CN111173478A - Intelligent oil pumping unit - Google Patents
Intelligent oil pumping unit Download PDFInfo
- Publication number
- CN111173478A CN111173478A CN202010196362.8A CN202010196362A CN111173478A CN 111173478 A CN111173478 A CN 111173478A CN 202010196362 A CN202010196362 A CN 202010196362A CN 111173478 A CN111173478 A CN 111173478A
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- China
- Prior art keywords
- wire rope
- spiral groove
- steel wire
- winding drum
- pumping unit
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
Abstract
the invention belongs to the technical field of oil extraction devices in oil fields, and particularly relates to an intelligent oil pumping unit which comprises a base, a support, a guide wheel, a winding drum, a steel wire rope, an oil well pump and a motor, wherein a spiral groove for accommodating the steel wire rope is formed in the outer wall of the winding drum, the winding drum is obliquely arranged, the relationship between an acute angle α formed by the axis of the winding drum and the steel wire rope and a helix angle β of the spiral groove is α -90- β, the winding drum structurally comprises a drum body, a driving shaft, a thread supporting shaft and a shaft support, one end of the drum body is connected with the driving shaft through a spline, and the other end of the drum body is connected with the thread supporting shaft through a transmission thread.
Description
Technical Field
The invention belongs to the field of oil extraction devices in oil fields, and particularly relates to an intelligent oil pumping unit.
Background
The pumping unit is an important oil extraction device, and has been widely used in oil field production around the world for a long time, and the oil extraction efficiency of the pumping unit oil extraction system is mainly determined by the oil well pump. At present, the pumping unit widely adopted is mostly a beam pumping unit, and because of the limitation of a ground pumping mechanism, the stroke of the pumping unit is short, so that the problem of low oil extraction efficiency is caused. In order to improve the oil extraction efficiency, technicians develop a bailing type oil pumping unit based on an intelligent control system, the oil pumping unit adopts a motor-driven winding drum as a power source, and oil pumping is realized by drawing a plunger of an underground oil pumping pump through a steel wire rope. However, in the present phase, the bailing pumping unit is still in the primary phase of technical application, and there are problems of fast abrasion of the steel wire rope, high power requirement on the motor, inconvenient construction operation in the well site, and the like in the using process, so it is necessary to optimize the structure of the conventional bailing pumping unit to solve the above problems.
Disclosure of Invention
The invention provides an intelligent oil pumping unit, which aims to solve the problems in the background technology.
the invention provides an intelligent oil pumping unit, which comprises a base, a support, a guide wheel, a winding drum, a steel wire rope, an oil well pump, a motor and an intelligent variable frequency controller for controlling the motor, wherein the support is fixedly arranged on the base, the guide wheel is arranged at the top end of the support, the winding drum and the motor are fixedly arranged on the base, the winding drum is driven by the motor to rotate, one end of the steel wire rope is wound on the winding drum, the other end of the steel wire rope is connected with the oil well pump after passing through the upper side of the guide wheel, a spiral groove for accommodating the steel wire rope is arranged on the outer wall of the winding drum, the winding drum is obliquely arranged, and the relationship between an acute angle α formed by the axis of the winding drum and the steel wire rope and a spiral lifting angle β of the spiral groove;
the winding drum structurally comprises a drum body, a driving shaft, a thread supporting shaft and a shaft support, wherein one end of the drum body is connected with the driving shaft through a spline, the other end of the drum body is connected with the thread supporting shaft through a transmission thread, the drum body is installed on the shaft support through the driving shaft and the thread supporting shaft, and the driving shaft rotates under the driving of a motor, so that the winding drum is driven.
As a further technical scheme, the structure of the bracket comprises a vertical rod and an inclined rod, the lower end of the inclined rod is hinged on the base, the guide wheel is installed at the upper end of the inclined rod through a guide wheel installation shaft, the lower end of the vertical rod is hinged on the base, the upper end of the vertical rod is provided with a notch for accommodating the guide wheel installation shaft, and the upper end of the inclined rod is fixed above the vertical rod through the matching of the guide wheel installation shaft and the notch;
when the vertical rod is located at the upper limit position, the vertical rod is in a vertical state.
