A balancing system, a method for installing the balancing system, and an ultra-long stroke pumping unit.

Abstract

This invention belongs to the field of petroleum extraction technology and discloses a balancing system, a balancing system installation method, and an ultra-long stroke pumping unit. The balancing system includes a balancing well, a support, a balancing component, a pulley, and a traction component. The balancing well is excavated on the ground and extends vertically, located on one side of the oil well along its horizontal direction and maintained at a predetermined distance. The support is detachably installed on the ground and positioned above the balancing well. The balancing component is movably installed within the balancing well along its extension direction. The pulley is rotatably mounted on the support. One end of the traction component is connected to the balancing component, and the other end is wound around the pulley and connected to the sucker rod. When the sucker rod moves up and down, the traction component drives the pulley to rotate, thereby moving the balancing component. This balancing system balances the load difference between the upper and lower strokes of the sucker rod while also expanding the movable range of the balancing component, ensuring the stroke length of the ultra-long stroke pumping unit and reducing the production cost of the balancing system.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a balancing system, a balancing system installation method, and an ultra-long stroke pumping unit. Background Technology

[0002] Long-stroke pumping units are a new type of oil pumping equipment characterized by long pumping stroke, large stroke, and stable operation, and are widely used in industries such as petroleum, chemical, and natural gas. However, due to the influence of loads such as the weight of the sucker rod, the weight of the liquid column, and the friction between the liquid column and the sucker rod string, the suspension point load of the long-stroke pumping unit changes continuously during the up-and-down reciprocating motion, and there is a load difference during the up-and-down motion. This results in unequal work done by the motor in the up-and-down strokes, which can easily lead to problems such as energy waste, reduced motor lifespan, and increased equipment vibration, and may even affect the normal operation of the sucker rod and pump. To solve this problem, existing long-stroke pumping units are equipped with a counterweight connected to the suspension point. During the up-stroke, the torque generated by the counterweight can counteract the torque generated by the weight of the sucker rod string and the liquid column, reducing the burden on the motor; during the down-stroke, the counterweight can store energy to help the sucker rod string fall smoothly, ensuring the normal operation of the long-stroke pumping unit.

[0003] Currently, most ultra-long stroke pumping units use tower-type supports. These supports are relatively tall and mounted on the ground. Pulleys and counterweights are installed on the tower supports, connected to the pulleys by steel cables, allowing the counterweights to move up and down on the tower supports. However, the height of the tower supports limits the vertical movement of the counterweights, thus restricting the stroke length of the ultra-long stroke pumping unit and affecting oil extraction efficiency. Increasing the range of counterweight movement would require increasing the height of the tower supports, which would not only increase the production cost of the ultra-long stroke pumping unit but also create numerous inconveniences for maintenance and well operations.

[0004] Therefore, there is an urgent need for a balancing system, a method for installing the balancing system, and an ultra-long stroke pumping unit to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a balancing system, a balancing system installation method, and an ultra-long stroke pumping unit. While balancing the load difference between the upper and lower strokes of the sucker rod, it also expands the movable range of the balancing components, ensuring the stroke length of the ultra-long stroke pumping unit and reducing the production cost of the balancing system.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The first aspect provides a balancing system for balancing the load difference of an ultra-long stroke pumping unit during its up and down strokes. The ultra-long stroke pumping unit includes a sucker rod, which is movably installed vertically within the oil well. The balancing system includes a balancing well, a support, a balancing component, a pulley, and a traction component. The balancing well is excavated on the ground and extends vertically, located on one side of the oil well along the horizontal direction and maintained at a predetermined distance from the oil well. The support is detachably installed on the ground and located above the balancing well. The balancing component is movably installed within the balancing well along its extension direction. The pulley is rotatably installed on the support. One end of the traction component is connected to the balancing component, and the other end is wound around the pulley and connected to the sucker rod. When the sucker rod moves up and down, the traction component can drive the pulley to rotate and the balancing component to move.

[0008] Optionally, a support pipe extending vertically is installed inside the balancing well. The support pipe can be connected to the ground to support the well wall.

[0009] Optionally, the bracket includes a connecting shaft, and a pulley is sleeved on the connecting shaft and rotatably engaged with the connecting shaft.

