Flexible rod super-long stroke pumping unit

Abstract

The invention discloses a flexible rod super-long stroke oil pumping unit, and belongs to the technical field of oil pumping units, the flexible rod super-long stroke oil pumping unit comprises a support frame, an upper platform assembly is arranged at the top of the support frame, a cage ladder is fixedly connected to the outer side of the support frame, a driving device is arranged at the top of the upper platform assembly, and the driving device is fixedly connected to the outer side of the support frame. The driving device is connected with a flexible rod, the tail end of the flexible rod is connected with an oil pumping plug, a centralizing wheel assembly is arranged on the side, away from the cage ladder, of the supporting frame, the flexible rod penetrates through the centralizing wheel assembly, and the driving device is further connected with a counterweight balance mechanism. According to the flexible rod super-long stroke oil pumping unit, up-down reciprocating motion of an oil pumping rod is achieved through winding and releasing of a flexible polish rod on a roller. Compared with various non-beam-pumping units newly developed on the market, the non-beam-pumping unit has the advantages of being simple in structure, small in occupied area, capable of achieving 18-meter ultra-long stroke, low in stroke frequency, convenient to maintain and the like.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, and in particular to a flexible rod ultra-long stroke oil pumping unit. Background Art

[0002] At present, in the process of oil extraction, pumping units are widely used in oilfield development as a key downhole oil production equipment. Traditional pumping units are mainly beam pumping units, which have been used for a long time due to their mature design and reliable use. However, with the increasing demand for deep wells, high-yield oil wells and special geological conditions, traditional beam pumping units have gradually exposed some limitations: the stroke length of beam pumping units is usually limited by the mechanical structure and is generally difficult to exceed 10 meters, which is insufficient in the extraction of deep wells and high-yield oil wells. The insufficient stroke length leads to limited liquid lifting per unit time, thereby affecting the oil production efficiency of the oil well. The structure of the beam pumping unit is relatively complex, including the beam, balance block and long connecting rod mechanism, etc., which occupies a large area. Under the conditions of intensive operation and limited space in the oil field, it is difficult to arrange the equipment, which affects the resource utilization rate. During the operation of the traditional beam pumping unit, the friction between the mechanical parts is large and the operating efficiency is low. At the same time, due to its complex transmission structure, the energy consumption is high, which is not conducive to the energy conservation and emission reduction goals of the oil field. The beam pumping unit has many parts and a complex mechanical structure, which makes it prone to wear and failure. Its maintenance process is complicated and costly, which affects the production efficiency of the oil field and the economic efficiency of the equipment.

[0003] In response to the above problems, beamless pumping units have gradually become a hot topic in industry research. This type of pumping unit eliminates the traditional beam mechanism and adopts cable drive, hydraulic drive and other methods to simplify the structure and reduce the footprint. However, the beamless pumping units currently on the market still have the following shortcomings:

[0004] Although beamless pumping units have overcome the stroke limitations of traditional beam pumping units to a certain 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 mining. Some beamless pumping units still have safety hazards in the design of key components. For example, when the motor stops or the power is suddenly cut off, rapid braking cannot be achieved, posing the risk of equipment damage or safety accidents. Due to technical limitations, some beamless pumping units have poor stability under high load or long-term operation, and are prone to equipment vibration and performance degradation. Summary of the invention

[0005] The current pumping unit technology, whether it is the traditional beam type or the new beamless type, has certain technical bottlenecks and room for improvement. Therefore, there is an urgent need for a new type of pumping unit with a simple structure, small footprint, ultra-long stroke, low stroke frequency, reliable operation, and high safety performance to meet the actual needs of oil field exploitation.

[0006] The purpose of the present invention is to provide a flexible rod ultra-long stroke oil pumping unit, which realizes the up and down reciprocating motion of the oil pumping rod by winding and releasing the flexible rod on the drum. Compared with various types of beamless oil pumping units newly developed on the market, it has the characteristics of simple structure, small footprint, 18-meter ultra-long stroke, low stroke frequency, easy maintenance, etc.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A flexible rod ultra-long stroke oil pumping unit comprises a support frame, an upper platform assembly is arranged on the top of the support frame, a cage ladder is fixedly connected to the outer side of the support frame, a driving device is arranged on the top of the upper platform assembly, the driving device is connected to a flexible rod, the end of the flexible rod is connected to an oil pumping plug, a righting wheel assembly is arranged on the side of the support frame away from the cage ladder, the flexible rod passes through the righting wheel assembly, and the driving device is also connected to a counterweight balancing mechanism.

