CN111997573B

CN111997573B - Oil pumping unit

Info

Publication number: CN111997573B
Application number: CN202010097282.7A
Authority: CN
Inventors: 王彩娟; 安洪军; 张海生; 田木国; 易博
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2022-11-04
Anticipated expiration: 2040-02-17
Also published as: CN111997573A

Abstract

The application discloses a pumping unit belongs to oil gas exploitation technical field. This beam-pumping unit includes: the walking beam, the bracket, the horse head, the connecting rod, the crank, the fixing piece, the balance block and the power system; the target part of the walking beam is rotatably supported on the bracket, the first end of the walking beam is fixedly connected with the horse head, the second end of the walking beam is rotatably connected with the first end of the connecting rod, and the horse head is used for being fixedly connected with the sucker rod; the crank is provided with a slideway, the fixing piece is limited in the slideway and can move along the length direction of the slideway, and the second end of the connecting rod is rotatably connected with the fixing piece; the first end of the crank is rotatably connected with an output shaft of the power system, and the power system is used for driving the crank to rotate along the output shaft of the power system. In the down stroke of the oil pumping unit, along with the sliding of the fixing piece in the sliding process, the stroke can be gradually lengthened, so that the stroke loss can be reduced, the piston descending time of the deep-well pump is prolonged, the fullness of the deep-well pump is improved, and the oil and gas production efficiency is improved.

Description

Oil pumping unit

Technical Field

The application relates to the technical field of oil and gas exploitation, in particular to a pumping unit.

Background

In an oil and gas exploitation site, a pumping unit is a common oil and gas exploitation device, and the pumping unit comprises a beam pumping unit and a non-beam pumping unit. The beam-pumping unit has simple structure, easy manufacture and convenient use, and can operate in oil field for a long time in all weather, thus having wide application.

Among the correlation technique, beam-pumping unit can include walking beam, horse head, support, crank, connecting rod and driving system, the rotatable support in middle part of walking beam is on the support, the first end of walking beam and the first end rotatable coupling of connecting rod, the second end and the horse head fixed connection of walking beam, the rotatable spacing on the crank of second end of connecting rod, the output shaft rotatable coupling of articulate one end and driving system, driving system fixes on the support, the horse head be used for with polished rod fixed connection. The power system can control the crank to rotate around the output shaft of the power system, and then the crank can drive the connecting rod to swing, further, the connecting rod can drive the walking beam and the horse head to swing together, and drive the polished rod and the sucker rod connected with the polished rod to carry out longitudinal reciprocating motion together, so that the sucker rod can drive the piston of the underground deep well pump to carry out longitudinal reciprocating motion, and further, the exploitation of underground oil gas is realized.

However, because the sucker rod connected with the polished rod has elasticity, in a down stroke of the pumping unit, the length of the sucker rod can be shortened in the process that the horsehead and the sucker rod synchronously move downwards, and when the horsehead changes the stroke direction, the sucker rod can be restored to the original length in the future, and at the moment, the horsehead can drive the sucker rod to synchronously move upwards. Thus, in a down stroke, the lower end of the sucker rod moves a distance less than the horse head, thereby causing a stroke loss. Therefore, the moving distance of the piston of the deep-well pump is shortened, so that the filling degree of the deep-well pump is smaller, and the oil gas output is reduced.

Disclosure of Invention

The application provides a pumping unit, can solve the less problem of degree of fullness of deep-well pump. The technical scheme is as follows:

in one aspect, a pumping unit is provided, comprising: the walking beam, the bracket, the horse head, the connecting rod, the crank, the fixing piece, the balance block and the power system;

the target part of the walking beam is rotatably supported on the bracket, the first end of the walking beam is fixedly connected with the horse head, the second end of the walking beam is rotatably connected with the first end of the connecting rod, the horse head is used for being fixedly connected with a polish rod, and the target part refers to the position of the walking beam except two ends;

the crank is provided with a slide way, the length direction of the slide way is not perpendicular to the length direction of the crank, the fixing piece is limited in the slide way and can move along the length direction of the slide way, and the second end of the connecting rod is rotatably connected with the fixing piece;

the first end of the crank is rotatably connected with an output shaft of the power system, the second end of the crank is fixedly connected with the balance block, and the power system is used for driving the crank to rotate along the output shaft of the power system.

