Low-abrasion high-stress-bearing hectometer-stroke pumping unit

Abstract

The invention relates to the technical field of land and offshore oil production, in particular to a low-abrasion high-stress-bearing hectometer-stroke oil pumping unit, the stroke can reach 50-100 meters, the low-abrasion high-stress-bearing hectometer-stroke oil pumping unit comprises an oil pumping rod driven by a driving mechanism, the driving mechanism is arranged at the top end of a support, and a plurality of cables are hung on a driving wheel of the driving mechanism; one end of the cable is connected with the connecting assembly through the fixing assembly, and the connecting assembly is connected with a sucker rod; the multiple cables are connected to the sucker rod through the connecting assembly to increase the upper limit of the bearing capacity applied to the sucker rod, the bearing capacity of the driving wheel is changed by changing the number of the cables through the connecting assembly and changing the weight of the balance weight through the operating assembly, and therefore the driving force on the sucker rod is changed, and the oil pumping working condition requirement of an oil well is met.

Description

Technical Field

[0001] The invention relates to the technical field of onshore and offshore oil production, and in particular to a 100-meter stroke oil pumping unit with low wear and high stress bearing. Background Art

[0002] The pumping units used in oil extraction mainly include beam pumping units, progressive cavity pumps (PCP), electric submersible pumps (ESP) and other types. Beam pumping units are the most common type of pumping units, also known as "kowtow machines". They use electric motors on the ground to drive the beam and drive the downhole pump to reciprocate, thereby pumping crude oil to the ground. The stroke of existing pumping units is relatively short, and a larger surface equipment is required to achieve a large stroke.

[0003] In order to achieve a long stroke of the oil pumping unit, the prior art has adopted a drum and a cable to drive the sucker rod, and the cable connected to the sucker rod is wound on the drum, which has a spiral rope groove. In order to ensure that the rope outlet point on the drum remains unchanged, the drum needs to be translated during the process of rotating the drum to wind the cable, such as the translational oil pumping unit in ZL202410748742.6. The above mechanism is complex to control and the cable winding on the drum is likely to cause friction between the cable and the rope groove, which aggravates the wear of the cable.

[0004] In addition, the pumping conditions are constantly changing during the life cycle of an oil field. The force required for pumping changes dynamically during the life cycle of an oil field, and is affected by many factors, such as reservoir pressure, fluid properties, water content, wellbore conditions, equipment wear, and production methods. As production progresses, reservoir pressure gradually decreases, resulting in an increase in the force required for pumping to overcome a greater pressure difference. The viscosity of crude oil may increase due to a drop in temperature or gas precipitation, resulting in increased pumping resistance and the need for greater pumping force. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a special cantilever crane for underground mines. The bearing capacity of the driving wheel is changed by changing the number of cables through a connecting component and the weight of the counterweight through an operating component, thereby changing the driving force on the sucker rod and meeting the requirements of the oil well pumping conditions. The driving wheel cooperates with the counterweight to drive the cable to achieve a stroke of 100 meters and reduce the wear on the cable. The pumping unit with a stroke of 100 meters of the present invention can achieve long siphon suction of the formation and can unblock blockages in the formation. The pumping unit with a stroke of 100 meters expands the suction area of ​​a single well, saves comprehensive costs and reduces equipment wear.

[0006] To achieve the above object, the present invention provides the following technical solutions: A 100-meter stroke oil pumping unit with low wear and high stress load, comprising a sucker rod driven by a driving mechanism, the driving mechanism being arranged at the top of a bracket, and a plurality of cables being mounted on the driving wheel of the driving mechanism; one end of the cable is connected to the connecting assembly through a fixing assembly, and the connecting assembly is connected to the sucker rod; a plurality of cables are connected to the sucker rod through the connecting assembly to increase the upper limit of the bearing force applied to the sucker rod; after the other end of the cable passes around the movable pulley of the counterweight, the end of the cable is connected to the fixing plate at the top of the bracket through the fixing assembly; a rope clamp is arranged on the cable between the driving mechanism and the connecting assembly, and the rope clamp is fixed at a position on the bracket close to the driving mechanism; the rope clamp is used to prevent horizontal twisting of the plurality of cables; an operating assembly is arranged at the upper limit position of the bracket corresponding to the counterweight; the number of counterweight blocks in the counterweight is increased / decreased by the operating assembly.

