Pulley jacking type hydraulic pumping unit

Abstract

The utility model relates to the technical field of oil pumping units, in particular to a pulley jacking type hydraulic oil pumping unit which comprises a lower platform, a left pulley, a right pulley, a jacking pulley, a jacking mechanism, a first connecting rope, a second connecting rope, a beam hanger and a balance weight. The well mouth polish rod lifting device is reasonable and compact in structure, when the well mouth polish rod lifting device is used, the upper portion of a well mouth polish rod and a beam hanger are fixedly installed together, when the jacking mechanism enables the jacking pulley to move upwards, the well mouth polish rod achieves the ascending process, and in the ascending process of the well mouth polish rod, the gravity of the jacking mechanism and the gravity of the balance weight jointly bear loads for lifting the well mouth polish rod. The load of the jacking mechanism can be reduced, when the jacking mechanism enables the jacking pulley to move downwards, the well mouth polish rod pulls the balance weight to the initial position through the first connecting rope at the moment, and the process is repeated, so that the well mouth polish rod achieves the ascending and descending processes, oil liquid in a well is pumped to the ground finally, and the device has the advantages of being small in occupied area, easy to operate, good in balancing effect and high in reliability. And the working efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil pumping unit technical field, is a pulley jacking type hydraulic oil pumping unit. BACKGROUND

[0002] At present, in the crude oil surface mining equipment, beam pumping unit still occupies the dominant position, it has simple structure, reliable and durable characteristics, but also has a variety of defects: for long stroke, large load machine type, its volume and steel consumption amount is large, covers an area big;Stroke, the number of times parameters are relatively fixed, cannot stepless regulation;Balance effect is poor, low working efficiency, high energy consumption, there are 'big horse pulls small car' and other problems;In addition, the later (motor, reducer, distribution box) maintenance cost is high. The traditional beam pumping unit adopts four-bar linkage mechanism, its uplink and downlink time, speed keeps constant, does not consider the influence of crude oil viscosity variation on the operation condition of pumping unit, pumping unit pump efficiency is low, and the energy consumption of idling is high.

[0003] In addition, in the thickened oil exploitation process, due to the large viscosity of crude oil, the generated frictional resistance is very large. When the sucker rod is downlink, the viscous friction force makes its downlink speed slow down, and even stagnate, while the horse head and the suspension rope device continue to move downward, at this time, the suspension rope will be separated from the wellhead slickline, and the balance state of the original beam pumping unit is broken. When the sucker rod is uplink, the friction force intensifies and the working load increases. The pumping unit does not submerge to the specified position, and the crude oil cannot be completely pumped into the pump cavity, so the pump efficiency is low, and the power consumption is large.

[0004] With the continuous breakthrough of oil exploitation technology, a series of new pumping units have been successfully developed. These new pumping units have high technical content, but the whole machine cost is high, and the use, maintenance and maintenance are difficult, and a professional technical service team is required. SUMMARY

[0005] The utility model provides a pulley jacking type hydraulic oil pumping unit, overcomes the above prior art, which can effectively solve the problem of the existing pumping unit that is difficult to use, maintain and maintain.

[0006] The utility model discloses a technical scheme is realized through the following measures: a pulley jacking type hydraulic oil pumping unit, including lower platform, left pulley, right pulley, jacking pulley, jacking mechanism, first connecting rope, second connecting rope, suspension rope device and counterweight, the lower platform left part upside is equipped with the rack, and the rack upside is fixedly installed with upper platform, and the upper platform upside is rotatably installed with left pulley and right pulley with left and right interval, and the upper platform left part lower is equipped with jacking pulley, and the rack lower part is equipped with the jacking mechanism that can make jacking pulley up and down motion, and the first end of first connecting rope is fixedly connected together with the upper side of suspension rope device that is equipped with in jacking pulley lower left after passing through left pulley left part outside, and the second end of first connecting rope is fixedly connected together with the counterweight that is equipped with in upper platform right part lower after passing through right pulley right part outside, and the first end of second connecting rope is fixedly connected together with lower platform, and the second end of second connecting rope is fixedly connected together with suspension rope device upper side after passing through jacking pulley upper part outside.

