CN102352737A - Twin-well two-way hydraulic linkage oil pumping method and adopted oil pumping device thereof - Google Patents
Twin-well two-way hydraulic linkage oil pumping method and adopted oil pumping device thereof Download PDFInfo
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- CN102352737A CN102352737A CN2011102942333A CN201110294233A CN102352737A CN 102352737 A CN102352737 A CN 102352737A CN 2011102942333 A CN2011102942333 A CN 2011102942333A CN 201110294233 A CN201110294233 A CN 201110294233A CN 102352737 A CN102352737 A CN 102352737A
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Abstract
The invention discloses a twin-well two-way hydraulic linkage oil pumping method and also relates to an oil pumping device adopted by the method. In the oil pumping device, two dual-horse head hydraulic oil pumping units of two wellheads are connected together to form a unit; the two oil pumping units are connected through a hydraulic device, share one hydraulic pump and are in a relation of counter motion. The entirety of the two dual-horse head hydraulic oil pumping units comprises a support assembly, a walking beam assembly, an oil pumping unit base and a hydraulic cylinder system. By adopting the twin-well two-way hydraulic linkage oil pumping method and the adopted oil pumping device thereof, the problems that a traditional oil pumping device and method have high energy consumption, the mechanical operation is not stable, whereas the oil pumping unit has a complicated equipment structure, and the modifying cost is high are solved.
Description
Technical field
The invention belongs to technical field of petroleum extraction, relate to a kind of oil pumping method, be specifically related to a kind of twin-well bidirectional hydraulic interlock oil pumping method, the invention still further relates to the oil rig that said method adopts.
Background technology
Oil pumper is a kind of important plant equipment of recover petroleum, is commonly called as " machine of kowtowing ", is to make oil go out well through the method for pressurizeing.Oil pumper in fact with we at ordinary times the well beaten of family oneself principle of drawing water be the same; Be that swabbing action through a pitch brace (sucker rod) extracts up oil; Through the underground pipeline that buries oil transportation is walked then, but difference drives through motor with regard to the action that is pitch brace in the oil pumper and accomplishes.
At present domestic oil pumper kind form is a lot, but great majority still are traditional beam pumping unit, and this oil pumper also is referred to as girder-like oil pump or beam type crank balanced pumping unit.This type oil pumper mainly is made up of four major parts such as walking beam-connecting rod-crank mechanism, reduction box, power-equipment and auxiliary equipment.In work; Motor will rotatablely move and be transformed into the upper and lower motion of horse head through gearbox, crank-link mechanism; Horse head is done upper and lower motion through the plunger that polished rod, sucker rod drive downhole pump, thereby constantly the crude oil in the well is extracted out pit shaft.That beam pumping unit has is stable and reliable for performance, operating maintenance advantage easily, but because of it has the weakness that structure is huge, energy consumption is high, makes people all seek a kind of more advanced oil production equipment always, and the hydraulic driven oil pumper is exactly one of them.
In recent years, most of hydraulic drive oil pumping machines obtained equipment transformation on the basis of traditional beam pumping unit.This wherein has plenty of requirement all destroys old equipment, and update all is new system, has caused bigger waste, and the repacking cost is higher; And other owing to the reason of technology such as: need the operation of long stroke, low jig frequency, make old equipment can not be applicable to new technology, this also can't adopt traditional beam pumping unit in-situ reformation.A kind of reciprocating petroleum beam-pumping unit with hydraulic transmission is arranged; Because the frame mechanical part is too much; The frame for movement more complicated; Break down easily in the use; And in the hydraulic drive process owing to increased balancing weight; Make the advantage of hydraulic transmission not reach utilization preferably, the most important thing is and to carry out in-situ reformation to original beam pumping unit; Also has a kind of double mule head secondary regulation hydraulic pumping unit; Its hydraulic cylinder is an executive component; Have the effect of accumulation of energy simultaneously concurrently; In the accumulation of energy process, be easy to generate the leakage of liquid and energy, and because hydraulic cylinder is buried under the ground, stroke is very big again; Need buried depth darker; This is all very inconvenient for installation and maintenance machinery, and requiring for hydraulic cylinder is high pressure, so the expense of material is also than higher.This shows that some hydraulic drive oil pumping machines that occurred still exist the shortcoming and defect that device structure complicacy, improvement expenses are high, mechanical movement is unstable, energy consumption is bigger.
