CN107420072A - A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology - Google Patents
A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology Download PDFInfo
- Publication number
- CN107420072A CN107420072A CN201710858779.4A CN201710858779A CN107420072A CN 107420072 A CN107420072 A CN 107420072A CN 201710858779 A CN201710858779 A CN 201710858779A CN 107420072 A CN107420072 A CN 107420072A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- sucker rod
- pump
- oil
- pressure
- 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.)
- Pending
Links
- 238000005086 pumping Methods 0.000 title claims abstract description 31
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 23
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 239000002828 fuel tank Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 206010020852 Hypertonia Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000013555 soy sauce Nutrition 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of double motor based on Hydrostatic drive technology to drive hydraulic pumping unit, the oil pumper is made up of mechanical part and hydraulic-driven part, its mechanical structure employs symmetrical balance arrangement, the sucker rod or single sucker rod of i.e. two oil pumpers are arranged symmetrically in the both sides of driving drum with counterweight after steel wire rope is connected, and the steel wire rope of both sides in driving drum around to opposite, therefore when roller side sucker rod rise when, then the sucker rod of opposite side or with re-synchronize decline；Hydraulic-driven part employs hydraulic pressure Hydrostatic drive Secondary Regulation Technology, and use two secondary component hydraulic motor/pump combination drive rollers, only power is provided in the at the uniform velocity low power run stage by a secondary component, improve the operational efficiency of system, and system installation power is small, it is notable without throttling and spill losses, energy-saving effect.
Description
Technical field
The present invention is a kind of using hydraulic pressure hydrostatic drive technology and using the hydraulic pumping unit of double motor driving, and it is applied to
Oil exploitation field of engineering technology.
Background technology
At present, it is low to there is mechanical structure bulky complex, manufacturing cost height and operating efficiency in traditional beam pumping unit（State
Interior such efficiency of the pumping unit is generally 12-23%, and foreign countries are also only 30% or so）The shortcomings of, especially later stage in oilfield exploitation
And in thickened oil recovery, it is difficult to adapt to the needs of production；And hydraulic pumping unit due to efficiency high, easily recover energy, mass body
The focus that the advantages that compact, long stroke of product and adjustable number of strokes is just turning into scientific research personnel and production firm researches and develops, with energy
The aggravation of source crisis and the favor that is increasingly subject to of energy-conserving product are rapidly developed it.In current research and Related product
In, the method for hydraulic pumping unit energy-conservation is mainly to first pass through gravitional force when hydraulic accumulator recovery sucker rod falls, and
Realized when sucker rod rises by the accumulator auxiliary oil pumping that releases energy, be that energy is outstanding by multiple conversions the shortcomings that the method
It is to consider during component efficiencies the effect of energy recycling to be declined, and General System both increases corresponding energy
Conversion element, so as to add the structural complexity of system and manufacturing cost.Another adopted method is to set counterweight
With the weight balancing of sucker rod, so as to reach the purpose that reduction system installation power realizes energy-conservation, but this method causes oil pumper
Power needed for after overcoming inertia force completion to accelerate into constant velocity stage significantly reduces, and now passes through and adjusts reduction hydraulic-driven
The swash plate angle of element makes its power output also accordingly reduce so that hydraulic driving element is under the operating mode far below rated power
Run and cause less efficient.To overcome disadvantages mentioned above, the present invention proposes a kind of double motor based on Hydrostatic drive technology and driven
Hydrodynamic pressure oil pumper.
The content of the invention
In order to solve the problems, such as that existing oil pumper is present, the present invention is improved in terms of structure and system drive two, first
The Design of Mechanical Structure of balance is first employed, i.e., is taken out using a set of two hydraulic pressure mutually balanced of hydraulic pressure hydrostatic transmission system drives
Oil machine alternation, or using separate unit hydraulic pumping unit counterweight can also be added to balance in the oil-producing region for being not suitable for installing double oil wells
Structure design, secondly for overcome balanced hydraulic oil extractor enter constant velocity stage fallback problem, driving element use
Two hydraulic motor/pumps so that system drives jointly in boost phase by two hydraulic motor/pumps for being operated in motor operating conditions
Oil pumping machine oil pumping, output torque is adjusted to adapt to loading demand in real time by adjusting the swash plate angle of hydraulic motor/pump, and
Into under constant velocity stage's low power load demand operating mode, only power source is provided and in high efficiency by a wherein hydraulic motor/pump
Lower operation, so as to realize the purpose of efficient energy-saving.
