CN107387031B - A kind of single-well injection-production pump group - Google Patents
A kind of single-well injection-production pump group Download PDFInfo
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- CN107387031B CN107387031B CN201710720217.3A CN201710720217A CN107387031B CN 107387031 B CN107387031 B CN 107387031B CN 201710720217 A CN201710720217 A CN 201710720217A CN 107387031 B CN107387031 B CN 107387031B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000003921 oil Substances 0.000 claims description 112
- 238000010438 heat treatment Methods 0.000 claims description 41
- 239000004519 grease Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 23
- 230000008901 benefit Effects 0.000 abstract description 13
- 238000005406 washing Methods 0.000 abstract description 4
- 239000003129 oil well Substances 0.000 description 30
- 230000005484 gravity Effects 0.000 description 26
- 239000007788 liquid Substances 0.000 description 17
- 239000001993 wax Substances 0.000 description 17
- 238000011049 filling Methods 0.000 description 15
- 239000012530 fluid Substances 0.000 description 15
- 230000008021 deposition Effects 0.000 description 12
- 238000000926 separation method Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 8
- 238000005086 pumping Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- 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
- E21B43/128—Adaptation of pump systems with down-hole electric drives
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/006—Combined heating and pumping means
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a kind of single-well injection-production pump groups, including linear dynamo oil pump, linear motor water injecting pump and the oil water separator being set between the linear dynamo oil pump and the linear motor water injecting pump, the linear dynamo oil pump is set to the oil water separator top, and the linear motor water injecting pump is set to the oil water separator lower part；Single-well injection-production pump group provided by the invention can make single-well injection-production system pump highly effective and safe convenient and reliable, can be realized and do not stop well hot-washing wax remover automatically, to ensure the popularization of single-well injection-production technique, give full play to the economic benefit and social benefit of single-well injection-production technique.
Description
Technical field
The present invention relates to oilfield exploitation engineering device technique fields, more particularly to a kind of single-well injection-production pump group.
Background technique
After entering high water cut rate with oil field, oil field production in expose a series of contradictions, mainly include oil well because
Aqueous rising has been approached the economic exploitation limit, causes prematurely to stop production, recovery ratio is caused to decline；High output of oilwell water leads to water process
Scale increases, and processing equipment investment and operating cost are continuously increased；The leakage in output water treatment procedure and discharge cause simultaneously
Environmental protection pressure more and more prominent；Adopted between high for oil-containing, the content of wax, note well, increase conventional well-flushing the frequency and
Expense.The effective way to solve the above problems be existing oil well hoisting system is transformed and with downhole oil-water separation technology
It combines, forms downhole oil-water separation single-well injection-production system, the oil after separation is enumerated with downhole pump, is pumped with underground water-injection
By the water re-injection after separation, which can reduce the cost for oil production of high water cut oil field, improve oil field comprehensive benefit.
For the oil well pump of single-well injection-production system, water injecting pump, most basic requirement is:
(1), it is (right that downhole parameters such as output stressor layer, moisture content, oil water separator efficiency, particularly yield be can adapt to
Answer pump discharge) etc. dynamic change, and make timely and effectively dynamic response；
(2), output stressor layer energy can be made full use of；
(3), highly effective and safe is reliable；
(4), it is convenient for underground mounting arrangements；
(5), not wax deposition.
Oil well pump and water injecting pump currently used for single-well injection-production system substantially there are three types of, first is that common pumping unit (is knocked
Head machine) driving 2 series oil-well pumps come be respectively completed water filling, recover the oil；Second is that 2 concatenated subsurface progressive cavities are respectively completed
Water filling is recovered the oil；Third is that 2 underground electric submersible pumps come be respectively completed water filling, recover the oil.Certainly also there are oil well pump+underground electric submersible pump or well
The combination of lower screw pump+underground electric submersible pump come complete water filling, recover the oil.Oil well pump and water injecting pump most base for single-well injection-production system
This seeks to adaptation downhole parameters such as output stressor layer, moisture content, oil water separator efficiency, particularly yield (respective pump stream
Amount) etc. dynamic change, and can timely dynamic response.If for example water filling pump discharge can not dynamically adjust or possibility
Oil-containing water is recycled into underground, not only to block implanted layer, causes pump pressure to increase, more frighteningly causes the underground of unrepairable
Pollution.It is exactly that water content is excessive in oil well pump extraction crude oil, forms inefficient cycle, cause significant wastage, do not reach completely
To the dreamboat of single-well injection-production technique.
