CA2580293C - An oil well pumping apparatus - Google Patents
An oil well pumping apparatus Download PDFInfo
- Publication number
- CA2580293C CA2580293C CA 2580293 CA2580293A CA2580293C CA 2580293 C CA2580293 C CA 2580293C CA 2580293 CA2580293 CA 2580293 CA 2580293 A CA2580293 A CA 2580293A CA 2580293 C CA2580293 C CA 2580293C
- Authority
- CA
- Canada
- Prior art keywords
- walking beam
- counter
- weight
- oil well
- pumping apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Reciprocating Pumps (AREA)
Abstract
The present invention relates to an oil well pumping apparatus, comprising a power device; a crank arm connected to the power device via a transmission device, said crank arm is rotatable around a fixed axis at one end thereof; a crank counter-weight mounted to the crank arm and spaced from said fixed axis; a walking beam pivotally supported by a bearing and comprising a first part and a second part connected to each other; a walking beam counter-weight mounted to the walking beam; and a link pivotally connected to the crank arm at one end thereof, and pivotally connected to the walking beam at the other end thereof; wherein the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam
Description
AN OIL WELL PUMPING APPARATUS
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention The present invention relates to a novel and improved oil well pumping apparatus.
(b) Description of the Prior Art A sucker rod pump has been widely used in the oil and gas industry. The pump is placed at the bottom of the downhole tubing system, and is connected to an oil well pumping apparatus on the ground surface by a series of sucker rods and flexible cables. The oil pumping apparatus moves the sucker rods up and down, so as to actuate the pump and then move oil upward.
The oil well pumping apparatus comprises a prime mover coupled to a pair of crank arms via a reducer. The crank arm each rotates around a fixed axis at one end thereof. A counter-weight is mounted at the free end of each crank arm. A
link, at one end, is pivotally connected between the free end and the fixed end of the crank arm, and is connected to a walking beam at the other end thereof. The walking beam supported by a walking beam mount can pivotally rotate about a bearing provided at the upper end of the walking beam mount. A four-link mechanism, substantially formed by the crank arm, the link and the walking beam, connects the reducer with the walking beam. A horsehead is mounted at the front end of the walking beam in order to allow a flexible cable to be connected to a sucker rod extending from the horsehead downward into the well, and to be connected to the pump via the sucker rod.
The walking beam in a conventional pumping apparatus is in the form of one piece with a relatively long length and heavy weight, which causes inconvenience in packaging, transportation and installation of the oil well pumping apparatus.
Furthermore, the conventional oil well pumping apparatus balances the load torque acting on the crank by a suspending point load via the walking beam counter-weight and the crank arm counter-weight. However, it is difficult to keep the balance well, which causes the significant difference between the peak value and the valley value of the torque required for driving the crank arm, and the valley value is negative. Thus, the efficiency of the oil well pumping apparatus is reduced, and lifespan of the reducer is affected adversely. Especially, as the suspending point load sustained is different when the oil pumping apparatus is installed in different oil wells, it is difficult for one same model of oil well pumping apparatus to be applied for various oil wells. Furthermore, even though the oil well pumping apparatus has been mounted at a certain oil well and adjusted to a balance state, however, it will come to unbalance due to the change of the condition of the oil well after a period of time of operation.
Therefore, it is necessary to provide an oil well pumping apparatus which can be adjusted to a balance state in a quick and simple way.
SUMARY OF THE INVENTION
It is an object of the present invention to provide an oil well pumping apparatus which is convenient for packaging, transportation and installation.
It is a further object of the present invention to provide an oil wel.l pumping apparatus which can optimize the net output torque of the crank arm, in order to reduce the difference between the peak and valley values of the torque required for driving the crank arm, and to improve the energy efficiency of the oil well pumping apparatus.
It is a further object of the present invention to provide an oil well pumping apparatus which can be easily adjusted to a balance state according to a particular condition of an oil well in order to achieve one type of oil well pumping apparatus being suitable for various oil wells.
The oil well pumping apparatus according to the present invention comprises: a power device; a crank arm connected to the power device via a transmission device, said crank arm is rotatable around a fixed axis at one end thereof; a crank counter-weight mounted on the crank arm and spaced from said fixed axis, a walking beam pivotally supported by a bearing and comprising a first part and a second part connected to each other; a walking beam counter-weight mounted to the walking beam, and; a link pivotally connected to the crank arm at one end thereof, and pivotally connected to the walking beam at the other end thereof; wherein the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam.