[0007] Furthermore, the driving wheel is provided with a plurality of annular rope grooves; the plurality of cables are respectively arranged in the rope grooves, and the output end of the motor is connected to the driving wheel to drive the cables; the motor is fixed on the top beam at the top end of the column of the bracket; the connecting assembly is slidably arranged on the second guide rail of the bracket, and the counterweight is slidably arranged on the first guide rail of the bracket; the first guide rail and the second guide rail are fixed to the column of the bracket through a cross frame.

[0008] Furthermore, the rope clamp is arranged on a bracket below the top beam; the rope clamp includes a bracket and two rotatable clamping rollers arranged on the bracket; a plurality of clamping grooves are arranged on the clamping rollers; the clamping grooves on the two clamping rollers are closed to form a closed space, the cable passes through the closed space, and the closed space limits the lateral movement of the cable.

[0009] Furthermore, the connecting assembly includes a top plate and a bottom plate fixed at the lower end of the top plate; the top plate is connected to the cables through multiple fixing assemblies; the bottom plate is fixedly connected to the sucker rod; sliders are respectively provided on both sides of the top plate, and the sliders are clamped with the second guide rail.

[0010] Furthermore, a plurality of fixing holes are provided on the top plate; one end of the fixing component is fixedly connected to the cable, and a connecting portion at the other end of the fixing component is fixedly connected to the fixing hole; the connecting portion and the fixing hole are detachable structures.

[0011] Furthermore, the fixing assembly has a shell, and the fixing rod of the shell has a connecting portion; a wedge block is provided in the shell, and the wedge block is socketed with the socket portion of the cable; the end of the cable is fixed by a clamping block; a cover plate is provided on the shell to abut the side of the wedge block.

[0012] Furthermore, one end of the wedge block is a narrow end, and the other end is a wide end, and the narrow end faces the end of the cable; the sleeve portion of the cable is sleeved in the limiting groove of the wedge block; the shell is provided with a wedge-shaped portion, and the wedge-shaped portion cooperates with the wedge block so that the pulling force of the cable on the fixing assembly causes the wedge block to be displaced toward the narrow end of the wedge block relative to the wedge-shaped portion; the wedge-shaped portion of the shell squeezes the sleeve portion of the cable in the limiting groove of the wedge block, thereby generating a greater fastening force.

[0013] Furthermore, the movable pulley of the counterweight is arranged at the top of the counterweight frame, and a plurality of annular rope grooves are arranged on the movable pulley; guide blocks are respectively arranged at the upper and lower parts of both sides of the counterweight frame; the guide blocks are slidably arranged on the first guide rail; the column of the counterweight frame has two oppositely arranged flanges, and the two ends of the counterweight block are respectively clamped between the two flanges; a plurality of counterweight blocks are stacked and fixed in the counterweight frame, and a fixed pressure rod is arranged on the counterweight block at the top; and an opening for taking and placing the counterweight block is arranged on the upper part of the flange of the counterweight frame.

[0014] Furthermore, the operating component includes a base fixedly connected to the bracket, and a plurality of counterweights are placed on the base through a limit rod; a liftable lifting plate is provided on the base through a plurality of guide columns, and a lifting cylinder is provided between the middle part of the lifting plate and the base; a translatable bearing plate is provided on the lifting plate, and a translation cylinder is provided between the bearing plate and the lifting plate to drive the bearing plate to slide relative to the lifting plate; a retractable fork is provided on the bearing plate, and a fork cylinder is provided between the fork and the bearing plate to drive the fork to retract; the fork can be extended into the slot of the counterweight to carry out the picking and placing operation of the counterweight between the base of the operating component and the counterweight frame of the counterweight.

[0015] Furthermore, after the counterweight stops at the upper limit position of the bracket, the fork extends into the slot of the counterweight block on the base; the counterweight block is lifted and translated by the lifting plate, the load-bearing plate and the fork, so that the counterweight block passes through the opening of the counterweight frame and is stacked on the counterweight frame.