And note is respectively completed using 2 series oil-well pumps that pumping unit (kowtowing machine) drives in single-well injection-production system at present
Water, oil recovery.Not only system complex low efficiency, it is important to not be able to satisfy the dynamic change of yield (corresponding pump discharge).Although Chinese
" a kind of oil well pump of adjustable effective stroke " disclosed in patent 201611167280.0 in the artificial machinery adjustment in ground by taking out
Fuel feed pump plunger and pump barrel relative position, that is, change the method for dischargeable capacity to change pump discharge, but this method is lag
It is non-dynamic not in time, be not able to satisfy the requirement of underground oil-water dynamic change, and need shutdown adjustment.Simultaneously when pump work
A part of idle work is done, it is not energy-efficient.It is respectively completed water filling using 2 concatenated subsurface progressive cavities, recovers the oil, although can lead to
The method for crossing speed regulation changes the flow of pump, but the two pumps for filling the water, recovering the oil are same motor drivens, and flow is to become larger simultaneously
Or become smaller, the dynamic change requirement of underground oil-water can not be met.Output stressor layer rotates screw rod when subsurface progressive cavity fills the water
When axial force reaction force it is also very big, it is possible to harm is generated to pump." one kind is for same for Chinese patent 201420407147.8
The screw rod pump protector of well injection and extraction system " it is exactly to be developed to reduce influence of the output stressor layer to screw pump, it cannot
It can but instead be done harm to by it using output stressor layer.It is respectively completed water filling using 2 underground electric submersible pumps, recovers the oil, speed regulation can be passed through
Method adjust flow.But underground electric submersible pump is centrifugal multistage pump multiple centrifugal pump, does not first say that the high voltage small flow centrifugal efficiency of pump is very low, it is important to
The lift (pump pressure) that pumps changes simultaneously when pump discharge changes, if the lift (pump pressure) of pump is not able to satisfy water filling, oil recovery
It is required that running under lower pump efficiency then pumping and just voluntarily adjusting, motor, which may have a fever, even to be damaged, and reliability is difficult to ensure.
Influence of the output stressor layer to underground electric submersible pump simultaneously is also very big." it is suitable for same disclosed in Chinese patent 201420361109.3
Well infuses the inversion centrifugal multistage pump multiple centrifugal pump adopted " be exactly the influence that output stressor layer is overcome using thrust terminator to pump axial force, but multistage from
Once heart pump design typification, the axial force corresponding to it be it is certain, be difficult to adapt to the influence of strata pressure variation, and cannot
It can but instead be done harm to by it using output stressor layer.Certainly it is respectively combined use with three kinds of pumps, equally exists the above problem.
Normally, linear dynamo oil pump is easy for installation with its exclusive advantage such as underground, flow adjusting is simple, efficiently pacifies
Congruence should be applied in single-well injection-production system.But the application example of actually linear dynamo oil pump is lacked there are many
It falls into, such as influence of the fluid column gravity to linear motor rotor stress in flowline, while existing linear dynamo oil pump is not also complete
How complete solution certainly makes full use of the problem of output stressor layer, and there are also be exactly in single-well injection-production system mounting arrangements inconvenience, etc..
Chinese patent 201410176744.9 " three-tube type linear dynamo oil pump " uses the unilateral driving piston reciprocation of mover
Movement, there is output stressor layer energy cannot be made full use of, there is also fluid column gravity in flowline to linear motor rotor by
The problem of power influences, is performed simultaneously the unilateral driving of motor, does not utilize the arrangement installation of single-well injection-production down-hole string.
Chinese patent 201620132423.3 " a kind of linear dynamo oil pump and the pump housing " special pump body structure is utilizing
It is really effective to linear motor loading effect aspect to eliminate fluid column gravity in flowline for output stressor layer.But since mover is unilateral
Drive piston reciprocation movement in the bad mounting arrangements in underground, pump housing flow passage structure complex effects pump efficiency and reliability.
Chinese patent 201310482601.6 " a kind of motor-and-pump integrated downhole oil extraction device of magnetic suspension " is although very convenient well
Lower mounting arrangements also take full advantage of output stressor layer energy, but without fluid column gravity in elimination flowline to linear motor downlink
The influence of load.Maximum problem is that linear motor stator electric inner sheath use to connect plunger as pump barrel, linear motor rotor, and straight
Line motor stator inner sheath is actually the thin-wall slim pipe of thickness 1mm or so, and difficulty of processing is very big, wearability is bad, peace
Full reliability it is difficult to ensure that, the most serious is the fluid column gravity in flowline in down stroke to the inertia force of electric mover very
Greatly, it is entirely possible to cause motor damage, endanger the accidents such as underground equipment.
Meanwhile above-mentioned three kinds of linear dynamo oil pump patents are that electric mover is connect with plunger, virtually increase pump
Length, also just increase underground installation difficulty.
There is presently no the data of applying for down-hole linear motor water injecting pump.
Underground flow passage components wax deposition be it is inevitable, paraffin removal is necessary.It is unrelated with using which type of down-hole pump, but for
For single-well injection-production technique, especially three adopt after single-well injection-production technique for, wax deposition problem will be more serious.Because crude oil passes through
After oil water separator separation, the oil concentration that oil well pump is lifted is greatly improved, and the content of wax, concentration containing colloid are just high in oil, oil pump
Flow passage components (valve group, sealing, pump barrel, plunger, pipeline etc.) are just easy to wax deposition.Simultaneously because the separation of downhole separation system
Effect is limited, and the complicated component (such as polymer-bearing waste-water) in reinjected water will also result in water injecting pump flow passage components and be easier wax deposition；Also
It is usually all low pump speed operation, low pump speed operation, liquid flow exactly for the reliability for improving down-hole pump, especially positive displacement pump
Speed is low, suspended matter is easy precipitating, will also result in pump flow passage components and is easier wax deposition etc..It is that this is special to the influence of down-hole pump after wax deposition
Well known to industry personnel.Current effective method is to stop well hot wash, that is, inject high-temperature high pressure water from ground to underground
It is rinsed.Time-consuming for hot wash, costly, influence production.