Preferably, the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam.
Preferably, the first part pivotally connected to the bearing is provided with at least two slots or a plurality of through holes or screwed. holes, and the second part pivotally connected to the link is provided with a plurality of through holes for connecting to the first part, the first part is connected to the second part by means of bolts.
Preferably, a screw rod - nut mechanism is mounted between the first part and the second part for adjusting the location of the first part relative to the second part.
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention The present invention relates to a novel and improved oil well pumping apparatus.
(b) Description of the Prior Art A sucker rod pump has been widely used in the oil and gas industry. The pump is placed at the bottom of the downhole tubing system, and is connected to an oil well pumping apparatus on the ground surface by a series of sucker rods and flexible cables. The oil pumping apparatus moves the sucker rods up and down, so as to actuate the pump and then move oil upward.
The oil well pumping apparatus comprises a prime mover coupled to a pair of crank arms via a reducer. The crank arm each rotates around a fixed axis at one end thereof. A counter-weight is mounted at the free end of each crank arm. A
link, at one end, is pivotally connected between the free end and the fixed end of the crank arm, and is connected to a walking beam at the other end thereof. The walking beam supported by a walking beam mount can pivotally rotate about a bearing provided at the upper end of the walking beam mount. A four-link mechanism, substantially formed by the crank arm, the link and the walking beam, connects the reducer with the walking beam. A horsehead is mounted at the front end of the walking beam in order to allow a flexible cable to be connected to a sucker rod extending from the horsehead downward into the well, and to be connected to the pump via the sucker rod.
The walking beam in a conventional pumping apparatus is in the form of one piece with a relatively long length and heavy weight, which causes inconvenience in packaging, transportation and installation of the oil well pumping apparatus.
Furthermore, the conventional oil well pumping apparatus balances the load torque acting on the crank by a suspending point load via the walking beam counter-weight and the crank arm counter-weight. However, it is difficult to keep the balance well, which causes the significant difference between the peak value and the valley value of the torque required for driving the crank arm, and the valley value is negative. Thus, the efficiency of the oil well pumping apparatus is reduced, and lifespan of the reducer is affected adversely. Especially, as the suspending point load sustained is different when the oil pumping apparatus is installed in different oil wells, it is difficult for one same model of oil well pumping apparatus to be applied for various oil wells. Furthermore, even though the oil well pumping apparatus has been mounted at a certain oil well and adjusted to a balance state, however, it will come to unbalance due to the change of the condition of the oil well after a period of time of operation.
Therefore, it is necessary to provide an oil well pumping apparatus which can be adjusted to a balance state in a quick and simple way.
SUMARY OF THE INVENTION
It is an object of the present invention to provide an oil well pumping apparatus which is convenient for packaging, transportation and installation.
It is a further object of the present invention to provide an oil wel.l pumping apparatus which can optimize the net output torque of the crank arm, in order to reduce the difference between the peak and valley values of the torque required for driving the crank arm, and to improve the energy efficiency of the oil well pumping apparatus.
It is a further object of the present invention to provide an oil well pumping apparatus which can be easily adjusted to a balance state according to a particular condition of an oil well in order to achieve one type of oil well pumping apparatus being suitable for various oil wells.
The oil well pumping apparatus according to the present invention comprises: a power device; a crank arm connected to the power device via a transmission device, said crank arm is rotatable around a fixed axis at one end thereof; a crank counter-weight mounted on the crank arm and spaced from said fixed axis, a walking beam pivotally supported by a bearing and comprising a first part and a second part connected to each other; a walking beam counter-weight mounted to the walking beam, and; a link pivotally connected to the crank arm at one end thereof, and pivotally connected to the walking beam at the other end thereof; wherein the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam.
Preferably, the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam.
Preferably, the first part pivotally connected to the bearing is provided with at least two slots or a plurality of through holes or screwed. holes, and the second part pivotally connected to the link is provided with a plurality of through holes for connecting to the first part, the first part is connected to the second part by means of bolts.
Preferably, a screw rod - nut mechanism is mounted between the first part and the second part for adjusting the location of the first part relative to the second part.
Preferably, the first part and the second part are straight.
Preferably, the walking beam counter-weight is connected to the walking beam via a support member adapted to be arranged at a plurality of positions on the second part of the walking beam in a direction parallel to the longitudinal axis of the walking beam.
Preferably, the support member is provided with a plurality of positions for the walking beam counter-weight to be mounted.