[0016] Compared with the prior art, the present invention provides a 100-meter stroke oil pumping unit with low wear and high stress bearing, which has the following beneficial effects: by using the annular rope groove on the driving wheel to drive the cable connected to the pumping rod, compared with the method of winding the cable on the drum using the spiral rope groove in the prior art, the present invention can reduce the wear of the rope groove on the cable, and prevent the lateral shaking and twisting of the cable through the rope clamp on the lower side of the driving wheel and the guide rail on the connecting component, and prevent the cable from skipping and interfering on the rope groove of the driving wheel, thereby avoiding the above-mentioned phenomenon The resulting wear of the rope groove on the cable; the total static friction of the driving wheel of the present invention on the cable is the driving force for the sucker rod, and the number of connected cables can be changed in different life cycles of the oil well through the connecting component, and the number of counterweight blocks in the counterweight can be changed in conjunction with the operating component, thereby changing the driving force on the sucker rod to meet the pumping conditions in different periods. The oil pumping unit with a stroke of 100 meters of the present invention can achieve long siphon suction of the formation and can unblock blockages in the formation. The oil pumping unit with a stroke of 100 meters expands the suction area of ​​a single well, saves comprehensive costs and reduces equipment wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the low-wear and high-stress-bearing 100-meter stroke oil pumping unit of the present invention; Figure 2 A side view of the oil pumping unit of the present invention; Figure 3 It is a disconnection schematic diagram of the connection assembly of the present invention; Figure 4 It is a structural schematic diagram of the connection assembly of the present invention; Figure 5 An exploded view of the fixing assembly of the present invention; Figure 6 It is a structural schematic diagram of the top of the oil pumping unit of the present invention; Figure 7 It is a structural schematic diagram of the counterweight of the present invention; Figure 8 It is a structural schematic diagram of the operating components of the present invention; Fig. 9 A schematic diagram of the operating assembly of the present invention forking a counterweight; Fig.10 A schematic diagram of another perspective of the operating assembly of the present invention forking a counterweight; In the figure: Driving mechanism 1, driving wheel 11, rope groove 111, motor 12; Connecting assembly 2, top plate 21, fixing hole 210, bottom plate 22, slider 23; Counterweight 3, counterweight frame 31, flange 311, opening 312, movable pulley 32, counterweight block 33, slot 331, guide block 34, fixed pressure rod 35; Bracket 4, column 41, top beam 42, cross frame 43, first guide rail 44, second guide rail 45, fixing plate 46; Cable 5, sleeve portion 51, end 52; Rope clamp 6, bracket 61, clamping roller 62, clamping groove 620; The fixing assembly 7, the housing 71, the wedge-shaped portion 711, the fixing rod 712, the connecting portion 713, the clamping block 72, the wedge block 73, the limiting groove 731, and the cover plate 74; Operating assembly 8, base 81, lifting plate 82, guide column 821, carrying plate 83, fork 84, limit rod 85, translation cylinder 86, fork cylinder 87, lifting cylinder 88; Sucker rod 9. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention is described in detail below with reference to the accompanying drawings. The low-wear and high-stress bearing 100-meter stroke oil pumping unit of the present invention comprises a sucker rod 9 driven by a driving mechanism 1, wherein the driving mechanism 1 is arranged at the top end of a bracket 4, and a plurality of cables 5 are mounted on a driving wheel 11 of the driving mechanism 1; one end of the cable 5 is connected to the connecting assembly 2 through a fixing assembly 7, and the connecting assembly 2 is connected to the sucker rod 9; a plurality of cables 5 are connected to the sucker rod 9 through the connecting assembly 2 to increase the upper limit of the bearing capacity applied to the sucker rod 9; the other end of the cable 5 After one end passes around the movable pulley 32 of the counterweight 3, the end of the cable 5 is connected to the fixing plate 46 on the top of the bracket 4 through the fixing component 7; a rope clamp 6 is provided on the cable 5 between the driving mechanism 1 and the connecting component 2, and the rope clamp 6 is fixed on the bracket 4 at a position close to the driving mechanism 1; the rope clamp 6 prevents the horizontal twisting of the multiple cables 5; an operating component 8 is provided on the bracket 4 at the upper limit position corresponding to the counterweight 3; the number of counterweight blocks 33 in the counterweight 3 is increased / decreased by the operating component 8.