[0010] Optionally, the pulley is provided with a groove extending along its circumference, and the traction member is slidably embedded in the groove.

[0011] Optionally, the balancing system also includes a protective fence that can be installed on the ground and extends circumferentially along the balancing well, the protective fence being used to protect the wellhead of the balancing well.

[0012] Optionally, the balancing system also includes a protective cover, which is mounted on a bracket and has a protective space enclosed within it. A pulley is rotatably located within the protective space, and a traction component passes through the protective space.

[0013] Optionally, the depth of the balancing well is greater than the sum of the vertical length of the balancing component and the stroke length of the ultra-long stroke pumping unit.

[0014] Secondly, a balancing system installation method is provided, applicable to the aforementioned balancing system, comprising the following steps:

[0015] S1. Determine the excavation location of the balance well based on the location of the oil well and the preset distance, and excavate the balance well at the excavation location using excavation equipment;

[0016] S2. After the balance well is excavated, install the support frame above the balance well;

[0017] S3. Wrap the traction component around the pulley, and connect one end of the traction component to the sucker rod and the other end to the balance component;

[0018] S4. Use the traction device to lower the balancing device into the balancing well.

[0019] Optionally, a support pipe for supporting the well wall is provided inside the balancing well, and the balancing system also includes fasteners. Step S2 specifically includes the following steps:

[0020] S21. After the balance well is excavated, the support pipe is hoisted into the balance well using hoisting equipment and connected to the ground.

[0021] S22. Assemble the bracket and install the pulleys on the connecting shaft of the bracket;

[0022] S23. Use hoisting equipment to hoist the support to the wellhead of the balance well, and pass the fasteners through the support and secure them to the ground.

[0023] Thirdly, an ultra-long stroke pumping unit is provided, including a base, a drive unit, a sucker rod, and the aforementioned balancing system. The base is installed on the ground, the drive unit is located on the base, and the output end of the drive unit is connected to the sucker rod to drive the sucker rod to reciprocate up and down in the oil well. The balancing well of the balancing system is located on one side of the base along the horizontal direction, and the traction component of the balancing system is connected to the sucker rod.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention provides a balancing system, a method for installing the balancing system, and an ultra-long stroke pumping unit. A balancing well is excavated on the ground and extends vertically. A balancing component is movably installed within the balancing well. The balancing well provides ample space for the vertical movement of the balancing component, achieving a reduced support height while maintaining the range of motion of the balancing component, thus ensuring the stroke length of the ultra-long stroke pumping unit and reducing the production cost of the balancing system. A traction component is wound around a pulley, allowing its extension direction to be changed, enabling the balancing component connected to the traction component to move vertically. The other end of the traction component extends horizontally to the sucker rod located within the well. When the sucker rod moves up and down, it drives the traction component to move at its connected end. The traction component slides on the pulley, causing the pulley to rotate. The pulley rotation facilitates the reciprocating movement of the traction component, and simultaneously, the traction component also drives the balancing component to move up and down, thereby achieving a linkage between the balancing component and the sucker rod. When the drive unit of the ultra-long stroke pumping unit moves the sucker rod downwards, the weight of the sucker rod and the power of the drive unit both do work on the balancing component through the traction component, raising the balancing component and storing potential energy. When the drive unit moves the sucker rod downwards, the potential energy stored in the balancing component is released. This released potential energy, together with the drive unit, does work on the sucker rod, ensuring that the drive unit performs equal positive work during the up-and-down movement of the sucker rod. This reduces wear on the drive unit and the vibration and impact experienced by the ultra-long stroke pumping unit, improving oil extraction efficiency. Furthermore, the support frame is detachably mounted on the ground, facilitating installation and disassembly by workers on the ground. This allows the position of the balancing system provided by this invention to be adjusted according to the stroke length of the ultra-long stroke pumping unit. Attached Figure Description

[0026] Figure 1 A front view of the balancing system provided by the present invention;

[0027] Figure 2 A first flowchart of the balancing system installation method provided by the present invention;

[0028] Figure 3 The second flowchart is provided for the balancing system installation method of the present invention.