As a further technical scheme, the structure of support includes montant, first connecting rod, second connecting rod and screw thread telescopic link, and the lower extreme of montant articulates on the base, the guide pulley is installed in the upper end of montant, the upper end of first connecting rod links to each other with the upper end of montant is articulated, and the lower extreme of first connecting rod links to each other with the upper end of second connecting rod is articulated, and the lower extreme of second connecting rod articulates on the base, the one end of screw thread telescopic link articulates on the tie point between first connecting rod and the second connecting rod, and the other end of screw thread telescopic link articulates on the base.
As a further technical scheme, the whole barrel is cylindrical, and the spiral groove is coiled along the cylindrical surface outside the barrel.
as a further technical scheme, a section where the spiral groove is located on the cylinder body is of a cylindrical structure, and an included angle between the axis of the cylindrical section and the axis of the driving shaft is equal to twice of a spiral lead angle β of the spiral groove.
As a further technical scheme, the section of the cylinder body where the spiral groove is located is of a conical structure, the axis of the conical section is overlapped with the axis of the cylinder body, and the connecting point of the steel wire rope and the cylinder body is located at the small-diameter end of the conical section.
As a further technical scheme, the section of the cylinder body where the spiral groove is located is of a drum-shaped structure with two thick ends and a thin middle part, and the axis of the section is superposed with the axis of the cylinder body.
As a further technical scheme, the pitch of the spiral groove is not less than 1.5 times of the diameter of the steel wire rope.
The invention has the beneficial effects that:
1. among the prior art, wire rope's wearing and tearing mainly take place in reel department, and specific wearing and tearing reason has two: on one hand, in the process of winding the steel wire rope on the winding drum, friction exists between the steel wire rope to be wound on the winding drum and the steel wire rope already wound on the winding drum, and the steel wire rope is abraded; on the other hand, in order to wind the steel wire rope on the drum regularly and orderly, some drums are provided with a spiral groove for accommodating the steel wire rope, but because the axis of the steel wire rope of the drum is vertical, the steel wire rope inevitably rubs the side wall of the spiral groove when winding on the drum, thereby causing abrasion of the steel wire rope.
In the invention, the steel wire rope to be wound on the winding drum can be effectively prevented from contacting with the steel wire rope already wound on the winding drum by arranging the spiral groove with the large pitch, so that the abrasion of the steel wire rope is reduced. Meanwhile, the friction on the side wall of the spiral groove in the process of winding the steel wire rope is greatly reduced by obliquely arranging the winding drum, so that the abrasion of the steel wire rope is further reduced, and the service life of the steel wire rope is prolonged.
2. In order to align the steel wire rope with the spiral groove all the time, the invention is provided with a corresponding barrel supporting structure to enable the winding drum to axially move while rotating, and the steel wire rope cannot swing in the rotation process of the winding drum by adjusting the proportional relation between the thread pitch of the threads on the thread supporting shaft 13 and the thread pitch of the spiral groove 16, so that the steel wire rope is aligned with the spiral groove all the time, and the abrasion of the steel wire rope at the winding drum is reduced to the minimum. In addition, the structure also reduces the abrasion of the steel wire rope at the guide wheel.
3. By designing the movable support structure, the invention can realize the abdication of the well site during operation by manpower under the condition of not starting a crane, thereby effectively improving the convenience of construction and simultaneously reducing the construction cost.
4. based on the design, the inclination of the cylinder body and the inclination of the cylindrical section in which the spiral groove is located can be mutually offset in the axial moving process of the cylinder body, so that the winding and unwinding speed of the steel wire rope is more uniform and more stable, and the stability of the operation of an oil pumping system is improved.
5. When the bailing type oil pumping unit works, at the moment when the plunger of the oil pumping pump moves upwards from the lower limit position, the power of the motor needs to overcome the gravity of the oil pumping rod and the gravity of well fluid and provide the acceleration at the moment when the plunger of the oil pumping pump moves upwards from the lower limit position, so that the load of the motor is extremely large at the moment when the plunger of the oil pumping pump moves upwards from the lower limit position, and the requirements on the power and the reliability of the motor are very high.