In a possible implementation, the inner wall of the slideway is provided with a needle bearing, and the fixing piece comprises a crank pin;

one end of the crank pin penetrates through the needle bearing and is limited on the first side of the crank;

the other end of the crank pin is rotatably connected with the second end of the connecting rod and is limited at the second side of the crank.

Optionally, an included angle between the length direction of the slideway and the length direction of the crank is less than or equal to 15 degrees.

Optionally, the pumping unit further comprises a cylinder and a compression rod;

the first end of the air cylinder is connected with the support, the first end of the compression rod extends into the second end of the air cylinder and is movably and hermetically connected with the air cylinder, and the second end of the compression rod is rotatably connected with the walking beam.

Optionally, the pumping unit further comprises an air storage tank, and the air storage tank is communicated with the air cylinder.

Optionally, the first end of the cylinder is rotatably connected with the bracket.

Optionally, the pumping unit further comprises a sliding block;

the first end of the cylinder is fixedly connected with the bracket, the sliding block is limited on the walking beam in a sliding way, and the second end of the compression rod is rotatably connected with the sliding block.

Optionally, the pumping unit further comprises a first connecting bearing, and the first end of the connecting rod and the second end of the walking beam, and the bracket and the target portion of the walking beam are rotatably connected through the first connecting bearing.

Optionally, the power system comprises an electric motor and a reduction gearbox;

the power input end of the reduction gearbox is in transmission connection with the output shaft of the motor, and the power output end of the reduction gearbox is in rotatable connection with the first end of the crank.

Optionally, the power system further comprises a transmission belt, and an output shaft of the motor is connected with the power input end of the reduction gearbox through the transmission belt.

The technical scheme provided by the application has the beneficial effects that at least:

the mounting is spacing in the slide, and can move along the length direction of slide, and the length direction of slide is out of plumb with the length direction of crank, and the mounting is when moving along the length direction of slide, and the distance of mounting and the first end of crank can change for the amplitude of oscillation of connecting rod produces the change. Thus, the stroke can be gradually lengthened in the down stroke of the pumping unit, and the stroke can be gradually shortened in the up stroke of the pumping unit. Due to the change of the stroke, the descending time of the sucker rod connected with the polished rod is longer than the ascending time of the sucker rod, so that the sucker rod has enough time to recover to the original length when descending, and the stroke loss is reduced. Furthermore, when the sucker rod moves downwards, the down time of the piston of the deep-well pump is prolonged, and the flow of oil entering the upper part of the piston of the deep-well pump is increased, so that the fullness of the deep-well pump can be improved; when the sucker rod goes upward, the upward time of the piston of the deep-well pump is shortened, so that the leakage of oil in the deep-well pump is reduced, and the oil-gas production efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pumping unit according to an embodiment of the present disclosure;

fig. 2 is a partially enlarged schematic structural diagram of an oil pumping unit provided in an embodiment of the present application.

Reference numerals:

1: a walking beam; 2: a support; 3: a donkey head; 4: a connecting rod; 5: a crank; 6: a fixing member; 7: a counterbalance; 8: a power system; 9: a cylinder;

41: a first connecting bearing; 51: a slideway; 52: a needle bearing; 81: an electric motor; 82: a reduction gearbox; 83: a transmission belt; 91: a gas storage tank; 92: a slider; 101: compressing the rod.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 illustrates a schematic structural diagram of an oil pumping unit according to an embodiment of the present application. As shown in fig. 1, the pumping unit includes: the walking beam comprises a walking beam 1, a bracket 2, a horse head 3, a connecting rod 4, a crank 5, a fixing piece 6, a balance block 7 and a power system 8; the target part of the walking beam 1 is rotatably supported on the bracket 2, the first end of the walking beam 1 is fixedly connected with the horse head 3, the second end of the walking beam 1 is rotatably connected with the first end of the connecting rod 4, the horse head 3 is used for being fixedly connected with the polish rod, and the target part is the position of the walking beam 1 except two ends; the crank 5 is provided with a slideway 51, the length direction of the slideway 51 is not perpendicular to the length direction of the crank 5, the fixing piece 6 is limited in the slideway 51 and can move along the length direction of the slideway 51, and the second end of the connecting rod 4 is rotatably connected with the fixing piece 6; the first end of the crank 5 is rotatably connected with an output shaft of a power system 8, the second end of the crank 5 is fixedly connected with a balance weight 7, and the power system 8 is used for driving the crank 5 to rotate along the output shaft of the power system 8.