Technical scheme is used by patent of the present invention solves its technical problem：In mechanical structure, hydrostatic regulation is double
The sucker rod 1 and sucker rod 2 of motor driving hydraulic pumping unit are either replaced by counterweight, by two after by steel wire rope pull-up
After crown sheave, steel wire rope is according to mutually rewinding to being wrapped in driving drum, and roller both sides reach balance, so as in sucker rod 1
Rise oil pumping when, sucker rod 2 or with re-synchronize decline, sucker rod decline potential energy be converted into the potential energy of counterweight and under
Being utilized during secondary oil pumping, black soy sauce oil well can continuously pump when configuring, and when one of sucker rod is arranged to counterweight, returned in sucker rod
Do not pumped when returning；In system drive, the hydraulic pumping unit employs hydraulic pressure hydrostatic drive technology, i.e. motor driven bidirectional hydraulic
Pump exports hydraulic oil to constant pressure network, secondary component hydraulic pressure horse of the drive installation in roller both sides again of the hydraulic oil in constant pressure network
Up to/pump rotation, so as to drive roller rotating, the steel wire rope being wrapped on roller drives sucker rod raising and lowering, Quadratic Finite Element
Part motor/pump can change discharge capacity to adapt to the change of load by changing swashplate angle, and system is due to without throttling and overflow damage
Lose, so as to which overall energy-saving efficiency is obvious.
The advantage and energy-saving effect of patent of the present invention：
Compared with beam pumping unit, patent structure of the present invention is compact, in light weight, can effectively recover energy；With installation at present
Hydraulic pumping unit compare, the present invention have the potentiality that twin-well is continuously pumped, integral installation power is smaller, longer into run time
Constant velocity stage when, system consumption power is relatively low, by adjust wherein one secondary component motor/pump swashplate angle be zero,
System only provides power by an other motor/pump, can realize high-efficiency operation, braking energy can also be reclaimed in the decelerating phase,
Therefore system whole energy effect is preferable.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is present system structural representation.
Fig. 2 is the double motor driving principle figure of the invention based on hydrostatic regulation technology；
The crown sheave 7. of 1. hydraulic station, 2. driving drum, 3. frame, 4. sucker rod, 1 5. steel wire rope 6. is taken out in Fig. 1
The fluid pressure line of 2 8. hydraulic motor/pump of beam hanger 9..
Embodiment
【Embodiment 1】
As shown in figure 1, double motor driving hydraulic pumping unit mechanical structure unit that should be based on Hydrostatic drive technology is mainly by hydraulic pressure
Stand 1, driving drum 2, frame 3, sucker rod 4, the composition such as steel wire rope 5, crown sheave 6, hydraulic motor/pump 8, fluid pressure line 9, two
Individual oil pumper is arranged in the both sides of frame 3, and the steel wire rope 5 after being connected with two sucker rods 4 is wrapped in driving after crown sheave 6
Roller both sides, and wound in the opposite direction on roller, so that when the sucker rod of roller side rises oil pumping, opposite side
Sucker rod synchronously decline, form the oil pumping of twin-well alternately operating and reach continuity oil pumping.In addition, for being not suitable for nearer
The sucker rod of driving drum side, can be changed to counterweight, the course of work does not occur by the oil-producing region of distance two oil wells of installation
Change, simply continuously pumped from twin-well and be changed into individual well oil pumping.Described hydraulic station includes motor, variable pump, direction valve, overflow
Valve, check valve, accumulator and fuel tank, constant pressure network is formed between two-way variable displacement pump and two secondary components, hydraulic pump output
Hydraulic oil flows into secondary component, and is rotated by decelerator deceleration rear driving drum, the effect of the overflow valve between constant pressure network
It is for when hypertonia, hydraulic oil enters fuel tank by overflow valve, and the check valve between constant pressure network is used to separate hydraulic oil
With fuel tank, while the oil in fuel tank can pass through check valve repairing into low pressure oil return line.
