Flexible rod super long stroke pumping unit

Abstract

This invention discloses a flexible rod ultra-long stroke pumping unit, belonging to the technical field of pumping units. The flexible rod ultra-long stroke pumping unit includes a support frame, with an upper platform assembly at the top of the support frame. A cage ladder is fixedly connected to the outer side of the support frame. A drive device is located at the top of the upper platform assembly, and the drive device is connected to a flexible rod. A sucker plug is connected to the end of the flexible rod. A centering wheel assembly is located on the side of the support frame away from the cage ladder, through which the flexible rod passes. The drive device is also connected to a counterweight balancing mechanism. The flexible rod ultra-long stroke pumping unit achieves the reciprocating motion of the sucker rod by winding and releasing the flexible rod on a drum. Compared with various newly developed beamless pumping units on the market, it features a simple structure, small footprint, an ultra-long stroke of 18 meters, low stroke rate, and convenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of oil pumping unit technology, and in particular to a flexible rod ultra-long stroke oil pumping unit. Background Technology

[0002] Currently, pumping units are widely used in oilfield development as a key downhole oil production device. Traditional pumping units are mainly beam pumping units, which have been used for a long time due to their mature design and reliable operation. However, with the increasing demand for deep wells, high-production oil wells, and operations under special geological conditions, traditional beam pumping units have gradually revealed some limitations: the stroke length of beam pumping units is usually limited by the mechanical structure, generally not exceeding 10 meters, which is insufficient for deep wells and high-production oil wells. Insufficient stroke length limits the amount of fluid lifted per unit time, thus affecting the oil well's production efficiency. The structure of beam pumping units is relatively complex, including walking beams, counterweights, and long linkage mechanisms, requiring a large footprint. In oilfield intensive operations and space-constrained conditions, equipment layout is difficult, affecting resource utilization. During operation, traditional beam pumping units experience significant friction between mechanical components, resulting in low operating efficiency. Furthermore, due to their complex transmission structure, energy consumption is high, which is detrimental to the oilfield's energy conservation and emission reduction goals. Beam pumping units are prone to wear and failure due to their numerous components and complex mechanical structure. Their maintenance is complex and costly, impacting oilfield production efficiency and equipment economy.

[0003] To address the aforementioned issues, beamless pumping units have gradually become a hot research topic in the industry. These pumping units simplify the structure and reduce the footprint by eliminating the traditional walking beam mechanism and employing methods such as cable-driven or hydraulically driven systems. However, beamless pumping units currently on the market still have the following shortcomings:

[0004] While beamless pumping units have overcome the stroke limitations of traditional beam pumping units to some extent, the stroke length of existing equipment still cannot meet the requirements of ultra-long strokes of 18 meters and above, especially in deep well extraction. Some beamless pumping units still have safety hazards in the design of key components; for example, they cannot achieve rapid braking in the event of motor stoppage or sudden power failure, posing a risk of equipment damage or safety accidents. Due to technological limitations, some beamless pumping units exhibit poor stability under high loads or prolonged operation, and are prone to equipment vibration and performance degradation. Summary of the Invention

[0005] Current oil pumping unit technology, whether traditional beam pumping or the new beamless pumping, still faces certain technical bottlenecks and room for improvement. Therefore, there is an urgent need for a new type of oil pumping unit that is simple in structure, occupies a small area, achieves ultra-long strokes, low stroke rates, reliable operation, and high safety performance to meet the actual needs of oilfield development.

[0006] The purpose of this invention is to provide a flexible rod ultra-long stroke pumping unit, which achieves the reciprocating motion of the sucker rod by winding and releasing a flexible rod on a drum. Compared with various newly developed beamless pumping units on the market, it has the advantages of simple structure, small footprint, 18-meter ultra-long stroke, low stroke rate, and convenient maintenance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A flexible rod ultra-long stroke pumping unit includes a support frame, an upper platform assembly at the top of the support frame, a cage ladder fixedly connected to the outside of the support frame, a drive device at the top of the upper platform assembly, a flexible rod connected to the drive device, an oil pump plug connected to the end of the flexible rod, a centering wheel assembly at the side of the support frame away from the cage ladder, the flexible rod passing through the centering wheel assembly, and a counterweight balancing mechanism connected to the drive device.