According to the oil well pumping apparatus of the present invention, the walking beam is divided into at least two parts, as a result, the weight and length of each part is reduced, and thus it significantly contributes to the convenience of packaging, transportation and installation of the oil well pumping apparatus.
In addition, the oil well pumping apparatus is adjusted after being manufactured and even after a period of time of operation, in order to reduce the difference between the peak value and the valley value of torque required for driving the crank, and thus further improve the efficiency of the oil well pumping apparatus.
BRIEF DESCRIPTION OF THE DRAVJING
The details of the invention will be described in connection with the accompanying drawings, in which:
Fig. 1 is a schematic view of the oil well pumping apparatus according to the present invention, Fig. 2 is a schematic view of a support member of the walking beam counter-weight shown in Fig 1, Fig. 3 is a schematic view of the support member shown in Fig. 1, as viewed in another direction.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Fig. 1, the oil well pumping apparatus comprises a power device, such as a motor, connected to a crank arm 8 rotating around a fixed axis at one end thereof via a belt and a gear reducer ; a crank counter-weight 9 mounted to the free end of the crank arm 8; a link 7 pivotally connected to the crank arm 8 between the free end and the fixed end thereof; and a walking beam 1 connected to the other end of the link 7; a walking beam mount 4 supporting the walking beam I in such a way that the walking beam 1 can pivotally rotate around a bearing 10 arranged at the upper end of the walking beam mount 4; a horsehead 2 mounted on the front end of the walking beam 1; the walking beam I comprises a first part 11 connected to the horsehead 2, and a second part 12 connected to the walking beam counter-weight 6.
The centroid of the walking beam counter-weight 6 is laterally offset away from the axis 5 of the walking beam 1, in a direction parallel to the plane shown in Fig.l and perpendicular to the axis of the walking beam 1. At the start of the upward stroke and at the end of the downward stroke, the walking beam counter-weight 6 swings to a position adjacent to its highest position, where the gravity force of the walking beam counter-weight 6 has a relatively long arm of force in respect to the bearing, i.e., the counter-weight 6 has a greater balance torque so as to balance the greater suspending point load well at this time. At the end of the upward stroke and at the start of the downward stroke, the walking beam counter-weight 6 swings to a position adjacent to its lowest position, where the gravity force of the walking beam counter-weight 6 has a relatively short arm of force in respect to the bearing, i.e., the counter-weight 6 has a smaller balance torque so as to balance the smaller suspending point load well at this time. Thus, it improves the balance as to the suspending point load, and contributes to reducing the difference between the peak value and the valley value of the suspending point load, and therefore improves the balance and increases the energy efficiency.
As shown in Fig. 1, the first part 11 and the second part 12 are securely interconnected by means of bolts. The length of the first part 11 and the second part 12 each is much less than that of the walking beam as a whole, and the weight of the first part 11 and the second part 12 each is much less than that of the walking beam as a whole. It is quite advantageous for transportation of the walking beam in a long distance and installation of the oil well pumping apparatus in the field.
According to a preferred embodiment of the present invention, the second part 12 of the walking beam 1 is provided with a plurality of through holes for screwed connection to the first part 11. The first part 11 is provided with a plurality of screwed holes arranged in a direction parallel to the axis of the walking beam 1. The second part 12 is mounted to the first part 11 at different axial positions by screwing the bolts passing through the through holes of the first part 12 into different screw holes of the first part 11. Alternatively, the same technical effect can be achieved by providing slots or through holes on the first part.
Similarly, the crank arm counter-weight 9 may be arranged so that its centroid can be adjusted relative to the axis of the crank arm 8.
As the second part 12 is connected to the walking beam counter-weight 6, the change of the axial positions of the second part 12 relative to the first part 11 results in the change of the axial positions of the walking beam counter-weight 6 relative to the walking beam 1, and thus adjusts the amplitude and phase of the balance torque generated by the walking beam counter-weight 6. At the same time, as the second part 12 is pivotally connected to the link 7, the change of the axial positions of the second part 12 relative to the first part 11 results in the change of the distance between the walking beam bearing 10 and the point at which the link 7 is pivotally connected to the second part 12, and thus the length of one arm of the four-link mechanism is changed, causing the change of the load torque acting on the crank arm 8 by the suspending point load via the four-bar mechanism.
Preferably, the walking beam counter-weight is connected to the walking beam via a support member adapted to be arranged at a plurality of positions on the second part of the walking beam in a direction parallel to the longitudinal axis of the walking beam.
Preferably, the support member is provided with a plurality of positions for the walking beam counter-weight to be mounted.