【Embodiment 2】
As shown in Fig. 2 drive hydraulic pumping unit drive system schematic diagram for hydraulic pressure Hydrostatic drive double motor.The hydraulic pressure Hydrostatic drive
System is mainly by motor, volume adjustable hydraulic pump, two secondary component hydraulic motor/pumps, decelerator, direction valve, check valve, overflows
Valve, accumulator, fluid pressure line and fuel tank composition.
When the sucker rod of oil pumper is in the Accelerating running stage, this process is because loading demand is larger, now Quadratic Finite Element
Part hydraulic motor/pump is operated in motor operating conditions, and hydraulic system two secondary components of driving, which are operated together, meets that sucker rod accelerates to want
Ask, and according to the change of load, secondary component adjusts swash plate angle so as to change output torque size in real time, and then adjusts roller
Rotating speed.When entering constant velocity stage after the completion of acceleration, inertia force during due to overcoming acceleration, the power of sucker rod demand is significantly
Reduce, to improve the operating efficiency of driving element, now the swash plate of wherein one secondary component is by being adjusted back to zero-bit and nothing
Power output, power only is provided by an other secondary component to drive sucker rod to rise oil pumping；When sucker rod enters deceleration rank
Duan Shi, two secondary components work by pump condition, to reclaim the formulation kinetic energy of sucker rod and adjust the oblique of pump according to deceleration demand
Disk angle reaches deceleration target, from pump condition under the hydraulic oil that comes out of secondary component be stored in accumulator, work as accumulator
When middle pressure reaches setting value, direction valve events below simultaneously discharge the energy in accumulator and carry out auxiliary pumping unit system and adding
Pumping action when fast.
Claims (4)
- A kind of 1. double motor driving hydraulic pumping unit based on Hydrostatic drive technology, it is characterised in that including mechanical structure unit and Hydraulic power driver element, the mechanical structure unit include driving drum, frame, sucker rod 1 and sucker rod 2, steel wire rope, two Individual crown sheave；Driving drum is arranged on the ground among frame, and the steel wire rope on roller winds and passed through respectively in the opposite direction Cross after the crown sheave on frame top and be connected with two sucker rods, to being not suitable in nearer distance two oil wells of installation Oil-producing region, the sucker rod of driving drum side can be replaced by counterweight, other structures are constant, and the course of work is also constant；Described hydraulic power driver element is by three phase alternating current motor, bidirectional variable hydraulic pump, check valve, high-pressure overflow valve, side Formed to valve, high pressure accumulator, hydraulic motor/pump, decelerator, fuel tank and fluid pressure line；Described motor driving variable pump is simultaneously Output hydraulic oil flows into two secondary components after check valve and drives its operating, secondary component to constant pressure network, hydraulic oil Driving drum rotation is driven after decelerator, the oil-feed of hydraulic pump is returned to from the low-pressure hydraulic oil of two secondary component outflows Mouthful.
- 2. hydraulic pumping unit according to claim 1, it is characterised in that：The sucker rod or sucker rod of driving drum both sides It is arranged symmetrically with counterweight, and the steel wire rope on roller is around to opposite so that when the sucker rod of hydraulic motor/pump driving side rises When, the sucker rod of opposite side or with re-synchronize decline.
- 3. hydraulic pumping unit according to claim 1, it is characterised in that：Driving drum both sides are provided with two power set That is hydraulic motor/pump, when sucker rod accelerates oil pumping, two hydraulic motor/pump cooperations and by adjusting swash plate angle Spend to adjust the speed of sucker rod；When sucker rod enters constant velocity stage, only a hydraulic motor/pump provides power, in addition The swash plate angle of one hydraulic motor/pump returns to zero-bit not power output；When sucker rod enters the decelerating phase, two hydraulic pressure horses Up to/pump work in pump condition, reclaim the braking energy of sucker rod and be stored in accumulator, and controlled by adjusting swash plate angle Speed when system is slowed down.