[0009] Preferably, the upper platform assembly includes a working platform, which is fixedly installed on the top of the support frame, and a guardrail is fixedly connected to the top of the working platform.

[0010] Preferably, the driving device includes a support platform and a motor. The support platform is fixedly installed above the working platform, and the motor is installed above the support platform. A drive wheel is fixedly installed at the output end of the motor. A support rod is also installed above the working platform. The support rod is located below the support platform. A rotating roller is rotatably connected to the middle of the support rod. A driven wheel is coaxially connected to the rotating roller. The driven wheel and the drive wheel are connected by a synchronous toothed belt drive.

[0011] Preferably, the rotating roller is divided into two areas, namely a working area and a balancing area. There are two balancing areas, located on both sides of the working area. The flexible rod is wound around the outside of the rotating roller, and a pull rope is wound around the outside of the working area.

[0012] The flexible rod and the pull rope are wound in opposite directions.

[0013] Preferably, the counterweight balancing mechanism includes a counterweight box located inside the support frame. The top of the counterweight box is connected to a pull rope. A rotating shaft is also fixedly connected to the inner wall of the top of the support frame. A rotatable guide wheel is sleeved on the outer side of the rotating shaft, and the guide wheel guides the pull rope.

[0014] Preferably, the rotating roller is also coaxially connected to an emergency braking mechanism, the emergency braking mechanism including an inner disc and an outer disc, a brake ring is provided between the inner disc and the outer disc, the brake ring is fixedly connected to the inner wall of the outer disc, and the brake ring does not contact the inner disc;

[0015] A central column is provided in the middle of the inner plate. Several movable slots are symmetrically distributed around the center of the central column inside the inner plate. A spring is provided inside the movable slot. One end of the spring is fixedly connected to the central column, and the other end of the spring is fixedly connected to a brake pad.

[0016] Preferably, the inner edge of the inner disk has a telescopic groove that intersects the path and the moving groove. A movable baffle is provided inside the telescopic groove. One end of the baffle is fixedly connected to an elastic rope, and the other end of the elastic rope is fixedly connected to the inner wall of the telescopic groove. An electromagnet is provided at the other end of the telescopic groove near the baffle. When the electromagnet is energized, the baffle is attracted by the electromagnet.

[0017] The length of the portion of the telescopic groove that is cut off by the moving groove and is farther from the electromagnet is greater than the length of the baffle.

[0018] Preferably, the outer surface of the brake pad is provided with several protrusions, and the inner surface of the brake ring is provided with several concave points corresponding to the protrusions.

[0019] Preferably, the straightening wheel assembly includes a connecting rod, a connector, and a pull rod. A rotatable straightening wheel is provided in the middle of the connector. The connector is fixedly connected to the outside of the support frame through the connecting rod and the pull rod. A U-shaped protective member is provided on one side of the connector from the connecting rod. The flexible rod passes through the space between the straightening wheel and the U-shaped protective member.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) In this invention, a flexible rod is set as the sucker rod. When the motor reciprocates, the flexible rod is repeatedly wound and released, driving the sucker plug to rise or fall. Since the flexible rod can be set to a longer length, its stroke is greatly increased compared to the traditional pumping unit, and the corresponding number of strokes is greatly reduced to 1 / 3 of that of the conventional pumping unit. The service life of the valve ball and valve seat is greatly improved. After the number of strokes is significantly reduced, the load alternation of the sucker rod is greatly reduced, which can effectively extend the fatigue life of the sucker rod. The ultra-long stroke and significantly reduced number of strokes can work more efficiently with non-metallic sucker rods. The reversing flexibility is controllable, which can improve the well fluid pumping conditions and improve pump efficiency. The ultra-long stroke and low number of strokes can effectively reduce pipe and rod wear.