How to play downhole linear electric motor oil-well pump is easy for installation, flow adjust it is simple, output layer can be made full use of
The reliable advantage of pressure energy, highly effective and safe, develops single-well injection-production systems pumps, solves the problems, such as flow passage components wax deposition, is ability
Field technique personnel's urgent problem to be solved.
Summary of the invention
The object of the present invention is to provide a kind of single-well injection-production pump groups, to solve the above-mentioned problems of the prior art, make same
Well injection and extraction system is convenient and reliable with pump highly effective and safe, can be realized and does not stop well hot-washing wax remover automatically, to ensure single-well injection-production technique
Popularization, give full play to the economic benefit and social benefit of single-well injection-production technique.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of single-well injection-production pump group, including linear dynamo oil pump, linear motor water injecting pump and is set to
Oil water separator between the linear dynamo oil pump and the linear motor water injecting pump, the linear dynamo oil pump setting
In the oil water separator top, the linear motor water injecting pump is set to the oil water separator lower part；
The linear dynamo oil pump includes first straight line motor stator, first straight line electric mover, the first cylinder sleeve, first
Fixed valve and the first travelling valve, first straight line motor stator both ends are connected with first cylinder sleeve and described first in turn and consolidate
Determine valve, first cylinder sleeve both ends connect with the first straight line motor stator and one end inner hole of first fixed valve respectively
It connecing, the inner hole of first cylinder sleeve is communicated with the inner hole of the first straight line motor stator and first fixed valve, and described
One linear motor rotor is the circular tube structure that an inside has the first grease access, and first travelling valve is set to described first
Linear motor rotor bottom, the first straight line electric mover are set to the first straight line motor stator and the first straight line
In the through-hole of first cylinder sleeve at motor stator both ends, the outer wall both ends of the first straight line electric mover and first cylinder
The first seal assembly is provided between set, the valve seat of first travelling valve is located at valve ball bottom, the valve of first fixed valve
Seat is located at valve ball bottom；
The linear motor water injecting pump includes second straight line motor stator, second straight line electric mover, the second cylinder sleeve, second
Fixed valve and the second travelling valve, second straight line motor stator both ends are connected with second cylinder sleeve and described second in turn and consolidate
Determine valve, second cylinder sleeve both ends connect with the second straight line motor stator and one end inner hole of second fixed valve respectively
It connecing, the inner hole of second cylinder sleeve is communicated with the inner hole of the second straight line motor stator and second fixed valve, and described
Two linear motor rotors are the circular tube structure that an inside has the second grease access, and second travelling valve is set to described second
Linear motor rotor bottom, the second straight line electric mover are set to the second straight line motor stator and the second straight line
In the through-hole of second cylinder sleeve at motor stator both ends, the outer wall both ends of the second straight line electric mover and second cylinder
The second seal assembly is provided between set, the valve seat of second travelling valve is located at the top of valve ball, the valve of second fixed valve
Seat is located at the top of valve ball.
Preferably, it is provided with the first heating element in the middle part of first outer wall of cylinder jachet, is set outside first heating element
Be equipped with the first sheath, first sheath one end is connect with the outer wall of first fixed valve, the first sheath other end with
The outer wall of the first straight line motor stator connects.
Preferably, first sheath and the junction of first fixed valve and first sheath and described first are straight
The junction of line motor stator is provided with sealing ring.
Preferably, first heating element is temperature controllable heating element.
Preferably, it is provided with the second heating element in the middle part of second outer wall of cylinder jachet, is set outside second heating element
Be equipped with the second sheath, second sheath one end is connect with the outer wall of second fixed valve, the second sheath other end with
The outer wall of the second straight line motor stator connects.
Preferably, second sheath and the junction of second fixed valve and second sheath and described second are straight
The junction of line motor stator is provided with sealing ring.
Preferably, second heating element is temperature controllable heating element.
Preferably, first cylinder sleeve at the linear dynamo oil pump both ends is symmetrical arranged.
Preferably, second cylinder sleeve at linear motor water injecting pump both ends is symmetrical arranged.
It preferably, further include the displacement being separately positioned on the linear dynamo oil pump and the linear motor water injecting pump
Sensor and velocity sensor, institute's displacement sensors and the velocity sensor are connect with a control system.