[0009] Preferably, the upper platform assembly includes a working platform, the working platform is fixedly mounted 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 supporting platform and a motor, the supporting platform is fixedly installed above the working platform, the motor is installed above the supporting platform, a driving wheel is fixedly installed at the output end of the motor, a supporting rod is also installed above the working platform, the supporting rod is located below the supporting platform, a rotating roller is rotatably connected to the middle part of the supporting rod, the rotating roller is coaxially connected to a driven wheel, and the driven wheel and the driving wheel are connected by a synchronous toothed belt transmission.

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

[0012] The winding directions of the flexible rod and the pull rope are opposite.

[0013] Preferably, the counterweight balancing mechanism includes a counterweight box body, which is located inside the support frame. The top of the counterweight box body is connected to the pull rope. A rotating shaft is also fixedly connected to the top inner wall of the support frame. A rotatable guide wheel is provided 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 with an emergency brake mechanism, the emergency brake mechanism comprises an inner disk and an outer disk, a brake ring is arranged between the inner disk and the outer disk, the brake ring is fixedly connected to the inner wall of the outer disk, and the brake ring does not contact the inner disk;

[0015] A central column is arranged in the middle of the inner disk, and a plurality of movable grooves are symmetrically distributed around the center of the central column inside the inner disk, and a spring is arranged inside the movable groove, one end of the spring is fixedly connected to the central column, and the other end of the spring is fixedly connected to the brake pad.

[0016] Preferably, a telescopic slot whose path intersects with the movable slot is provided inside the outer edge of the inner disk, a movable baffle is provided inside the telescopic slot, one end of the baffle is fixedly connected to an elastic rope, the other end of the elastic rope is fixedly connected to the inner wall of the telescopic slot, an electromagnet is provided in the telescopic slot near the other end of the baffle, and the baffle is attracted by the electromagnet when the electromagnet is energized;

[0017] The length of the portion of the telescopic slot that is cut off by the movable slot and is far away from the electromagnet is greater than the length of the blocking piece.

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

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

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention sets the flexible rod as the sucker rod. When the motor performs reciprocating motion, 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, compared with the traditional pumping unit, its stroke is greatly improved, and the corresponding stroke frequency is greatly reduced, 1 / 3 of the conventional pumping unit. The service life of the valve ball and valve seat is greatly improved. After the stroke frequency is significantly reduced, the number of load alternations 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 stroke frequency can cooperate with the non-metallic sucker rod to work more efficiently. The reversing flexibility is controllable, which can improve the working condition of the well fluid entering the pump and improve the pump efficiency. The ultra-long stroke and low stroke frequency can effectively reduce the eccentric wear of the pipe and rod.

[0022] (2) The present invention is provided with an emergency braking mechanism. When the flexible rod breaks or other unexpected conditions occur, causing the rotating roller to lose 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 achieve the purpose of slowing down the rotating roller. When the equipment suddenly loses power, the electromagnet will still lose its function, and the motor will lose control of the rotating roller. The emergency braking mechanism can still achieve the purpose of controlling the rotating roller speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention;

[0024] Figure 2 This is a schematic diagram from another angle of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention;

[0025] Figure 3 A schematic diagram of the structure of a driving device of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention;

[0026] Figure 4 This is a schematic structural diagram of a straightening wheel assembly of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention;

[0027] Figure 5 A schematic diagram of an emergency brake mechanism of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention;

[0028] Figure 6 This is a cross-sectional view of the emergency brake mechanism of a flexible rod ultra-long stroke oil pumping unit proposed by the present invention.