[0022] (2) The present invention is equipped with an emergency braking mechanism. When the flexible rod breaks or other sudden situations cause the rotational speed of the rotating roller to run out of control, the electromagnet receives a signal and automatically cuts off the power. The baffle is retracted into the telescopic groove under the action of the elastic rope, and the brake pad contacts the brake ring, which can reduce the speed of the rotating roller. When the equipment suddenly loses power, the electromagnet will still lose its function, and the motor will disengage from the control of the rotating roller. The emergency braking mechanism can still control the rotational speed of the rotating roller. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a flexible rod ultra-long stroke pumping unit proposed in this invention;

[0024] Figure 2 This is another schematic diagram of a flexible rod ultra-long stroke pumping unit proposed in this invention;

[0025] Figure 3 This is a schematic diagram of the drive device structure of a flexible rod ultra-long stroke pumping unit proposed in this invention;

[0026] Figure 4 This is a schematic diagram of the centralizing wheel assembly structure of a flexible rod ultra-long stroke pumping unit proposed in this invention;

[0027] Figure 5 This is a schematic diagram of an emergency braking mechanism for a flexible rod ultra-long stroke pumping unit proposed in this invention;

[0028] Figure 6 This is a cross-sectional view of an emergency braking mechanism for a flexible rod ultra-long stroke pumping unit proposed in this invention.

[0029] In the diagram: 1. Support frame; 2. Upper platform assembly; 201. Working platform; 202. Guardrail; 3. Drive unit; 301. Electric motor; 302. Drive wheel; 303. Synchronous toothed belt; 304. Support rod; 305. Rotating roller; 306. Working area; 307. Balance area; 308. Driven wheel; 309. Support platform; 4. Flexible rod; 5. Oil sucker plug; 6. Centering wheel assembly; 601. Connecting rod; 602. Connector; 603. 604. Pull rod; 605. Centering wheel; 606. U-shaped protective component; 7. Counterweight balancing mechanism; 701. Rotating shaft; 702. Guide wheel; 703. Pull rope; 704. Counterweight box; 8. Cage ladder; 9. Emergency braking mechanism; 901. Inner disc; 902. Central column; 903. Moving groove; 904. Spring; 905. Brake pad; 906. Electromagnet; 907. Telescopic groove; 908. Baffle; 909. Elastic rope; 10. Outer disc; 11. Brake ring. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Reference Figure 1 - Figure 6 A flexible rod ultra-long stroke oil pumping unit includes a support frame 1, an upper platform assembly 2 on the top of the support frame 1, a cage ladder 8 fixedly connected to the outside of the support frame 1, the cage ladder 8 facilitating the up-and-down movement of personnel to control the control box and maintain the equipment, a drive device 3 on the top of the upper platform assembly 2, the drive device 3 providing power to the entire equipment, a flexible rod 4 connected to the drive device 3, the flexible rod 4 being made of flexible material and capable of being wound, an oil pump plug 5 connected to the end of the flexible rod 4, a straightening wheel assembly 6 on the side of the support frame 1 away from the cage ladder 8, the flexible rod 4 passing through the straightening wheel assembly 6, the straightening wheel assembly 6 ensuring that the working section of the flexible rod 4 is in a vertical state for convenient oil pumping, the drive device 3 is also connected to a counterweight balancing mechanism 7, the counterweight balancing mechanism 7 ensuring that the device is in a state of gravity balance when the oil pump plug 5 moves up and down, preventing the equipment from tipping over.

[0032] The upper platform assembly 2 includes a work platform 201, which is fixedly installed on the top of the support frame 1, and a guardrail 202 is fixedly connected to the top of the work platform 201.

