CN111997573A - pumping unit - Google Patents

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 down stroke, the stroke can be gradually lengthened, so that the stroke loss can be reduced, the down time of the piston of the deep-well pump is prolonged, the fullness of the deep-well pump is improved, and the oil-gas production efficiency is improved.

Description

pumping unit

technical field

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

Background technique

In the oil and gas extraction site, the pumping unit is a common oil and gas extraction equipment, and the pumping unit includes the beam pumping unit and the beamless pumping unit. Among them, the beam pumping unit is simple in structure, easy to manufacture, easy to use, and can operate in the oil field all day long, so it is widely used.

In the related art, the beam pumping unit may include a beam, a donkey head, a bracket, a crank, a connecting rod and a power system. The middle of the beam is rotatably supported on the bracket, and the first end of the beam is connected to the connecting rod. The first end of the connecting rod is rotatably connected, the second end of the beam is fixedly connected with the donkey head, the second end of the connecting rod is rotatably limited on the crank, and one end of the crank is rotatably connected with the output shaft of the power system, the power system It is fixed on the bracket, and the donkey head is used for fixed connection with the polished rod. 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, and further, the connecting rod can drive the beam and the donkey head to swing together, and drive the polished rod and the sucker rod connected with the polished rod to move together. Longitudinal reciprocating motion, so that the sucker rod can drive the piston of the deep well pump to perform longitudinal reciprocating motion, thereby realizing the exploitation of underground oil and gas.

However, due to the elasticity of the sucker rod connected to the polished rod, the length of the sucker rod itself will be shortened when the donkey head moves down synchronously with the sucker rod in a downstroke of the pumping unit. When the donkey head changes the stroke direction, the sucker rod will not return to its original length, at this time the donkey head will drive the sucker rod to move upward synchronously. In this way, in one downstroke, the moving distance of the lower end of the sucker rod is smaller than the moving distance of the donkey's head, thus causing a stroke loss. Therefore, the moving distance of the piston of the deep well pump will be shortened, resulting in a smaller filling degree of the deep well pump, reducing the output of oil and gas.

SUMMARY OF THE INVENTION

The present application provides an oil pumping unit, which can solve the problem of low fullness of deep well pumps. The technical solution is as follows:

In one aspect, an oil pumping unit is provided, the oil pumping unit includes: a beam, a bracket, a donkey head, a connecting rod, a crank, a fixed part, a balance weight and a power system;

The target part of the travel beam is rotatably supported on the bracket, the first end of the travel beam is fixedly connected with the donkey head, and the second end of the travel beam is connected with the first end of the connecting rod Rotatable connection, the donkey head is used for fixed connection with the polished rod, and the target position refers to the position on the beam except the two ends;

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

The first end of the crank is rotatably connected to the output shaft of the power system, the second end of the crank is fixedly connected to the balance block, and the power system is used to drive the crank along the power system. The output shaft rotates.

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

One end of the crank pin passes through the needle bearing and is limited to 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 on the second side of the crank.

Optionally, the 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 includes a cylinder and a compression rod;

The first end of the air cylinder is connected with the bracket, the first end of the compression rod extends into the second end of the air cylinder, and is connected with the air cylinder in a movable seal, and the second end of the compression rod It is rotatably connected with the beam.

Optionally, the oil pumping unit further includes an air storage tank, and the air storage tank communicates with the cylinder.

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

Optionally, the oil pumping unit further includes a sliding block;

The first end of the cylinder is fixedly connected with the bracket, the sliding block is slidably limited on the beam, and the second end of the compression rod is rotatably connected with the sliding block.

Optionally, the pumping unit further includes a first connecting bearing, between the first end of the connecting rod and the second end of the beam, and between the bracket and the target position of the beam All are rotatably connected through the first connecting bearing.

Optionally, the power system includes an electric motor and a gear box;

The power input end of the reduction box is in driving connection with the output shaft of the electric motor, and the power output end of the reduction box is rotatably connected with the first end of the crank.

Optionally, the power system further includes a transmission belt, and the output shaft of the electric motor is connected with the power input end of the reduction box through the transmission belt.