In this embodiment, the fixing member 6 is limited in the slide 51 and can move along the length direction of the slide 51, the length direction of the slide 51 is not perpendicular to the length direction of the crank 5, and when the fixing member 6 moves along the length direction of the slide 51, the distance between the fixing member 6 and the first end of the crank 5 can be changed, so that the swing amplitude of the connecting rod 4 is changed. Thus, the stroke can be gradually lengthened in the down stroke of the pumping unit, and the stroke can be gradually shortened in the up stroke of the pumping unit. Due to the change of the stroke, the descending time of the sucker rod connected with the polished rod is longer than the ascending time of the sucker rod, so that the sucker rod has enough time to recover to the original length when descending, and the stroke loss is reduced. Furthermore, when the sucker rod moves downwards, the down time of the piston of the deep-well pump is prolonged, and the flow of oil entering the upper part of the piston of the deep-well pump is increased, so that the fullness of the deep-well pump can be improved; when the sucker rod goes upward, the upward time of the piston of the deep-well pump is shortened, so that the leakage of oil in the deep-well pump is reduced, and the oil-gas production efficiency is improved.

The polished rod is used for being connected with a plurality of sucker rods, each sucker rod can be fixedly connected through a short section, and the sucker rod positioned at the lowest position is used for being fixedly connected with a piston of a deep well pump. Each sucker rod can be located in the well, and the horse head 3 can drive the polished rod and each sucker rod to reciprocate together.

It should be noted that, because the pumping unit reduces the stroke loss when pumping, the moving range of the polish rod and the sucker rod is large, when a plurality of sucker rods and polish rods move together, the uppermost sucker rod may extend out of the well mouth, so the joint between the sucker rod and the polish rod can not be provided with a short section to avoid the short section from scraping the well mouth.

The actual operation process of the oil pumping unit is as follows: at the beginning of the downstroke, the horse head 3 is at the highest position, the counterweight 7 is at the lowest position, and the mount 6 is located in the slide 51 closest to the first end of the crank 5. As the crank 5 rotates, the fixed member 6 can move in the slide 51, resulting in a gradually increasing distance between the fixed member 6 and the first end of the crank 5, and thus a gradually increasing stroke of the pumping unit. At the same time, the distance between the fixing member 6 and the balance weight 7 is shortened, so that the balance adjustment of the balance weight 7 is adapted to the change of the stroke. When the crank 5 rotates, the horse head 3 drives the piston of the deep-well pump to move downwards together through the polish rod and the sucker rod, the floating valve in the piston is opened, the fixed valve at the lower end of the deep-well pump is closed, and oil liquid below the piston flows to the upper side of the piston after passing through the floating valve. The stroke of the pumping unit is gradually increased, so that the time for the piston to descend is increased. Therefore, the oil pumping unit can enable more oil to flow to the upper part of the piston, so that the fullness of the deep-well pump can be improved. When the upstroke begins, the horse head 3 is at the lowest position, the counterweight 7 is at the highest position, and the mount 6 is at the furthest position within the slideway 51 from the first end of the crank 5. As the crank 5 rotates, the fixed member 6 may move within the slide 51, causing the distance between the fixed member 6 and the first end of the crank 5 to gradually decrease, and thus the stroke of the pumping unit to gradually decrease. When the crank 5 rotates, the horse head 3 and the piston of the deep-well pump move upwards together, the floating valve in the piston is closed, the fixed valve at the lower end of the deep-well pump is opened, and oil above the piston begins to be discharged to a well mouth. The stroke of the pumping unit is gradually reduced, so that the upward time of the piston is shortened. Therefore, the oil pumping unit can quickly discharge oil in the deep well pump out of a well mouth, and the leakage of the oil in the liquid discharging process is reduced.