The present invention achieves following advantageous effects compared with the existing technology:
Single-well injection-production pump group provided by the invention, linear dynamo oil pump and linear motor water filling pump configuration are simple, underground
Easy for installation, flow is adjusted simply, and linear dynamo oil pump and linear motor can utilize output stressor layer when filling the water pump work
Energy, highly effective and safe are reliable, versatile, are provided with heating element on linear dynamo oil pump and linear motor water injecting pump,
It can be realized and not stop well hot-washing wax remover automatically, ensured the popularization of single-well injection-production technique, fully demonstrated single-well injection-production technique
Economic benefit and social benefit.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the integral installation distribution structure schematic diagram of single-well injection-production pump group in the present invention；
Fig. 2 is the structural schematic diagram of the linear dynamo oil pump in the present invention in single-well injection-production pump group；
Fig. 3 is the enlarged structure schematic diagram on the linear dynamo oil pump top in the present invention in single-well injection-production pump group；
Fig. 4 is the enlarged structure schematic diagram of the linear dynamo oil pump bottom end in the present invention in single-well injection-production pump group；
Fig. 5 is the structural schematic diagram of the linear motor water injecting pump in the present invention in single-well injection-production pump group；
Fig. 6 is the enlarged structure schematic diagram on the linear motor water injecting pump top in the present invention in single-well injection-production pump group；
Fig. 7 is the enlarged structure schematic diagram of the linear motor water injecting pump bottom end in the present invention in single-well injection-production pump group；
In figure: 1- linear dynamo oil pump, 2- linear motor water injecting pump, 3- oil water separator, 11- first straight line motor are fixed
Son, 12- first straight line electric mover, the first cylinder sleeve of 13-, the first fixed valve of 14-, the first travelling valve of 15-, the first grease of 16- are logical
Road, the first seal assembly of 17-, the first heating element of 18-, the first sheath of 19-, 21- second straight line motor stator, 22- second are straight
Line electric mover, the second cylinder sleeve of 23-, the second fixed valve of 24-, the second travelling valve of 25-, the second grease of 26- access, 27- second are close
Sealing assembly, the second heating element of 28-, the second sheath of 29-, A- well head, B- fill the water layer, C- grease line of demarcation, D- output layer, Q11-
Cavity volume under oil well pump, cavity volume under cavity volume, Q21- water injecting pump, cavity volume on Q22- water injecting pump on Q12- oil well pump.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is of the existing technology to solve the problems, such as the object of the present invention is to provide a kind of single-well injection-production pump group.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
The present invention provides a kind of single-well injection-production pump group, as shown in figs. 1-7, including linear dynamo oil pump 1, linear motor note
Water pump 2 and the oil water separator 3 being set between linear dynamo oil pump 1 and linear motor water injecting pump 2, specifically, straight-line electric
Machine oil well pump 1 is set to the top of oil water separator 3, and linear motor water injecting pump 2 is set to the lower part of oil water separator 3；
The wherein specific structure of linear dynamo oil pump 1 are as follows: including first straight line motor stator 11, first straight line motor
Sub 12, first cylinder sleeve 13, the first fixed valve 14 and the first travelling valve 15,11 both ends of first straight line motor stator are connected with the in turn
First cylinder sleeve 13 of one cylinder sleeve 13 and the first fixed valve 14,11 both ends of first straight line motor stator is symmetrical arranged, the first cylinder sleeve 13
Both ends are connect with one end inner hole of first straight line motor stator 11 and the first fixed valve 14 respectively, the inner hole of the first cylinder sleeve 13 and
One linear motor stator electric 11 and the inner hole of the first fixed valve 14 communicate, and first straight line electric mover 12 is an inside with the first oil
The circular tube structure of water passage 16, the first travelling valve 15 are set to 12 bottom of first straight line electric mover, first straight line electric mover
12 are set in the through-hole of first cylinder sleeve 13 at 11 both ends of first straight line motor stator 11 and first straight line motor stator, and first is straight
The first seal assembly 17 is provided between the outer wall both ends of line electric mover 12 and the first cylinder sleeve 13, to ensure first straight line motor
The valve seat of the sealing performance of 13 junction of mover 12 and the first cylinder sleeve, the first travelling valve 15 is located at valve ball bottom, the first fixed valve
14 valve seat is located at valve ball bottom；
It is provided with the first heating element 18 of temperature controllable in the middle part of the first cylinder sleeve 13 outer wall of linear dynamo oil pump 1, first
The first sheath 19 is provided with outside heating element 18,19 one end of the first sheath is connect with the outer wall of the first fixed valve 14, the first shield
It covers 19 other ends to connect with the outer wall of first straight line motor stator 11, also, the connection of the first sheath 19 and the first fixed valve 14
Place and the junction of the first sheath 19 and first straight line motor stator 11 are provided with sealing ring.
The specific structure of linear motor water injecting pump 2 is substantially identical as the structure of linear dynamo oil pump 1, only in fixed valve and
Distinct on the mounting means of travelling valve, specific linear motor water injecting pump 2 includes that second straight line motor stator 21, second is straight
Line electric mover 22, the second cylinder sleeve 23, the second fixed valve 24 and the second travelling valve 25,21 both ends of second straight line motor stator are successively
It is connected with the second cylinder sleeve 23 and the second fixed valve 24, the cylinder sleeve at 21 both ends of second straight line motor stator is symmetrical arranged, the second cylinder sleeve
23 both ends are connect with one end inner hole of second straight line motor stator 21 and the second fixed valve 24 respectively, the inner hole of the second cylinder sleeve 23 with
Second straight line motor stator 21 and the inner hole of the second fixed valve 24 communicate, and second straight line electric mover 22 is that an inside has second
The circular tube structure of grease access 26, the second travelling valve 25 are set to 22 bottom of second straight line electric mover, second straight line motor
In the through-hole for the second cylinder sleeve 23 that son 22 is set to 21 both ends of second straight line motor stator 21 and second straight line motor stator, second
The second seal assembly 27 is provided between the outer wall both ends of linear motor rotor 22 and the second cylinder sleeve 23, to ensure second straight line electricity
Motor-driven sub 22 and 23 junction of the second cylinder sleeve sealing performance, be different from linear dynamo oil pump 1, linear motor water injecting pump 2
The valve seat of second travelling valve 25 is located at the top of valve ball, and the valve seat of the second fixed valve 24 is located at the top of valve ball.
