Pulley block hydraulic pumping unit

Abstract

The utility model relates to the technical field of pumping units, in particular to a pulley block hydraulic pumping unit which comprises a rack, an upper platform, a hydraulic cylinder, a first connecting rope, a second connecting rope and a beam hanger, and the upper side of the rack is fixedly provided with the upper platform. The well mouth polish rod lifting device is reasonable and compact in structure, when the hydraulic cylinder enables the first reversing pulley to move upwards, the well mouth polish rod achieves the ascending process, at the moment, the balance weight moves downwards, in the ascending process of the well mouth polish rod, the gravity of the balance weight and the hydraulic cylinder jointly bear the load for lifting the well mouth polish rod, the load of the hydraulic cylinder can be reduced, and the work efficiency is improved. When the hydraulic cylinder enables the first reversing pulley to move downwards, the wellhead polish rod pulls up the counterweight to an initial position through the first connecting rope, and the hydraulic cylinder enables the first reversing pulley to ascend and descend alternately, so that the wellhead polish rod ascends and descends alternately, and finally oil in a well is pumped to the ground. The balance effect is good, and the working efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of oil pumping unit technology, and is a pulley block hydraulic oil pumping unit. Background Technology

[0002] During heavy oil extraction, the high viscosity of crude oil generates significant frictional resistance. As the sucker rod descends, the viscous friction slows its descent, sometimes causing it to stop, resulting in a "donkey head fighting" situation that disrupts the balance of the traditional beam pumping unit. Conversely, as the sucker rod ascends, increased friction leads to a higher workload. Traditional beam pumping units employ a four-bar linkage, which has the following drawbacks: for long-stroke, high-load models, they are bulky, require large amounts of steel, and occupy a large area; stroke and stroke parameters are fixed and cannot be infinitely adjusted; they suffer from poor balancing, low efficiency, and high energy consumption, exhibiting problems such as "oversized motor for a small load"; furthermore, subsequent maintenance costs (motor, reducer, electrical control box) are high.

[0003] Furthermore, beam pumping units maintain constant up-and-down time and speed, failing to consider the impact of crude oil viscosity variations on the unit's operating conditions. When beam pumping units are used for heavy oil extraction, the sucker rod is often lifted before the head reaches the bottom dead center, resulting in low pump efficiency and high energy consumption during idling. With continuous breakthroughs in oil extraction technology, a series of new types of pumping units have been successfully developed. These new pumping units are technologically advanced, but their overall cost is high, and their use, maintenance, and upkeep are difficult, requiring specialized technical service teams. Their stroke length and stroke rate are not adjustable, and under the influence of downhole loads and viscosity variations, the lifting speed of the sucker rod cannot be adapted to the reservoir, thus failing to meet the pumping speed requirements of heavy oil, which is slower up and faster down. Summary of the Invention

[0004] This utility model provides a pulley block hydraulic pumping unit that overcomes the shortcomings of the prior art and can effectively solve the problems of high cost, difficulty in use, maintenance and upkeep of existing pumping units.

[0005] The technical solution of this utility model is achieved through the following measures: A pulley block hydraulic pumping unit includes a frame, an upper platform, a hydraulic cylinder, a first connecting rope, a second connecting rope, and a suspension device. An upper platform is fixedly installed on the upper side of the frame. A first left pulley and a second left pulley are spaced apart on the upper left side of the upper platform. A right pulley, corresponding to the first left pulley, is rotatably installed on the upper right side of the upper platform. A counterweight is located below the right side of the upper platform. The first end of the first connecting rope passes over the outer side of the right pulley and is fixedly connected to the upper side of the counterweight. The second end of the first connecting rope passes over the outer side of the left side of the first left pulley and is connected to a hydraulic cylinder located on the lower left side of the frame. The upper side of the suspension rope device is fixedly connected, and the lower part of the hydraulic cylinder is fixedly installed on the inner side of the lower part of the frame. The upper end of the piston rod of the hydraulic cylinder is rotatably mounted with a first reversing pulley. The upper side of the frame is provided with a second reversing pulley corresponding to the position between the right side of the second left pulley and the left side of the right pulley. The lower right side of the frame is rotatably mounted with a third reversing pulley corresponding to the position of the second reversing pulley. The first end of the second connecting rope passes over the upper outer side of the first reversing pulley and is fixedly connected to the lower part of the frame. The second end of the second connecting rope passes over the lower outer side of the third reversing pulley, the right outer side of the second reversing pulley, and the left outer side of the second left pulley in sequence and is fixedly connected to the upper side of the suspension rope device.

[0006] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0007] A lower platform can be fixedly installed on the lower side of the frame. The lower end of the hydraulic cylinder is fixedly installed together with the upper left side of the lower platform. The third reversing pulley is rotatably installed on the upper side of the lower platform to the right of the hydraulic cylinder. The first end of the second connecting rope passes around the upper outer side of the first reversing pulley and is fixedly connected to the upper part of the lower platform. A buffer pad is fixedly installed on the upper right side of the lower platform corresponding to the counterweight position.