[0007] The following is further optimization or / and improvement of the above-mentioned utility model technical scheme:

[0008] The above-mentioned jacking mechanism can include support seat, first reversing valve, hydraulic station and jacking hydraulic cylinder, the rack lower part left side is fixedly installed with support seat, and the support seat upper part is fixedly installed together with the lower part of jacking hydraulic cylinder, and the upper end of the piston rod of jacking hydraulic cylinder is rotatably installed together with jacking pulley, and the hydraulic station is arranged in the rack, and the outlet of hydraulic station and the oil return port of hydraulic station are respectively communicated with the first inlet and the first outlet of first reversing valve, and the second outlet of first reversing valve and the inlet of jacking hydraulic cylinder are fixedly communicated with first oil supply pipe, and the outlet of jacking hydraulic cylinder and the second inlet of first reversing valve are fixedly communicated with first oil return pipe.

[0009] The above-mentioned jacking mechanism can further include a controller, the lower side of the rack is fixedly installed with a base, the lower side of the base is detachably fixedly installed together with the upper side of the lower platform, the upper side of the right part of the base corresponding to the position below the counterweight is installed with a buffer pad, and the displacement sensor is installed between the lower side of the counterweight and the upper side of the right part of the lower platform, the displacement sensor is connected with the controller, and the controller is connected with the first reversing valve.

[0010] The above-mentioned base and lower platform can be provided with a let go mechanism, and the let go mechanism includes a let go hydraulic cylinder, a second reversing valve and a fixed seat, the right part of the base is fixedly installed with a fixed seat on the upper side of the right part of the lower platform corresponding to the position of the right side of the base, and the left part of the let go hydraulic cylinder is fixedly installed together with the inside of the right part of the base, and the right end of the piston rod of the let go hydraulic cylinder can be detachably fixedly installed together with the fixed seat after stretching out.

[0011] The yielding mechanism further comprises a second reversing valve, a first inlet and a first outlet of the second reversing valve are fixedly communicated with an outlet of the hydraulic station and an oil return port of the hydraulic station respectively, a second outlet of the second reversing valve and an inlet of the yielding hydraulic cylinder are fixedly communicated with a second oil supply pipe, an outlet of the yielding hydraulic cylinder and a second inlet of the second reversing valve are fixedly communicated with a second oil return pipe, and the second reversing valve is connected with the controller.

[0012] The upper side of the front part of the lower platform corresponding to the front position of the base is fixedly provided with a plurality of front limiting seats at intervals left and right, and the upper part of each front limiting seat is screwed with a front jack screw with the rear end in contact with the front side of the base.

[0013] The front part and the rear part of the base are both fixedly provided with a plurality of supporting screws at intervals left and right, and the lower end of each supporting screw is rotatably provided with a moving wheel.

[0014] The lower side of the upper platform corresponding to the position above the jacking hydraulic cylinder is fixedly provided with a connecting piece.

[0015] The utility model discloses a reasonable and compact structure, the upper part of wellhead polished rod and the suspension rope device are fixedly installed together, the first end of first connecting rope is connected together with the upper part of wellhead polished rod through the suspension rope device, the second end of first connecting rope is fixedly connected with the upper side of counterweight, the jacking mechanism can be oil cylinder, air cylinder or electric push rod, the first end of second connecting rope is fixedly connected with lower platform, and the second end of second connecting rope is connected together with the upper part of wellhead polished rod through the suspension rope device, when the jacking mechanism makes jacking pulley move upwards, the second end of second connecting rope drives the suspension rope device to move upwards, thereby making wellhead polished rod realize the process of going up, at this time, counterweight moves downwards, and the gravity of counterweight acts on wellhead polished rod through first connecting rope, so that wellhead polished rod bears the load of lifting wellhead polished rod together with the gravity of jacking mechanism and counterweight in the process of going up, can reduce the load of jacking mechanism, when the jacking mechanism makes jacking pulley move downwards, wellhead polished rod realizes the process of going down under the action of gravity, at this time, wellhead polished rod lifts counterweight to the initial position through first connecting rope, so reciprocating, the jacking mechanism makes jacking pulley alternate ascending and descending, thereby making wellhead polished rod realize the process of going up and going down, finally, oil in well is pumped to the ground, and the utility model has the advantages of small floor space, simple operation, good balance effect, high work efficiency and low energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] ATTACHMENT Figure 1 It is the front view local section structure schematic diagram of the utility model embodiment one to six.

[0017] ATTACHMENT Figure 2 It is the left view structure schematic diagram of the utility model embodiment one to six after removing hydraulic station.

[0018] Figure Figure 3 The circuit structure schematic diagram of the utility model embodiment three to six.

[0019] Figure Figure 4 The main view structure schematic diagram of the utility model embodiment six when installing.