In the invention, the section where the spiral groove is located on the cylinder body can adopt the following structure: the section where the spiral groove is located is of a conical structure, the axis of the conical section is overlapped with the axis of the cylinder, and the connecting point of the steel wire rope and the cylinder is located at the small-diameter end of the conical section. Through adopting this kind of structure, at the initial stage of oil pump plunger from lower extreme position upward movement, wire rope is less at the winding diameter on the reel, and at this moment, the motor only needs to provide less drive power can make wire rope possess sufficient traction force, simultaneously, along with the increase of winding diameter, motor load can smooth transition. Therefore, the invention can effectively reduce the requirement on the power of the motor, reduce the cost of the motor and simultaneously effectively improve the running stability of the oil pumping mechanism.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention when another stent structure is used;
FIG. 3 is a diagram showing the position relationship of the guide pulley, the wire rope and the drum after being projected downward on a horizontal plane;
FIG. 4 is a schematic structural view of one embodiment of a spool;
FIG. 5 is a schematic sectional view of the spool;
FIG. 6 is a schematic structural view of a second embodiment of the spool;
FIG. 7 is a schematic structural view of a third embodiment of the spool;
fig. 8 is a partially enlarged view of a portion a in fig. 1.
In the figure, 1-base, 2-guide wheel, 3-winding drum, 4-steel wire rope, 5-oil pump, 6-vertical rod, 7-diagonal rod, 8-first connecting rod, 9-second connecting rod, 10-shaft bracket, 11-driving shaft, 12-cylinder, 13-threaded supporting shaft, 14-guide wheel mounting shaft, 15-gap, 16-spiral groove and 17-threaded telescopic rod.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the embodiment includes a base 1, a bracket, a guide wheel 2, a winding drum 3, a steel wire rope 4, an oil-well pump 5, a motor (not shown in the figure) and an intelligent frequency-variable controller (not shown in the figure) for controlling the motor, the bracket is fixedly mounted on the base 1, the guide wheel 2 is mounted on the top end of the bracket, the winding drum 3 and the motor are fixedly mounted on the base 1, the winding drum 3 is driven by the motor to rotate, one end of the steel wire rope 4 is wound on the winding drum 3, and the other end of the steel wire rope is connected with the oil-. The above is a common structure in the existing bailing pumping unit, and is not described herein again.
In the prior art, the wear of the steel wire rope 4 mainly occurs at the winding drum 3, and the specific wear reasons are two: on one hand, in the process that the steel wire rope 4 is wound on the winding drum 3, friction exists between the steel wire rope 4 which is wound on the winding drum 3 and the steel wire rope 4 which is wound on the winding drum 3, and the steel wire rope 4 is abraded; on the other hand, in order to wind the wire rope 4 regularly and orderly around the drum 3, some drums 3 are provided with a spiral groove 16 for accommodating the wire rope 4, but since the axis of the wire rope 4 of the drum 3 is vertical, the wire rope 4 inevitably rubs against the side wall of the spiral groove 16 when being wound around the drum 3, thereby causing abrasion of the wire rope 4.
in the invention, as shown in fig. 3 and 4, the outer wall of the winding drum 3 is provided with the spiral groove 16 for accommodating the steel wire rope 4, the winding drum 3 is arranged in an inclined manner, and the relationship between the acute angle α between the axis of the winding drum 3 and the steel wire rope 4 and the helix angle β of the spiral groove 16 is that α is 90- β, the friction on the side wall of the spiral groove 16 in the winding process of the steel wire rope 4 is greatly reduced by arranging the winding drum 3 in an inclined manner, so that the abrasion of the steel wire rope 4 is further reduced, and the service life of the steel wire rope 4 is prolonged.