[0020] The low-wear, high-stress-bearing 100-meter stroke pumping unit of the present invention is applied to offshore oil production platforms. Usually, the derrick of an offshore oil production platform is 50 to 100 meters above the water surface. After the cable 5 driving the sucker rod 9 passes around the driving wheel 11 at the top of the bracket 4, and then passes around the movable pulley 32 on the counterweight 3, it is connected to the fixed plate 46 at the top of the bracket 4. The counterweight 3 and the sucker rod 9 can achieve a transmission ratio of 1:2, so the sucker rod 9 can achieve a pumping stroke of at least 100 meters. The stroke of the 100-meter stroke pumping unit of the present invention can reach 50 to 100 meters, which can realize long siphoning of the formation and unblock the blockage in the formation; the 100-meter stroke pumping unit expands the suction area of ​​a single well, saves the overall cost, and reduces the wear of the equipment. In other embodiments, when the present invention is installed on land, a countersunk hole for accommodating the counterweight 3 and its guide rail is drilled at the side of the oil well to reduce the ground height of the equipment.

[0021] In the prior art, in order to achieve a long stroke of the pumping unit, the cable connected to the sucker rod is usually wound on a drum, and the drum has a spiral rope groove. In order to ensure that the rope outlet point on the drum remains unchanged, the drum needs to be translated during the process of the drum rotating and winding the cable. The above mechanism is complex to control and the cable is easily wound on the drum to cause friction between the cable and the rope groove, which aggravates the wear of the cable. The multiple rope grooves 111 provided on the driving wheel 11 of the present invention are independent closed annular rope grooves. Each cable 5 is hung in the rope groove 111 of the driving wheel 11. The gravity of the counterweight 3 and the static friction of the driving wheel 11 on the cable 5 are used to provide the driving force for driving the sucker rod 9 to rise and fall. Increasing the number of cables 5 can increase the static friction of the driving wheel 11 on the cable 5 to improve the driving force. Compared with the prior art, it has the advantages of energy saving and low wear.

[0022] The driving wheel 11 is provided with a plurality of annular rope grooves 111; the plurality of cables 5 are respectively arranged in the rope grooves 111, and the output end of the motor 12 is connected to the driving wheel 11 to drive the cables 5; the motor 12 is fixed on the top beam 42 at the top end of the column 41 of the bracket 4; the connecting assembly 2 is slidably arranged on the second guide rail 45 of the bracket 4, and the counterweight 3 is slidably arranged on the first guide rail 44 of the bracket 4; the first guide rail 44 and the second guide rail 45 are fixed to the column 41 of the bracket 4 through the cross frame 43.

[0023] The bracket 4 of the present invention is a frame structure composed of a column 41, a top beam 42, and a cross frame 43, which is convenient for connection and fixation with the derrick of an offshore oil production platform. The first guide rail 44 and the second guide rail 45 are respectively fixed on both sides of the column 41, wherein the second guide rail 45 limits and guides the connecting component 2 to prevent the cable 5 on the connecting component 2 from being tangled and interfering, and the first guide rail 44 guides the counterweight 3.

[0024] The rope clamp 6 is arranged on the bracket 4 below the top beam 42; the rope clamp 6 includes a bracket 61 and two clamping rollers 62 rotatably arranged on the bracket 61; a plurality of clamping grooves 620 are arranged on the clamping rollers 62; the clamping grooves 620 on the two clamping rollers 62 are closed to form a closed space, and the cable 5 passes through the closed space, and the closed space limits the lateral movement of the cable 5.

[0025] Specifically, the bracket 61 of the rope clamp 6 is fixedly connected to the crossbeam at the top of the column 41 of the bracket 4. When driving the sucker rod 9, the cable 5 will cause lateral shaking due to factors such as vibration and wind. Since the length of the pumping unit cable 5 with a stroke of 100 meters is relatively long, a smaller shaking may also cause the cable 5 and the rope groove 111 on the driving wheel 11 to be misaligned, resulting in rope skipping, rope tangling and other phenomena, causing sliding friction between the cable 5 and the rope groove 111, resulting in wear of the cable 5. The rope clamp 6 is arranged close to the driving wheel 11 to prevent the shaking on the cable 5 from being transmitted to the driving wheel 11.