[0008] The above may also include a directional valve, a base that is detachably and fixedly installed on the lower side of the lower platform, a hydraulic station on the right side of the base, the outlet and return port of the hydraulic station being connected to the first inlet and the first outlet of the directional valve respectively, a supply pipe being fixedly connected between the second outlet of the directional valve and the inlet of the hydraulic cylinder, and a return pipe being fixedly connected between the outlet of the hydraulic cylinder and the second inlet of the directional valve.

[0009] The upper end of the piston rod of the hydraulic cylinder can be fixedly mounted with a mounting bracket. The first reversing pulley is rotatably mounted on the lower part of the mounting bracket. A lower proximity switch is fixedly mounted on the inner side of the lower part of the frame corresponding to the position of the first reversing pulley. An upper proximity switch is detachably fixedly mounted on the inner side of the upper part of the frame corresponding to the position above the lower proximity switch. A control cabinet is mounted on the upper side of the hydraulic station. A controller is installed in the control cabinet. Both the lower and upper proximity switches are connected to the controller. The controller is connected to the reversing valve.

[0010] The upper part of the aforementioned mounting bracket is rotatably equipped with a first auxiliary pulley, the upper side of the upper platform corresponding to the position of the first auxiliary pulley is rotatably equipped with a second auxiliary pulley, and the upper right side of the upper platform corresponding to the position of the second auxiliary pulley is rotatably equipped with a third auxiliary pulley.

[0011] A solar power generation module can be installed on the right side of the aforementioned hydraulic station, and the solar power generation module is connected to the controller and the hydraulic station respectively.

[0012] A clearance mechanism may be provided between the base and the lower platform. The clearance mechanism includes a clearance screw and a screw nut. A screw nut is fixedly installed on the upper right side of the base corresponding to the right position of the lower platform. A clearance screw is screwed into the screw nut. The left end of the clearance screw is rotatably installed together with the right side of the lower platform.

[0013] The upper front part of the base corresponding to the front position of the lower platform has several front limit seats fixedly installed at intervals on the left and right. Each front limit seat has a front set screw screwed to its upper part, which contacts the front side of the lower platform. The upper rear part of the base corresponding to the rear position of the lower platform has several rear limit seats fixedly installed at intervals on the left and right. Each rear limit seat has a rear set screw screwed to its upper part, which contacts the rear side of the lower platform.

[0014] The lower platform can be equipped with several adjusting screws at intervals on both the front and rear sides, and each adjusting screw has a roller mounted on its lower end.

[0015] This utility model has a reasonable and compact structure. In use, the upper part of the wellhead polished rod is fixedly installed together with the suspension rope device. The first end of the first connecting rope is fixedly connected to the upper side of the counterweight. The second end of the first connecting rope is connected to the upper part of the wellhead polished rod via the suspension rope device. The first end of the second connecting rope is fixedly connected to the lower part of the frame, fixing the frame beside the wellhead. The second end of the second connecting rope is connected to the upper part of the wellhead polished rod via the suspension rope device. When the hydraulic cylinder causes the first reversing pulley to move upward, the second end of the second connecting rope drives the suspension rope device to move upward, thus enabling the wellhead polished rod to move upward. At this time, the counterweight moves downward, and the weight of the counterweight... Force is applied to the wellhead polished rod through the first connecting rope. During the upward movement of the wellhead polished rod, the weight of the counterweight and the hydraulic cylinder jointly bear the load of lifting the wellhead polished rod, reducing the load on the hydraulic cylinder. When the hydraulic cylinder causes the first reversing pulley to move downward, the wellhead polished rod descends under gravity. At this time, the wellhead polished rod pulls the counterweight back to its initial position through the first connecting rope. This process repeats, with the hydraulic cylinder causing the first reversing pulley to rise and fall alternately, thus causing the wellhead polished rod to move up and down alternately, ultimately pumping the oil from the well to the surface. This method has the advantages of small footprint, simple operation, good balance, and high working efficiency. Attached Figure Description

[0016] Appendix Figure 1 These are schematic diagrams of the main structure of embodiments one through nine of this utility model.

[0017] Appendix Figure 2 This is a right-side view of the frame structure in embodiments one through nine of this utility model.

[0018] Appendix Figure 3 This is a left-side view of the frame structure in embodiments one through nine of this utility model.

[0019] Appendix Figure 4 This is a top view of the upper platform in embodiments one through nine of this utility model.

[0020] Appendix Figure 5 This is a schematic diagram of the structure of the first connecting rope and the second connecting rope during installation in embodiments one to nine of this utility model.