[0020] The codes in the drawings are as follows: 1 is a lower platform, 2 is a left pulley, 3 is a right pulley, 4 is a jacking pulley, 5 is a wellhead polished rod, 6 is a first connecting rope, 7 is a second connecting rope, 8 is a rope hanger, 9 is a counterweight, 10 is a rack, 11 is an upper platform, 12 is a support seat, 13 is a jacking hydraulic cylinder, 14 is an auxiliary steel wire rope, 15 is a hydraulic station, 16 is a first reversing valve, 17 is a first oil supply pipe, 18 is a first oil return pipe, 19 is a buffer pad, 20 is a displacement sensor, 21 is a controller, 22 is a give-way hydraulic cylinder, 23 is a fixed seat, 24 is a second reversing valve, 25 is a second oil supply pipe, 26 is a second oil return pipe, 27 is a front limit seat, 28 is a front jacking screw, 29 is a rear limit seat, 30 is a rear jacking screw, 31 is a support screw, 32 is a moving wheel, 33 is a base, and 34 is a connecting piece. DETAILED DESCRIPTION

[0021] The utility model is not limited by the following embodiments, and the specific implementation mode can be determined according to the technical scheme of the utility model and actual conditions.

[0022] In the utility model, in order to facilitate the description, the relative position relationship of each component is described according to the layout mode of the drawings attached to the specification, for example, the position relationship of front, back, top, bottom, left and right is determined according to the layout direction of the drawings attached to the specification. Figure 1 Figure 1

[0023] The utility model will be further described below in combination with embodiments and drawings:

[0024] Embodiment one: as shown in the drawings, Figure 1 , 2 ​​As shown, the pulley jacking type hydraulic pumping unit comprises a lower platform 1, a left pulley 2, a right pulley 3, a jacking pulley 4, a jacking mechanism, a first connecting rope 6, a second connecting rope 7, a rope hanger 8 and a counterweight 9, the left upper side of the lower platform 1 is provided with a rack 10, the upper side of the rack 10 is fixedly provided with an upper platform 11, the left and right sides of the upper side of the upper platform 11 are rotatably provided with the left pulley 2 and the right pulley 3, the left lower side of the upper platform 11 is provided with the jacking pulley 4, the lower part of the rack 10 is provided with the jacking mechanism capable of moving the jacking pulley 4 up and down, the first end of the first connecting rope 6 is fixedly connected together with the upper side of the rope hanger 8 provided below and left of the jacking pulley 4 after passing the outer left side of the left pulley 2, the second end of the first connecting rope 6 is fixedly connected together with the counterweight 9 provided below and right of the upper platform 11 after passing the outer right side of the right pulley 3, the first end of the second connecting rope 7 is fixedly connected together with the lower platform 1, the second end of the second connecting rope 7 is fixedly connected together with the upper side of the rope hanger 8 after passing the outer upper side of the jacking pulley 4.

[0025] According to the needs, the left pulley 2, the right pulley 3 and the first connecting rope 6 are one-to-one correspondence, at least one left pulley 2 is rotatably installed on the left upper side of the upper platform 11 through a pair of shaft seats, the number of the left pulley 2 in the embodiment is two, the outer side of each left pulley 2 and the outer side of the right pulley 3 are provided with a rope groove, the jacking pulley 4 and the second connecting rope 7 are one-to-one correspondence, at least one jacking pulley 4 is rotatably installed together with the upper part of the jacking mechanism, the number of the jacking pulley 4 in the embodiment is two, the outer side of each jacking pulley 4 is provided with a rope groove, the first connecting rope 6 and the second connecting rope 7 are both existing known steel wire ropes, the rope hanger 8 is an existing known technology, the distance between the two first connecting ropes 6 is greater than the distance between the two second connecting ropes 7, so that the two jacking pulleys 4 can be arranged at the corresponding positions between the two first connecting ropes 6, the distance between the first connecting rope 6 and the second connecting rope 7 in the left and right directions can be 0 or greater than 0, so that the second connecting rope 7 can avoid interfering with the first connecting rope 6, and the floor area can be reduced.