It is identical as linear dynamo oil pump 1 in the middle part of 23 outer wall of the second cylinder sleeve of linear motor water injecting pump 2, it is also equipped with adjustable
The heating element of temperature, is specifically named as the second heating element 28, is provided with the second sheath 29 outside the second heating element 28, and second
29 one end of sheath is connect with the outer wall of the second fixed valve 24, the outer wall of the second sheath 29 other end and second straight line motor stator 21
Connection, also, the junction and the second sheath 29 of the second sheath 29 and the second fixed valve 24 and second straight line motor stator 21
Junction is provided with sealing ring.
The present invention provides a kind of single-well injection-production pump group, in the specific application process, easy for installation in order to meet underground arrangement
Reliable to require, 1 bottom end of linear dynamo oil pump is mounted on 3 top of oil water separator, 1 top of linear dynamo oil pump with lead to
Flowline at well head A is connected, and 2 top of linear motor water injecting pump is mounted on 3 lower part of oil water separator, linear motor water injecting pump 2
Bottom end is connected with towards the water injection pipe at water filling layer B, and (oil water separator 3 is the prior art, and structure and working principle are no longer superfluous
It states).Crude oil is after the separation of oil water separator 3, oil stream to 3 top position of oil water separator, on the C of grease line of demarcation, that is,
The bottom of linear dynamo oil pump 1, water flow to 3 bottom position of oil water separator, under the C of grease line of demarcation, that is, straight-line electric
The top of machine water injecting pump 2.Linear dynamo oil pump 1 work when, oil from the bottom of linear dynamo oil pump 1 to top (low pressure to
High pressure), ground well head A is given rise to through flowline；When linear motor water injecting pump 2 works, water is from the top of linear motor water injecting pump 2
To bottom (low pressure to high pressure), underground implanted layer is recycled into through outlet pipe；By above-mentioned working method, single-well injection-production group is using straight
Line motor oil well pump 1 and linear motor water injecting pump 2 are respectively completed water filling, oil extraction operation.
In conjunction with the specific structure of linear dynamo oil pump 1, the specific working principle is as follows for linear dynamo oil pump 1:
When linear dynamo oil pump 1 works, first straight line electric mover 12 is moved upwards (up stroke), volume under oil well pump
Chamber Q11 volume becomes larger, pressure reduction, and the first fixed valve 14 of 1 lower section of linear dynamo oil pump is opened；Cavity volume on oil well pump
Q12 volume becomes smaller, pressure rise, and the first travelling valve 15 is closed, and the first fixed valve 14 of 1 top of linear dynamo oil pump is opened；
The separation oil of output layer D enters cavity volume Q11 under oil well pump in this trip, and the oil on oil well pump inside cavity volume Q12 is lifted
To well head A.First straight line electric mover 12 moves downward (down stroke), under oil well pump cavity volume Q11 volume become smaller, pressure liter
First fixed valve 14 of height, 1 lower section of linear dynamo oil pump is closed；On oil well pump cavity volume Q12 volume become larger, pressure reduction,
First travelling valve 15 is opened, and the first fixed valve 14 of 1 top of linear dynamo oil pump is closed.Under oil well pump inside cavity volume Q11
First grease access 16 of the oil through first straight line electric mover 12 enter on oil well pump in cavity volume Q12；First straight line motor
Mover 12 and so on moves, and realizes the oil pumping function of linear dynamo oil pump 1.
Motor power output is as follows when linear dynamo oil pump 1 moves:
Down stroke: Fys+π/4D2PC=GD+GY+f1+π/4D2Py
Up stroke: Fyx+GD+GYQ+π/4(D2-d2)PQ=π/4 (D2-d2)PQ+f2
Fyx+(GD+GYQ)=f2
Fys--- power of the motor to first straight line electric mover 12 when 1 up stroke of linear dynamo oil pump
Fyx--- power of the motor to first straight line electric mover 12 when 1 down stroke of linear dynamo oil pump
PC--- underground output layer D pressure GD--- 12 gravity of first straight line electric mover
GY--- fluid column gravity in 14 top of the first fixed valve to well head A flowline of 1 lower section of linear dynamo oil pump
GYQ--- liquid gravity in cavity volume Q12 on oil well pump
Py--- 1 discharge pressure f of linear dynamo oil pump1f2--- 13 internal diameter of the first cylinder sleeve of frictional force D---
16 diameter of the first grease of d--- access
When force analysis when moving from linear dynamo oil pump 1 can be seen that up stroke, output layer D pressure PCWork
Power thrusts are consistent with motor power output direction, that is to say, that output layer D pressure energy is taken full advantage of when pump work.Down stroke
When, motor power output need to only overcome frictional force, and the gravity G of first straight line electric mover 12D, cavity volume on oil well pump
Liquid gravity G in Q12YQ12 1 downward power of first straight line electric mover, thus motor power output very little are returned, it is energy-efficient,
More crucially the first fixed valve 14 of 1 top of linear dynamo oil pump is closed when down stroke, avoids linear dynamo oil pump 1
Fluid column gravity G in 14 top of the first fixed valve to well head A flowline of topYGive first straight line electric mover 12 bigger inertia
Power.In fact, general pump hangs first fixed valve 14 top of the height above 1000m or so, linear dynamo oil pump 1 to well head
A flowline is very long, intraluminal fluid column gravity GYAlso very big, and first straight line electric mover 12 does not need very big power when down stroke,
If not fluid column gravity GYIsolation, then when first straight line 12 down stroke of electric mover, it will be in fluid column gravity GYEffect is lower to be added
Speed movement, it is necessary to the downstream rate of first straight line electric mover 12 is constrained to one back-emf of linear motor, not so first
12 stall of linear motor rotor will cause underground equipment damage, and back-emf endangers very greatly for motor.Meanwhile stopping in power-off
When pump or for some reason termination of pumping, fluid column gravity G is also avoidedYCause hurtling down for first straight line electric mover 12.Present invention installation
14 effective solution of the first fixed valve on the top the cavity volume Q12 fluid column gravity G on oil well pumpYTo first straight line electric mover
Influence when 12 downlink substantially increases the safety of pump.