The beneficial effects of the technical solutions provided by this application may at least include:

The fixed part is limited in the slideway and can move along the length of the slideway, but the length of the slideway is not perpendicular to the length of the crank. When the fixed part moves along the length of the slideway, the first The distance of one end can be changed, so that the swing amplitude of the connecting rod can be changed. In this way, in the downstroke of the oil pumping unit, the stroke can be gradually longer, and in the upstroke of the oil pumping unit, the stroke can be gradually shortened. Due to the change of the stroke, the downward duration of the sucker rod connected with the polished rod is longer than the upward duration of the sucker rod, so that the sucker rod has enough time to recover to the original length when it is downward, thereby reducing the stroke loss. Further, when the sucker rod goes down, the down time of the piston of the deep well pump is prolonged, thereby increasing the flow rate of oil entering the top of the piston of the deep well pump, so that the filling degree of the deep well pump can be improved; when the sucker rod goes up, it shortens the time of the deep well pump. The up time of the piston is shortened, thereby reducing the oil leakage in the deep well pump, thereby improving the oil and gas production efficiency.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a pumping unit provided by an embodiment of the present application;

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

Reference number:

1: Travel beam; 2: Bracket; 3: Donkey head; 4: Connecting rod; 5: Crank; 6: Fixing part; 7: Balance weight; 8: Power system; 9: Cylinder;

41: first connecting bearing; 51: slideway; 52: needle bearing; 81: electric motor; 82: reduction box; 83: transmission belt; 91: air storage tank; 92: slider; 101: compression rod.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in 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 Figure 1, the pumping unit includes: a beam 1, a bracket 2, a donkey head 3, a connecting rod 4, a crank 5, a fixed part 6, a balance block 7 and a power system 8; the target part of the beam 1 is rotatable Supported on the bracket 2, the first end of the travel beam 1 is fixedly connected with the donkey head 3, the second end of the travel beam 1 is rotatably connected with the first end of the connecting rod 4, and the donkey head 3 is used for fixed connection with the polished rod. The position refers to the position on the beam 1 except the 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, and the fixing member 6 is limited in the slideway 51, And can move along the length of the slideway 51, the second end of the connecting rod 4 is rotatably connected with the fixing member 6; the first end of the crank 5 is rotatably connected with the output shaft of the power system 8, and the second end of the crank 5 is connected with The balance weight 7 is fixedly connected, and the power system 8 is used to drive the crank 5 to rotate along the output shaft of the power system 8 .

In the embodiment of the present application, the fixing member 6 is limited in the slideway 51 and can move along the length direction of the slideway 51, but the lengthwise direction of the slideway 51 is not perpendicular to the length direction of the crank 5, and the fixing member 6 is in the slideway 51 along the length direction. When the length direction of the track 51 moves, 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. In this way, in the downstroke of the oil pumping unit, the stroke can be gradually longer, and in the upstroke of the oil pumping unit, the stroke can be gradually shortened. Due to the change of the stroke, the downward duration of the sucker rod connected with the polished rod is longer than the upward duration of the sucker rod, so that the sucker rod has enough time to recover to the original length when it is downward, thereby reducing the stroke loss. Further, when the sucker rod goes down, the down time of the piston of the deep well pump is prolonged, thereby increasing the flow rate of oil entering the top of the piston of the deep well pump, so that the filling degree of the deep well pump can be improved; when the sucker rod goes up, it shortens the time of the deep well pump. The up time of the piston is shortened, thereby reducing the oil leakage in the deep well pump, thereby improving the oil and gas production efficiency.

Among them, the polished rod is used to connect with a plurality of sucker rods, and each sucker rod can be fixedly connected by a short joint, and the sucker rod located at the bottom is used for fixed connection with the piston of the deep well pump. Each sucker rod can be located downhole, and the donkey head 3 can drive the polished rod to reciprocate together with each sucker rod.

It should be noted that, because the stroke loss is reduced when the pumping unit is used for drainage, the movement range of the polished rod and the sucker rod is relatively large. When multiple sucker rods and polished rods move together, the uppermost pump The oil rod may protrude out of the wellhead, so the connection between the sucker rod and the polished rod cannot be provided with a sub joint to avoid the scratching of the sub joint to the wellhead.