[0026] In use, the upper part of the wellhead polished rod 5 is fixedly installed together with the suspension rope device 8. The first end of the first connecting rope 6 is connected to the upper part of the wellhead polished rod 5 through the suspension rope device 8, and the second end of the first connecting rope 6 is fixedly connected to the upper side of the counterweight 9. The lifting mechanism can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The first end of the second connecting rope 7 is fixedly connected to the lower platform 1, and the second end of the second connecting rope 7 is connected to the upper part of the wellhead polished rod 5 through the suspension rope device 8. When the lifting mechanism causes the lifting pulley 4 to move upward, the second end of the second connecting rope 7 drives the suspension rope device 8 to move upward, thereby enabling the wellhead polished rod 5 to move upward. At this time, the counterweight 9 moves downward, and the gravity of the counterweight 9 is transmitted through the first connecting rope 8 to the upper side of the counterweight 9. A connecting rope 6 acts on the wellhead polished rod 5. During the upward movement of the wellhead polished rod 5, the weight of the lifting mechanism and the counterweight 9 jointly bear the load of lifting the wellhead polished rod 5, reducing the load on the lifting mechanism. When the lifting mechanism causes the lifting pulley 4 to move downward, the wellhead polished rod 5 descends under gravity. At this time, the wellhead polished rod 5 pulls the counterweight 9 back to its initial position via the first connecting rope 6. This process repeats, with the lifting mechanism causing the lifting pulley 4 to rise and fall alternately, thus enabling the wellhead polished rod 5 to move upward and downward, ultimately pumping the oil from the well to the surface. The entire machine has a compact structure, small footprint, simple operation, good balance, and high working efficiency.

[0027] The above-mentioned pulley-lifting type hydraulic pumping unit can be further optimized and / or improved according to actual needs:

[0028] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the lifting mechanism includes a support base 12, a first directional valve 16, a hydraulic station 15, and a lifting hydraulic cylinder 13. The support base 12 is fixedly installed on the lower left side of the frame 10. The upper part of the support base 12 is fixedly installed together with the lower part of the lifting hydraulic cylinder 13. The upper end of the piston rod of the lifting hydraulic cylinder 13 is rotatably installed together with the lifting pulley 4. The frame 10 is equipped with a hydraulic station 15. The outlet and return port of the hydraulic station 15 are respectively connected to the first inlet and the first outlet of the first directional valve 16. The second outlet of the first directional valve 16 is fixedly connected to the inlet of the lifting hydraulic cylinder 13 by a first oil supply pipe 17. The outlet of the lifting hydraulic cylinder 13 is fixedly connected to the second inlet of the first directional valve 16 by a first return pipe 18.

[0029] Depending on the requirements, the hydraulic station 15 is a known prior art, such as an energy-saving variable frequency hydraulic station or an LXBZ series hydraulic pump station or a DSQ6 / 50H-B electric oil pump described in the patent document with publication number CN110425199A; the lifting hydraulic cylinder 13 is a known prior art, such as a double-acting hydraulic cylinder; and the first directional valve 16 is a known prior art, such as a manual directional valve or an electromagnetic directional valve. During operation, the hydraulic station 15 continuously pumps hydraulic oil into the rodless chamber of the lifting hydraulic cylinder 13 through the first oil supply pipe 17. The hydraulic oil acts on the piston, discharging the hydraulic oil in the rod chamber to the hydraulic oil tank of the hydraulic station 15. Simultaneously, the piston rod of the lifting hydraulic cylinder 13 extends, ultimately causing the lifting pulley 4 to move upward. When the lifting pulley 4 moves upward, the second end of the second connecting rope 7 drives the suspension rope 8 to move upward, thereby enabling the wellhead polished rod 5 to move upward. At this time, the counterweight 9 moves downward, and the weight of the counterweight 9 acts on the wellhead polished rod 5 through the first connecting rope 6. Thus, during the upward movement of the wellhead polished rod 5, the weight of the lifting hydraulic cylinder 13 and the counterweight 9 jointly bear the load of lifting the wellhead polished rod 5, which can reduce the load on the lifting hydraulic cylinder 13.

[0030] Through the first directional valve 16, the hydraulic station 15 continuously pumps hydraulic oil into the rod chamber of the lifting hydraulic cylinder 13 through the first return oil pipe 18. The hydraulic oil acts on the piston, sending the hydraulic oil in the rodless chamber to the hydraulic oil tank of the hydraulic station 15. At the same time, the piston rod of the lifting hydraulic cylinder 13 retracts, causing the lifting pulley 4 to move downward. When the lifting pulley 4 moves downward, the wellhead polished rod 5 moves downward under the action of gravity. At this time, the wellhead polished rod 5 pulls the counterweight 9 to the initial position through the first connecting rope 6.

[0031] In this repeated process, the hydraulic station 15 alternately pumps hydraulic oil into the first oil supply pipe 17 and the first oil return pipe 18, causing the lifting pulley 4 to rise and fall alternately, thereby enabling the wellhead polished rod 5 to move up and down, and finally pumping the oil in the well to the surface.