In conjunction with the specific structure of linear motor water injecting pump 2, the specific working principle is as follows for linear motor water injecting pump 2:
When linear motor water injecting pump 2 works, second straight line electric mover 22 is moved upwards (up stroke), volume under water injecting pump
Chamber Q21 volume becomes larger, pressure reduction, and the second fixed valve 24 of 2 lower section of linear motor water injecting pump is closed, cavity volume on water injecting pump
Q22 volume becomes smaller, pressure rise, and the second travelling valve 25 is opened, and the second fixed valve 24 of 2 top of linear motor water injecting pump is closed,
Water on water injecting pump in cavity volume Q22 enters under water injecting pump in cavity volume Q21 through the second grease access 26.Second straight line motor
Son 22 moves downward (down stroke), under water injecting pump cavity volume Q21 volume become smaller, pressure rise, 2 lower section of linear motor water injecting pump
Second fixed valve 24 is opened；On water injecting pump cavity volume Q22 volume become larger, pressure reduction, the second travelling valve 25 close, linear motor
Second fixed valve 24 of 2 top of water injecting pump is opened.Output layer D separation water enters cavity volume Q22 on water injecting pump, volume under water injecting pump
Water inside chamber Q21 is recycled into water filling layer B；Second straight line electric mover 22 and so on moves, and realizes the note of water injecting pump
Water function.
Motor power output is as follows when linear motor water injecting pump 2 moves:
Up stroke: Fss+π/4(D2-d2)PQ=GD+GQ+f1+π/4(D2-d2)PQ
Fss=GD+GQ+f1
Down stroke: Fsx+GD+GYS+π/4D2PC=π/4D2Pz+f2
Fss--- power of the motor to second straight line electric mover 22 when linear motor 2 up stroke of water injecting pump
Fsx--- power of the motor to second straight line electric mover 22 when linear motor 2 down stroke of water injecting pump
PC--- underground output layer D pressure GD--- 22 gravity of second straight line electric mover
GYS--- the fluid column gravity of the 24 top water inlet pipe of the second fixed valve of 2 top of linear motor water injecting pump
GYQ--- liquid gravity in cavity volume Q22 on water injecting pump
Pz--- 2 discharge pressure f of linear motor water injecting pump1f2--- 23 internal diameter of the second cylinder sleeve of frictional force D---
26 diameter of the second grease of d--- access
When force analysis when moving from linear motor water injecting pump 2 can be seen that down stroke, output layer D pressure PCWork
Power thrusts are consistent with motor power output direction, that is to say, that output layer D pressure energy is taken full advantage of when pump work.And the
The gravity G of two linear motor rotors 22D, liquid in pipe gravity GYS22 1 downward power of second straight line electric mover are returned, because
And motor power output is greatly reduced, energy conservation.When up stroke, motor power output need to only overcome frictional force and second straight line electric mover 22
Liquid gravity in cavity volume Q22 on gravity, water injecting pump.More crucially 2 top of linear motor water injecting pump when up stroke
Second fixed valve 24 is closed, and avoids 24 top of the second fixed valve of the top of linear motor water injecting pump 2 to water inlet pipe fluid column gravity
GYSGive second straight line electric mover 22 bigger reaction force, it is energy-efficient.Meanwhile when powering off termination of pumping or termination of pumping for some reason,
Avoid fluid column gravity GYHurtling down for second straight line electric mover 22 is caused, the safety of pump is substantially increased.
For being mounted on first heating element 18 and the second heating element 28 in 23 outside of the first cylinder sleeve 13 and the second cylinder sleeve,
Since the first heating element 18 and the second heating element 28 are identical, it is briefly clearly hereafter referred to collectively as heating element in order to state, electricity
Heating partial composed by thermal element and the first sheath 19 and the second sheath 29 be it is relatively independent, heating element is placed in first
In the sealing space of cylinder sleeve 13 and the first sheath 19 and the second cylinder sleeve 23 and the second sheath 29 composition, heating element temperature is can
It adjusts, the power supply line of power supply line and linear motor part is also to separate.The heat of heating element passes through the first cylinder sleeve
13 and second cylinder sleeve 23 be transmitted to cavity volume Q11 under oil well pump, cavity volume Q21 and note under cavity volume Q12, water injecting pump on oil well pump
On water pump in cavity volume Q22, liquid is heated by each cavity volume, and the liquid being heated is given rise to well head A or by re-injection
When to water filling layer B, the wax deposition on all flow passage components surfaces that high-temp liquid flows through a little be melted, be washed until removing
Completely.