According to the oil well pumping apparatus of the present invention, the walking beam is divided into at least two parts, as a result, the weight and length of each part is reduced, and thus it significantly contributes to the convenience of packaging, transportation and installation of the oil well pumping apparatus.
In addition, the oil well pumping apparatus is adjusted after being manufactured and even after a period of time of operation, in order to reduce the difference between the peak value and the valley value of torque required for driving the crank, and thus further improve the efficiency of the oil well pumping apparatus.
BRIEF DESCRIPTION OF THE DRAVJING
The details of the invention will be described in connection with the accompanying drawings, in which:
Fig. 1 is a schematic view of the oil well pumping apparatus according to the present invention, Fig. 2 is a schematic view of a support member of the walking beam counter-weight shown in Fig 1, Fig. 3 is a schematic view of the support member shown in Fig. 1, as viewed in another direction.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Fig. 1, the oil well pumping apparatus comprises a power device, such as a motor, connected to a crank arm 8 rotating around a fixed axis at one end thereof via a belt and a gear reducer ; a crank counter-weight 9 mounted to the free end of the crank arm 8; a link 7 pivotally connected to the crank arm 8 between the free end and the fixed end thereof; and a walking beam 1 connected to the other end of the link 7; a walking beam mount 4 supporting the walking beam I in such a way that the walking beam 1 can pivotally rotate around a bearing 10 arranged at the upper end of the walking beam mount 4; a horsehead 2 mounted on the front end of the walking beam 1; the walking beam I comprises a first part 11 connected to the horsehead 2, and a second part 12 connected to the walking beam counter-weight 6.
The centroid of the walking beam counter-weight 6 is laterally offset away from the axis 5 of the walking beam 1, in a direction parallel to the plane shown in Fig.l and perpendicular to the axis of the walking beam 1. At the start of the upward stroke and at the end of the downward stroke, the walking beam counter-weight 6 swings to a position adjacent to its highest position, where the gravity force of the walking beam counter-weight 6 has a relatively long arm of force in respect to the bearing, i.e., the counter-weight 6 has a greater balance torque so as to balance the greater suspending point load well at this time. At the end of the upward stroke and at the start of the downward stroke, the walking beam counter-weight 6 swings to a position adjacent to its lowest position, where the gravity force of the walking beam counter-weight 6 has a relatively short arm of force in respect to the bearing, i.e., the counter-weight 6 has a smaller balance torque so as to balance the smaller suspending point load well at this time. Thus, it improves the balance as to the suspending point load, and contributes to reducing the difference between the peak value and the valley value of the suspending point load, and therefore improves the balance and increases the energy efficiency.
As shown in Fig. 1, the first part 11 and the second part 12 are securely interconnected by means of bolts. The length of the first part 11 and the second part 12 each is much less than that of the walking beam as a whole, and the weight of the first part 11 and the second part 12 each is much less than that of the walking beam as a whole. It is quite advantageous for transportation of the walking beam in a long distance and installation of the oil well pumping apparatus in the field.
According to a preferred embodiment of the present invention, the second part 12 of the walking beam 1 is provided with a plurality of through holes for screwed connection to the first part 11. The first part 11 is provided with a plurality of screwed holes arranged in a direction parallel to the axis of the walking beam 1. The second part 12 is mounted to the first part 11 at different axial positions by screwing the bolts passing through the through holes of the first part 12 into different screw holes of the first part 11. Alternatively, the same technical effect can be achieved by providing slots or through holes on the first part.
Similarly, the crank arm counter-weight 9 may be arranged so that its centroid can be adjusted relative to the axis of the crank arm 8.
As the second part 12 is connected to the walking beam counter-weight 6, the change of the axial positions of the second part 12 relative to the first part 11 results in the change of the axial positions of the walking beam counter-weight 6 relative to the walking beam 1, and thus adjusts the amplitude and phase of the balance torque generated by the walking beam counter-weight 6. At the same time, as the second part 12 is pivotally connected to the link 7, the change of the axial positions of the second part 12 relative to the first part 11 results in the change of the distance between the walking beam bearing 10 and the point at which the link 7 is pivotally connected to the second part 12, and thus the length of one arm of the four-link mechanism is changed, causing the change of the load torque acting on the crank arm 8 by the suspending point load via the four-bar mechanism.