[0026] The connecting assembly 2 includes a top plate 21 and a bottom plate 22 fixed to the lower end of the top plate 21; the top plate 21 is connected to the cables 5 through a plurality of fixing assemblies 7; the bottom plate 22 is fixedly connected to the sucker rod 9; sliders 23 are respectively provided on both sides of the top plate 21, and the sliders 23 are clamped with the second guide rail 45.

[0027] Specifically, the connection assembly 2 of the present invention can connect multiple cables 5 through the fixing assembly 7. The driving force (static friction force) that each cable 5 can provide with the driving wheel 11 is fixed. By increasing the number of cables 5 on the connection assembly 2, the driving force on the sucker rod 9 can be increased to meet the requirements of a long stroke. At the same time, a greater driving force can produce a better unblocking effect. In addition, the second guide rail 45 can limit the lateral movement of the connection assembly 2, prevent the multiple cables 5 on the connection assembly 2 from lateral shaking, and prevent the multiple cables 5 from lateral twisting.

[0028] The top plate 21 is provided with a plurality of fixing holes 210 ; one end of the fixing component 7 is fixedly connected to the cable 5 , and a connecting portion 713 at the other end of the fixing component 7 is fixedly connected to the fixing hole 210 ; the connecting portion and the fixing hole 210 are detachable structures.

[0029] On the connection component 2 of the present invention, multiple cables 5 can be fixed by a detachable structure. Since the driving force required by the pumping rod 9 changes dynamically during the life cycle of the oil field and is affected by multiple factors such as reservoir pressure, fluid properties, water content, wellbore conditions, equipment wear and production methods, the reservoir pressure gradually decreases as the production progresses, resulting in an increase in the force required for pumping oil to overcome a larger pressure difference; the viscosity of crude oil may increase due to a drop in temperature or gas precipitation, resulting in an increase in the resistance to pumping oil and requiring a greater force. According to the above situation, different numbers of cables 5 are set on the connection component 2 to meet different driving force requirements and improve the energy consumption ratio of the pumping equipment.

[0030] The fixing assembly 7 has a shell 71, and a connecting portion 713 is provided on a fixing rod 712 of the shell 71; a wedge block 73 is provided in the shell 71, and the wedge block 73 is sleeved with the sleeve portion 51 of the cable 5; the end 52 of the cable 5 is fixed by a clamping block 72; a cover plate 74 is provided on the shell 71 to abut the side of the wedge block 73.

[0031] One end of the wedge block 73 is a narrow end, and the other end is a wide end, and the narrow end faces the end 52 of the cable 5; the sleeve portion 51 of the cable 5 is sleeved in the limiting groove 731 of the wedge block 73; the shell 71 is provided with a wedge-shaped portion 711, and the wedge-shaped portion 711 cooperates with the wedge block 73 so that the pulling force of the cable 5 on the fixing component 7 causes the wedge block 73 to be displaced toward the narrow end of the wedge block 73 relative to the wedge-shaped portion 711; the wedge-shaped portion 711 of the shell 71 squeezes the sleeve portion 51 of the cable 5 in the limiting groove 731 of the wedge block 73, thereby generating a greater fastening force.

[0032] Specifically, Figure 5 As shown, the upper end of the wedge block 73 is a narrow end, the lower end of the wedge block 73 is a wide end, and the upper end of the wedge-shaped portion 711 of the housing 71 is a narrow end, and the lower end is a wide end, and is adapted to the wedge block 73. The limiting groove 731 of the wedge block 73 faces the wedge-shaped portion 711 of the housing 71, and the side of the wedge block 73 is abutted and limited by the cover plate 74. After the sleeve portion 51 of the cable 5 bypasses the limiting groove 731 of the wedge block 73, the end 52 of the cable 5 is fixed on the cable 5 through the clamping block 72. After the cable 5 applies an upward pulling force to the fixing assembly 7, the wedge block 73 generates an upward movement trend relative to the housing 71, so that the sleeve portion 51 of the cable 5 in the limiting groove 731 of the wedge block 73 is squeezed due to the narrowing of the upper wedge-shaped portion 711, so that the wedge-shaped portion 711 of the housing 71 generates a greater squeezing force / static friction force / fixing force on the cable 5.