When the flow of linear dynamo oil pump 1 or linear motor water injecting pump 2, discharge pressure, current of electric etc. due to wax deposition,
When fouling causes unusual fluctuations, the corresponding sensor in underground can be transferred to data ground control system, ground control system
Plug-in is judged automatically powers to heating element, and judges automatically adjusting by the feedback signal of the multiple temperature sensors in underground
The temperature of heating element, within the temperature range of pumping liquid can be heated to setting, the liquid after being heated flows through straight-line electric
The flow passage components of machine oil well pump 1 or linear motor water injecting pump 2 rinse the wax deposition on flow passage components surface, to realize hot-washing wax remover
Purpose.By taking linear dynamo oil pump 1 as an example, when up stroke liquid enter under oil well pump during cavity volume Q11 by once plus
Heat, when down stroke, liquid enters on oil well pump during cavity volume Q12 by reheating, is then lifted to well head A.Liquid
Flow through place each valve group, to the surfaces such as the flowline of well head A wax deposition fouling a little be melted, be washed until clear
It removes.
Linear dynamo oil pump 1 or 2 running parameter of linear motor water injecting pump normally stop heating afterwards.Certain linear motor is taken out
Heating element on oil pump 1 and linear motor water injecting pump 2 can work at the same time, work when can also be different, specifically by straight line
What motor oil well pump 1 or the corresponding ground control segment of linear motor water injecting pump 2 automatically controlled.To linear dynamo oil pump 1
Speech can reduce viscosity of crude by heating, improve its mobility, be more suitable for the lifting of viscous crude and high waxy oil.To straight-line electric
For machine water injecting pump 2, high temperature is also given some macromolecule components (such as polymer, chemical agent) in return water and is cracked,
Also dissipation has been carried out to the microorganism in return water, effective low pollution for avoiding return water to stratum.
Actually since down-hole liquid itself is that have certain temperature (generally at 50 DEG C or so), with linear dynamo oil pump
For 1, the purpose of heating is to make liquid also can guarantee temperature required for dewaxing (generally on 60 DEG C of left sides when flowing to well head A
It is right), thermal capacity does not need too greatly, so the power of heating element is also not very big.
The oil water separator 3 of single-well injection-production pump group is usually the graininess impurity such as sand grains in crude oil by Gravity Separation
Deng because quality it is big, can be deposited in the collection sandpipe of 3 lower part of oil water separator, it is miscellaneous almost without graininess in oily (water) after separation
Matter not will cause mechanical wear, the first seal assembly 17 and the second seal assembly that the present invention uses to the flow passage components in pump
27 can effectively prevent high-pressure leakage, improve pump efficiency, and the first seal assembly 17, the second seal assembly 27, the first cylinder sleeve
13, the second cylinder sleeve 23, the first travelling valve 15, the second travelling valve 25, the first fixed valve 14 and the second fixed valve 24 are function lists
One vulnerable part can easily improve its service life by the process means such as material, heat treatment, processing economy, to protect
The highly effective and safe for having demonstrate,proved pump is reliable.The first seal assembly 17, the second seal assembly 27, the first cylinder sleeve 13 and the second cylinder sleeve 23 of pump
It is all provided with and is set to structure the same up and down, can be improved the versatility of pump components, be easily installed working service.
First travelling valve 15 and the second travelling valve 25 may be mounted at the lower part of linear motor rotor, also may be mounted at straight
The top of line electric mover also may be mounted in the grease access of linear motor rotor.It even can be linear motor rotor
Any position in centre for being mounted in linear motor rotor is disconnected, can be realized the function of travelling valve.
Single-well injection-production linear dynamo oil pump 1 and linear motor water injecting pump 2 are suitable by being mounted on underground in underground work
When the signals such as displacement, velocity sensor on the pressure of position, flow, grease liquid level sensor, oil-water interface tool and pump pass
Be defeated by ground control system, dynamic accurately by changing the stroke length pumped, pump speed adjusts separately linear dynamo oil pump 1 and
The parameters such as the flow of linear motor water injecting pump 2, to adapt to the requirement of downhole parameters dynamic change.In the present invention outside cylindric pump
Shape adds center oil water passage, easily in underground mounting arrangements.
Invention applies a specific example illustrates the principle and implementation of the invention, above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.To sum up, the content of the present specification should not manage
Solution is limitation of the present invention.