According to a further embodiment of the invention, a screw rod - nut mechanism is provided between the first part 11 and the second part 12 for adjusting their relative axial position. For example, the screw rod is securely fixed to the first part 11, and the nut cooperating with the screw rod is securely fixed to the second part 12. There are screws passing through the through holes in the second part 12, and then passing through the longitudinal slots arranged in the first part 11, parallel to the axis of the walking beam. The nuts are securely fastened at the ends of the screws so that the second part 12 is securely fixed to the first part 11. When it is required to adjust the axial position of the second part 12 relative to the first part 11, the nuts can be properly loosened so that the second part 12 can longitudinally move relative to the first part 11 , and then rotates the screw rod to adjust the second part 12 reaching the desired axial position, and then tightly screws the nuts to securely fixed the second part 12 to the first part 11 of the walking beam 1.
As shown in Fig. 1, the first part 11 and the second part 12 each is straight and can be manufactured easily, for example, made of bar section such as H-shaped steel.
A walking beam counter-weight support member 14 extending downwardly is mounted at the rear of the second part 12. Because the second part 12 of the walking beam 1 is provided with a plurality of rows of through holes or screwed holes (7 rows are shown in the Fig. 2, as indicated by dashed lines), the support member 14 can be mounted to the second part 12 at a plurality of positions in the axial direction of the walking beam 1(for example, as shown in Fig. 2, four different positions). The walking beam counter-weight 6 mounted to the support member 14 comprises a plurality of counter-weight pieces 13. The counter-weight pieces 13 each has a disc-shape with a central hole, and is connected to the second part 12 of the walking beam 1 by means of a pin 15 passing through the support member 14. The support member 14 can be provided with a plurality of through holes for the pin 15 passing through, so as to change the longitudinal and lateral positions of the centroid of the walking beam counter-weight 6 in a direction parallel to the plane shown in Fig. 2 and perpendicular to the axis of the walking beam by adjusting the position of the pin 15.
The counter-weight pieces 13 each may have other shapes, such as quadrate, rectangle and the like. The counter-weight pieces 13 may also be connected to the second part 12 of the walking beam 1 by other means, for example, being connected to the support member 14 via two pins 15, or being directly connected to the walking beam 1.
When it is required to adjust the oil well pumping apparatus of the present invention to balance the torque acting on the crank arm 8 by the suspending point load, it is possible to adjust the axial position of the second part 12 relative to the first part 11, the axial position and the lateral position of the centroid of the walking beam counter-weight 6 relative to the second part 12, the deviation angle of the crank arm counter-weight 6 relative to the crank arm 8, and the distance of the crank arm counter-weight 6 relative to the rotation axis of the crank arm 8.
As shown in Fig. 1, the first part 11 and the second part 12 each is straight and can be manufactured easily, for example, made of bar section such as H-shaped steel.
A walking beam counter-weight support member 14 extending downwardly is mounted at the rear of the second part 12. Because the second part 12 of the walking beam 1 is provided with a plurality of rows of through holes or screwed holes (7 rows are shown in the Fig. 2, as indicated by dashed lines), the support member 14 can be mounted to the second part 12 at a plurality of positions in the axial direction of the walking beam 1(for example, as shown in Fig. 2, four different positions). The walking beam counter-weight 6 mounted to the support member 14 comprises a plurality of counter-weight pieces 13. The counter-weight pieces 13 each has a disc-shape with a central hole, and is connected to the second part 12 of the walking beam 1 by means of a pin 15 passing through the support member 14. The support member 14 can be provided with a plurality of through holes for the pin 15 passing through, so as to change the longitudinal and lateral positions of the centroid of the walking beam counter-weight 6 in a direction parallel to the plane shown in Fig. 2 and perpendicular to the axis of the walking beam by adjusting the position of the pin 15.
The counter-weight pieces 13 each may have other shapes, such as quadrate, rectangle and the like. The counter-weight pieces 13 may also be connected to the second part 12 of the walking beam 1 by other means, for example, being connected to the support member 14 via two pins 15, or being directly connected to the walking beam 1.
When it is required to adjust the oil well pumping apparatus of the present invention to balance the torque acting on the crank arm 8 by the suspending point load, it is possible to adjust the axial position of the second part 12 relative to the first part 11, the axial position and the lateral position of the centroid of the walking beam counter-weight 6 relative to the second part 12, the deviation angle of the crank arm counter-weight 6 relative to the crank arm 8, and the distance of the crank arm counter-weight 6 relative to the rotation axis of the crank arm 8.