[0032] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 3, the lifting mechanism also includes a controller 21. A base 33 is fixedly installed on the lower side of the frame 10. The lower side of the base 33 is detachably and fixedly installed together with the upper side of the lower platform 1. A buffer pad 19 is installed on the upper right side of the base 33 corresponding to the position below the counterweight 9. A displacement sensor 20 is installed between the lower side of the counterweight 9 and the upper right side of the lower platform 1. The displacement sensor 20 is connected to the controller 21. The controller 21 is connected to the first reversing valve 16.

[0033] The controller 21 is a known technology, such as a PLC control module or a WYS-2-W displacement sensor controller or an XSAW displacement display controller, according to the requirements. In order to install the controller 21 uniformly, a fixed support is installed on the right upper side of the base 33, a control cabinet is installed on the upper side of the fixed support, and the controller 21 and the switch of the hydraulic station 15 are installed in the control cabinet. Alternatively, the fixed support and the control cabinet can be installed on the right upper side of the lower platform 1. The displacement sensor 20 is a known technology, such as an MPS-XXS rope displacement sensor. The displacement sensor 20 is installed on the upper side of the lower platform 1 or in the base 33. The upper end of the rope of the displacement sensor 20 is fixedly connected to the lower side of the counterweight 9. The middle of the buffer pad 19 is provided with a through hole for passing the rope. The first reversing valve 16 is a known electromagnetic reversing valve, such as a 24 series two-position four-way electromagnetic reversing valve. In the normal position, the P port (first inlet) of the first reversing valve 16 is in communication with the outlet of the hydraulic station 15. The T port (first outlet) of the first reversing valve 16 is in communication with the oil return port (hydraulic oil tank) of the hydraulic station 15. The A port (second inlet) of the first reversing valve 16 is in communication with the inlet (rodless chamber) of the lifting hydraulic cylinder 13. The B port (second outlet) of the first reversing valve 16 is in communication with the outlet (rod chamber) of the lifting hydraulic cylinder 13. The P port of the first reversing valve 16 is in communication with the A port. The B port of the first reversing valve 16 is in communication with the T port. During operation, the hydraulic station 15 pumps hydraulic oil into the P port of the first reversing valve 16, and then the hydraulic oil flows from the A port of the first reversing valve 16 into the rodless chamber of the lifting hydraulic cylinder 13, so that the upper end of the piston rod of the lifting hydraulic cylinder 13 extends upward. At this time, the hydraulic oil in the rod chamber of the lifting hydraulic cylinder 13 flows back to the hydraulic oil tank of the hydraulic station 15 through the B port of the first reversing valve 16 and the T port of the first reversing valve 16, so that the wellhead polished rod 5 realizes the upward movement process.

[0034] When displacement sensor 20 detects that counterweight 9 has moved upward to the first set height, displacement sensor 20 sends a signal to controller 21. Upon receiving the signal, controller 21 causes the first directional valve 16 to switch direction. The P port of the first directional valve 16 is connected to the outlet of hydraulic station 15, the T port of the first directional valve 16 is connected to the return port (hydraulic oil tank) of hydraulic station 15, the A port of the first directional valve 16 is connected to the rodless chamber of lifting hydraulic cylinder 13, the B port of the first directional valve 16 is connected to the rod chamber of lifting hydraulic cylinder 13, the P port of the first directional valve 16 is connected to the B port, and the A port of the first directional valve 16 is connected to the T port. Hydraulic station 15 pumps hydraulic oil into the first directional valve 16. The hydraulic oil flows from port P of the first directional valve 16 to port B of the lifting hydraulic cylinder 13 into the rod chamber, causing the upper end of the piston rod of the lifting hydraulic cylinder 13 to retract downwards. At this time, the hydraulic oil in the rodless chamber of the lifting hydraulic cylinder 13 flows back to the hydraulic oil tank of the hydraulic station 15 through port A and port T of the first directional valve 16, thereby enabling the wellhead polished rod 5 to move downwards. When the displacement sensor 20 detects that the counterweight 9 has moved downwards to the second set height, the displacement sensor 20 sends a signal to the controller 21. After receiving the signal, the controller 21 causes the first directional valve 16 to reverse and return to the normal position, enabling the wellhead polished rod 5 to move upwards again.

[0035] The counterweight 9 reciprocates between the first set height and the second set height. The displacement sensor 20 continuously sends signals to the controller 21. The controller 21 causes the first reversing valve 16 to repeat the reversing action multiple times, causing the piston rod of the lifting hydraulic cylinder 13 to extend and retract alternately, and causing the wellhead polished rod 5 to move up and down alternately, thereby realizing the oil pumping operation.