Summary of the invention
The purpose of this invention is to provide a kind of twin-well bidirectional hydraulic interlock oil pumping method, solved that existing oil pumping method energy consumption is high, mechanical movement is unstable, the oil pumper device structure of employing is complicated, the high problem of improvement expenses.
Another object of the present invention provides the oil rig that said method adopts.
The technical scheme that the present invention adopts is; Two oil pumpers of two well heads are coupled together form a unit; Two oil pumpers connect through a hydraulic means; A shared hydraulic pump; Two oil pumpers are counter motion, and when promptly the first well was in the upstroke motion, the second well was in the down stroke motion; The potential energy that second down-hole stroke movement is produced is converted into the hydraulic pressure ability with the electric energy of hydraulic pump, and is up through the hydraulic system pulling first OIH bar of first well; Otherwise the potential energy that first down-hole stroke movement is produced is converted into the hydraulic pressure ability with the electric energy of hydraulic pump, and is up through the oil in the hydraulic system promotion second well of second well; This method is through adopting twin-well bidirectional hydraulic gang pumping unit to accomplish.
Another technical scheme that the present invention adopts is the structure of twin-well bidirectional hydraulic gang pumping unit, comprises two two horse head hydraulic oil pumping units that are connected through hydraulic means.Described pair of horse head hydraulic oil pumping unit; Comprise oil pumping unit base; Oil pumping unit base is provided with bracket assembly; The top of bracket assembly has been horizontally disposed with the walking beam assembly by axis of centres bearing; The two ends of walking beam assembly are respectively arranged with horse head a and horse head b; Be connected with the outstanding rope of the steel wire a that stretches out by polished rod eye a, packing box on the horse head a; The lower end of the outstanding rope of steel wire a is connected with flow tee and wellhead assembly; Described horse head b is connected with polished rod eye b by the outstanding rope of steel wire b; The other end of polished rod eye b is connected with piston rod; The lower end of piston rod puts in the hydraulic cylinder and is connected with piston; Top one side of hydraulic cylinder is provided with oil inlet and outlet; The middle part of hydraulic cylinder is fixed on the oil pumping unit base by flange; The bottom of hydraulic cylinder is provided with the hydraulic cylinder cylinder cap; Hydraulic cylinder cylinder cap one side is provided with down oil inlet and outlet; One side of described oil pumping unit base is provided with power assembly; Power assembly is connected with hydraulic means; Power assembly is provided with clamper and brake gear; Described hydraulic means comprises filter, volume adjustable hydraulic pump and the check valve that connects successively; Three loops of oil-out output of check valve; Article one, the loop is connected with the hydraulic cylinder epicoele of hydraulic control one-way valve a and first well head in turn; The second loop is connected with the hydraulic cylinder epicoele of hydraulic control one-way valve c and second well head in turn; Article three, the loop is connected with three position four-way directional control valve and hydraulic control one-way valve b in turn; The oil-out of hydraulic control one-way valve b is connected with the hydraulic cylinder cavity of resorption of first well head and the hydraulic cylinder cavity of resorption of second well head respectively; The both sides of three position four-way directional control valve are respectively arranged with electromagnet a and electromagnet b; The oil-out of check valve also is connected with hydraulic control one-way valve c by switch valve with two-position and five-pass; The both sides of switch valve with two-position and five-pass are respectively arranged with electromagnet c and electromagnet d, are respectively arranged with overflow valve a and overflow valve b on second loop and the 3rd loop.
The invention has the beneficial effects as follows, twin-well bidirectional hydraulic interlock oil pumper reasonable in design, improvement expenses is low, and the mechanical movement situation is stable, and energy consumption is lower, and its society and economic benefit are good.