The actual operation process of the pumping unit is as follows: at the beginning of the down stroke, the donkey head 3 is at the highest position, the balance block 7 is at the lowest position, and the fixing member 6 is at the position closest to the first end of the crank 5 in the slideway 51 . With the rotation of the crank 5, the fixing member 6 can move in the slideway 51, so that the distance between the fixing member 6 and the first end of the crank 5 gradually increases, thereby increasing the stroke of the pumping unit gradually. 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 donkey head 3 drives the piston of the deep well pump to descend together through the polished rod and the sucker rod, the swimming valve in the piston is opened, the fixed valve at the lower end of the deep well pump is closed, and the oil under the piston passes through the swimming valve. , flows up the piston. Since the stroke of the pumping unit is gradually increased, the time for the piston to descend is increased. In this way, the pumping unit can make more oil flow over the piston, which can improve the filling degree of the deep well pump. When the upstroke begins, the donkey head 3 is at the lowest position, the balance weight 7 is at the highest position, and the fixing member 6 is at the farthest position from the first end of the crank 5 in the slideway 51 . With the rotation of the crank 5, the fixing member 6 can move in the slideway 51, so that the distance between the fixing member 6 and the first end of the crank 5 is gradually reduced, and thus the stroke of the pumping unit is gradually reduced. When the crank 5 rotates, the donkey head 3 and the piston of the deep well pump go up together, the swimming valve in the piston is closed, the fixed valve at the lower end of the deep well pump is opened, and the oil above the piston begins to discharge to the wellhead. Since the stroke of the pumping unit is gradually reduced, the time for the piston to ascend is shortened. In this way, the pumping unit can quickly discharge the oil in the deep well pump out of the wellhead, thereby reducing the amount of oil leakage during the discharge process.

In some embodiments, as shown in FIG. 2 , the inner wall of the slideway 51 may be provided with a needle roller bearing 52 , and the fixing member 6 may include a crank pin; one end of the crank pin passes through the needle roller bearing 52 and is limited in the 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.

Wherein, the slideway 51 may be an oval slideway 51 , and correspondingly, the shape of the bearing outer ring of the needle roller bearing 52 provided in the oval slideway 51 may also be an ellipse. Of course, the slideway 51 can also be an elongated slideway 51, and the shape of the bearing outer ring of the needle roller bearing 52 provided in the elongated slideway 51 can also be a stripe shape, which is not limited in the embodiment of the present application .

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

Wherein, a second connecting bearing can be provided on the end of the crank pin that is connected with the connecting rod 4, the inner ring of the bearing of the second connecting bearing can be fixedly connected with the end of the crank pin that is close to the connecting rod 4, and the bearing of the second connecting bearing The outer ring can be fixedly connected with the connecting rod 4 . In this way, the second connecting bearing can ensure 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 can be fixedly connected to the reinforcement housing, and the second end of the connecting rod 4 can be fixedly connected to the reinforcement housing. Strengthening the housing can not only ensure the firmness and connection strength of the connection between the connecting rod 4 and the bearing outer ring of the second connecting bearing, but also firmly limit the end of the crank pin connected with the connecting rod 4 to the first position of the crank 5. two sides.

The needle roller bearing 52 may include 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, the crank pin passes through the bearing outer ring, and is connected with the multiple cylindrical rollers. At least one of the cylindrical rollers contacts. In this way, when the crank pin moves in the needle roller bearing 52, the cylindrical roller on the inner wall of the bearing outer ring that is in contact with the crank pin can rotate relative to the crank pin, thereby reducing the impact of the crank pin during the movement process. friction, and enhance the flexibility of crank pin movement.

In some embodiments, the bearing outer ring of the needle roller bearing 52 can be fixedly connected with the slideway 51 with screws. For example, both the side wall of the bearing outer ring of the needle roller bearing 52 and the inner wall of the slideway 51 may be provided with half threaded holes, and the length direction of the threaded holes is perpendicular to the plane of the crank 5 . In this way, the screw can be screwed into the complete threaded hole formed by the outer ring of the bearing and the slideway 51 , so that the needle roller bearing 52 and the slideway 51 can be fixedly connected. Of course, the fixed connection between the needle roller bearing 52 and the slideway 51 may also be achieved in other ways, which is not limited in the embodiment of the present application.