[0033] The drive unit 3 includes a support platform 309 and a motor 301. The motor 301 provides power to the entire unit. The support platform 309 is fixedly installed above the working platform 201. The motor 301 is installed above the support platform 309, and a drive wheel 302 is fixedly installed at the output end of the motor 301. A support rod 304 is also installed above the working platform 201, located below the support platform 309. A rotating roller 305 is rotatably connected to the middle of the support rod 304. A driven wheel 308 is coaxially connected to the rotating roller 305. The driven wheel 308 and the drive wheel 302 are connected by a synchronous toothed belt 303. When the motor 301 starts, it drives the drive wheel 302 to rotate. The rotation of the drive wheel 302 drives the driven wheel 308 to rotate through the synchronous toothed belt 303, which in turn drives the rotating roller 305 to rotate.

[0034] The rotating roller 305 is divided into two areas: the working area 306 and the balancing area 307. The working area 306 drives the flexible rod 4 to wind or release, and the balancing area 307 drives the counterweight box 704 to rise and fall. There are two balancing areas 307, located on both sides of the working area 306. The flexible rod 4 is wound around the outside of the rotating roller 305, and the pull rope 703 is wound around the outside of the working area 306.

[0035] The flexible rod 4 and the pull rope 703 are wound in opposite directions, ensuring that only one of the flexible rod 4 and the pull rope 703 is wound or released at the same time, and only one of the counterweight box 704 and the oil pump plug 5 is raised or lowered at the same time, ensuring the overall center of gravity of the equipment is balanced.

[0036] The counterweight balancing mechanism 7 includes a counterweight box 704. The counterweight box 704 has a relatively heavy weight and provides pressure to maintain the balance of the equipment. The counterweight box 704 is located inside the support frame 1. The top of the counterweight box 704 is connected to the pull rope 703. A rotating shaft 701 is also fixedly connected to the inner wall of the top of the support frame 1. A rotatable guide wheel 702 is sleeved on the outer side of the rotating shaft 701. The guide wheel 702 guides the pull rope 703.

[0037] Working principle: When in use, the operator starts the motor 301, which drives the flexible rod 4 to repeatedly wind and release, causing the oil pump plug 5 to rise or fall. At the same time, the pull rope 703 is repeatedly released and wound, and the counterweight box 704 rises or falls to provide balance for the equipment. During the process of the oil pump plug 5 rising and falling, the oil underground will be extracted, thereby achieving the purpose of oil extraction.

[0038] When the motor 301 reciprocates, the flexible rod 4 repeatedly winds and releases, driving the sucker plug 5 to rise or fall. Because the flexible rod 4 can be set to a longer length, its stroke is greatly increased compared to traditional pumping units, and the corresponding number of strokes is greatly reduced to 1 / 3 of that of conventional pumping units. The service life of the valve ball and valve seat is greatly improved. After the number of strokes is significantly reduced, the load alternation of the sucker rod is greatly reduced, which can effectively extend the fatigue life of the sucker rod. The ultra-long stroke and significantly reduced number of strokes can work more efficiently with non-metallic sucker rods. The reversing flexibility is controllable, which can improve the well fluid pumping conditions and improve pump efficiency. The ultra-long stroke and low number of strokes can effectively reduce tubing wear.

[0039] The rotating roller 305 is also coaxially connected to an emergency braking mechanism 9. The emergency braking mechanism 9 includes an inner disk 901 and an outer disk 10. The inner disk 901 is fixedly connected to the rotating roller 305, and the outer disk 10 is fixedly connected to the support platform 309. The inner disk 901 rotates together with the rotating roller 305, while the outer disk 10 remains fixed. A brake ring 11 is provided between the inner disk 901 and the outer disk 10. The inner wall of the brake ring 11 is rough, and the brake ring 11 is fixedly connected to the inner wall of the outer disk 10. The brake ring 11 does not contact the inner disk 901.