Description of drawings
Fig. 1 is the two horse head hydraulic oil pumping unit structural representations in the twin-well bidirectional hydraulic interlock oil pumper of the present invention;
Fig. 2 is a twin-well bidirectional hydraulic interlock oil pumper structural representation of the present invention;
Among the figure, 1. oil pumping unit base, 2. bracket assembly, 3. axis of centres bearing; 4. walking beam assembly, 5. horse head a, 6. horse head b, 7. polished rod eye a; 8. packing box, the 9. outstanding rope of steel wire a, 10. flow tee, 11. wellhead assemblies; 12. the outstanding rope of steel wire b, 13. polished rod eye b, 14. piston rods; 15. piston, 16. hydraulic cylinders, oil inlet and outlet on 17.; 18. flange, 19. hydraulic cylinder cylinder caps, 20. clampers; 21. brake gear, 22. times oil inlet and outlets, 23. overflow valve a; 24. overflow valve b, 25. three position four-way directional control valves, 26. strainers; 27. volume adjustable hydraulic pump, 28. one way valves, 29. switch valve with two-position and five-pass; 30. electromagnet a, 31. electromagnet b, 32. electromagnet c; 33. electromagnet d, 34. hydraulic control one-way valve a, 35. hydraulic control one-way valve b; 36. hydraulic control one-way valve c, 37. displacement transducer a, 38. displacement transducer b.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is elaborated.
Twin-well bidirectional hydraulic interlock oil pumping method of the present invention; Be that two oil pumpers will installing on two well heads couple together and form a unit; By original oil pumper is carried out suitable repacking; Withdraw gearbox; Increased hydraulic system; Overcome the problem of traditional oil pumper fluctuation of service largely; (a bite well is the first well to the power resources of whole system in Liang Koujing; Another mouthful is for the second well) the hydraulic pressure energy of the potential energy that deadweight is produced and shared hydraulic pump; Two two horse head hydraulic oil pumping units in this equipment connect by a hydraulic means; A shared hydraulic pump; This hydraulic pump can be installed according to the actual conditions at scene, can be installed in inner or other the comparatively suitable places of oil pumping unit base.Two two horse head hydraulic oil pumping units are counter motion; When even the first well is in the upstroke motion; The second well then is in the down stroke motion, and the potential energy that second down-hole stroke movement is produced is converted into the hydraulic pressure ability with the electric energy of hydraulic pump, and is up through the hydraulic system pulling first OIH bar of first well.Otherwise; The potential energy that first down-hole stroke movement is produced is converted into the hydraulic pressure ability with the electric energy of hydraulic pump; Oil through in the hydraulic system promotion second well of second well is up; Owing to almost equate with the weight of second OIH bar and liquid in the first well; So wherein the potential energy of a bite down-hole row generation just is enough to compensate the aboveground capable institute of another mouthful work; So just can make full use of the idle work that two mouthfuls of wells are produced in descending process; Improve the utilization rate of electric power, well played energy-conservation effect.Hydraulic pump only need provide two mouthfuls of well friction energy needed, so just can reduce the energy consumption in the whole oil pumping process greatly.
The structure of oil rig of the present invention as shown in Figure 2, comprises two two horse head hydraulic oil pumping units that are connected through hydraulic means.The structure of two horse head hydraulic oil pumping units; As shown in Figure 1; Comprise oil pumping unit base 1; Oil pumping unit base 1 is provided with bracket assembly 2; The top of bracket assembly 2 has been horizontally disposed with walking beam assembly 4 by axis of centres bearing 3; The two ends of walking beam assembly 4 are respectively arranged with horse head a5 and horse head b6; Be connected with the outstanding rope of the steel wire a9 that stretches out by polished rod eye a7, packing box 8 on the horse head a5; The lower end of the outstanding rope of steel wire a9 is connected with flow tee 10 and wellhead assembly 11; Described horse head b6 is connected with polished rod eye b13 by the outstanding rope of steel wire b12; The other end of polished rod eye b12 is connected with piston rod 14; The lower end of piston rod 14 puts in the hydraulic cylinder 16 and is connected with piston 15; Top one side of hydraulic cylinder 16 is provided with oil inlet and outlet 17; The middle part of hydraulic cylinder 16 is fixed on the oil pumping unit base 1 by flange 18; The bottom of hydraulic cylinder 16 is provided with hydraulic cylinder cylinder cap 19; Hydraulic cylinder cylinder cap 19 1 sides are provided with down oil inlet and outlet 22; One side of described oil pumping unit base 1 is provided with power assembly; Power assembly is connected with hydraulic means, and power assembly is provided with clamper 20 and brake gear 21.