- 4. fluid pressure drive device according to claim 3, it is characterised in that：Variable pump and secondary component hydraulic motor/pump Between form constant pressure network, after system pressure setting, the output work of system is only adjusted by adjusting the swash plate angle of secondary component Rate；Two high-pressure overflow valves are provided between constant pressure network to limit system maximum pressure, two lists are additionally provided between constant pressure network To valve, inlet port fuel feeding that the hydraulic oil in fuel tank can be by from check valve to hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710858779.4A CN107420072A (en) | 2017-09-21 | 2017-09-21 | A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710858779.4A CN107420072A (en) | 2017-09-21 | 2017-09-21 | A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107420072A true CN107420072A (en) | 2017-12-01 |
Family
ID=60433391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710858779.4A Pending CN107420072A (en) | 2017-09-21 | 2017-09-21 | A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107420072A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952636A (en) * | 2018-06-19 | 2018-12-07 | 门雨晴 | A kind of frequency control pumping unit with more well coordination functions |
| CN111810089A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Automatic stepless speed regulation vertical oil pumping machine and automatic stepless speed regulation control method of oil pumping machine |
| CN111810088A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Fault self-diagnosis vertical pumping unit and fault self-diagnosis control method for pumping unit |
| CN111810090A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Vertical rope chain transmission oil pumping machine |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2189218Y (en) * | 1994-01-27 | 1995-02-08 | 浙江大学 | Hydraulic oil pumping machine |
| CN101260796A (en) * | 2008-04-23 | 2008-09-10 | 大庆油田有限责任公司 | Underground balancing drum long stroke pumping unit |
| CN101324243A (en) * | 2008-06-26 | 2008-12-17 | 山东交通学院 | Energy storage and release control method of secondary regulation transmission system under non-constant pressure network |
| CN201865641U (en) * | 2010-11-28 | 2011-06-15 | 河南长江石油机械有限公司 | Long-stroke energy-saving double-well oil sucking machine with driver arranged at upper part |
| CN201924891U (en) * | 2010-12-30 | 2011-08-10 | 金成群 | Oil pumping unit integrating multiple wells into one machine |
| CN202810805U (en) * | 2012-10-29 | 2013-03-20 | 山东红帆能源科技有限公司 | Tower type double-well oil pumping unit |
| CN202866763U (en) * | 2012-09-07 | 2013-04-10 | 博世力士乐（常州）有限公司 | Power unit of hydraulic oil pumping machine and hydraulic oil pumping machine comprising power unit |
| CN203097844U (en) * | 2013-02-26 | 2013-07-31 | 博世力士乐（常州）有限公司 | Power unit of hydraulic pumping unit and hydraulic pumping unit comprising power unit |
| CN103742490A (en) * | 2014-01-26 | 2014-04-23 | 吉林大学 | Hybrid pumping unit |
| CN103899257A (en) * | 2014-04-23 | 2014-07-02 | 烟台大学 | Energy-saving workover rig based on double metering pumps or motors |
| CN103912224A (en) * | 2014-04-23 | 2014-07-09 | 烟台大学 | Constant displacement pump/motor tandem type energy-saving workover rig |
| CN104141644A (en) * | 2013-05-10 | 2014-11-12 | 博世力士乐（常州）有限公司 | Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit |
-
2017
- 2017-09-21 CN CN201710858779.4A patent/CN107420072A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2189218Y (en) * | 1994-01-27 | 1995-02-08 | 浙江大学 | Hydraulic oil pumping machine |
| CN101260796A (en) * | 2008-04-23 | 2008-09-10 | 大庆油田有限责任公司 | Underground balancing drum long stroke pumping unit |
| CN101324243A (en) * | 2008-06-26 | 2008-12-17 | 山东交通学院 | Energy storage and release control method of secondary regulation transmission system under non-constant pressure network |
| CN201865641U (en) * | 2010-11-28 | 2011-06-15 | 河南长江石油机械有限公司 | Long-stroke energy-saving double-well oil sucking machine with driver arranged at upper part |