[0021] Appendix Figure 6 This is a schematic diagram of the circuit structure of embodiments four to nine of this utility model.

[0022] The codes in the attached diagram are as follows: 1 for frame, 2 for upper platform, 3 for hydraulic cylinder, 4 for first connecting rope, 5 for second connecting rope, 6 for suspension device, 7 for first left pulley, 8 for second left pulley, 9 for right pulley, 10 for first reversing pulley, 11 for second reversing pulley, 12 for third reversing pulley, 13 for lower platform, 14 for buffer pad, 15 for reversing valve, 16 for base, 17 for hydraulic station, 18 for oil supply pipe, 19 for oil return pipe, and 20 for mounting bracket. 21 is the lower proximity switch, 22 is the upper proximity switch, 23 is the control cabinet, 24 is the controller, 25 is the first auxiliary pulley, 26 is the second auxiliary pulley, 27 is the third auxiliary pulley, 28 is the solar power generation component, 29 is the clearance screw, 30 is the screw nut, 31 is the front limit seat, 32 is the front set screw, 33 is the rear limit seat, 34 is the rear set screw, 35 is the adjusting screw, 36 is the roller, 37 is the counterweight, 38 is the wellhead polished rod, and 39 is the auxiliary connecting rope. Detailed Implementation

[0023] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0024] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0025] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0026] Example 1: As shown in the attached document Figures 1 to 5As shown, the pulley block hydraulic pumping unit includes a frame 1, an upper platform 2, a hydraulic cylinder 3, a first connecting rope 4, a second connecting rope 5, and a suspension rope device 6. The upper platform 2 is fixedly installed on the upper side of the frame 1. A first left pulley 7 and a second left pulley 8 are spaced apart on the upper left side of the upper platform 2. A right pulley 9, corresponding to the first left pulley 7, is rotatably installed on the upper right side of the upper platform 2. A counterweight 37 is located below the right side of the upper platform 2. The first end of the first connecting rope 4 passes over the outer right side of the right pulley 9 and is fixedly connected to the upper side of the counterweight 37. The second end of the first connecting rope 4 passes over the outer left side of the first left pulley 7 and is fixedly connected to the upper side of the suspension rope device 6 located on the lower left side of the frame 1. The lower part of the pressure cylinder 3 is fixedly installed on the inner side of the lower part of the frame 1. The upper end of the piston rod of the hydraulic cylinder 3 is rotatably mounted with the first reversing pulley 10. The upper side of the frame 1, corresponding to the position between the right side of the second left pulley 8 and the left side of the right pulley 9, is provided with the second reversing pulley 11. The lower right side of the frame 1, corresponding to the position of the second reversing pulley 11, is rotatably mounted with the third reversing pulley 12. The first end of the second connecting rope 5 passes over the upper outer side of the first reversing pulley 10 and is fixedly connected to the lower part of the frame 1. The second end of the second connecting rope 5 passes over the lower outer side of the third reversing pulley 12, the right outer side of the second reversing pulley 11, and the left outer side of the second left pulley 8 in sequence and is fixedly connected to the upper side of the suspension rope device 6.

[0027] According to the requirements, the first left pulley 7, the right pulley 9, and the first connecting rope 4 are arranged in a one-to-one correspondence. At least one first left pulley 7 is rotatably mounted on the upper left side of the upper platform 2 through a pair of bearing seats. In this embodiment, there are two first left pulleys 7. Each first left pulley 7 and the right pulley 9 are provided with rope grooves on their outer sides. The second left pulley 8, the first reversing pulley 10, the second reversing pulley 11, the third reversing pulley 12, and the second connecting rope 5 are arranged in a one-to-one correspondence. At least one first reversing pulley 10 is rotatably mounted together with the upper part of the piston rod of the hydraulic cylinder 3. In this embodiment, there are two first reversing pulleys 10. Each first reversing pulley 10 is provided with rope grooves on its outer side. The first connecting rope 4 and the second connecting rope 5 are both existing known steel wire ropes. The rope suspension device 6 is existing known technology. The distance between the two first connecting ropes 4 is greater than the distance between the two second connecting ropes 5. The two first left pulleys 7 are arranged with a front-to-back interval. The two second left pulleys 8 are arranged with a front-to-back interval between the two first left pulleys 7 on the upper left side of the upper platform 2, which can reduce the footprint.