[0040] A central column 902 is provided in the middle of the inner disk 901. Several moving grooves 903 are symmetrically distributed around the center of the central column 902 inside the inner disk 901. A spring 904 is provided inside the moving groove 903. One end of the spring 904 is fixedly connected to the central column 902, and the other end of the spring 904 is fixedly connected to a brake pad 905. When the rotating roller 305 rotates, the inner disk 901 will rotate accordingly, and the brake pad 905 will move outward under the action of centrifugal force and then contact the brake ring 11.

[0041] The inner disk 901 has a telescopic groove 907 on its outer edge, which intersects with the moving groove 903. A movable baffle 908 is installed inside the telescopic groove 907. One end of the baffle 908 is fixedly connected to an elastic rope 909, which is elastic and can extend and retract. The other end of the elastic rope 909 is fixedly connected to the inner wall of the telescopic groove 907. An electromagnet 906 is installed near the other end of the telescopic groove 907, close to the baffle 908. When the electromagnet 906 is energized, the baffle 908 is attracted by the electromagnet 906. The baffle 908 is attracted when the electromagnet 906 is energized, blocking the moving groove 903 and preventing the brake pad 905 from extending out of the inner disk 901, so that the equipment is not affected by the emergency braking mechanism 9 during normal operation.

[0042] The portion of the telescopic groove 907 that is cut off by the moving groove 903 and is far from the electromagnet 906 has a length greater than the length of the baffle 908. The baffle 908 can be completely retracted inside this section. When the electromagnet 906 is de-energized, the baffle 908 will not affect the movement of the brake pad 905.

[0043] The outer surface of the brake pad 905 is provided with several protrusions, and the inner surface of the brake ring 11 is provided with several concave points corresponding to the protrusions. When the brake pad 905 contacts the brake ring 11, it can greatly reduce the rotation speed of the inner disc 901, thereby reducing the rotation speed of the rotating roller 305.

[0044] Working principle: When the flexible rod 4 breaks or other sudden situation causes the rotation speed of the rotating roller 305 to run out of control, the electromagnet 906 receives a signal and automatically cuts off the power. The baffle 908 retracts into the telescopic groove 907 under the action of the elastic rope, and the brake pad 905 contacts the brake ring 11, which can reduce the speed of the rotating roller 305. When the equipment suddenly loses power, the electromagnet 906 will still lose its function, and the motor 301 will disengage from the control of the rotating roller 305. The emergency braking mechanism 9 can still control the rotation speed of the rotating roller 305.

[0045] The centering wheel assembly 6 includes a connecting rod 601, a connector 602, and a pull rod 603. A rotatable centering wheel 604 is provided in the middle of the connector 602. The connector 602 is fixedly connected to the outside of the support frame 1 through the connecting rod 601 and the pull rod 603. A U-shaped protective part 605 is provided on one side of the connector 602 and the connecting rod 601. The flexible rod 4 passes between the centering wheel 604 and the U-shaped protective part 605, which can ensure that the working area of ​​the flexible rod 4 remains vertical.