[0033] The movable pulley 32 of the counterweight 3 is arranged at the top of the counterweight frame 31, and a plurality of annular rope grooves are arranged on the movable pulley 32; guide blocks 34 are respectively arranged at the upper and lower parts of both sides of the counterweight frame 31; the guide blocks 34 are slidably arranged on the first guide rail 44; the column of the counterweight frame 31 has two oppositely arranged flanges 311, and the two ends of the counterweight block 33 are respectively clamped between the two flanges 311; a plurality of counterweight blocks 33 are stacked and fixed in the counterweight frame 31, and a fixed pressure rod 35 is arranged on the counterweight block 33 at the top; an opening 312 for taking and placing the counterweight block 33 is arranged on the upper part of the flange 311 of the counterweight frame 31.

[0034] Specifically, the counterweight frame 31 of the present invention is a frame structure, including columns on both sides, a top beam and a bottom beam. The columns on both sides have convex edges 311 arranged opposite to each other, and the cross section of the columns is C-shaped. Figure 7 The counterweight block 33 is a square structure with protrusions on both sides. The protrusions on both sides of the counterweight block are clamped in the grooves of the C-shaped structure of the column of the counterweight frame 31. The bottom counterweight block 33 is placed on the bottom beam of the counterweight frame 31. The two ends of the fixed pressure rod 35 are fixed on the flange 311 of the column of the counterweight frame 31 by bolt fasteners, and the fixed pressure rod 35 can slide up and down after loosening the bolt fasteners. After stacking multiple counterweight blocks 33 on the counterweight frame 31, the fixed pressure rod 35 is installed on the top counterweight block 33 to fasten the counterweight block 33. The opening 312 at the top of the flange 311 can make the protrusions on both sides of the counterweight block 33 move horizontally and enter the groove of the C-shaped structure of the column of the counterweight frame 31 through the opening 312 when taking and placing the counterweight block 33. The counterweight block 33 is then placed down along the groove of the C-shaped structure and stacked on the bottom beam of the counterweight frame 31.

[0035] The operating component 8 includes a base 81 fixedly connected to the bracket 4, and a plurality of counterweights 33 are placed on the base 81 through a limit rod 85; a lift plate 82 that can be raised and lowered is provided on the base 81 through a plurality of guide pillars 821, and a lift cylinder 88 is provided between the middle part of the lift plate 82 and the base 81; a translatable bearing plate 83 is provided on the lift plate 82, and a translation cylinder 86 is provided between the bearing plate 83 and the lifting plate 82 to drive the bearing plate 83 to slide relative to the lifting plate 82; a retractable fork 84 is provided on the bearing plate 83, and a fork cylinder 87 is provided between the fork 84 and the bearing plate 83 to drive the fork 82 to retract; the fork 82 can be extended into the slot 331 of the counterweight 33 to take and place the counterweight 33 between the base 81 of the operating component 8 and the counterweight frame 31 of the counterweight 3.

[0036] Specifically, the base 81 includes an upper plate and a lower plate, a plurality of limit rods 85 are fixed on the upper plate of the base 81, and the counterweights 33 are stacked and placed on the upper plate of the base 81 through the limit rods 85; one end of the guide column 821 and the lifting cylinder 88 are fixed on the lower plate of the base 81, and the other end is connected to the lifting plate 82; a T-shaped slider and a T-shaped slide groove structure are arranged between the lifting plate 82 and the bearing plate 83, see the attached Fig.10 The lifting plate 82 is placed to be overturned by a T-shaped slider, the fork cylinder 87 is fixed on the door-shaped structure of the bearing plate 83, and a support rod is provided at the rear end of the fork 84, which is sleeved on the door-shaped structure of the bearing plate 83 to prevent the fork 84 from overturning.