[0028] In use, the upper part of the wellhead polished rod 38 is fixedly installed together with the suspension rope device 6. The first end of the first connecting rope 4 is fixedly connected to the upper side of the counterweight 37. The second end of the first connecting rope 4 is connected to the upper part of the wellhead polished rod 38 through the suspension rope device 6. The first end of the second connecting rope 5 is fixedly connected to the lower part of the frame 1. The frame 1 is fixed next to the wellhead. The second end of the second connecting rope 5 is connected to the upper part of the wellhead polished rod 38 through the suspension rope device 6. When the hydraulic cylinder 3 causes the first reversing pulley 10 to move upward, the second end of the second connecting rope 5 drives the suspension rope device 6 to move upward, thereby enabling the wellhead polished rod 38 to move upward. At this time, the counterweight 37 moves downward, and the gravity of the counterweight 37 passes through the first reversing pulley 10. The connecting rope 4 acts on the wellhead polished rod 38. During the upward movement of the wellhead polished rod 38, the weight of the counterweight 37 and the hydraulic cylinder 3 jointly bear the load of lifting the wellhead polished rod 38, which can reduce the load on the hydraulic cylinder 3. When the hydraulic cylinder 3 causes the first reversing pulley 10 to move downward, the wellhead polished rod 38 moves downward under the action of gravity. At this time, the wellhead polished rod 38 pulls the counterweight 37 back to the initial position through the first connecting rope 4. This process is repeated, and the hydraulic cylinder 3 causes the first reversing pulley 10 to rise and fall alternately, so that the wellhead polished rod 38 moves up and down alternately, eventually pumping the oil in the well to the surface. It has the advantages of small footprint, simple operation, good balance effect and high working efficiency.

[0029] The above-mentioned pulley block hydraulic pumping unit can be further optimized and / or improved according to actual needs:

[0030] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 4, a lower platform 13 is fixedly installed on the lower side of the frame 1. The lower end of the hydraulic cylinder 3 is fixedly installed together with the upper left side of the lower platform 13. The third reversing pulley 12 is rotatably installed on the upper side of the lower platform 13 to the right of the hydraulic cylinder 3. The first end of the second connecting rope 5 passes over the upper outer side of the first reversing pulley 10 and is fixedly connected to the upper part of the lower platform 13. A buffer pad 14 is fixedly installed on the upper right side of the lower platform 13 corresponding to the position of the counterweight 37.

[0031] As required, the buffer pad 14 is located in the vertical projection area of ​​the counterweight 37 on the lower platform 13. In the event of a loss of control of the hydraulic cylinder 3 or a breakage of the first connecting rope 4, it can protect the pumping unit. During use, the lower platform 13 increases the lower area of ​​the frame 1, which not only improves the stability of the frame 1, but also facilitates the installation of the hydraulic cylinder 3, the third reversing pulley 12, and the first end of the second connecting rope 5.

[0032] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, it also includes a reversing valve 15. A base 16 is detachably and fixedly installed on the lower side of the lower platform 13. A hydraulic station 17 is provided on the right side of the base 16. The outlet and return port of the hydraulic station 17 are respectively connected to the first inlet and the first outlet of the reversing valve 15. An oil supply pipe 18 is fixedly connected between the second outlet of the reversing valve 15 and the inlet of the hydraulic cylinder 3. An oil return pipe 19 is fixedly connected between the outlet of the hydraulic cylinder 3 and the second inlet of the reversing valve 15.

[0033] Depending on the requirements, the hydraulic station 17 is a known technology, such as the GLD dual-motor hydraulic station, or an energy-saving variable frequency hydraulic station described in the patent document with publication number CN110425199A, or the LXBZ series hydraulic pump station, or the DSQ6 / 50H-B electric oil pump. The hydraulic cylinder 3 is a known technology, such as a double-acting hydraulic cylinder. The directional valve 15 is a known technology, such as a manual directional valve or a solenoid directional valve.

[0034] During operation, the hydraulic station 17 continuously pumps hydraulic oil into the rodless chamber of the hydraulic cylinder 3 through the oil supply pipe 18. The hydraulic oil acts on the piston, discharging the hydraulic oil in the rod chamber to the hydraulic oil tank of the hydraulic station 17. Simultaneously, the piston rod of the lifting hydraulic cylinder 3 extends, ultimately causing the first reversing pulley 10 to move upward. When the first reversing pulley 10 moves upward, the second end of the second connecting rope 5 drives the suspension rope 6 to move upward, thereby enabling the wellhead polished rod 38 to move upward. At this time, the counterweight 37 moves downward, and the weight of the counterweight 37 acts on the wellhead polished rod 38 through the first connecting rope 4. Thus, during the upward movement of the wellhead polished rod 38, the weight of the counterweight 37 and the hydraulic cylinder 3 jointly bear the load of lifting the wellhead polished rod 38, which can reduce the load on the hydraulic cylinder 3.

[0035] When the suspension rope 6 raises the wellhead polished rod 38 to a certain height, the hydraulic station 17 continuously pumps hydraulic oil into the rod chamber of the hydraulic cylinder 3 through the return oil pipe 19 via the reversing valve 15. The hydraulic oil acts on the piston, discharging the hydraulic oil in the rodless chamber to the hydraulic oil tank of the hydraulic station 17. At the same time, the piston rod of the hydraulic cylinder 3 retracts, causing the first reversing pulley 10 to move downward. When the first reversing pulley 10 moves downward, the wellhead polished rod 38 descends under the action of gravity. At this time, the wellhead polished rod 38 pulls the counterweight 37 to the initial position through the first connecting rope 4.