[0029] In the picture:

[0030] 1. Balancing well; 2. Support frame; 21. Connecting shaft; 3. Balancing component; 4. Pulley; 5. Traction component; 6. Flange; 7. Protective fence; 8. Warning sign; 9. Protective cover. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a balancing system that balances the load difference between the upper and lower strokes of the sucker rod while expanding the movable range of the balancing component 3, ensuring the stroke length of the ultra-long stroke pumping unit and reducing the production cost of the balancing system.

[0037] See Figure 1This balancing system is used to balance the load difference between the upper and lower strokes of an ultra-long stroke pumping unit. The ultra-long stroke pumping unit includes a sucker rod, which is movably installed vertically inside the oil well. The balancing system includes a balancing well 1, a support 2, a balancing component 3, a pulley 4, and a traction component 5. The balancing well 1 is excavated on the ground and extends vertically, located on one side of the oil well along the horizontal direction and maintained at a predetermined distance from the oil well. The support 2 is detachably installed on the ground and located above the balancing well 1. The balancing component 3 is movably installed inside the balancing well 1 along its extension direction. The pulley 4 is rotatably installed on the support 2. One end of the traction component 5 is connected to the balancing component 3, and the other end is wrapped around the pulley 4 and connected to the sucker rod. When the sucker rod moves up and down, the traction component 5 can drive the pulley 4 to rotate and the balancing component 3 to move. The predetermined distance is determined according to the stroke length of the ultra-long stroke pumping unit.

[0038] The balancing system provided in this embodiment has a balancing well 1 dug on the ground and extending vertically. A balancing component 3 is movably installed within the balancing well 1. The balancing well 1 provides sufficient space for the vertical movement of the balancing component 3, achieving a reduction in the height of the support 2 while maintaining the range of motion of the balancing component 3. This ensures the stroke length of the ultra-long stroke pumping unit and reduces the production cost of the balancing system. A traction component 5 is wound around a pulley 4, allowing its extension direction to be changed so that the balancing component 3 connected to the traction component 5 can move vertically. The other end of the traction component 5 can extend horizontally to the sucker rod located within the well. When the sucker rod moves up and down, it drives the traction component 5 to move at one end connected to it. The traction component 5 slides on the pulley 4, causing the pulley 4 to rotate. The rotation of the pulley 4 facilitates the reciprocating movement of the traction component 5. Simultaneously, the traction component 5 can also drive the balancing component 3 to move up and down, thus achieving the linkage between the balancing component 3 and the sucker rod. When the drive unit of the ultra-long stroke pumping unit drives the sucker rod downwards, the weight of the sucker rod and the power of the drive unit both do work on the balance member 3 through the traction member 5, raising the balance member 3 and storing potential energy. When the drive unit drives the sucker rod downwards, the potential energy stored in the balance member 3 is released. The released potential energy can work on the sucker rod together with the drive unit, so that the drive unit can do equal positive work when the sucker rod moves up and down. This reduces the wear on the drive unit and the vibration and impact experienced by the ultra-long stroke pumping unit, improving the efficiency of oil extraction. In addition, the support 2 is detachably installed on the ground, which facilitates the installation and removal of the support 2 by workers on the ground, allowing the position of the balancing system provided in this embodiment to be adjusted according to the stroke length of the ultra-long stroke pumping unit.

[0039] In this embodiment, the cross-sectional shape of the balancing well 1 is circular, the balancing component 3 is a cylinder, and the traction component 5 is connected to the center of the top surface of the balancing component 3 to ensure that the traction force of the traction component 5 can act on the center of gravity of the balancing component 3, thus ensuring the uniformity and stability of the force on the balancing component 3 during its movement.

[0040] Furthermore, the portion of the traction component 5 located between the pulley 4 and the balance component 3 extends vertically to ensure that the balance component 3 can be subjected to a vertical traction force, thereby preventing the balance component 3 from colliding with the well wall of the balance well 1 during movement.

[0041] For example, the balancing component 3 is made of steel, and the cross-sectional diameter of the balancing component 3 is slightly smaller than the cross-sectional diameter of the balancing well 1, so as to avoid friction between the well wall of the balancing well 1 and the balancing component 3, thereby affecting the movement of the balancing component 3.

[0042] In other embodiments, the cross-sectional shape of the balancing well 1 is rectangular, the balancing component 3 is a cuboid, and the traction component 5 is connected to the center of the top surface of the balancing component 3.

