existing vertical pumping unit's wire rope 22 prone to wear and alternating stress, affecting its lifespan. At the same time, the existing vertical pumping unit's sucker rod 23 will form an angle with the wellhead, which will easily lead to uneven wear.

[0042] By comparing with the existing vertical pumping unit 21, this device effectively overcomes the problems of replacing the wire rope with a high-strength belt to reduce wellhead wear of existing vertical pumping units, which increases the equipment height and the risk of wear. The high-strength belt is easily affected by wind and requires additional equipment to start. Furthermore, continuing to use the wire rope and using a fixed pulley for straightening will lead to frequent alternating deformation and fatigue damage of the wire rope. This device achieves highly reliable and long-life pumping operations.

[0043] In practice, when the motor 5 starts, the brake 15 is in a non-braking state; when the motor 5 stops, the brake 15 is in a braking state.

[0044] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision drive unit for a pumping unit for oil production, characterized in that: The base (1) is provided with a left support seat (2) and a right support seat (3) on the upper surface, a speed reducer (4) is installed between the left support seat (2) and the right support seat (3), a motor (5) is installed on the right support seat (3), the output shaft of the motor (5) is fixedly connected with the input shaft of the speed reducer (4), the outer surface of the speed reducer (4) is sleeved with a roller (6), the output shaft of the speed reducer (4) is connected with the central driving shaft of the roller (6), the outer surface of the roller (6) is sleeved with a winding drum (7), the roller (6) and the winding drum (7) are coaxially arranged, the winding drum (7) is axially slidably connected with the roller (6), the outer surface of the winding drum (7) is provided with an external thread rope groove (8), an oil pumping steel wire rope (9) and a counterweight steel wire rope (10) are wound in the external thread rope groove (8), the upper end of the oil pumping steel wire rope (9) is fixed in the external thread rope groove (8), the lower end of the oil pumping steel wire rope (9) is fixed with an oil pumping rod (11), the lower end of the oil pumping rod (11) is connected with an oil pumping pump, the upper end of the counterweight steel wire rope (10) is fixed in the external thread rope groove (8), the lower end of the counterweight steel wire rope (10) is fixed with a counterweight box (12), the upper surface of the base (1) is fixed with a limiting fixing part (13), the upper surface of the limiting fixing part (13) is provided with an internal thread matched with the external thread of the external thread rope groove (8).

2. A high-precision pumping unit drive for oil production according to claim 1, characterized in that: The outer surface of the roller (6) and the inner surface of the winding drum (7) are axially slidably connected through a guide spline (14).

3. A high precision pumping unit drive for oil production as defined in claim 1, characterized in that: The output shaft of the speed reducer (4) and the central driving shaft of the roller (6) are connected through a brake (15), the brake (15) is installed on the left support seat (2), the input shaft of the brake (15) is fixedly connected with the output shaft of the speed reducer (4), and the output shaft of the brake (15) is fixedly connected with the central driving shaft of the roller (6).

4. A high precision pumping unit drive for oil production according to claim 1, characterized in that: The oil pumping rod (11) is a flexible oil pumping rod.

5. A high precision pumping unit drive for oil production as defined in claim 1, characterized in that: The oil pumping steel wire rope (9) is wound in the external thread rope groove (8) of one part of the winding drum (7), the counterweight steel wire rope (10) is wound in the external thread rope groove (8) of another part of the winding drum (7), and the oil pumping steel wire rope (9) and the counterweight steel wire rope (10) are not overlapped.

6. A high precision pumping unit drive for oil production as defined in claim 1, characterized in that: The limiting fixing part (13) is located on the side where the oil pumping steel wire rope (9) leaves the winding drum (7), and the limiting fixing part (13) is threadedly matched with the part of the external thread rope groove (8) where the oil pumping steel wire rope (9) and the counterweight steel wire rope (10) are not wound.

7. A high precision pumping unit drive for oil production according to claim 3, characterized in that: The output shaft of the motor (5), the input shaft of the speed reducer (4), the output shaft of the speed reducer (4), the input shaft of the brake (15), the output shaft of the brake (15), and the central driving shaft of the roller (6) are coaxially arranged.

Images