[0036] When the suspension cable 6 and the wellhead polished rod 38 descend to a certain position, the hydraulic station 17 continuously pumps hydraulic oil through the supply pipe 18 into the rodless chamber of the hydraulic cylinder 3 via the reversing valve 15, causing the wellhead polished rod 38 to move upward. This process is repeated, with the hydraulic station 17 alternately pumping hydraulic oil into the supply pipe 18 and the return pipe 19, causing the first reversing pulley 10 to rise and fall alternately, thereby causing the wellhead polished rod 38 to move upward and downward alternately, ultimately pumping the oil from the well to the surface.

[0037] To meet the requirement of a slow upward and fast downward pumping speed when extracting heavy oil, hydraulic cylinder 3 can be a single-rod double-acting cylinder. The cross-sectional area of ​​the rodless chamber of hydraulic cylinder 3 is larger than that of the rod chamber (because the piston rod has a certain cross-sectional area, the cross-sectional areas on both sides of the piston are different). In this way, when the hydraulic station 17 keeps the fluid supply constant, the larger the cross-sectional area acting on the piston, the slower the piston moves. When the piston rod moves upward, the hydraulic oil does work in the rodless chamber, and when the piston rod moves downward, the hydraulic oil does work in the rod chamber, thereby achieving the requirement of a slow upward and fast downward pumping speed of the wellhead rod 38, which meets the needs of heavy oil extraction speed.

[0038] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 6 As shown, a mounting bracket 20 is fixedly installed on the upper end of the piston rod of the hydraulic cylinder 3. The first reversing pulley 10 is rotatably installed on the lower part of the mounting bracket 20. A lower proximity switch 21 is fixedly installed on the inner side of the lower part of the frame 1 corresponding to the position of the first reversing pulley 10. An upper proximity switch 22 is detachably fixedly installed on the inner side of the upper part of the frame 1 corresponding to the position above the lower proximity switch 21. A control cabinet 23 is installed on the upper side of the hydraulic station 17. A controller 24 is installed inside the control cabinet 23. Both the lower proximity switch 21 and the upper proximity switch 22 are connected to the controller 24. The controller 24 is connected to the reversing valve 15.

[0039] Depending on the requirements, the reversing valve 15 is a known electromagnetic reversing valve, such as the 4WE10 series three-position four-way electromagnetic reversing valve. The controller 24 is a known technology, such as a PLC control module, a WYS-2-W displacement transmitter controller 24, or an XSAW displacement display controller. The upper proximity switch 22 and the lower proximity switch 21 have the same structure and are both known technologies, such as inductive proximity switches or capacitive proximity switches. The upper proximity switch 22 can be adjusted in its mounting position on the frame 1 according to the stroke. The mounting bracket 20 can be a H-shaped frame or an I-shaped frame.

[0040] When the valve core of the directional valve 15 is in the neutral position, the first inlet (P port), the first outlet (T port), the second inlet (A port), and the second outlet (B port) of the directional valve 15 are not connected to each other, so the position of the piston rod of the hydraulic cylinder 3 remains unchanged.

[0041] When operation begins, controller 24 switches the spool of directional valve 15 to the left position. At this time, the P port (first inlet) of directional valve 15 is connected to the outlet of hydraulic station 17, the T port (first outlet) of directional valve 15 is connected to the return port (hydraulic oil tank) of hydraulic station 17, the A port (second inlet) of directional valve 15 is connected to the inlet (rodless chamber) of hydraulic cylinder 3, and the B port (second outlet) of directional valve 15 is connected to the outlet (rod chamber) of hydraulic cylinder 3. Port P is connected to port A, and port B of directional valve 15 is connected to port T. When hydraulic station 17 is working, hydraulic oil is pumped into port P of directional valve 15, and then flows from port A of directional valve 15 into the rodless chamber of hydraulic cylinder 3, thereby causing the upper end of piston rod of hydraulic cylinder 3 to extend upward. At this time, the hydraulic oil in the rod chamber of hydraulic cylinder 3 flows back to the hydraulic oil tank of hydraulic station 17 through port B and port T of directional valve 15, thereby enabling the wellhead polished rod 38 to move upward.