[0043] In this embodiment, the traction component 5 is made of compacted steel wire rope. Each steel wire in the compacted steel wire rope has been compacted, making the structure of the traction component 5 more compact, which can provide higher strength and load-bearing capacity, ensuring the stability of the balance component 3 during its up-and-down movement. Moreover, due to the more compact structure of the steel wire rope, the relative movement between the steel wires can be reduced, thereby improving the wear resistance and fatigue resistance of the steel wire rope, making the traction component 5 suitable for long-term heavy load and dynamic load applications.

[0044] Furthermore, the compacted strand wire rope adopts a compacted right-handed wire rope to further improve the strength and load-bearing capacity of the traction component 5; moreover, compared with the left-handed wire rope, the right-handed wire rope is relatively simpler to maintain, making the traction component 5 suitable for oil production environments with poor conditions.

[0045] Furthermore, the wire rope should be pre-tensioned before being connected to the balancer 3 and the sucker rod to eliminate internal stress, improve its performance, extend its service life, and enhance safety during oil extraction. During the up-and-down movement of the balancer 3, the wear condition of the wire rope should also be checked regularly to further ensure safety during oil extraction.

[0046] Furthermore, the specifications of the wire rope are determined by the specifications of the ultra-long stroke pumping unit. For example, when using a Type 18 pumping unit for ultra-long stroke pumping units, a wire rope with a diameter of 30 mm and a tensile strength of 653 kN can be selected.

[0047] In this embodiment, the support 2 is made of lightweight high-strength alloy material, such as aluminum alloy or high-strength steel, which helps to reduce the footprint and weight of the support 2 while ensuring that the support 2 has sufficient strength.

[0048] Furthermore, when designing the structure of support 2, the impact of natural factors such as wind load and earthquake on the structural safety of support 2 must be considered to ensure the stability and reliability of support 2 during use.

[0049] For example, the support 2 adopts a frame structure, which is usually modular in design and can be quickly assembled and disassembled, greatly simplifying the installation process of the support 2 and improving the construction efficiency of the balancing system installation. At the same time, the components of the disassembled support 2 are easy to store and transport, providing convenience for subsequent reuse. Moreover, the frame structure has high stability and reliability, enabling the support 2 to withstand large loads and ensuring safety in the oil extraction process.

[0050] For example, the various parts of the bracket 2 can be connected by high-strength bolts or welding, and the pulley 4 and the bracket 2 can also be connected by high-strength bolts or welding to ensure the robustness of the bracket 2 structure and the stability and reliability of the pulley 4 installed on the bracket 2.

[0051] Optionally, a support pipe extending vertically is installed inside the balancing well 1. The support pipe can be connected to the ground to support the well wall of the balancing well 1, prevent the soil inside the balancing well 1 from collapsing, and ensure the safety of the work site during the oil extraction process.

[0052] For example, the support pipe is a threaded steel pipe, which is connected to the ground via flange 6.

[0053] Optionally, the bracket 2 includes a connecting shaft 21, and a pulley 4 is sleeved on the connecting shaft 21 and rotates in cooperation with the connecting shaft 21 to realize the rotational connection between the pulley 4 and the bracket 2.

[0054] Specifically, the pulley 4 is provided with a through hole, and the connecting shaft 21 passes through the through hole and is in clearance fit with the hole wall so that the pulley 4 can rotate on the connecting shaft 21.

[0055] For example, the connecting shaft 21 is located at the top of the support 2, so that the range of movement of the balance component 3 is the sum of the depth of the balance well 1 and the height of the support 2, which further expands the range of movement of the balance component 3 and ensures the stroke length of the ultra-long stroke pumping unit.

[0056] Optionally, the pulley 4 is provided with a groove extending circumferentially therein, and the traction member 5 is slidably embedded in the groove. The groove can restrict the movement direction of the traction member 5 therein, so that the traction member 5 can only move along the circumferential direction of the pulley 4 and cannot move along the extension direction of the pulley 4, thereby ensuring the stability of the movement of the traction member 5 and reducing the risk of failure caused by the sliding or deviation of the traction member 5.