The structure of the winding drum 3 comprises a drum body 12, a driving shaft 11, a thread supporting shaft 13 and a shaft bracket 10, wherein one end of the drum body 12 is connected with the driving shaft 11 through a spline, the other end of the drum body 12 is connected with the thread supporting shaft 13 through a transmission thread, the drum body 12 is mounted on the shaft bracket 10 through the driving shaft 11 and the thread supporting shaft 13, and the driving shaft 11 is driven by the motor to rotate, so that the winding drum 3 is driven. In order to align the steel wire rope 4 with the spiral groove 16 all the time, the invention is provided with a corresponding barrel 12 supporting structure to enable the winding drum 3 to move axially while rotating, and by adjusting the proportional relationship between the pitch of the thread on the thread supporting shaft 13 and the pitch of the spiral groove 16 (for example, when the structure shown in fig. 4 and fig. 6 is adopted, the proportional relationship is 1:1, and when the structure shown in fig. 5 is adopted, the proportional relationship can be calculated through a simple trigonometric function, which is not described any more here), the steel wire rope 4 cannot swing in the rotating process of the winding drum 3, so that the steel wire rope 4 is always aligned with the spiral groove 16, and the abrasion of the steel wire rope 4 at the winding drum 3 is reduced to the lowest. In addition, the structure reduces the abrasion of the steel wire rope 4 at the guide wheel 2.
In the installation, operation and maintenance process of the pumping unit, the underground operation is often required, and before the underground operation, the space above a wellhead must be left out, so that the obstruction of a pumping unit bracket and a guide wheel 2 to the construction is eliminated. At present, the guide wheel 2 and even the support are required to be detached before construction to ensure enough action space, the guide wheel 2 needs to be detached and installed by using a crane twice in a long distance, the construction cost is high, the construction efficiency is low, and potential safety hazards exist. In the invention, by designing the movable support structure, the way of the well mouth during the operation of the well field can be avoided by manpower under the condition of not starting a crane, so that the convenience of construction is effectively improved, the construction cost is reduced, and the potential safety hazard in the dispatching and transporting process is avoided. Specifically, the invention adopts two structural forms of supports to solve the problem of construction abdication.
A first stent structure:
as shown in fig. 1 and 8, the bracket structurally comprises a vertical rod 6 and an inclined rod 7, the lower end of the inclined rod 7 is hinged to the base 1, the guide wheel 2 is mounted at the upper end of the inclined rod 7 through a guide wheel mounting shaft 14, the lower end of the vertical rod 6 is hinged to the base 1, the upper end of the vertical rod 6 is provided with a notch 15 for accommodating the mounting shaft of the guide wheel 2, and the upper end of the inclined rod 7 is fixed above the vertical rod 6 through the matching of the guide wheel mounting shaft 14 and the notch 15; when the vertical rod 6 is located at the upper limit position, the vertical rod 6 is in a vertical state. Before underground operation construction, the connection between the steel wire rope 2 and the sucker rod is released, then the tail end of the steel wire rope 2 is connected to the guide wheel 2 or the upper end of the inclined rod 7, then the control motor is inching to enable the winding drum 3 to rotate intermittently at a low speed, the inclined rod 7 rotates clockwise under the traction of the steel wire rope 2, and in the rotating process, on one hand, the guide wheel mounting shaft 14 is separated from the notch 15, so that the connection between the vertical rod 6 and the inclined rod 7 is released, and therefore the vertical rod 6 can also rotate clockwise, and abdication above a well mouth is achieved; on the other hand, the inclined rod 7 and the guide wheel 2 installed on the inclined rod leave the position above the wellhead after the inclined rod 7 rotates, abdication above the wellhead is achieved, and the contour line shown by the two-dot chain line in fig. 1 is a virtual position after the inclined rod 7 rotates to the extreme position.
The support structure has the advantages of large abdicating range and simple structure, and can meet the construction conditions of most underground operations.
The second bracket structure:
as shown in fig. 2, the structure of the support includes a vertical rod 6, a first connecting rod 8, a second connecting rod 9 and a threaded telescopic rod 17, the lower end of the vertical rod 6 is hinged on the base 1, the guide wheel 2 is installed at the upper end of the vertical rod 6, the upper end of the first connecting rod 8 is hinged to the upper end of the vertical rod 6, the lower end of the first connecting rod 8 is hinged to the upper end of the second connecting rod 9, the lower end of the second connecting rod 9 is hinged on the base 1, one end of the threaded telescopic rod is hinged on a connecting point between the first connecting rod 8 and the second connecting rod 9, and the other end of the threaded telescopic rod is hinged on the base 1. Before underground operation construction, the included angle between the first connecting rod 8 and the second connecting rod 9 can be changed by adjusting the length of the threaded telescopic rod 17, so that the vertical rod 6 and the guide wheel 2 on the vertical rod can move within a certain range, and the purpose of abdicating is achieved.