In some embodiments, as shown in fig. 2, the inner wall of the slide 51 may be provided with a needle bearing 52, and the fixing member 6 may comprise a crank pin; one end of the crank pin passes through the needle bearing 52 and is limited on the first side of the crank 5; the other end of the crank pin is rotatably connected to the second end of the connecting rod 4 and is limited to the second side of the crank 5.

The slide 51 may be an elliptical slide 51, and accordingly, the shape of the outer race of the needle roller bearing 52 provided in the elliptical slide 51 may also be an elliptical shape. Of course, the slide way 51 may be an elongated slide way 51, and the shape of the bearing outer ring of the needle bearing 52 disposed in the elongated slide way 51 may also be an elongated shape, which is not limited in the embodiment of the present invention.

The one end of the crank pin may be limited to the first side of the crank 5 by a fixing nut, and of course, the one end of the crank pin may also be limited by other components, which is not limited in the embodiment of the present application.

The end of the crank pin connected with the connecting rod 4 can be provided with a second connecting bearing, the inner ring of the bearing of the second connecting bearing can be fixedly connected with the end of the crank pin close to the connecting rod 4, and the outer ring of the bearing of the second connecting bearing can be fixedly connected with the connecting rod 4. In this way, the second connection bearing ensures the flexibility of the rotatable connection between the crank pin and the connecting rod 4. In the actual implementation process, the bearing outer ring of the second connecting bearing may be fixedly connected to the reinforcing housing, and the second end of the connecting rod 4 may be fixedly connected to the reinforcing housing. The reinforcing shell not only can ensure the firmness and the connection strength of the connection between the connecting rod 4 and the bearing outer ring of the second connecting bearing, but also can firmly limit the end, connected with the connecting rod 4, of the crank pin at the second side of the crank 5.

The needle bearing 52 may include a bearing outer ring and a plurality of cylindrical rollers arranged on an inner wall of the bearing outer ring, the bearing outer ring is fixedly connected to the inner wall of the slideway 51, and the crank pin passes through the bearing outer ring and contacts at least one of the plurality of cylindrical rollers. Thus, as the crank pin moves within the needle bearing 52, the cylindrical rollers on the inner wall of the bearing outer race in contact with the crank pin rotate relative to the crank pin, thereby reducing the friction experienced by the crank pin during movement and increasing the flexibility of movement of the crank pin.

In some embodiments, the bearing outer race of the needle bearing 52 may be fixedly coupled to the runner 51 with screws. For example, the side wall of the bearing outer ring of the needle bearing 52 and the inner wall of the slideway 51 can be provided with a half threaded hole, and the length direction of the threaded hole is perpendicular to the plane of the crank 5. Thus, the screw can be screwed into the complete threaded hole formed by splicing the bearing outer ring and the slideway 51, and the needle bearing 52 and the slideway 51 can be fixedly connected. Of course, the needle bearing 52 may be fixedly connected to the slideway 51 in other ways, which is not limited in this embodiment of the present application.

It should be noted that the needle bearing 52 is fixed by a screw, so that the needle bearing 52 can be easily removed and replaced, and when the needle bearing 52 needs to be replaced, the screw is removed, and then the needle bearing 52 is removed.

Further, a bushing may be mounted on the crank pin for protection of the crank pin. Wherein the bushing can be fitted over the crank pin, the outer wall of the bushing being able to contact the cylindrical rollers of the needle bearing 52. In this way, the bushing protects the crank pin from wear caused by direct contact and collision of the crank pin with the needle bearing 52.

Wherein the outer diameter of the bushing may be slightly smaller than the width of the needle bearing 52, which ensures flexibility in moving the crank pin together with the bushing within the needle bearing 52.

In some embodiments, as shown in fig. 1, an included angle between the length direction of the slideway 51 and the length direction of the crank 5 may be an acute angle, so that when the crank 5 and the connecting rod 4 are located on a straight line, the second end of the connecting rod 4 moves rapidly, and thus, the stability of stroke change during the operation of the pumping unit may be ensured.

Illustratively, the angle between the length direction of the slideway 51 and the length direction of the crank 5 is greater than 0 degrees and less than or equal to 15 degrees. In this way, it is ensured that the variation of the distance of the fixing member 6 with respect to the first end of the crank 5 can be made closer to the length of the slide 51, and a larger stroke variation range can be ensured. Of course, the included angle between the length direction of the slideway 51 and the length direction of the crank 5 can also be set according to practical situations, and the embodiment of the present application does not limit this.