As shown in Figure 2; Comprise the filter 26, volume adjustable hydraulic pump 27 and the check valve 28 that connect successively; Three loops of oil-out output of check valve 28; Article one, the loop is connected with hydraulic cylinder 16 epicoeles of hydraulic control one-way valve a34 and first well head in turn; The second loop is connected with the hydraulic cylinder epicoele of hydraulic control one-way valve c36 and second well head in turn; Article three, the loop is connected with three position four-way directional control valve 25 and hydraulic control one-way valve b35 in turn; The oil-out of hydraulic control one-way valve b35 is connected with hydraulic cylinder 16 cavity of resorptions of first well head and the hydraulic cylinder cavity of resorption of second well head respectively; The both sides of three position four-way directional control valve 25 are respectively arranged with electromagnet a30 and electromagnet b31; The oil-out of check valve 28 also is connected with hydraulic control one-way valve c36 by switch valve with two-position and five-pass 29; The both sides of switch valve with two-position and five-pass 29 are respectively arranged with electromagnet c32 and electromagnet d33, are respectively arranged with overflow valve a23 and overflow valve b24 on second loop and the 3rd loop.
The course of work of the present invention is: when breaking off the clamper 20 of second well head clamper and first well head; Start volume adjustable hydraulic pump 27 simultaneously; Two horse head hydraulic oil pumping units at first well head place start; The horse head a5 that is in top dead-centre is owing to the effect that is subjected to gravity begins descending; Horse head b6 just drives piston stroking upward; Pressure in hydraulic cylinder 16 epicoeles begins to rise; Pressure in the cavity of resorption begins to descend; The hydraulic oil effect of being under pressure in hydraulic cylinder 16 epicoeles; Converge through the hydraulic control one-way valve a34 of hydraulic means inside and the pressure oil of volume adjustable hydraulic pump 27 outputs again by last oil inlet and outlet 17; The inner electromagnet c32 energising of hydraulic means simultaneously; The loop is inserted in position, switch valve with two-position and five-pass 29 left side; This moment, hydraulic control one-way valve b35 opened; Pressure oil is through the epicoele of two horse head hydraulic oil pumping unit hydraulic cylinders of check valve 28, switch valve with two-position and five-pass 29, hydraulic control one-way valve b35 entering second Jing Chu, and the piston that horse head of two horse head hydraulic oil pumping units of second Jing Chu promotes in the hydraulic cylinder moves downward.Because the pressure of hydraulic cylinder cavity of resorption is greater than the pressure of two horse head hydraulic oil pumping unit hydraulic cylinder 16 cavity of resorptions in first well place here; Pressure oil is flowed to the hydraulic cylinder 16 of first Jing Chu by the hydraulic cylinder of second Jing Chu; When the piston 15 of hydraulic cylinder 16 rose to range, the piston in the hydraulic cylinder of second Jing Chu also dropped to range.
Above-mentioned process has just been accomplished the work of half period; Following half period is that two horse head hydraulic oil pumping units that the second well head is installed start; Being in the effect that a horse head of top dead-centre receives gravity begins descending; It is up that another horse head just drives piston rod; The piston of pulling hydraulic cylinder moves upward; Hydraulic oil is through the hydraulic cylinder epicoele; The oil of hydraulic control one-way valve b35 that hydraulic means is inner and volume adjustable hydraulic pump 27 outputs converges; The inner electromagnet d33 energising of hydraulic means this moment; The loop is inserted in switch valve with two-position and five-pass 29 right positions; Hydraulic oil is through switch valve with two-position and five-pass 29; Hydraulic control one-way valve a34 gets into the epicoele of hydraulic cylinder 16; The piston 15 that promotes in the hydraulic cylinder 16 moves downward; When the hydraulic cylinder piston of second Jing Chu rises to range; Piston 15 in the hydraulic cylinder 16 also drops to range, accomplishes the work of half period down.At this moment each equipment is got back to initial state, prepares to get into the operation of following one-period, so ceaselessly comes and goes operation, has realized that the beam hanger of two mouthfuls of wells upwards promotes.Because deadweight institute work was converted into the potential energy that the rising of another mouthful well beam hanger needs in time through hydraulic oil when a bite down-hole fell; So just can omit the accumulator of intermediate link; Avoided the loss of energy, this device has better energy-saving effect than the hydraulic means that has accumulator.