[0037] After the counterweight 3 stops at the upper limit position of the bracket 4, the fork 84 extends into the slot 331 of the counterweight block 33 on the base 81; the counterweight block 33 is lifted and translated by the lifting plate 82, the load-bearing plate 83 and the fork 84, so that the counterweight block 33 passes through the opening 312 of the counterweight frame 31 and is stacked on the counterweight frame 31.

[0038] When the counterweight 33 of the present invention is operated, the counterweight 3 is first stopped at the upper limit position of the bracket 4, and then the fixed pressure rod 35 on the counterweight 3 is removed. First, the fork cylinder 87 drives the fork 84 to translate and insert the fork 84 into the slot 331 of the counterweight 33 on the base 81, and then the lifting cylinder 88 drives the lifting plate 82 to rise and make the counterweight 33 reach the height of the opening 312 of the counterweight frame 31 of the counterweight 3, and then the translation cylinder 86 drives the carrying plate 83 to drive the fork 84 and the counterweight 33 on the fork 84 to translate and enter the opening 312, and then the lifting cylinder 88 drives the lifting plate 82 to descend and place the counterweight 33 on the counterweight frame 31 of the counterweight 3. When the counterweight 33 is removed from the counterweight 3, the above-mentioned reverse operation is performed to move the counterweight 33 from the counterweight frame 31 to the base 81.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 100-meter stroke oil pumping unit with low wear and high stress bearing capacity, comprising an oil pumping rod (9) driven by a driving mechanism (1), characterized in that: The driving mechanism (1) is arranged at the top end of the bracket (4), and a plurality of cables (5) are mounted on a driving wheel (11) of the driving mechanism (1); One end of the cable (5) is connected to the connecting component (2) via a fixing component (7), and the connecting component (2) is connected to the sucker rod (9); Connecting a plurality of cables (5) to the sucker rod (9) via a connecting assembly (2) to increase the upper limit of the bearing force applied to the sucker rod (9); After the other end of the cable (5) passes around the movable pulley (32) of the counterweight (3), the end of the cable (5) is connected to the fixing plate (46) at the top of the bracket (4) through the fixing assembly (7); A rope clamp (6) is provided on the cable (5) between the driving mechanism (1) and the connecting assembly (2), and the rope clamp (6) is fixed on the bracket (4) at a position close to the driving mechanism (1); Preventing horizontal twisting of the plurality of cables (5) by means of the cable clamp (6); An operating assembly (8) is provided on the bracket (4) at an upper limit position corresponding to the counterweight (3); The number of the counterweight blocks (33) in the counterweight (3) is increased / decreased by the operating component (8).

2. The 100-meter stroke oil pumping unit according to claim 1, characterized in that: The driving wheel (11) is provided with a plurality of annular rope grooves (111); The plurality of cables (5) are respectively arranged in the rope grooves (111), and the output end of the motor (12) is connected to the driving wheel (11) to drive the cables (5); The motor (12) is fixed on a top beam (42) at the top end of a column (41) of the bracket (4); The connecting assembly (2) is slidably disposed on a second guide rail (45) of the bracket (4), and the counterweight (3) is slidably disposed on a first guide rail (44) of the bracket (4); The first guide rail (44) and the second guide rail (45) are fixed to the upright column (41) of the bracket (4) via a cross frame (43).

3. The 100-meter stroke oil pumping unit according to claim 2, characterized in that: The rope clamp (6) is arranged on a bracket (4) below the top beam (42); The rope clamp (6) comprises a bracket (61) and two clamping rollers (62) rotatably arranged on the bracket (61); The clamping roller (62) is provided with a plurality of clamping grooves (620); The clamping grooves (620) on the two clamping rollers (62) are closed to form a closed space, through which the cable (5) passes, and the closed space limits the lateral movement of the cable (5).

4. The 100-meter stroke oil pumping unit according to claim 3, characterized in that: The connecting assembly (2) comprises a top plate (21) and a bottom plate (22) fixed to the lower end of the top plate (21); The top plate (21) is respectively connected to the cables (5) via a plurality of fixing components (7); The bottom plate (22) is fixedly connected to the sucker rod (9); Slide blocks (23) are respectively provided on both sides of the top plate (21), and the slide blocks (23) are clamped with the second guide rails (45).