[0057] Optionally, see Figure 1The balancing system also includes a protective fence 7, which can be installed on the ground and extends around the circumference of the balancing well 1. The protective fence 7 is used to protect the wellhead of the balancing well 1 to prevent workers from accidentally falling into the balancing well 1, thus ensuring the safety of the oil extraction operation.

[0058] Further, see Figure 1 Warning signs 8 are installed on the protective fence 7 to remind staff of the presence of the balance well 1, in order to ensure the safety and health of the staff.

[0059] Optionally, see Figure 1 The balancing system also includes a protective cover 9, which is mounted on the support 2. A protective space is formed within the protective cover 9, within which the pulley 4 is rotatably located, and the traction component 5 passes through the protective space. The protective cover 9 encloses the pulley 4 to prevent foreign objects from falling onto it during oil extraction operations, thus affecting the movement of the traction component 5 or the rotation of the pulley 4, ensuring the smooth progress of oil extraction operations. The traction component 5 passes through the protective space to prevent the protective cover 9 from affecting its movement.

[0060] Specifically, the protective cover 9 is provided with a first connecting hole and a second connecting hole. The traction member 5 enters the protective space through the first connecting hole and is wound around the pulley 4 in the protective space. Then it passes out of the protective space through the second connecting hole.

[0061] For example, the protective cover 9 is made of a transparent material, such as plexiglass or acrylic, so that workers can observe the operation of the pulley 4 and the traction component 5 at all times during oil extraction operations.

[0062] Optionally, see Figure 1 The depth of the balancing well 1 is greater than the sum of the vertical length of the balancing component 3 and the stroke length of the ultra-long stroke pumping unit. This design ensures the integrity of the movement of the balancing component 3 within the balancing well 1. If the depth of the balancing well 1 were equal to the sum of the vertical length and stroke length of the balancing component 3, the balancing component 3 might not be able to move to the position corresponding to the maximum stroke length, thus affecting the stroke length of the ultra-long stroke pumping unit. Furthermore, due to factors such as inertia and friction, the balancing component 3 may experience some impact and vibration during movement. This design provides a buffer space for the balancing component 3, helping to reduce the impact and vibration experienced by both the balancing component 3 and the balancing well 1, thereby improving the stability of the balancing system.

[0063] For example, if the stroke length of the ultra-long stroke pumping unit is 12m and the vertical length of the balancing component 3 is 2m, then the depth of the balancing well 1 shall not be less than 14m.

[0064] Example 2

[0065] See Figure 2 and Figure 3 This embodiment provides a balancing system installation method, applied to the balancing system of Embodiment 1, including the following steps:

[0066] S1. Determine the excavation location of the balance well 1 based on the location of the oil well and the preset distance, and use excavation equipment to excavate the balance well 1 at the excavation location.

[0067] For example, the excavation equipment is an excavator.

[0068] Furthermore, step S0, preceding step S1, determines the parameters of the balancing system to ensure the accuracy of the balancing effect of the balancing component 3. Step S0 specifically includes the following steps:

[0069] S01. Determine the cross-sectional diameter D of the balance well 1: Determine the cross-sectional diameter D of the balance well 1 according to the specifications of common threaded steel pipes.

[0070] For example, common threaded steel pipe outer diameters include 529mm, 559mm, 610mm, 630mm, 660mm, 711mm and 720mm. When a 630mm threaded steel pipe is selected, the cross-sectional diameter D of the balance well 1 can be determined to be 630mm.

[0071] S02. Determine the specifications of the balancing component 3: First, calculate the weight G of the balancing component 3 based on the rated load F of the ultra-long stroke pumping unit. Then, calculate the volume V of the balancing component 3 based on the weight G. Finally, calculate the height H of the balancing component 3 (the length of the balancing component 3 in the vertical direction) based on the volume V of the balancing component 3 and the cross-sectional diameter D of the balancing well 1.