The support structure has the advantages of more convenient operation, simple structure and smaller yielding space.
In addition, it should be noted that the threaded telescopic rod 17 is a structure commonly used in the mechanical field, and its function is only to realize telescopic support, so its structure has no special features compared with the prior art, and is not described herein again.
As a further technical solution, the cylinder 12 is cylindrical as a whole, and the spiral groove 16 is coiled along the cylindrical surface outside the cylinder 12.
As another embodiment of the cylinder 12, the section of the cylinder 12 where the spiral groove 16 is located is a cylindrical structure, and the included angle between the axis of the cylindrical section and the axis of the driving shaft 11 is equal to twice the helix angle β of the spiral groove 16. based on this design, during the axial movement of the cylinder 12, the inclination of the cylinder 12 and the inclination of the cylindrical section where the spiral groove 16 is located cancel each other out, so that the winding and unwinding speed of the steel wire rope 4 is more uniform and more stable, which is beneficial to improving the stability of the operation of the oil pumping system.
When the bailing pumping unit works, at the moment when the plunger of the oil well pump 5 moves upwards from the lower limit position, the power of the motor needs to overcome the gravity of the oil pumping rod and the gravity of well fluid and provide the acceleration at the moment when the plunger moves upwards, so that at the moment when the plunger of the oil well pump 5 moves upwards from the lower limit position, the load of the motor is extremely large, and the requirements on the power and the reliability of the motor are very high.
As a third embodiment of the barrel 12, in the present invention, the section of the barrel 12 where the spiral groove 16 is located may adopt the following structure: the section where the spiral groove 16 is located is a conical structure, the axis of the conical section is coincident with the axis of the barrel 12, and the connection point of the steel wire rope 4 and the barrel 12 is located at the small-diameter end of the conical section. Through adopting this kind of structure, at the initial stage of oil-well pump 5's plunger from lower extreme position upward movement, wire rope 4 is less at the winding diameter on reel 3, and at this moment, the motor only needs to provide less drive power can make wire rope 4 possess sufficient traction force, and simultaneously, along with the increase of winding diameter, motor load can smooth transition. Therefore, the invention can effectively reduce the requirement on the power of the motor, reduce the cost of the motor and simultaneously effectively improve the running stability of the oil pumping mechanism.
In a fourth embodiment of the cylinder 12, the section of the cylinder 12 where the spiral groove 16 is located is a drum-shaped structure with thick ends and thin middle, and the axis of the section is coincident with the axis of the cylinder 12. Similar to the third embodiment of the cylinder 12, this embodiment also has the function of adjusting the load variation of the motor.
As a further technical solution, the pitch of the spiral groove 16 is not less than 1.5 times the diameter of the steel wire rope 4. By arranging the spiral groove 16 with a large pitch, the steel wire rope 4 to be wound on the winding drum 3 can be effectively prevented from contacting the steel wire rope 4 already wound on the winding drum 3, so that the abrasion of the steel wire rope 4 is reduced.
Claims (8)
1. The utility model provides an intelligence beam-pumping unit, including base (1), support, guide pulley (2), reel (3), wire rope (4), oil-well pump (5), motor and the intelligent variable frequency controller who is used for the control motor, support fixed mounting is on base (1), the top at the support is installed in guide pulley (2), reel (3) and motor fixed mounting are on base (1), reel (3) are rotatory under the drive of motor, the one end winding of wire rope (4) is on reel (3), the other end from the upside of guide pulley (2) after by-pass with oil-well pump (5) are connected, its characterized in that:
a spiral groove (16) used for accommodating the steel wire rope (4) is formed in the outer wall of the winding drum (3), the winding drum (3) is arranged in an inclined mode, and the relationship between an acute angle α formed by the axis of the winding drum (3) and the steel wire rope (4) and the helix angle β of the spiral groove (16) is that α is 90- β;
the winding drum (3) structurally comprises a drum body (12), a driving shaft (11), a thread supporting shaft (13) and a shaft support (10), one end of the drum body (12) is connected with the driving shaft (11) through a spline, the other end of the drum body (12) is connected with the thread supporting shaft (13) through a transmission thread, the drum body (12) is installed on the shaft support (10) through the driving shaft (11) and the thread supporting shaft (13), and the driving shaft (11) rotates under the driving of a motor, so that the winding drum (3) is driven.