[0036] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 3 As shown, a clearance mechanism is provided between the base 33 and the lower platform 1. The clearance mechanism includes a clearance hydraulic cylinder 22 and a fixed seat 23. The fixed seat 23 is fixedly installed on the upper right side of the lower platform 1 corresponding to the right position of the base 33. The inner right side of the base 33 is fixedly installed together with the left side of the clearance hydraulic cylinder 22. The piston rod of the clearance hydraulic cylinder 22 can be detachably and fixedly installed together with the fixed seat 23 after the right end extends out. The clearance mechanism also includes a second reversing valve 24. The first inlet and the first outlet of the second reversing valve 24 are fixedly connected to the outlet and the return port of the hydraulic station 15, respectively. A second oil supply pipe 25 is fixedly connected between the second outlet of the second reversing valve 24 and the inlet of the clearance hydraulic cylinder 22. A second oil return pipe 26 is fixedly connected between the outlet of the clearance hydraulic cylinder 22 and the second inlet of the second reversing valve 24. The second reversing valve 24 is connected to the controller 21.

[0037] As required, the clearance hydraulic cylinder 22 and the lifting hydraulic cylinder 13 have the same specifications and model. The clearance hydraulic cylinder 22 can be used as a spare part for the lifting hydraulic cylinder 13, facilitating future maintenance and replacement. The second directional valve 24 has the same structure as the first directional valve 16. During use, when in the oil pumping state, the piston rod of the clearance hydraulic cylinder 22 is in the retracted state and is installed inside the base 33. A protective baffle can be installed on the outside of the base 33 to protect the clearance hydraulic cylinder 22. When it is necessary to stop pumping for well workover, the suspension cable 8 is separated from the wellhead polished rod 5, and the piston rod of the yielding hydraulic cylinder 22 is gradually extended. When the piston rod of the yielding hydraulic cylinder 22 extends to the fixed seat 23, the piston rod of the yielding hydraulic cylinder 22 is fixedly installed together with the fixed seat 23. Then, the piston rod of the yielding hydraulic cylinder 22 is retracted. When the piston rod of the yielding hydraulic cylinder 22 retracts, it drives the base 33 and the frame 10 to move to the right, realizing the yielding function. After the well workover is completed, the piston rod of the yielding hydraulic cylinder 22 is gradually extended, causing the base 33 and the frame 10 to move to the left and return to the initial position. Then, the piston rod of the yielding hydraulic cylinder 22 is separated from the fixed seat 23, and the piston rod of the yielding hydraulic cylinder 22 is retracted to the initial position. Finally, the suspension cable 8 is fixedly installed together with the wellhead polished rod 5, and pumping can begin.

[0038] When the hydraulic station 15 continuously pumps hydraulic oil into the rodless chamber of the yielding hydraulic cylinder 22 through the second oil supply pipe 25, the hydraulic oil acts on the piston, discharging the hydraulic oil in the rod chamber to the hydraulic oil tank of the hydraulic station 15, and at the same time causing the piston rod of the yielding hydraulic cylinder 22 to extend. When the hydraulic station 15 continuously pumps hydraulic oil into the rod chamber of the yielding hydraulic cylinder 22 through the second oil return pipe 26, the hydraulic oil acts on the piston, discharging the hydraulic oil in the rodless chamber to the hydraulic oil tank of the hydraulic station 15, and at the same time causing the piston rod of the yielding hydraulic cylinder 22 to retract.

[0039] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, several front limit seats 27 are fixedly installed on the upper front side of the lower platform 1 at intervals corresponding to the front position of the base 33. Each front limit seat 27 is screwed with a front set screw 28 whose rear end contacts the front side of the base 33. Several rear limit seats 29 are fixedly installed on the upper rear side of the lower platform 1 at intervals corresponding to the rear position of the base 33. Each rear limit seat 29 is screwed with a rear set screw 30 whose front end contacts the rear side of the base 33.

[0040] According to the requirement, the lower platform 1 can be a concrete foundation, three front limit seats 27 are fixedly installed on the upper side of the front part of the lower platform 1 at the front position corresponding to the base 33, three rear limit seats 29 are fixedly installed on the upper side of the rear part of the lower platform 1 at the rear position corresponding to the base 33, the front limit seat 27 and the rear limit seat 29 can be correspondingly arranged, so that when the base 33 is installed, the position of the base 33 is adjusted by adjusting the length of the front jackscrew 28 and the rear jackscrew 30, so that the centering condition of the rope hanger 8 and the well mouth is adjusted, and when the rope hanger 8 and the well mouth are centered, the base 33 and the lower platform 1 can be detachably fixed and installed together through the existing known connecting bolts.