| CN201924891U (en) * | 2010-12-30 | 2011-08-10 | 金成群 | Oil pumping unit integrating multiple wells into one machine |
| CN202866763U (en) * | 2012-09-07 | 2013-04-10 | 博世力士乐（常州）有限公司 | Power unit of hydraulic oil pumping machine and hydraulic oil pumping machine comprising power unit |
| CN202810805U (en) * | 2012-10-29 | 2013-03-20 | 山东红帆能源科技有限公司 | Tower type double-well oil pumping unit |
| CN203097844U (en) * | 2013-02-26 | 2013-07-31 | 博世力士乐（常州）有限公司 | Power unit of hydraulic pumping unit and hydraulic pumping unit comprising power unit |
| CN104141644A (en) * | 2013-05-10 | 2014-11-12 | 博世力士乐（常州）有限公司 | Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit |
| CN103742490A (en) * | 2014-01-26 | 2014-04-23 | 吉林大学 | Hybrid pumping unit |
| CN103899257A (en) * | 2014-04-23 | 2014-07-02 | 烟台大学 | Energy-saving workover rig based on double metering pumps or motors |
| CN103912224A (en) * | 2014-04-23 | 2014-07-09 | 烟台大学 | Constant displacement pump/motor tandem type energy-saving workover rig |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952636A (en) * | 2018-06-19 | 2018-12-07 | 门雨晴 | A kind of frequency control pumping unit with more well coordination functions |
| CN111810089A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Automatic stepless speed regulation vertical oil pumping machine and automatic stepless speed regulation control method of oil pumping machine |
| CN111810088A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Fault self-diagnosis vertical pumping unit and fault self-diagnosis control method for pumping unit |
| CN111810090A (en) * | 2020-06-19 | 2020-10-23 | 合立智能装备有限责任公司 | Vertical rope chain transmission oil pumping machine |
| CN111810090B (en) * | 2020-06-19 | 2022-08-30 | 合立智能装备有限责任公司 | Vertical rope chain transmission oil pumping unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107420072A (en) | A kind of double motor driving hydraulic pumping unit based on Hydrostatic drive technology | |
| CN100535454C (en) | Energy-store state-liquid driving device of secondary flow-regulation coupling hydraulic energy accumulator | |
| US5481873A (en) | Hydraulic actuating system for a fluid transfer apparatus | |
| CN1752406B (en) | Single crank double stroke flexible rope beam-pumping unit | |
| US20170067454A1 (en) | Compressed air energy storage system | |
| US20140007568A1 (en) | Power capture of wave energy converters | |
| CN105502234B (en) | Adjustable speed high thrust hydraulic elevator platform | |
| CN202280672U (en) | Flywheel energy storage type hydraulic reversing system | |
| CN104141644A (en) | Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit | |
| CN102900400B (en) | Compact hydraulic oil pumping machine adopting composited pneumatic-hydraulic cylinder | |
| CN105089574A (en) | Mobile trial production equipment pulled up by hydraulic cylinder | |
| US3867846A (en) | High slip prime mover for pumpjack apparatus | |
| US5827051A (en) | Regenerative hydraulic power transmission for down-hole pump | |
| CN1657393A (en) | Push and pull cylinder variable frequency energy-saving hydraulic elevator system of balancing load by accumulator loop | |
| CN107035736A (en) | Novel energy-conserving hydraulic pumping unit | |
| CN203097844U (en) | Power unit of hydraulic pumping unit and hydraulic pumping unit comprising power unit | |
| CN105064957A (en) | Hydraulic hybrid power driving system of beam-pumping unit and control method of hydraulic hybrid power driving system | |
| CN103967735A (en) | Hydraulic drive type slurry sucking and discharging device | |
| CN1869397A (en) | Oil-submersible magnetic suspension two-way plunger electric pump oil production method | |
| CN203239662U (en) | Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit | |
| CN102828729A (en) | Fully-automatic hydraulic pumping unit | |
| CN211174055U (en) | Variable-speed energy-storage hydraulic pumping unit | |
| CN213297915U (en) | Balance type balance hydraulic pumping unit | |
| CN111395439B (en) | Excavator movable arm-rotation closed hydraulic system and control method | |
| CN101702602B (en) | Motor starting device of oil extractor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171201 |