[0029] In the figure: 1, support frame; 2, upper platform assembly; 201, working platform; 202, guardrail; 3, driving device; 301, motor; 302, driving wheel; 303, synchronous toothed belt; 304, support rod; 305, rotating roller; 306, working area; 307, balancing area; 308, driven wheel; 309, supporting platform; 4, flexible rod; 5, oil pumping plug; 6, straightening wheel assembly; 601, connecting rod; 602, connector; 603 , pull rod; 604, righting wheel; 605, U-shaped protective piece; 7, counterweight balancing mechanism; 701, rotating shaft; 702, guide wheel; 703, pull rope; 704, counterweight box; 8, cage ladder; 9, emergency brake mechanism; 901, inner plate; 902, center column; 903, moving slot; 904, spring; 905, brake pad; 906, electromagnet; 907, telescopic slot; 908, baffle; 909, elastic rope; 10, outer plate; 11, brake ring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1 - Figure 6 A flexible rod ultra-long stroke oil pumping unit comprises a support frame 1, an upper platform assembly 2 is arranged on the top of the support frame 1, a cage ladder 8 is fixedly connected to the outer side of the support frame 1, the cage ladder 8 is convenient for the staff to move up and down the control box to inspect the equipment, a driving device 3 is arranged on the top of the upper platform assembly 2, the driving device 3 provides power for the whole equipment, the driving device 3 is connected with a flexible rod 4, the flexible rod 4 is made of flexible material and can be wound, and the end of the flexible rod 4 is connected with an oil pumping plug 5, a righting wheel assembly 6 is arranged on the side of the support frame 1 away from the cage ladder 8, the flexible rod 4 passes through the righting wheel assembly 6, the righting wheel assembly 6 is used to make the working section of the flexible rod 4 in a vertical state, so as to facilitate the oil pumping work, the driving device 3 is also connected with a counterweight balancing mechanism 7, the counterweight balancing mechanism 7 is used to make the device in a gravity balance state when the oil pumping plug 5 moves up and down, so as to prevent the equipment from tipping over.

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

[0033] The driving device 3 includes a support platform 309 and a motor 301. The motor 301 provides power for the entire device. The support platform 309 is fixedly installed above the working platform 201. The motor 301 is installed above the support platform 309. A driving 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. The rotating roller 305 is coaxially connected to a driven wheel 308. The driven wheel 308 and the driving wheel 302 are connected through a synchronous toothed belt 303. When the motor 301 is started, it will drive the driving wheel 302 to rotate. The rotation of the driving wheel 302 drives the driven wheel 308 to rotate through the synchronous toothed belt 303, and then drives the rotating roller 305 to rotate.

[0034] The rotating roller 305 is divided into two areas, namely a working area 306 and a 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, which are respectively located on both sides of the working area 306. The flexible rod 4 is wound on the outside of the rotating roller 305, and a pull rope 703 is wound on the outside of the working area 306.

[0035] The winding directions of the flexible rod 4 and the pull rope 703 are opposite, 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 pumping plug 5 is raised or lowered at the same time, ensuring the overall center of gravity balance of the equipment.

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

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

[0038] When the motor 301 performs reciprocating motion, the flexible rod 4 repeatedly winds and releases, driving the sucker plug 5 to rise or fall. Since the flexible rod 4 can be set to a longer length, compared with the traditional oil pumping unit, its stroke is greatly improved and the corresponding stroke frequency is greatly reduced, 1 / 3 of the conventional oil pumping unit. The service life of the valve ball and valve seat is greatly improved. After the stroke frequency is significantly reduced, the number of load alternations 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 stroke frequency can cooperate with the non-metallic sucker rod to work more efficiently. The reversing flexibility is controllable, which can improve the working condition of the well fluid entering the pump and improve the pump efficiency. The ultra-long stroke and low stroke frequency can effectively reduce the eccentric wear of the pipe and rod.

[0039] The rotating roller 305 is also coaxially connected with an emergency brake mechanism 9, which 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 with the rotating roller 305, while the outer disk 10 remains fixed. A brake ring 11 is arranged between the inner disk 901 and the outer disk 10. The inner wall of the brake ring 11 is rough. 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.

[0040] A central column 902 is provided in the middle of the inner disk 901, and a plurality of movable 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 movable groove 903, and 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 rotates accordingly, and the brake pad 905 moves outward under the action of centrifugal force and then contacts the brake ring 11.

[0041] An expansion slot 907 whose path intersects with the movable slot 903 is provided inside the outer edge of the inner disk 901, and a movable baffle 908 is arranged inside the expansion slot 907. An elastic rope 909 is fixedly connected to one end of the baffle 908. The elastic rope 909 has elastic force and can be extended and retracted. The other end of the elastic rope 909 is fixedly connected to the inner wall of the expansion slot 907. An electromagnet 906 is provided in the other end of the expansion slot 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 adsorbed when the electromagnet 906 is energized, blocking the movable slot 903 and preventing the brake pad 905 from extending out of the inner disk 901, so that the equipment will not be affected by the emergency brake mechanism 9 when it works normally.

[0042] The length of the portion of the telescopic slot 907 cut off by the movable slot 903 and away from the electromagnet 906 is greater than the length of the baffle 908. The baffle 908 can be completely retracted inside this section. When the electromagnet 906 is powered off, 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, the rotation speed of the inner disk 901 can be greatly reduced, thereby reducing the rotation speed of the rotating roller 305.