Claims (6)
1. An oil well pumping apparatus, comprising a power device, a crank arm connected to the power device via a transmission device, said crank arm is rotatable around a fixed axis at one end thereof, a crank counter-weight mounted to the crank arm and spaced from said fixed axis, a walking beam pivotally supported by a bearing and comprising a first part and a second part connected to each other, a walking beam counter-weight mounted to the walking beam, and a link, pivotally connected to the crank arm at one end thereof and pivotally connected to the walking beam at the other end thereof, wherein the centroid of the walking beam counter-weight is offset away from a longitudinal axis of the walking beam.
2. An oil well pumping apparatus as cited in Claim 1, wherein the first part pivotally connected to the bearing is provided with at least two slots or a plurality of through holes or screwed holes, and the second part pivotally connected to the link is provided with a plurality of through holes for connecting to the first part, the first part is connected to the second part by means of bolts.
3. An oil well pumping apparatus as cited in Claim 2, wherein a screw rod -nut mechanism is mounted between the first part and the second part for adjusting the position of the first part relative to the second part.
4. An oil well pumping apparatus as cited in Claim 1, wherein the first part and the second part are straight.
5. An oil well pumping apparatus as cited in Claim 1, wherein the walking beam counter-weight is connected to the walking beam via a support member adapted to be selectively arranged at a plurality of positions on the walking beam in a direction parallel to the longitudinal axis of the walking beam.
6. An oil well pumping apparatus as cited in Claim 5, wherein the support member is provided with a plurality of positions for the walking beam counter-weight to be mounted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620003798 CN2890412Y (en) | 2006-03-08 | 2006-03-08 | Pumping device for oil well |
| CN200620003798.6 | 2006-03-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2580293A1 CA2580293A1 (en) | 2007-09-08 |
| CA2580293C true CA2580293C (en) | 2009-12-15 |
Family
ID=38021072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2580293 Expired - Fee Related CA2580293C (en) | 2006-03-08 | 2007-03-05 | An oil well pumping apparatus |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN2890412Y (en) |
| CA (1) | CA2580293C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619491B (en) * | 2012-04-17 | 2015-10-28 | 江苏中油天工机械有限公司 | Oil pumper operating maintenance device |
| US10408200B2 (en) | 2015-03-19 | 2019-09-10 | Yanan Liu | Flexible beam vertical pumping unit |
-
2006
- 2006-03-08 CN CN 200620003798 patent/CN2890412Y/en not_active Expired - Fee Related
-
2007
- 2007-03-05 CA CA 2580293 patent/CA2580293C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN2890412Y (en) | 2007-04-18 |
| CA2580293A1 (en) | 2007-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9885349B2 (en) | Pumping unit and counterbalance system for pumping units | |
| US10094368B2 (en) | Tower drive pumping unit | |
| US10947825B1 (en) | Head with contiguous counterweight dampers on structure | |
| US9157431B2 (en) | Counterbalance system for pumping units | |
| US5105671A (en) | Well pumping unit with adjustable balance beam | |
| CA2580293C (en) | An oil well pumping apparatus | |
| EA012103B1 (en) | Mechanical drive of well pumps | |
| US8083622B1 (en) | Systems and methods for automatic belt tensioning in low speed, low volume fluid recovery operations | |
| JP3919216B2 (en) | Drive assembly | |
| CN100513739C (en) | Differential balance pressure oil-pumping unit | |
| WO2020205270A1 (en) | Pumping unit having zero-imbalanced beam, lagging counterweights, and setback crank point | |
| CN201771472U (en) | Hydraulic pumping unit | |
| CN104763384A (en) | Oscillating bar tower type intelligent oil pumping unit | |
| CN207131382U (en) | Self-adapting flexible is driven beam pumping unit | |
| CA2322407C (en) | Curved-beam pumping unit | |
| US10941761B2 (en) | Rear leg connection for beam pumping unit | |
| CN107191162A (en) | Self-adapting flexible is driven beam pumping unit | |
| RU2661113C1 (en) | Beamless pumping unit driven by a biaxial engine | |
| CN113236187A (en) | Oil pumping machine | |
| CN201391287Y (en) | Beam type automatic torque-changing balance oil pumping machine | |
| CN201391288Y (en) | Front-mounted beam type automatic torque-changing balance oil pumping machine | |
| EP0125304A1 (en) | Low profile pump jack | |
| CN2858943Y (en) | Differential balance pressure oil pump | |
| CN201262070Y (en) | Hydraulic oil-pumping unit | |
| CN219412554U (en) | Crank connecting rod flexible transmission pumping unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130305 |