[0041] Embodiment six: as the optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 1 2 As shown in the accompanying drawings, the front part and the rear part of the base 33 are both spaced apart from each other and are screwed with a plurality of support screw rods 31, and the lower end of each support screw rod 31 is rotatably installed with a moving wheel 32.

[0042] According to the requirement, the moving wheel 32 is the existing known technology, such as a brake trolley, and the upper part of each support screw rod 31 is screwed with a locking nut located on the upper side of the base 33, so that the support rod can be locked, the lower platform 1 is a concrete foundation, and two steel plates are pre-buried on the upper side of the front part and the rear part of the lower platform 1, and the moving wheel 32 is located on the steel plates, when it is necessary to displace the pumping unit, the support screw rod 31 is rotated, so that the moving wheel 32 is in contact with the upper side of the steel plate at the corresponding position, the front jackscrew 28 and the rear jackscrew 30 are adjusted, so that the moving wheel 32 is always located on the upper side of the steel plate at the corresponding position, so that the friction is reduced during the left and right movement of the base 33 and the rack 10 through the let-in hydraulic cylinder 22, and only a small force is required to drive the displacement of the pumping unit.

[0043] The above technical features respectively constitute various embodiments of the present application, have strong adaptability and implementation effect, and can increase or decrease unnecessary technical features according to actual needs to meet the needs of different situations.

[0044] The installation process of the best embodiment of the present application: according to the installation layout of the pulley jacking type hydraulic pumping unit, the base 33 is hoisted and placed at the appropriate position of the well mouth, the base 33 is placed on the plane of the lower platform 1, the installation position of the base 33 is adjusted by means of the front jackscrew 28 and the rear jackscrew 30, so that the installation technical requirements are met, the rack 10, the upper platform 11, the jacking hydraulic cylinder 13, the jacking pulley 4 and the hydraulic station 15 are installed in sequence, the piston rod of the jacking hydraulic cylinder 13 is retracted after the controller 21 is powered on, the requirements are met, and the hydraulic circuit of the hydraulic station 15 is normal.

[0045] As shown in the accompanying drawings, Figure 4 ​As shown, in order to facilitate the first connecting rope 6 first end connection with the suspension rope device 8 when the counterweight 9 rises to the first set height, the upper platform 11 lower side corresponding to the position above the jacking hydraulic cylinder 13 is fixedly installed with a known connecting piece 34, such as a steel wire rope fixed clamp head. After the jacking hydraulic cylinder 13 piston rod extends and the counterweight 9 rises to the first set height and stops, one end of the auxiliary steel wire rope 14, the second end of the first connecting rope 6 and the counterweight 9 are fixedly connected, the other end of the auxiliary steel wire rope 14 is sequentially wound around the right side of the right pulley 3, the left side of the left pulley 2 and the lower side of the jacking pulley 4, and then fixedly connected with the steel wire rope fixed clamp head. The first end of the first connecting rope 6 is sequentially wound around the right side of the right pulley 3 and the left side of the left pulley 2 and then naturally falls down. Then the controller 21 works and the piston rod of the jacking hydraulic cylinder 13 is retracted, the counterweight 9 is lifted to the first set height, the first end of the first connecting rope 6 is connected with the suspension rope device 8, the auxiliary steel wire rope 14 is removed, and the first end of the other first connecting rope 6 is fixedly connected with the suspension rope device 8. The second end of the first connecting rope 6 is sequentially wound around the left side of the left pulley 2 and the right side of the right pulley 3 and then naturally falls down. The ends of the two second connecting ropes 7 are fixedly connected with the corresponding positions. Then the controller 21 makes the piston rod of the jacking hydraulic cylinder 13 extend and the counterweight 9 moves downward to the second set height and stops. The second end of the first connecting rope 6 is wound around the left side of the left pulley 2 and the right side of the right pulley 3 and then fixedly connected with the counterweight 9.

[0046] Finally, the displacement sensor 20 is installed. After adjusting the length of the displacement sensor 20 pull rope and checking that the controller 21 is normal, the pulley jacking type hydraulic pumping unit is tested and run. The whole machine is normal, and the installation and debugging work is completed.