[0072] Specifically, in existing technologies, the weight G of the balancer 3 usually needs to be reasonably matched with the rated load F of the ultra-long stroke pumping unit. That is, there is a certain proportional relationship between the weight G of the balancer 3 and the rated load F of the ultra-long stroke pumping unit, and this ratio will vary depending on the model, specifications, and design requirements of the ultra-long stroke pumping unit. In this embodiment, the weight G of the balancer 3 is 70% of the rated load F of the ultra-long stroke pumping unit, i.e., G = 70%F. Subsequently, after determining the material of the balancer 3, the volume V of the balancer 3 can be obtained according to the formulas G = Mg and M = ρV; finally, the height H of the balancer 3 can be calculated according to the formula for the volume of a cylinder. Wherein, M is the mass of the balancer 3, g is the acceleration due to gravity, and ρ is the density of the balancer 3.

[0073] S03. Determine the depth of the balancing well 1: The minimum depth of the balancing well 1 can be calculated by the sum of the vertical length of the balancing component 3 and the stroke length of the ultra-long stroke pumping unit.

[0074] S2. After the excavation of the balance well 1 is completed, install the support 2 above the balance well 1.

[0075] Specifically, a support pipe for supporting the well wall of the balancing well 1 is provided inside the balancing well 1, and the balancing system also includes fasteners. Step S2 specifically includes the following steps:

[0076] S21. After the excavation of the balance well 1 is completed, the support pipe is hoisted into the balance well 1 using hoisting equipment and connected to the ground to support the well wall of the balance well 1.

[0077] For example, a crane is used as the lifting equipment.

[0078] Specifically, while excavating the balance well 1, a flange 6 interface is reserved at the wellhead to facilitate the connection of the support pipe to the ground.

[0079] S22. Assemble bracket 2 and install pulley 4 on connecting shaft 21 of bracket 2.

[0080] Specifically, the bracket 2 also includes two columns connected to the connecting shaft 21, with the two columns located at both ends of the connecting shaft 21. First, the pulley 4 is fitted onto the connecting shaft, and then the connecting shaft 21 is connected to the two columns.

[0081] S23. Use hoisting equipment to hoist the bracket 2 to the wellhead of the balance well 1, and pass fasteners through the bracket 2 and secure it to the ground to ensure that the bracket 2 will not shake at the wellhead of the balance well 1.

[0082] For example, the fasteners are high-strength anchor bolts.

[0083] S3. The traction member 5 is wound around the pulley 4, and one end of the traction member 5 is connected to the sucker rod, and the other end is connected to the balance member 3.

[0084] S4. Use the traction component 5 to lower the balance component 3 into the balance well 1. During the process of lowering the balance component 3, the balance component 3 should be lowered slowly and the position of the balance component 3 should be adjusted at any time to avoid collision between the balance component 3 and the balance well 1.

[0085] Specifically, when connecting the traction component 5 to the balance component 3 and the sucker rod, it is necessary to ensure that the traction component 5 is free from twisting and knotting so that the traction component 5 can move smoothly.

[0086] Furthermore, after step S4, the following steps are also included: installing a protective fence 7 at the wellhead of the balancing well 1 to protect both the wellhead of the balancing well 1 and the support 2.

[0087] For example, the protective fence 7 can be fixed to the ground by high-strength anchor bolts.

[0088] Example 3

[0089] This embodiment provides an ultra-long stroke pumping unit, including a base, a drive unit, a sucker rod, and a balancing system as described in Embodiment 1. The base is installed on the ground, the drive unit is located on the base, and the output end of the drive unit is connected to the sucker rod to drive the sucker rod to reciprocate up and down in the oil well. The balancing well 1 of the balancing system is located on one side of the base along the horizontal direction, and the traction component 5 of the balancing system is connected to the sucker rod.

[0090] In this embodiment, the ultra-long stroke pumping unit also includes a steering wheel and a drive wheel mounted on the base. The steering wheel and the balancing system are located on opposite sides of the drive wheel in the horizontal direction. The end of the traction member 5 away from the balancing member 3 is sequentially wound around the drive wheel and the steering wheel before being connected to the sucker rod. The steering wheel enables the traction member 5 to change from extending in the horizontal direction to extending in the vertical direction. The output end of the drive member is connected to the drive wheel and is used to drive the drive wheel to rotate forward or in reverse. When the drive wheel rotates forward, the drive wheel can drive the traction member 5 to move, thereby increasing the length of the traction member 5 between the drive member and the sucker rod and decreasing the length of the traction member 5 between the drive member and the balancing member 3, so that the sucker rod can move downward and the balancing member 3 can move upward. When the drive wheel rotates in reverse, the drive wheel drives the traction member 5 to move, thereby decreasing the length of the traction member 5 between the drive member and the sucker rod and increasing the length of the traction member 5 between the drive member and the balancing member 3, so that the sucker rod can move upward and the balancing member 3 can move downward.