Owing to exist factors such as load is poor, leakage, frictional resistance to make when the hydraulic cylinder of hydraulic cylinder 16 and second well head of first well head can not synchronous operation; Can realize their synchronous operation through compensating device: if the piston of the hydraulic cylinder of second well head arrives end point of travel earlier; The displacement transducer a37 at second well head place will transmit signal; Electromagnet a30 connects; The loop is inserted in position, three position four-way directional control valve 25 left side; Pressure oil carries out repairing through three position four-way directional control valve 25 and the hydraulic cylinder cavity of resorption that hydraulic control one-way valve c36 gets into second well head place, makes piston continue up arrival end point of travel.Otherwise; If piston 15 arrives end point of travel earlier; Then displacement transducer b38 will transmit signal; Electromagnet b31 connects; The loop is inserted in three position four-way directional control valve 25 right positions; Hydraulic control one-way valve c36 opens, and the hydraulic cylinder cavity of resorption at second well head place and loop are connected, and makes the piston in the hydraulic cylinder at second well head place can continue descending arrival end point of travel.Three position four-way directional control valve 25 can be controlled the switch of switch valve with two-position and five-pass 29 and three position four-way directional control valve 25 continuously according to the feedback signal of displacement transducer a37, displacement transducer b38, thereby the hydraulic cylinder that guarantees first and second liang of well heads obtains two-way being synchronized with the movement.
Claims (4)
1 Shuangjing bidirectional pumping hydraulic linkage, characterized in that the concrete implementation of the following steps, the two wellhead connect two pumping a unit, the two pumping units connected via a hydraulic device, sharing a Pump, pumping was the reverse movement, i.e. a stroke movement in the upper wells, wells in the lower stroke motion ethyl acetate downhole potential energy generated by the movement stroke of the hydraulic pump with the electrical energy into hydraulic energy, by means of a A well borehole hydraulic system oil pulling rod row; contrary, a downhole potential energy generated by the movement stroke of the hydraulic pump with the electrical energy into hydraulic energy, the hydraulic system by means of push ethyl acetate wells for oil wells upward; said method uses shuangjing bidirectional hydraulic linkage pumping apparatus structure: including hydraulic device connected via two double horse head hydraulic pumping unit, said hydraulic double horse head pumping unit, including pumping base (a ), pumping the base (1) is provided with a bracket assembly (2), bracket assembly (2) through the top of the central bearing (3) is provided with a horizontal beam assembly tour (4), Tour beam assembly ( 4) are respectively provided at both ends of the donkey head a (5) and the head of an ass b (6), horse head a (5) is connected by a hanging rope a (7), packing boxes (8) protruding wire hanging rope a (9), wire hanging rope a (9) is connected to the lower end of the oil tee (10) and wellhead equipment (11), said horsehead b (6) through the wire hanging rope b (12) and hanging rope b (13) is connected, hanging rope b (13) is connected to the other end of the piston rod (14), the piston rod (14) extends into the lower end of the hydraulic cylinder (16) of the piston (15) is connected, Hydraulic cylinder (16) is provided on the top side of the oil inlet and outlet (17), a hydraulic cylinder (16) by the middle flange (18) fixed to the pumping unit base (1), the hydraulic cylinder (16) at the bottom of is provided with a hydraulic cylinder head (19), the cylinder head (19) provided with a lower side of the oil inlet and outlet (22), pumping said base (1) is provided on one side of the powertrain, powertrain a hydraulic device connected to the powertrain is provided with a gripper (20) and brake means (21), said hydraulic means comprises a filter connected in sequence (26), the variable hydraulic pump (27) and the one-way valve (28), one-way valve (28) out of the oil port output three loops, the first loop in turn connected to a check valve a (34) and A wellhead hydraulic cylinder (16) the upper chamber, the second loop in turn connected to a check valve c (36) and B wellhead hydraulic cylinder chamber in turn is connected to the third loop three-way valve (25) and check valve b (35), hydraulic control the check valve b (35) of the oil outlet, respectively, the wellhead and a hydraulic cylinder (16) and the lower chamber of the hydraulic cylinder B wellhead is connected to the lower chamber, three way valve (25) is provided on both sides of solenoid a (30) and solenoid b (31), one-way valve (28) of the oil port also adopted two five-way valve (29) and check valve c (36) is connected to two 5/2-way valve (29) arranged on both sides of the electromagnet c (32) and solenoid d (33), the second and third loop circuit is provided with a pressure relief valve, respectively, a (23) and relief b (24).