[0042] When the upper proximity switch 22 detects that the first reversing pulley 10 has moved upward to the first set height, the upper proximity switch 22 sends a signal to the controller 24. After receiving the signal, the controller 24 causes the valve core of the reversing valve 15 to switch to the right position. At this time, the P port of the reversing valve 15 is connected to the outlet of the hydraulic station 17, the T port of the reversing valve 15 is connected to the return port (hydraulic oil tank) of the hydraulic station 17, the A port of the reversing valve 15 is connected to the rodless chamber of the hydraulic cylinder 3, the B port of the reversing valve 15 is connected to the rod chamber of the hydraulic cylinder 3, the P port of the reversing valve 15 is connected to the B port, and the A port of the reversing valve 15 is connected to the T port. When the hydraulic station 17 is working, it pumps hydraulic oil into the reversing valve. The oil flows from port P of directional valve 15 to port B of directional valve 15 into the rod chamber of hydraulic cylinder 3, causing the upper end of the piston rod of hydraulic cylinder 3 to retract downwards. At this time, the hydraulic oil in the rodless chamber of hydraulic cylinder 3 flows back to the hydraulic oil tank of hydraulic station 17 through port A and port T of directional valve 15, thereby enabling the wellhead polished rod 38 to move downwards. When the lower proximity switch 21 detects that the first directional pulley 10 has moved downwards to the second set height, the lower proximity switch 21 sends a signal to the controller 24. After receiving the signal, the controller 24 causes the valve core of directional valve 15 to switch to the left position again, enabling the wellhead polished rod 38 to move upwards again.

[0043] The first reversing pulley 10 reciprocates between the first set height and the second set height. The upper proximity switch 22 and the lower proximity switch 21 continuously send signals to the controller 24. The controller 24 causes the valve core of the reversing valve 15 to repeatedly reverse, causing the piston rod of the hydraulic cylinder 3 to extend and retract alternately, and causing the wellhead polished rod 38 to move up and down alternately, thereby realizing the oil pumping operation.

[0044] To facilitate the adjustment of the upper proximity switch 22 and the lower proximity switch 21, a scale is installed inside the frame 1. The upper proximity switch 22 and the lower proximity switch 21 are detachably and fixedly installed on the scale. In this way, by adjusting the position of the upper proximity switch 22 and the lower proximity switch 21, the stroke of the pulley block hydraulic pumping unit can be infinitely adjusted.

[0045] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 4 and 5, a first auxiliary pulley 25 is rotatably mounted on the upper part of the mounting bracket 20, a second auxiliary pulley 26 is rotatably mounted on the upper side of the upper platform 2 corresponding to the position of the first auxiliary pulley 25, and a third auxiliary pulley 27 is rotatably mounted on the upper right side of the upper platform 2 corresponding to the position of the second auxiliary pulley 26.

[0046] As required, the third auxiliary pulley 27 is rotatably installed on the upper right side of the upper platform 2 between the two right pulleys 9. During maintenance or installation of the counterweight 37, to smoothly lift the counterweight 37 to a certain height, the first auxiliary pulley 25, the second auxiliary pulley 26, and the third auxiliary pulley 27 are used. When the piston rod of the hydraulic cylinder 3 is not extended, the first end of an auxiliary connecting rope 39 is wrapped around the lower outer side of the first reversing pulley 10 and fixedly connected to the upper platform 2. The second end of the auxiliary connecting rope 39 is wrapped around the left outer side of the second auxiliary pulley 26 and the right outer side of the second auxiliary pulley 26 in sequence and then hangs down naturally. The controller 24 causes the piston rod of the hydraulic cylinder 3 to extend to a set height and then stop. The second end of the auxiliary connecting rope 39 is then... The second end of the first connecting rope 4 is simultaneously fixedly connected to the counterweight 37 on the upper side of the buffer pad 14. The first end of the first connecting rope 4 is passed around the outer right side of the right pulley 9 and the outer left side of the first left pulley 7 and hangs down naturally. The piston rod of the hydraulic cylinder 3 is retracted to the initial position and then stopped by the controller 24. In this way, the counterweight 37 is raised to the set height by the hydraulic cylinder 3. Then the first end of the first connecting rope 4 is connected to the suspension rope device 6. Then the counterweight 37 is lowered by the controller 24. The installation of the counterweight 37 can be achieved by removing the auxiliary connecting rope 39. In the later wellhead maintenance, after the suspension rope device 6 is disengaged from the wellhead polished rod 38, the pumping unit can be hung up by the hydraulic cylinder 3, thereby reducing the use of lifting machinery, reducing the shift cost, and improving economic efficiency.

[0047] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 6 As shown, a solar power generation module 28 is provided on the right side of the hydraulic station 17. The solar power generation module 28 is connected to the controller 24 and the hydraulic station 17 respectively.

[0048] Depending on the requirements, the solar power generation module 28 can be a known technology, such as a solar panel and a battery connected together, or a known wind turbine can be installed on the right side of the hydraulic station 17. During use, the solar power generation module 28 converts solar energy into electrical energy, which is then stored and released to power the hydraulic pumping unit for oil pumping, achieving energy-saving effects.