[0046] The above provides a detailed description of a flexible rod ultra-long stroke pumping unit provided by the present invention. Specific embodiments have been used to illustrate the principles and implementation methods of the invention. These embodiments are merely illustrative and are intended to aid in understanding the method and core concepts of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A flexible rod ultra-long stroke pumping unit, comprising a support frame (1), wherein an upper platform assembly (2) is provided on the top of the support frame (1), and a cage ladder (8) is fixedly connected to the outer side of the support frame (1), characterized in that, The top of the upper platform assembly (2) is provided with a drive device (3), the drive device (3) is connected to a flexible rod (4), the end of the flexible rod (4) is connected to an oil sucker plug (5), the support frame (1) is provided with a straightening wheel assembly (6) on the side away from the cage ladder (8), the flexible rod (4) passes through the straightening wheel assembly (6), and the drive device (3) is also connected to a counterweight balancing mechanism (7). The drive device (3) includes a support platform (309) and a motor (301). The support platform (309) is fixedly installed above the working platform (201). The motor (301) is installed above the support platform (309). A drive wheel (302) is fixedly installed at the output end of the motor (301). A support rod (304) is also installed above the working platform (201). The support rod (304) is located below the support platform (309). A rotating roller (305) is rotatably connected to the middle of the support rod (304). A driven wheel (308) is coaxially connected to the rotating roller (305). The driven wheel (308) and the drive wheel (302) are connected by a synchronous toothed belt (303). The rotating roller (305) is also coaxially connected to an emergency braking mechanism (9). The emergency braking mechanism (9) includes an inner disk (901) and an outer disk (10). The inner disk (901) is fixedly connected to the rotating roller (305), and the outer disk (10) is fixedly connected to the support platform (309). A brake ring (11) is provided between the inner disk (901) and the outer disk (10). The brake ring (11) is fixedly connected to the inner wall of the outer disk (10), and the brake ring (11) does not contact the inner disk (901). A central column (902) is provided in the middle of the inner disk (901). Several moving slots (903) are symmetrically distributed around the center of the central column (902) inside the inner disk (901). A spring (904) is provided inside the moving slot (903). One end of the spring (904) is fixedly connected to the central column (902), and the other end of the spring (904) is fixedly connected to a brake pad (905). The inner plate (901) has a telescopic groove (907) on its outer edge that intersects with the moving groove (903). A movable baffle (908) is provided inside the telescopic groove (907). One end of the baffle (908) is fixedly connected to an elastic rope (909), and the other end of the elastic rope (909) is fixedly connected to the inner wall of the telescopic groove (907). An electromagnet (906) is provided at the other end of the telescopic groove (907) near the baffle (908). When the electromagnet (906) is energized, the baffle (908) is attracted by the electromagnet (906). The length of the portion of the telescopic groove (907) that is cut off by the moving groove (903) away from the electromagnet (906) is greater than the length of the baffle (908).

2. The flexible rod ultra-long stroke pumping unit according to claim 1, characterized in that, The upper platform assembly (2) includes a working platform (201), which is fixedly installed on the top of the support frame (1), and a guardrail (202) is fixedly connected to the top of the working platform (201).

3. The flexible rod ultra-long stroke pumping unit according to claim 1, characterized in that, The rotating roller (305) is divided into two areas, namely the working area (306) and the balancing area (307). There are two balancing areas (307), located on both sides of the working area (306). The flexible rod (4) is wound around the outside of the rotating roller (305). A pull rope (703) is wound around the outside of the working area (306). The flexible rod (4) and the pull rope (703) are wound in opposite directions.

4. The flexible rod ultra-long stroke pumping unit according to claim 3, characterized in that, The counterweight balancing mechanism (7) includes a counterweight box (704), which is located inside the support frame (1). The top of the counterweight box (704) is connected to the pull rope (703). A rotating shaft (701) is also fixedly connected to the inner wall of the top of the support frame (1). A rotatable guide wheel (702) is sleeved on the outer side of the rotating shaft (701). The guide wheel (702) guides the pull rope (703).

5. The flexible rod ultra-long stroke pumping unit according to claim 1, characterized in that, The outer surface of the brake pad (905) is provided with several protrusions, and the inner surface of the brake ring (11) is provided with several concave points corresponding to the protrusions.

6. The flexible rod ultra-long stroke pumping unit according to claim 1, characterized in that, The straightening wheel assembly (6) includes a connecting rod (601), a connector (602), and a pull rod (603). A rotatable straightening wheel (604) is provided in the middle of the connector (602). The connector (602) is fixedly connected to the outside of the support frame (1) through the connecting rod (601) and the pull rod (603). A U-shaped protective part (605) is provided on one side of the connector (602) from the connecting rod (601). The flexible rod (4) passes between the straightening wheel (604) and the U-shaped protective part (605).

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