In other embodiments, the length direction of the slide 51 may also be parallel to the length direction of the crank 5. At this time, in order to avoid the rapid movement of the second end of the connecting rod 4 when the crank 5 and the connecting rod 4 are located on the same straight line, the pumping unit may further include a cylinder 9 and a compression rod 101; the first end of cylinder 9 is connected with support 2, and the first end of compression pole 101 stretches into the second end of cylinder 9 and with the mobilizable sealed connection of cylinder 9, the second end of compression pole 101 and walking beam 1 rotatable coupling.

When the portion of the walking beam 1 connected to the compression rod 101 swings downward, the compression rod 101 moves in a direction toward the cylinder 9, and the first end of the compression rod 101 presses the gas in the cylinder 9, thereby compressing the gas in the cylinder 9 and storing energy. When the portion of the walking beam 1 connected to the compression rod 101 swings upward, the compression rod 101 can be moved in a direction away from the cylinder 9, and the compressed gas stored with energy in the cylinder 9 expands and applies a thrust to the compression rod 101, so that the thrust can be indirectly applied to the walking beam 1 through the compression rod 101. In this way, the cylinder 9 and compression rod 101 can assist the swing of the walking beam 1 and the operation of the pumping unit, reducing the energy consumption and power output of the power system 8. In addition, since the cylinder 9 and the compression rod 101 can support the walking beam 1, the stability of the walking beam 1 during swinging can be enhanced, and in the case that the length direction of the slideway 51 is parallel to the length direction of the crank 5, when the crank 5 and the connecting rod 4 are positioned on a straight line, the cylinder 9 and the compression rod 101 can avoid the rapid movement of the second end of the connecting rod 4.

Wherein the first end of the cylinder 9 may be disposed on the side of the bracket 2 near the first end of the walking beam 1, and accordingly, the compression rod 101 may be near the first end of the walking beam 1. Of course, the first end of the cylinder 9 may be provided on the side of the bracket 2 near the second end of the walking beam 1, and accordingly, the compression rod 101 may be near the second end of the walking beam 1.

In some embodiments, as shown in fig. 1, the pumping unit may further include a slider 92; the first end of cylinder 9 is fixedly connected with bracket 2, slider 92 is slidable spacing on walking beam 1, and the second end of compression rod 101 is rotatably connected with slider 92. Thus, the slider 92 is arranged to accommodate changes in the angle of the walking beam 1 relative to the compression rod 101 and changes in the contact area of the compression rod 101 with the walking beam 1 as the compression rod 101 oscillates.

Wherein, the first end of cylinder 9 can weld on support 2, of course also can be through other modes and support 2 fixed connection, and this application embodiment does not do the restriction to this. The slider 92 may be a roller, and accordingly, the walking beam 1 may be provided with a raceway corresponding to the roller in a length direction. Thus, the roller can not only rotate relative to the compression rod 101 but also move linearly relative to the walking beam 1.

In other embodiments, the first end of the cylinder 9 may also be rotatably connected to the bracket 2, and the second end of the compression rod 101 may also be rotatably connected to the walking beam 1, and of course, the second end of the compression rod 101 may also be rotatably and slidably connected to the walking beam 1, which is not limited in this embodiment. Therefore, the direction of the cylinder 9 can be flexibly adjusted, and the walking beam 1 can swing within a larger range.

In some embodiments, as shown in fig. 1, the pumping unit may further include an air tank 91, and the air tank 91 is communicated with the cylinder 9. Thus, the gas tank 91 can store more gas, and thus the gas can accumulate more energy when compressed, and the compressed gas can provide more power to the compression rod 101 and the walking beam 1.

In some embodiments, as shown in fig. 1, when an included angle between the length direction of the slide 51 and the length direction of the crank 5 is an acute angle, the pumping unit may also include an air cylinder 9, a compression rod 101, and an air tank 91, and a connection manner of the air cylinder 9, the compression rod 101, and the air tank 91 is the same as or similar to that of the above embodiments, which is not repeated herein.