5. The 100-meter stroke oil pumping unit according to claim 4, characterized in that: The top plate (21) is provided with a plurality of fixing holes (210); One end of the fixing component (7) is fixedly connected to the cable (5), and the connecting portion (713) at the other end of the fixing component (7) is fixedly connected to the fixing hole (210); The connecting portion and the fixing hole (210) are detachable structures.

6. The 100-meter stroke oil pumping unit according to claim 5, characterized in that: The fixing assembly (7) comprises a housing (71), and a fixing rod (712) of the housing (71) comprises a connecting portion (713); A wedge block (73) is provided in the housing (71), and the wedge block (73) is sleeved with the sleeve connection portion (51) of the cable (5); The end (52) of the cable (5) is fixed by a clamp (72); The housing (71) is provided with a cover plate (74) to abut against the side surface of the wedge block (73).

7. The 100-meter stroke oil pumping unit according to claim 6, characterized in that: One end of the wedge (73) is a narrow end, and the other end is a wide end, and the narrow end faces the end (52) of the cable (5); The sleeve portion (51) of the cable (5) is sleeved in the limiting groove (731) of the wedge block (73); The housing (71) has a wedge-shaped portion (711), and the wedge-shaped portion (711) cooperates with the wedge block (73) so that: The pulling force of the cable (5) on the fixing assembly (7) causes the wedge block (73) to be displaced relative to the wedge-shaped portion (711) toward the narrow end of the wedge block (73); The wedge-shaped portion (711) of the housing (71) is pressed against the sleeve portion (51) of the cable (5) in the limiting groove (731) of the wedge block (73), thereby generating a greater tightening force.

8. The 100-meter stroke oil pumping unit according to claim 7, characterized in that: The movable pulley (32) of the counterweight (3) is arranged on the top of the counterweight frame (31), and a plurality of annular rope grooves are arranged on the movable pulley (32); The upper and lower parts of both sides of the counterweight frame (31) are respectively provided with guide blocks (34); The guide block (34) is slidably disposed on the first guide rail (44); The column of the counterweight frame (31) has two convex edges (311) arranged opposite to each other, and the two ends of the counterweight block (33) are respectively clamped between the two convex edges (311); A plurality of counterweight blocks (33) are stacked and fixed in the counterweight frame (31), and a fixed pressure rod (35) is provided on the top counterweight block (33); An opening (312) for taking in and placing a counterweight block (33) is provided at the upper portion of the convex edge (311) of the counterweight frame (31).

9. The 100-meter stroke oil pumping unit according to claim 8, characterized in that: The operating assembly (8) comprises a base (81) fixedly connected to the bracket (4), and a plurality of counterweights (33) are placed on the base (81) via a limiting rod (85); A lifting plate (82) that can be raised and lowered is disposed on the base (81) via a plurality of guide pillars (821), and a lifting cylinder (88) is disposed between the middle portion of the lifting plate (82) and the base (81); A load-bearing plate (83) that can be translated is disposed on the lifting plate (82), and a translation cylinder (86) is disposed between the load-bearing plate (83) and the lifting plate (82) to drive the load-bearing plate (83) to slide relative to the lifting plate (82); A retractable fork (84) is disposed on the carrying plate (83), and a fork cylinder (87) is disposed between the fork (84) and the carrying plate (83) to drive the fork (82) to retract; The fork (82) can extend into the slot (331) of the counterweight block (33) to perform a pick-up and place operation on the counterweight block (33) between the base (81) of the operating assembly (8) and the counterweight frame (31) of the counterweight (3).

10. The 100-meter stroke oil pumping unit according to claim 9, characterized in that: After the counterweight (3) stops at the upper limit position of the bracket (4), the fork (84) extends into the slot (331) of the counterweight block (33) on the base (81); The counterweight block (33) is lifted and translated by means of a lifting plate (82), a carrying plate (83) and a fork (84), so that the counterweight block (33) passes through an opening (312) of a counterweight frame (31) and is stacked and placed on the counterweight frame (31).

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