[0091] For example, the driving element is a motor.

[0092] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A balancing system for balancing the load difference between the upper and lower strokes of an ultra-long stroke pumping unit, the ultra-long stroke pumping unit comprising a sucker rod movably disposed vertically within an oil well, characterized in that... The balancing system includes a balancing well (1), a support (2), a balancing component (3), a pulley (4), and a traction component (5). The balancing well (1) is dug into the ground and extends vertically. The balancing well (1) is located on one side of the oil well in the horizontal direction and maintains a preset distance from the oil well. The support (2) is detachably installed on the ground and located above the balancing well (1). The balancing component (3) is movably installed in the balancing well (1) along the extension direction of the balancing well (1). The pulley (4) is rotatably installed on the support (2). One end of the traction component (5) is connected to the balancing component (3), and the other end is wrapped around the pulley (4) and connected to the sucker rod. When the sucker rod moves up and down, it can drive the pulley (4) to rotate and the balancing component (3) to move through the traction component (5).

2. The balancing system according to claim 1, characterized in that, The balance well (1) is provided with a support pipe extending in a vertical direction. The support pipe can be connected to the ground and is used to support the well wall of the balance well (1).

3. The balancing system according to claim 1, characterized in that, The bracket (2) includes a connecting shaft (21), and the pulley (4) is sleeved on the connecting shaft (21) and rotates in cooperation with the connecting shaft (21).

4. The balancing system according to claim 1, characterized in that, The pulley (4) is provided with a groove extending along its circumference, and the traction member (5) is slidably embedded in the groove.

5. The balancing system according to any one of claims 1-4, characterized in that, The balancing system also includes a protective fence (7), which can be set on the ground and extends circumferentially along the balancing well (1). The protective fence (7) is used to protect the wellhead of the balancing well (1).

6. The balancing system according to any one of claims 1-4, characterized in that, The balancing system also includes a protective cover (9), which is disposed on the bracket (2). A protective space is formed inside the protective cover (9), the pulley (4) is rotatably located in the protective space, and the traction member (5) passes through the protective space.

7. The balancing system according to any one of claims 1-4, characterized in that, The depth of the balancing well (1) is greater than the sum of the vertical length of the balancing component (3) and the stroke length of the ultra-long stroke pumping unit.

8. A method for installing a balancing system, applied to the balancing system as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Determine the excavation location of the balance well (1) based on the location of the oil well and the preset distance, and excavate the balance well (1) at the excavation location using excavation equipment; S2. After the balance well (1) is excavated, install the support (2) above the balance well (1); S3. The traction member (5) is wound around the pulley (4), and one end of the traction member (5) is connected to the sucker rod, and the other end is connected to the balance member (3); S4. Using the traction member (5), the balancing member (3) is lowered into the balancing well (1).

9. The balancing system installation method according to claim 8, characterized in that, The balancing well (1) is provided with a support pipe for supporting the well wall. The balancing system also includes fasteners. Step S2 specifically includes the following steps: S21. After the balance well (1) is excavated, the support pipe is hoisted into the balance well (1) using hoisting equipment and connected to the ground. S22. Assemble the bracket (2) and install the pulley (4) on the connecting shaft (21) of the bracket (2); S23. Using the hoisting equipment, the bracket (2) is hoisted to the wellhead of the balance well (1), and the fastener is passed through the bracket (2) and fastened to the ground.

10. An ultra-long stroke oil pumping unit, characterized in that, The system includes a base, a drive unit, a sucker rod, and a balancing system as described in any one of claims 1-7. The base is installed on the ground, the drive unit is disposed on the base, and the output end of the drive unit is connected to the sucker rod for driving the sucker rod to reciprocate up and down in the oil well. The balancing well (1) of the balancing system is located on one side of the base along the horizontal direction, and the traction unit (5) of the balancing system is connected to the sucker rod.

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