In some embodiments, as shown in fig. 1, the power system 8 may include an electric motor 81 and a reduction gearbox 82; the power input end of the reduction gearbox 82 is in transmission connection with the output shaft of the motor 81, and the power output end of the reduction gearbox 82 is in rotatable connection with the first end of the crank 5. In this way, after the reduction of the speed by the reduction gear box 82 is achieved, a larger power can be output, and the crank 5 can be driven to rotate more smoothly. The reduction gearbox 82 with different reduction ratios can be selected according to actual conditions, and the embodiment of the present application is not limited to this.

In some embodiments, as shown in fig. 1, the power system 8 may further include a belt 83, and the output shaft of the motor 81 is connected to the power input end of the reduction gearbox 82 through the belt 83.

Wherein, a motor shaft of the motor 81 can be provided with a first belt wheel, a power input end of the reduction box 82 can be provided with a second belt wheel, the transmission belt 83 can be sleeved on the first belt wheel and the second belt wheel,

it should be noted that the diameter of the first belt wheel may be smaller than the diameter of the second belt wheel, so that the high-speed rotation of the motor 81 may be converted into the low-speed rotation of the power input end of the reduction box 82, and the speed reduction and torque increase of the power input end of the reduction box 82 are realized by the transmission connection portion of the power input end of the reduction box 82 and the motor 81. Therefore, the power input end of the reduction gearbox 82 can transmit larger power to the interior of the reduction gearbox 82, so that the power transmission of internal parts of the reduction gearbox 82 is facilitated, and the reduction function of the reduction gearbox 82 is further facilitated.

In some embodiments, as shown in fig. 1, the power system 8 may further include a brake lever mechanically connected to the reduction gearbox 82, and after the brake lever is tightened, the crank 5 may be indirectly controlled to stop rotating through the reduction gearbox 82. When the pumping unit is required to stop running completely immediately, the motor can be turned off first, then the brake rod is pulled, and the crank 5 can stop rotating immediately after overcoming the inertia force by the brake rod. Therefore, the brake lever avoids the consequence that the crank 5 can not stop immediately due to inertia force, and further can ensure the safety of the oil pumping unit.

In some embodiments, as shown in fig. 1, the pumping unit may further include a first connecting bearing 41, and the first end of the connecting rod 4 and the second end of the walking beam 1, and the bracket 2 and the target portion of the walking beam 1 may be rotatably connected by the first connecting bearing 41. In this way, the first connection bearing 41 can ensure a rotatable connection between the connecting rod 4 and the walking beam 1, and between the walking beam 1 and the bracket 2. In addition, the first connection bearing 41 has excellent load-bearing performance, and can stably support the walking beam 1.

The bearing inner ring of the first connecting bearing 41 located between the first end of the connecting rod 4 and the second end of the walking beam 1 may be fixedly connected to the connecting rod 4, and the bearing outer ring may be fixedly connected to the second end of the walking beam 1, and of course, the first connecting bearing 41 may also be connected to the connecting rod 4 and the walking beam 1 in other manners. The bearing inner ring of the first connecting bearing 41 located between the support 2 and the target position of the walking beam 1 may be fixedly connected to the support 2, and the bearing outer ring may be fixedly connected to the target position of the walking beam 1, of course, the first connecting bearing 41 may also be connected to the support 2 and the walking beam 1 in other manners, which is not limited in the embodiment of the present application.