It should be noted that the fixing method of fixing the needle roller bearing 52 by means of screws can facilitate the disassembly and replacement of the needle roller bearing 52. When the needle roller bearing 52 needs to be replaced, only the screws are removed, and then the needle roller bearing 52 is disassembled. Just come down.

Further, in order to protect the crankpin, a bushing can be installed on the crankpin. Wherein, the bushing can be sleeved on the crank pin, and the outer wall of the bushing can be in contact with the cylindrical roller of the needle bearing 52 . In this way, the bushing can protect the crankpin and avoid the wear caused by the direct contact and collision between the crankpin and the needle bearing 52 .

Wherein, the outer diameter of the bushing can be slightly smaller than the width of the needle roller bearing 52 , which can ensure the flexibility when the crankpin and the bushing move together in the needle roller bearing 52 .

In some embodiments, as shown in FIG. 1 , the included angle between the length direction of the slideway 51 and the length direction of the crank 5 may be an acute angle, so as to avoid the connecting rod when the crank 5 and the connecting rod 4 are located in a straight line. The rapid movement of the second end of 4 can further ensure the stability of the stroke change during the operation of the pumping unit.

For example, the included 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 can be ensured that the variation of the distance of the fixing member 6 relative to the first end of the crank 5 can be closer to the length of the slideway 51 , thereby ensuring a larger range of stroke variation. 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 the actual situation, which is not limited in the embodiment of the present application.

In other embodiments, the length direction of the slideway 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 in a straight line, the pumping unit may further include a cylinder 9 and a compression rod 101; the first end of the cylinder 9 is connected to the bracket 2 , the first end of the compression rod 101 extends into the second end of the cylinder 9 and is movably and sealedly connected with the cylinder 9 , and the second end of the compression rod 101 is rotatably connected with the beam 1 .

In this way, when the connecting part of the beam 1 and the compression rod 101 swings downward, the compression rod 101 can be moved toward the direction of the cylinder 9, and then the first end of the compression rod 101 will squeeze the gas in the cylinder 9, so that the cylinder 9 The gas inside compresses and stores energy. When the connecting part of the beam 1 and the compression rod 101 swings upward, the compression rod 101 can be moved away from the cylinder 9, and the compressed gas stored in the cylinder 9 can expand, and can exert a thrust on the compression rod 101, Further, a thrust force can be indirectly applied to the beam 1 through the compression rod 101 . In this way, the cylinder 9 and the compression rod 101 can assist the swing of the beam 1 and the operation of the pumping unit, thereby 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 beam 1, the stability of the beam 1 can be enhanced when it swings. When the crank 5 and the connecting rod 4 are in 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 close to the first end of the beam 1 , and correspondingly, the compression rod 101 may be close to the first end of the beam 1 . Of course, the first end of the cylinder 9 can also be disposed on the side of the bracket 2 close to the second end of the beam 1 , and correspondingly, the compression rod 101 can be close to the second end of the beam 1 .

In some embodiments, as shown in FIG. 1 , the pumping unit may further include a slider 92; the first end of the cylinder 9 is fixedly connected to the bracket 2, the slider 92 is slidably limited on the beam 1, and the compression rod The second end of 101 is rotatably connected to the slider 92 . In this way, the setting of the slider 92 can make the compression rod 101 adapt to the change of the angle of the beam 1 relative to the compression rod 101 and the change of the contact position between the compression rod 101 and the beam 1 when the beam 1 swings.

Wherein, the first end of the cylinder 9 can be welded on the bracket 2, and of course can also be fixedly connected to the bracket 2 in other ways, which is not limited in the embodiment of the present application. The sliding block 92 may be a roller, and correspondingly, the beam 1 may be provided with a raceway corresponding to the roller along the length direction. In this way, the roller can not only rotate relative to the compression rod 101 , but also move linearly relative to the beam 1 .