2. The intelligent pumping unit of claim 1, wherein: the support structurally comprises a vertical rod (6) and an inclined rod (7), the lower end of the inclined rod (7) is hinged to the base (1), the guide wheel (2) is mounted at the upper end of the inclined rod (7) through a guide wheel mounting shaft (14), the lower end of the vertical rod (6) is hinged to the base (1), a notch (15) used for accommodating the guide wheel (2) mounting shaft is formed in the upper end of the vertical rod (6), and the upper end of the inclined rod (7) is fixed above the vertical rod (6) through the matching of the guide wheel mounting shaft (14) and the notch (15);
when the vertical rod (6) is positioned at the upper limit position, the vertical rod (6) is in a vertical state.
3. The intelligent pumping unit of claim 1, wherein: the structure of support includes montant (6), first connecting rod (8), second connecting rod (9) and screw thread telescopic link (17), and the lower extreme of montant (6) articulates on base (1), the upper end at montant (6) is installed in guide pulley (2), the upper end of first connecting rod (8) links to each other with the upper end of montant (6) is articulated, and the lower extreme of first connecting rod (8) links to each other with the upper end of second connecting rod (9) is articulated, and the lower extreme of second connecting rod (9) articulates on base (1), the one end of screw thread telescopic link articulates on the tie point between first connecting rod (8) and second connecting rod (9), and the other end of screw thread telescopic link articulates on base (1).
4. The intelligent pumping unit of claim 1, wherein: the barrel (12) is integrally cylindrical, and the spiral groove (16) is coiled along the cylindrical surface of the outer side of the barrel (12).
5. the intelligent oil pumping unit according to claim 1, characterized in that the section of the spiral groove (16) on the cylinder (12) is a cylindrical structure, and the included angle between the axis of the cylindrical section and the axis of the driving shaft (11) is equal to twice the helix angle β of the spiral groove (16).
6. The intelligent pumping unit of claim 1, wherein: the section of the barrel (12) where the spiral groove (16) is located is of a conical structure, the axis of the conical section is overlapped with the axis of the barrel (12), and the connecting point of the steel wire rope (4) and the barrel (12) is located at the small-diameter end of the conical section.
7. The intelligent pumping unit of claim 1, wherein: the section of the barrel (12) where the spiral groove (16) is located is of a drum-shaped structure with two thick ends and a thin middle part, and the axis of the section is superposed with the axis of the barrel (12).
8. The intelligent pumping unit of claim 1, wherein: the pitch of the spiral groove (16) is not less than 1.5 times of the diameter of the steel wire rope (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196362.8A CN111173478B (en) | 2020-03-19 | 2020-03-19 | Intelligent oil pumping unit |
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|---|---|---|---|
| CN202010196362.8A CN111173478B (en) | 2020-03-19 | 2020-03-19 | Intelligent oil pumping unit |
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| CN111173478A true CN111173478A (en) | 2020-05-19 |
| CN111173478B CN111173478B (en) | 2020-09-08 |
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| CN116658128A (en) * | 2023-07-31 | 2023-08-29 | 大庆市华禹石油机械制造有限公司 | Multi-well coordinated oil pumping equipment |
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|---|---|---|---|---|
| CN115477219A (en) * | 2022-08-15 | 2022-12-16 | 河南省川达建筑机械有限公司 | Rope sheave assembly and no-top beam type hoistway construction elevator |
| CN116658128A (en) * | 2023-07-31 | 2023-08-29 | 大庆市华禹石油机械制造有限公司 | Multi-well coordinated oil pumping equipment |
| CN116658128B (en) * | 2023-07-31 | 2023-10-13 | 大庆市华禹石油机械制造有限公司 | Multi-well coordinated oil pumping equipment |
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| CN111173478B (en) | 2020-09-08 |
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