In this application embodiment, the mounting is spacing in the slide, and can move along the length direction of slide, and the length direction of slide is out of plumb with the length direction of crank, and the mounting is when moving along the length direction of slide, and the distance of mounting and the first end of crank can change for the amplitude of oscillation of connecting rod produces the change. Thus, the stroke can be gradually lengthened in the down stroke of the pumping unit, and the stroke can be gradually shortened in the up stroke of the pumping unit. Due to the change of the stroke, the descending time of the sucker rod connected with the polished rod is longer than the ascending time of the sucker rod, so that the sucker rod has enough time to recover to the original length when descending, and the stroke loss is reduced. Furthermore, when the sucker rod moves downwards, the down time of the piston of the deep-well pump is prolonged, and the flow of oil entering the upper part of the piston of the deep-well pump is increased, so that the fullness of the deep-well pump can be improved; when the sucker rod goes upward, the upward time of the piston of the deep-well pump is shortened, so that the leakage of oil in the deep-well pump is reduced, and the oil-gas production efficiency is improved. Furthermore, in one stroke of the pumping unit, the pumping unit can automatically adjust the length change of the stroke, so that the stable operation of the pumping unit is ensured, and the damage of the power system doing work instantly to each device of the pumping unit can be avoided. The cylinder and the compression rod can provide power for the walking beam, assist the swinging of the walking beam and the operation of the pumping unit, and reduce the energy consumption and the power output of a power system.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pumping unit, comprising: a walking beam (1), a bracket (2), a horse head (3), a connecting rod (4), a crank (5) the fixing piece (6), the balance block (7) and the power system (8);

the target part of the walking beam (1) is rotatably supported on the bracket (2), the first end of the walking beam (1) is fixedly connected with the horse head (3), the second end of the walking beam (1) is rotatably connected with the first end of the connecting rod (4), the horse head (3) is used for being fixedly connected with a polished rod, and the target part is the position on the walking beam (1) except two ends;

a slide way (51) is arranged on the crank (5), the length direction of the slide way (51) is not perpendicular to the length direction of the crank (5), the fixing piece (6) is limited in the slide way (51) and can move along the length direction of the slide way (51), and the second end of the connecting rod (4) is rotatably connected with the fixing piece (6);

the first end of the crank (5) is rotatably connected with an output shaft of the power system (8), the second end of the crank (5) is fixedly connected with the balance block (7), and the power system (8) is used for driving the crank (5) to rotate along the output shaft of the power system (8);

a needle bearing (52) is arranged on the inner wall of the slide way (51), and the fixing piece (6) comprises a crank pin; one end of the crank pin penetrates through the needle bearing (52) and is limited on a first side of the crank (5); the other end of the crank pin is rotatably connected with the second end of the connecting rod (4) and limited at the second side of the crank (5); wherein the needle roller bearing (52) comprises a bearing outer ring and a plurality of cylindrical rollers arranged on the inner wall of the bearing outer ring, the bearing outer ring is fixedly connected with the inner wall of the slideway (51), and the crank pin passes through the bearing outer ring and is contacted with at least one cylindrical roller in the plurality of cylindrical rollers;

the included angle between the length direction of the slide way (51) and the length direction of the crank (5) is smaller than or equal to 15 degrees.

2. The pumping unit of claim 1, further comprising a cylinder (9) and a compression rod (101);

the first end of the air cylinder (9) is connected with the support (2), the first end of the compression rod (101) extends into the second end of the air cylinder (9) and is movably connected with the air cylinder (9) in a sealing mode, and the second end of the compression rod (101) is rotatably connected with the walking beam (1).

3. The pumping unit of claim 2, further comprising an air reservoir (91), wherein the air reservoir (91) is in communication with the cylinder (9).

4. A pump unit according to claim 2 or 3, characterized in that the first end of the cylinder (9) is rotatably connected to the bracket (2).

5. The pumping unit of claim 2 or 3, further comprising a slider (92);

the first end of the cylinder (9) is fixedly connected with the bracket (2), the sliding block (92) is limited on the walking beam (1) in a sliding mode, and the second end of the compression rod (101) is rotatably connected with the sliding block (92).

6. The pumping unit according to claim 1, characterized in that the pumping unit further comprises a first connecting bearing (41), and the first connecting bearing (41) is rotatably connected between the first end of the connecting rod (4) and the second end of the walking beam (1), and the first connecting bearing (41) is rotatably connected between the bracket (2) and the target portion of the walking beam (1).

7. The pumping unit according to claim 1, characterized in that the power system (8) comprises an electric motor (81) and a reduction gearbox (82);

the power input end of the reduction gearbox (82) is in transmission connection with the output shaft of the motor (81), and the power output end of the reduction gearbox (82) is rotatably connected with the first end of the crank (5).

8. The pumping unit according to claim 7, characterized in that the power system (8) further comprises a transmission belt (83), and the output shaft of the electric motor (81) is connected with the power input end of the reduction gearbox (82) through the transmission belt (83).