[0044] Working principle: When the flexible rod 4 breaks or other emergencies occur, causing the speed of the rotating roller 305 to lose control, the electromagnet 906 receives a signal and automatically cuts off the power, and the baffle 908 is retracted into the telescopic groove 907 under the action of the elastic rope, and the brake pad 905 contacts the brake ring 11, which can slow down the rotating roller 305; when the equipment suddenly loses power, the electromagnet 906 will still lose its function, and the motor 301 will lose control of the rotating roller 305, and the emergency brake mechanism 9 can still control the speed of the rotating roller 305.

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

[0046] The above is a detailed introduction to a flexible rod ultra-long stroke oil pumping unit provided by the present invention. This article uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, 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 oil pumping unit, comprising a support frame (1), an upper platform assembly (2) is arranged on the top of the support frame (1), a cage ladder (8) is fixedly connected to the outer side of the support frame (1), and is characterized in that: A driving device (3) is arranged on the top of the upper platform assembly (2), the driving device (3) is connected to a flexible rod (4), the end of the flexible rod (4) is connected to an oil pumping plug (5), a straightening wheel assembly (6) is arranged on the side of the support frame (1) away from the cage ladder (8), the flexible rod (4) passes through the straightening wheel assembly (6), and the driving device (3) is also connected to a counterweight balancing mechanism (7).

2. The flexible rod ultra-long stroke oil pumping unit according to claim 1, characterized in that: The upper platform assembly (2) comprises a working platform (201), wherein the working platform (201) is fixedly mounted 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 oil pumping unit according to claim 2, characterized in that: The driving device (3) comprises a supporting platform (309) and a motor (301), wherein the supporting platform (309) is fixedly mounted above the working platform (201), the motor (301) is mounted above the supporting platform (309), a driving wheel (302) is fixedly mounted on the output end of the motor (301), a supporting rod (304) is also mounted above the working platform (201), the supporting rod (304) is located below the supporting platform (309), a rotating roller (305) is rotatably connected to the middle of the supporting rod (304), the rotating roller (305) is coaxially connected to a driven wheel (308), and the driven wheel (308) and the driving wheel (302) are connected via a synchronous toothed belt (303).

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

5. The flexible rod ultra-long stroke oil pumping unit according to claim 4, characterized in that: The counterweight balancing mechanism (7) comprises a counterweight box (704), wherein 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 fixedly connected to the inner wall of the top of the support frame (1), and a rotatable guide wheel (702) is sleeved on the outer side of the rotating shaft (701), and the guide wheel (702) plays a guiding role for the pull rope (703).

6. The flexible rod ultra-long stroke oil pumping unit according to claim 4, characterized in that: The rotating roller (305) is also coaxially connected to an emergency brake mechanism (9), the emergency brake mechanism (9) comprising an inner disk (901) and an outer disk (10), the inner disk (901) being fixedly connected to the rotating roller (305), the outer disk (10) being fixedly connected to the support platform (309), a brake ring (11) being arranged between the inner disk (901) and the outer disk (10), the brake ring (11) being fixedly connected to the inner wall of the outer disk (10), and the brake ring (11) not being in contact with the inner disk (901); A central column (902) is provided in the middle of the inner disk (901), and a plurality of movable grooves (903) are symmetrically distributed around the center of the central column (902) inside the inner disk (901), and a spring (904) is provided inside the movable 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).

7. The flexible rod ultra-long stroke oil pumping unit according to claim 6, characterized in that: The inner edge of the inner disk (901) is provided with a telescopic groove (907) whose path intersects with the movable 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); 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 near the other end of the baffle (908) of the telescopic groove (907); and the baffle (908) is attracted by the electromagnet (906) when the electromagnet (906) is powered on; The length of the portion of the telescopic slot (907) cut off by the movable slot (903) and away from the electromagnet (906) is greater than the length of the blocking piece (908).

8. The flexible rod ultra-long stroke oil pumping unit according to claim 8, characterized in that: The outer surface of the brake pad (905) is provided with a plurality of convex points, and the inner surface of the brake ring (11) is provided with a plurality of concave points corresponding to the convex points.

9. The flexible rod ultra-long stroke oil pumping unit according to claim 1, characterized in that: The straightening wheel assembly (6) comprises a connecting rod (601), a connector (602), and a pull rod (603); a rotatable straightening wheel (604) is arranged in the middle of the connector (602); the connector (602) is fixedly connected to the outer side of the support frame (1) through the connecting rod (601) and the pull rod (603); a U-shaped protective piece (605) is arranged on one side of the connector (602) and the connecting rod (601); and the flexible rod (4) passes between the straightening wheel (604) and the U-shaped protective piece (605).

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