Claims

1. A hydraulic oil pumping unit of the pulley jacking type, characterized in that The lower platform is provided with a rack on the left upper side, and the rack is fixedly installed with an upper platform on the upper side, and the upper platform is rotatably installed with a left pulley and a right pulley on the upper side in a left-right interval, and the upper platform is provided with a jacking pulley below the left part, and the lower part of the rack is provided with a jacking mechanism capable of moving the jacking pulley up and down, and the first end of the first connecting rope is fixedly connected together with the upper side of a rope suspender below the left part of the jacking pulley after passing outside the left part of the left pulley, and the second end of the first connecting rope is fixedly connected together with a counterweight below the right part of the upper platform after passing outside the right part of the right pulley, and the first end of the second connecting rope is fixedly connected together with the lower platform, and the second end of the second connecting rope is fixedly connected together with the upper side of the rope suspender after passing outside the upper part of the jacking pulley.

2. The pulley jacking type hydraulic pumping unit according to claim 1, characterized in that The jacking mechanism comprises a support seat, a first reversing valve, a hydraulic station and a jacking hydraulic cylinder, the lower left side of the rack is fixedly installed with the support seat, the upper part of the support seat is fixedly installed together with the lower part of the jacking hydraulic cylinder, the upper end of the piston rod of the jacking hydraulic cylinder is rotatably installed together with the jacking pulley, the hydraulic station is arranged in the rack, the outlet of the hydraulic station and the oil return port of the hydraulic station are in communication with the first inlet and the first outlet of the first reversing valve respectively, the second outlet of the first reversing valve and the inlet of the jacking hydraulic cylinder are fixedly communicated with the first oil supply pipe, and the outlet of the jacking hydraulic cylinder and the second inlet of the first reversing valve are fixedly communicated with the first oil return pipe.

3. The pulley jacking type hydraulic pumping unit according to claim 2, characterized in that The jacking mechanism further comprises a controller, the lower side of the rack is fixedly installed with a base, the lower side of the base is detachably fixedly installed together with the upper side of the lower platform, the upper side of the right part of the base corresponding to the position below the counterweight is installed with a buffer pad, a displacement sensor is installed between the lower side of the counterweight and the upper side of the right part of the lower platform, the displacement sensor is connected with the controller, and the controller is connected with the first reversing valve.

4. The pulley jacking type hydraulic pumping unit according to claim 3, characterized in that A let-in mechanism is arranged between the base and the lower platform, and the let-in mechanism comprises a let-in hydraulic cylinder and a fixing seat, the upper side of the right part of the lower platform corresponding to the right position of the base is fixedly installed with the fixing seat, the right inner side of the base is fixedly installed together with the left part of the let-in hydraulic cylinder, and the right end of the piston rod of the let-in hydraulic cylinder can be detachably fixedly installed together with the fixing seat after being stretched out.

5. The pulley jacking type hydraulic pumping unit of claim 4 wherein The let-in mechanism further comprises a second reversing valve, the first inlet and the first outlet of the second reversing valve are fixedly communicated with the outlet of the hydraulic station and the oil return port of the hydraulic station respectively, the second outlet of the second reversing valve and the inlet of the let-in hydraulic cylinder are fixedly communicated with the second oil supply pipe, the outlet of the let-in hydraulic cylinder and the second inlet of the second reversing valve are fixedly communicated with the second oil return pipe, and the second reversing valve is connected with the controller.

6. The pulley jacking type hydraulic pumping unit according to claim 4 or 5, characterized in that The upper side of the front part of the lower platform corresponding to the front position of the base is fixedly installed with a plurality of front limit seats in a left-right interval, the upper part of each front limit seat is screwed with a front jack screw with the front side of the base in mutual contact, and the upper side of the rear part of the lower platform corresponding to the rear position of the base is fixedly installed with a plurality of rear limit seats in a left-right interval, the upper part of each rear limit seat is screwed with a rear jack screw with the rear side of the base in mutual contact.

7. The pulley jacking type hydraulic pumping unit as set forth in claim 3 or 4 or 5, wherein The front part and the rear part of the base are both fixedly installed with a plurality of support screws in a left-right interval, and the lower end of each support screw is rotatably installed with a moving wheel.

8. The pulley jacking type hydraulic pumping unit of claim 6 wherein The base front and rear are both spaced apart left and right with a plurality of support screws, and each support screw is rotatably installed with a moving wheel at the lower end.

9. The pulley jacking type hydraulic pumping unit as set forth in claim 2 or 3 or 4 or 5 or 8, wherein The upper platform is fixedly installed with a connecting piece on the lower side corresponding to the position above the jacking hydraulic cylinder.

10. The pulley jacking type hydraulic pumping unit of claim 6 wherein The upper platform is fixedly installed with a connecting piece on the lower side corresponding to the position above the jacking hydraulic cylinder.

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