Claims (10)
1. a kind of single-well injection-production pump group, it is characterised in that: including linear dynamo oil pump (1), linear motor water injecting pump (2) and set
The oil water separator (3) being placed between the linear dynamo oil pump (1) and the linear motor water injecting pump (2), the straight line
Motor oil well pump (1) is set to the oil water separator (3) top, and the linear motor water injecting pump (2) is set to the grease
Separator (3) lower part；
The linear dynamo oil pump (1) includes first straight line motor stator (11), first straight line electric mover (12), the first cylinder
Set (13), the first fixed valve (14) and the first travelling valve (15), first straight line motor stator (11) both ends are connected in turn
First cylinder sleeve (13) and first fixed valve (14), the first cylinder sleeve (13) both ends are electric with the first straight line respectively
Machine stator (11) is connected with one end inner hole of first fixed valve (14), the inner hole and described first of first cylinder sleeve (13)
Linear motor stator electric (11) and the inner hole of first fixed valve (14) communicate, and the first straight line electric mover (12) is in one
Portion has the circular tube structure of the first grease access (16), and first travelling valve (15) is set to the first straight line electric mover
(12) bottom, the first straight line electric mover (12) are set to the first straight line motor stator (11) and the first straight line
In the through-hole of first cylinder sleeve (13) at motor stator (11) both ends, the outer wall both ends of the first straight line electric mover (12)
It is provided with the first seal assembly (17) between first cylinder sleeve (13), the valve seat of first travelling valve (15) is located at valve ball
The valve seat of bottom, first fixed valve (14) is located at valve ball bottom；
The linear motor water injecting pump (2) includes second straight line motor stator (21), second straight line electric mover (22), the second cylinder
Set (23), the second fixed valve (24) and the second travelling valve (25), second straight line motor stator (21) both ends are connected in turn
Second cylinder sleeve (23) and second fixed valve (24), the second cylinder sleeve (23) both ends are electric with the second straight line respectively
Machine stator (21) is connected with one end inner hole of second fixed valve (24), the inner hole and described second of second cylinder sleeve (23)
Linear motor stator electric (21) and the inner hole of second fixed valve (24) communicate, and the second straight line electric mover (22) is in one
Portion has the circular tube structure of the second grease access (26), and second travelling valve (25) is set to the second straight line electric mover
(22) bottom, the second straight line electric mover (22) are set to the second straight line motor stator (21) and the second straight line
In the through-hole of second cylinder sleeve (23) at motor stator (21) both ends, the outer wall both ends of the second straight line electric mover (22)
It is provided with the second seal assembly (27) between second cylinder sleeve (23), the valve seat of second travelling valve (25) is located at valve ball
Top, the valve seat of second fixed valve (24) are located at the top of valve ball.
2. single-well injection-production pump group according to claim 1, it is characterised in that: setting in the middle part of the first cylinder sleeve (13) outer wall
Have the first heating element (18), is provided with the first sheath (19) outside first heating element (18), first sheath
(19) one end is connect with the outer wall of first fixed valve (14), the first sheath (19) other end and first straight line electricity
The outer wall of machine stator (11) connects.
3. single-well injection-production pump group according to claim 2, it is characterised in that: first sheath (19) is solid with described first
The junction and first sheath (19) and the junction of the first straight line motor stator (11) for determining valve (14) are provided with
Sealing ring.
4. single-well injection-production pump group according to claim 3, it is characterised in that: first heating element (18) is temperature controllable
Heating element.
5. single-well injection-production pump group according to claim 1, it is characterised in that: setting in the middle part of the second cylinder sleeve (23) outer wall
Have the second heating element (28), is provided with the second sheath (29) outside second heating element (28), second sheath
(29) one end is connect with the outer wall of second fixed valve (24), the second sheath (29) other end and second straight line electricity
The outer wall of machine stator (21) connects.
6. single-well injection-production pump group according to claim 5, it is characterised in that: second sheath (29) is solid with described second
The junction and second sheath (29) and the junction of the second straight line motor stator (21) for determining valve (24) are provided with
Sealing ring.
7. single-well injection-production pump group according to claim 6, it is characterised in that: second heating element (28) is temperature controllable
Heating element.
8. single-well injection-production pump group according to claim 1, it is characterised in that: linear dynamo oil pump (1) both ends
First cylinder sleeve (13) is symmetrical arranged.
9. single-well injection-production pump group according to claim 1, it is characterised in that: linear motor water injecting pump (2) both ends
Second cylinder sleeve (23) is symmetrical arranged.
10. single-well injection-production pump group according to claim 1, it is characterised in that: the linear dynamo oil pump (1) and described
Displacement sensor and velocity sensor are provided on linear motor water injecting pump (2), institute's displacement sensors and the speed pass
Sensor is connect with a control system.
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| CN201710720217.3A CN107387031B (en) | 2017-08-21 | 2017-08-21 | A kind of single-well injection-production pump group |
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| CN201710720217.3A CN107387031B (en) | 2017-08-21 | 2017-08-21 | A kind of single-well injection-production pump group |
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| CN110984913B (en) * | 2018-03-20 | 2021-09-17 | 东营市丰润通科技发展有限公司 | Self-generating wax-proof device and method for screw pump oil well |
| CN109973371A (en) * | 2019-05-13 | 2019-07-05 | 西南石油大学 | Tandem double-acting injection-production pump for high water-cut oil wells |
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| CN101793138B (en) * | 2010-03-10 | 2013-06-26 | 大庆油田有限责任公司 | Hydrocyclone and screw pump combined downhole oil-water separation method |
| CN102996103A (en) * | 2012-12-12 | 2013-03-27 | 中国石油大学(华东) | Co-well extracting-pouring device adopting downhole oil-water separation for large-dimension sleeve of offshore oil well |
| CN203463248U (en) * | 2013-08-29 | 2014-03-05 | 宝鸡石油机械有限责任公司 | Double-acting multi-cylinder mud pump directly driven by linear motors |
| CN104100523B (en) * | 2014-07-01 | 2019-01-11 | 天津荣亨集团股份有限公司 | The driving protection device that screw rod re-injection pumps in single-well injection-production unit |
| CN104948141B (en) * | 2015-06-05 | 2017-12-05 | 中国石油天然气股份有限公司 | Same well production and injection device |
| US9991836B2 (en) * | 2015-10-16 | 2018-06-05 | Baker Hughes Incorporated | Systems and methods for identifying end stops in a linear motor |
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