[0049] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 , 4 As shown, a clearance mechanism is provided between the base 16 and the lower platform 13. The clearance mechanism includes a clearance screw 29 and a screw nut 30. The screw nut 30 is fixedly installed on the upper right side of the base 16 corresponding to the right position of the lower platform 13. The clearance screw 29 is screwed into the screw nut 30. The left end of the clearance screw 29 is rotatably installed together with the right side of the lower platform 13.

[0050] According to the requirements, the clearance screw 29 is a known existing technology, such as a trapezoidal clearance screw. The right end of the clearance screw 29 has a square structure and a handwheel is fixedly installed on the right end of the clearance screw 29 to facilitate rotation. When it is necessary to stop oil pumping for well workover, the suspension rope 6 is separated from the wellhead polished rod 38, and the lower platform 13 is separated from the base 16. After rotating the clearance screw 29, the lower platform 13 and the frame 1 are moved to the right to realize the clearance function. After the well workover is completed, the clearance screw 29 is rotated in the opposite direction, so that the lower platform 13 and the frame 1 are moved to the left and returned to the initial position. The suspension rope 6 is fixedly installed with the wellhead polished rod 38, and oil pumping can begin.

[0051] Example 8: As an optimization of the above examples, as shown in the appendix Figures 1 to 4 As shown, several front limit seats 31 are fixedly installed on the upper front side of the base 16 corresponding to the front position of the lower platform 13 at intervals. Each front limit seat 31 is screwed with a front set screw 32 whose rear end contacts the front side of the lower platform 13. Similarly, several rear limit seats 33 are fixedly installed on the upper rear side of the base 16 corresponding to the rear position of the lower platform 13 at intervals. Each rear limit seat 33 is screwed with a rear set screw 34 whose front end contacts the rear side of the lower platform 13.

[0052] Depending on the requirements, the base 16 can be a concrete foundation. Two front limit seats 31 are fixedly installed at intervals on the upper front side of the base 16 corresponding to the position in front of the lower platform 13. Two rear limit seats 33 are fixedly installed at intervals on the upper rear side of the base 16 corresponding to the position behind the base 16. The front limit seats 31 and the rear limit seats 33 can be set one-to-one. In this way, when installing the lower platform 13, the position of the lower platform 13 can be adjusted by adjusting the length of the front set screw 32 and the rear set screw 34, thereby adjusting the alignment of the suspension rope device 6 with the wellhead. When the suspension rope device 6 is aligned with the wellhead, the lower platform 13 and the base 16 can be detachably and fixedly installed together by existing known connecting bolts.

[0053] Example 9: As an optimization of the above examples, as shown in the appendix Figures 1 to 4 As shown, several adjusting screws 35 are screwed to the front and rear of the lower platform 13 at intervals on the left and right, and each adjusting screw 35 has a roller 36 rotatably mounted at its lower end.

[0054] According to the requirements, the rollers 36 are existing known technologies, such as casters with brakes. Each adjusting screw 35 can be screwed to the upper outer side of the lower platform 13 with a locking nut, which can lock the adjusting screw 35. The base 16 is a concrete foundation. Two steel plates are pre-embedded on the upper front and upper rear sides of the base 16. The rollers 36 are located on the steel plates. When the pumping unit needs to move, the adjusting screw 35 is rotated so that the rollers 36 contact the upper side of the corresponding steel plate. By adjusting the front set screw 32 and the rear set screw 34, the rollers 36 are always located on the upper side of the corresponding steel plate, which reduces friction during the left and right movement of the lower platform 13 and the frame 1. Only a small force is needed to move the pumping unit.

[0055] During the well repair and relocation process of the pumping unit, the gap between the lower platform 13 and the end of the top screw is adjusted to 3-5mm. The contact area between the roller 36 and the steel plate is increased by adjusting the screw 35. With the assistance of the relocation mechanism, the hydraulic pumping unit of the pulley block is moved to the right to relocate. During the relocation, the counterweight 37 has been lowered and sits on the buffer pad 14. Due to the downward shift of the center of gravity of the whole machine and the buffering effect, the safety of the whole machine relocation is improved.

[0056] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A pulley block hydraulic pumping unit, characterized in that... The system includes a frame, an upper platform, a hydraulic cylinder, a first connecting rope, a second connecting rope, and a suspension device. The upper platform is fixedly mounted on the upper side of the frame. A first left pulley and a second left pulley are spaced apart on the upper left side of the upper platform. A right pulley, corresponding to the first left pulley, is rotatably mounted on the upper right side of the upper platform. A counterweight is located below the right side of the upper platform. The first end of the first connecting rope passes over the outer right side of the right pulley and is fixedly connected to the upper side of the counterweight. The second end of the first connecting rope passes over the outer left side of the first left pulley and is fixedly connected to the upper side of the suspension device located on the lower left side of the frame. The lower part of the hydraulic cylinder is fixed... Installed on the inner side of the lower part of the frame, the upper end of the piston rod of the hydraulic cylinder is rotatably mounted with a first reversing pulley. A second reversing pulley is provided on the upper side of the frame corresponding to the position between the right side of the second left pulley and the left side of the right pulley. A third reversing pulley is rotatably mounted on the right side of the lower part of the frame corresponding to the position of the second reversing pulley. The first end of the second connecting rope passes over the outer side of the upper part of the first reversing pulley and is fixedly connected to the lower part of the frame. The second end of the second connecting rope passes over the outer side of the lower part of the third reversing pulley, the outer side of the right part of the second reversing pulley, and the outer side of the left part of the second left pulley in sequence and is fixedly connected to the upper side of the suspension rope device.