In other embodiments, the first end of the cylinder 9 can also be rotatably connected to the bracket 2, and the second end of the compression rod 101 can be rotatably connected to the beam 1. Of course, the second end of the compression rod 101 can also be rotatably connected to The rotatable sliding connection of the beam 1 is not limited in this embodiment of the present application. In this way, the direction of the cylinder 9 can be adjusted flexibly, and can adapt to the swing of the beam 1 in a wider range.

In some embodiments, as shown in FIG. 1 , the pumping unit may further include an air storage tank 91 , and the air storage tank 91 communicates with the cylinder 9 . In this way, the gas storage tank 91 can store more gas, so the gas can accumulate more energy when compressed, and the compressed gas can provide greater power to the compression rod 101 and the beam 1 .

In some embodiments, as shown in FIG. 1 , when the included angle between the length direction of the slideway 51 and the length direction of the crank 5 is an acute angle, the pumping unit may also include a cylinder 9 , a compression rod 101 and an air storage tank 91. The connection manner of the air cylinder 9, the compression rod 101 and the air storage tank 91 is the same as or similar to the above-mentioned embodiment, which is not repeated in the embodiment of the present application.

In some embodiments, as shown in FIG. 1 , the power system 8 may include an electric motor 81 and a reduction box 82 ; the power input end of the reduction box 82 is drivingly connected to the output shaft of the electric motor 81 , and the power output end of the reduction box 82 is connected to the crank 5 The first end of the rotatable connection. In this way, after the reduction box 82 achieves deceleration, more power can be output, and the crank 5 can be driven to rotate more smoothly. Among them, the reduction boxes 82 with different reduction ratios may be selected according to the actual situation, which is not limited in the embodiment of the present application.

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

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

It should be noted that the diameter of the first pulley can be smaller than the diameter of the second pulley, so that the high-speed rotation of the motor 81 can be converted into the low-speed rotation of the power input end of the reduction box 82, and then the power input end of the reduction box 82 and The transmission connection part of the electric motor 81 realizes the deceleration and torque increase of the power input end of the reduction box 82 . In this way, the power input end of the reduction box 82 can transmit greater power to the inside of the reduction box 82 , which facilitates the power transmission of the internal parts of the reduction box 82 , and is more conducive to realizing the deceleration function of the reduction box 82 .

In some embodiments, as shown in FIG. 1 , the power system 8 may further include a brake lever, which is mechanically connected to the reduction box 82 , and after the brake lever is tightened, the reduction box 82 can indirectly control the crank 5 to stop rotating. When the pumping unit needs to stop immediately and completely, the motor can be turned off first, and then the brake lever can be tightened, and then the brake lever can make the crank 5 stop rotating immediately after overcoming the inertial force. In this way, the brake lever avoids the consequence that the crank 5 cannot be stopped immediately due to the inertial force, thereby ensuring the safety of the pumping unit.

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

Wherein, 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 beam 1 can be fixedly connected with the connecting rod 4 , and the outer ring of the bearing can be connected with the second end of the beam 1 Fixed connection, of course, the first connection bearing 41 can also be connected with the connecting rod 4 and the beam 1 in other ways. The bearing inner ring of the first connecting bearing 41 located between the bracket 2 and the target part of the beam 1 can be fixedly connected with the bracket 2, and the bearing outer ring can be fixedly connected with the target part of the beam 1. Of course, the first connecting bearing 41 may also be connected to the bracket 2 and the beam 1 in other ways, which are not limited in the embodiment of the present application.

In the embodiment of the present application, the fixing member is limited in the slideway and can move along the length direction of the slideway, and the lengthwise direction of the slideway is not perpendicular to the length direction of the crank. When the fixing member moves along the lengthwise direction of the slideway, The distance between the fixing member and the first end of the crank can be changed, so that the swing amplitude of the connecting rod is changed. In this way, in the downstroke of the oil pumping unit, the stroke can be gradually longer, and in the upstroke of the oil pumping unit, the stroke can be gradually shortened. Due to the change of the stroke, the downward duration of the sucker rod connected with the polished rod is longer than the upward duration of the sucker rod, so that the sucker rod has enough time to recover to the original length when it is downward, thereby reducing the stroke loss. Further, when the sucker rod goes down, the down time of the piston of the deep well pump is prolonged, thereby increasing the flow rate of oil entering the top of the piston of the deep well pump, so that the filling degree of the deep well pump can be improved; when the sucker rod goes up, it shortens the time of the deep well pump. The up time of the piston is shortened, thereby reducing the oil leakage in the deep well pump, thereby improving the oil and gas production efficiency. Further, in one stroke of the pumping unit, the pumping unit can adjust the length of the stroke by itself, which ensures the smooth operation of the pumping unit and avoids the damage to the various equipment of the pumping unit caused by the instantaneous work of the power system. The cylinder and the compression rod can provide power to the beam, assist the swing of the beam and the operation of the pumping unit, and reduce the energy consumption and power output of the power system.