2. twin-well bidirectional hydraulic gang pumping unit is characterized in that, comprises two two horse head hydraulic oil pumping units that are connected through hydraulic means.
3. twin-well bidirectional hydraulic gang pumping unit according to claim 2; It is characterized in that; Described pair of horse head hydraulic oil pumping unit; Comprise oil pumping unit base (1); Oil pumping unit base (1) is provided with bracket assembly (2); The top of bracket assembly (2) has been horizontally disposed with walking beam assembly (4) by axis of centres bearing (3); The two ends of walking beam assembly (4) are respectively arranged with horse head a(5) and horse head b(6); Horse head a(5) be connected with by polished rod eye a(7 on), the outstanding rope of the steel wire that stretches out of packing box (8) a(9); The outstanding rope of steel wire a(9) lower end is connected with flow tee (10) and wellhead assembly (11); Described horse head b(6) by the outstanding rope of steel wire b(12) with polished rod eye b(13) be connected; Polished rod eye b(13) the other end is connected with piston rod (14); The lower end of piston rod (14) puts in the hydraulic cylinder (16) and is connected with piston (15); Top one side of hydraulic cylinder (16) is provided with oil inlet and outlet (17); The middle part of hydraulic cylinder (16) is fixed on the oil pumping unit base (1) by flange (18); The bottom of hydraulic cylinder (16) is provided with hydraulic cylinder cylinder cap (19); Hydraulic cylinder cylinder cap (19) one sides are provided with down oil inlet and outlet (22); One side of described oil pumping unit base (1) is provided with power assembly; Power assembly is connected with hydraulic means, and power assembly is provided with clamper (20) and brake gear (21).
4. twin-well bidirectional hydraulic gang pumping unit according to claim 2; It is characterized in that; Described hydraulic means; Comprise the filter (26), volume adjustable hydraulic pump (27) and the check valve (28) that connect successively; Three loops of oil-out output of check valve (28); Article one, the loop is connected with hydraulic control one-way valve a(34 in turn) and hydraulic cylinder (16) epicoele of first well head; The second loop is connected with hydraulic control one-way valve c(36 in turn) and the hydraulic cylinder epicoele of second well head; Article three, the loop is connected with three position four-way directional control valve (25) and hydraulic control one-way valve b(35 in turn); Hydraulic control one-way valve b(35) oil-out is connected with hydraulic cylinder (16) cavity of resorption of first well head and the hydraulic cylinder cavity of resorption of second well head respectively; The both sides of three position four-way directional control valve (25) are respectively arranged with electromagnet a(30) and electromagnet b(31); The oil-out of check valve (28) is also by switch valve with two-position and five-pass (29) and hydraulic control one-way valve c(36) be connected; The both sides of switch valve with two-position and five-pass (29) are respectively arranged with electromagnet c(32) and electromagnet d(33), be respectively arranged with overflow valve a(23 on second loop and the 3rd loop) and overflow valve b(24).
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| CN2011102942333A CN102352737A (en) | 2011-09-28 | 2011-09-28 | Twin-well two-way hydraulic linkage oil pumping method and adopted oil pumping device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102942333A CN102352737A (en) | 2011-09-28 | 2011-09-28 | Twin-well two-way hydraulic linkage oil pumping method and adopted oil pumping device thereof |
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| CN102352737A true CN102352737A (en) | 2012-02-15 |
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| CN2011102942333A Pending CN102352737A (en) | 2011-09-28 | 2011-09-28 | Twin-well two-way hydraulic linkage oil pumping method and adopted oil pumping device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109707346A (en) * | 2018-11-21 | 2019-05-03 | 沈阳人和机电工程设备有限公司 | A kind of moveable pumping unit of counterweight center of gravity |
| CN112576226A (en) * | 2019-09-29 | 2021-03-30 | 王力 | Hydraulic double-horsehead oil pumping unit |
| CN115434673A (en) * | 2022-09-27 | 2022-12-06 | 宝鸡汇特石油设备有限公司 | Control system of double-horsehead oil pumping unit |
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| CN112576226A (en) * | 2019-09-29 | 2021-03-30 | 王力 | Hydraulic double-horsehead oil pumping unit |
| CN115434673A (en) * | 2022-09-27 | 2022-12-06 | 宝鸡汇特石油设备有限公司 | Control system of double-horsehead oil pumping unit |
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