2. The pulley block hydraulic pumping unit according to claim 1, characterized in that... A lower platform is fixedly installed on the lower side of the frame. The lower end of the hydraulic cylinder is fixedly installed together with the upper left side of the lower platform. The third reversing pulley is rotatably installed on the upper side of the lower platform to the right of the hydraulic cylinder. The first end of the second connecting rope passes around the upper outer side of the first reversing pulley and is fixedly connected to the upper part of the lower platform. A buffer pad is fixedly installed on the upper right side of the lower platform corresponding to the counterweight position.

3. The pulley block hydraulic pumping unit according to claim 2, characterized in that... It also includes a directional valve. A base is detachably and fixedly installed on the lower side of the platform. A hydraulic station is provided on the right side of the base. The outlet and return port of the hydraulic station are connected to the first inlet and the first outlet of the directional valve, respectively. A supply pipe is fixedly connected between the second outlet of the directional valve and the inlet of the hydraulic cylinder. A return pipe is fixedly connected between the outlet of the hydraulic cylinder and the second inlet of the directional valve.

4. The pulley block hydraulic pumping unit according to claim 3, characterized in that... A mounting bracket is fixedly installed on the upper end of the piston rod of the hydraulic cylinder. The first reversing pulley is rotatably installed on the lower part of the mounting bracket. A lower proximity switch is fixedly installed on the inner side of the lower part of the frame corresponding to the position of the first reversing pulley. An upper proximity switch is detachably fixedly installed on the inner side of the upper part of the frame corresponding to the position above the lower proximity switch. A control cabinet is installed on the upper side of the hydraulic station. A controller is installed in the control cabinet. Both the lower and upper proximity switches are connected to the controller. The controller is connected to the reversing valve.

5. The pulley block hydraulic pumping unit according to claim 4, characterized in that... A first auxiliary pulley is rotatably mounted on the upper part of the mounting frame, a second auxiliary pulley is rotatably mounted on the upper side of the upper platform corresponding to the position of the first auxiliary pulley, and a third auxiliary pulley is rotatably mounted on the upper right side of the upper platform corresponding to the position of the second auxiliary pulley; or / and, a solar power generation component is provided on the right side of the hydraulic station, and the solar power generation component is connected to the controller and the hydraulic station respectively.

6. The pulley block hydraulic pumping unit according to claim 3, 4, or 5, characterized in that... A clearance mechanism is provided between the base and the lower platform. The clearance mechanism includes a clearance screw and a screw nut. A screw nut is fixedly installed on the upper right side of the base corresponding to the right position of the lower platform. A clearance screw is screwed into the screw nut. The left end of the clearance screw is rotatably installed together with the right side of the lower platform.

7. The pulley block hydraulic pumping unit according to claim 3, 4, or 5, characterized in that... Several front limit seats are fixedly installed at intervals on the upper front side of the base corresponding to the front position of the lower platform. Each front limit seat is screwed with a front set screw that contacts the front side of the lower platform at its rear end. Several rear limit seats are fixedly installed at intervals on the upper rear side of the base corresponding to the rear position of the lower platform. Each rear limit seat is screwed with a rear set screw that contacts the rear side of the lower platform at its front end.

8. The pulley block hydraulic pumping unit according to claim 6, characterized in that... Several front limit seats are fixedly installed at intervals on the upper front side of the base corresponding to the front position of the lower platform. Each front limit seat is screwed with a front set screw that contacts the front side of the lower platform at its rear end. Several rear limit seats are fixedly installed at intervals on the upper rear side of the base corresponding to the rear position of the lower platform. Each rear limit seat is screwed with a rear set screw that contacts the rear side of the lower platform at its front end.

9. The pulley block hydraulic pumping unit according to claim 3, 4, 5, or 8, characterized in that... The lower platform has several adjusting screws screwed at intervals on both the front and rear sides, and each adjusting screw has a roller mounted on its lower end.

10. The pulley block hydraulic pumping unit according to claim 6, characterized in that... The lower platform has several adjusting screws screwed at intervals on both the front and rear sides, and each adjusting screw has a roller mounted on its lower end.

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