The above descriptions are only illustrative examples of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (10)

1. An oil pumping unit, characterized in that the oil pumping unit comprises: a beam (1), a bracket (2), a donkey head (3), a connecting rod (4), a crank (5), a fixing member ( 6), balance weight (7) and power system (8); The target part of the travel beam (1) is rotatably supported on the bracket (2), the first end of the travel beam (1) is fixedly connected with the donkey head (3), and the travel beam ( The second end of 1) is rotatably connected with the first end of the connecting rod (4), the donkey head (3) is used for fixed connection with the polished rod, and the target site refers to the position other than both ends; A slideway (51) is provided on the crank (5), the length direction of the slideway (51) is not perpendicular to the length direction of the crank (5), and the fixing member (6) is limited at the inside the slideway (51) and capable of moving along the length direction of the slideway (51), the second end of the connecting rod (4) is rotatably connected with the fixing member (6); The first end of the crank (5) is rotatably connected to the output shaft of the power system (8), the second end of the crank (5) is fixedly connected to the balance weight (7), and the power system (8) is used to drive the crank (5) to rotate along the output shaft of the power system (8). 2. The oil pumping unit according to claim 1, characterized in that, the inner wall of the slideway (51) is provided with a needle bearing (52), and the fixing member (6) comprises a crank pin; One end of the crank pin passes through the needle bearing (52) and is limited to the 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 is limited to the second side of the crank (5). 3. The oil pumping unit according to claim 1 or 2, characterized in that the included angle between the length direction of the slideway (51) and the length direction of the crank (5) is less than or equal to 15 degrees. 4. The oil pumping unit according to claim 1, characterized in that, the oil pumping unit further comprises a cylinder (9) and a compression rod (101); The first end of the air cylinder (9) is connected with the bracket (2), the first end of the compression rod (101) extends into the second end of the air cylinder (9), and is connected to the air cylinder (9) ) movable sealing connection, the second end of the compression rod (101) is rotatably connected with the travel beam (1). 5. The oil pumping unit according to claim 4, characterized in that, the oil pumping unit further comprises an air storage tank (91), and the air storage tank (91) communicates with the cylinder (9). 6. The oil pumping unit according to claim 4 or 5, characterized in that, the first end of the cylinder (9) is rotatably connected to the bracket (2). 7. The oil pumping unit according to claim 4 or 5, characterized in that, the oil pumping unit further comprises a sliding block (92); The first end of the cylinder (9) is fixedly connected with the bracket (2), the slider (92) is slidably limited on the beam (1), and the second end of the telescopic rod It is rotatably connected with the slider (92). 8. The oil pumping unit according to claim 1, characterized in that, the oil pumping unit further comprises a first connecting bearing (41), and the first end of the connecting rod (4) is connected to the beam (1) ) and between the bracket (2) and the target position of the beam (1) are rotatably connected by the first connecting bearing (41). 9. The oil pumping unit according to claim 1, wherein the power system (8) comprises an electric motor (81) and a reduction box (82); The power input end of the reduction box (82) is in driving connection with the output shaft of the electric motor (81), and the power output end of the reduction box (82) is rotatably connected with the first end of the crank (5). 10. The oil pumping unit according to claim 9, characterized in that, the power system (8) further comprises a transmission belt (83), and the output shaft of the electric motor (81) communicates with the transmission belt (83) through the transmission belt (83). The power input end of the reduction box (82) is connected.

Images