US3364864A - Pumping device for deep oil wells - Google Patents

Pumping device for deep oil wells Download PDF

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Publication number
US3364864A
US3364864A US440455A US44045565A US3364864A US 3364864 A US3364864 A US 3364864A US 440455 A US440455 A US 440455A US 44045565 A US44045565 A US 44045565A US 3364864 A US3364864 A US 3364864A
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United States
Prior art keywords
armature
electric motor
motor
pump
electric
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Expired - Lifetime
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US440455A
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English (en)
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Gheorghe Petrescu
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/025—Asynchronous motors
    • 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
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
    • 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
    • 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
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/12—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having free plunger lifting the fluid to the surface
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means

Definitions

  • the pumping device disclosed in US. Patent No. 1,740,- 003 has the further disadvantage that the pump, which is mounted within the mobile armature of the electric motor, requires, of course, an increase in the outside diameter of the motor itself, which reduces the possibilities of using this device for pumping oil in deep wells, where only small diameter casings are used.
  • the stator of the motor consists of annular sections, there is furthermore an inherent disadvantage in the construction of the electric motor itself because the magnetic force lines of the magnetic multipolar field act transversely to these annular sections by passing through the spaces between the magnetic sheets, which means an increase of the air gap, which in turn has a negative effect on the maximum power output of the device, the power requirement for the starting forces, etc.
  • the requirement for producing large forces during each direction reversal of the pump by electrical means has been eliminated.
  • a hydraulic device for starting and reaching the normal speed This hydraulic drive is effectuated by the pressure caused by the pumped liquid, which is applied to one piston of the device, while simultaneously being eliminated at the other, in accordance with the direction of the moving armature of the device.
  • one of the pumps is being energized by a hydraulic force, while the other is idling. Consequently, despite the fact that the device has an alternating rectilinear motion, the electric motor is operating, insofar as its power input is concerned, with a practically constant speed and with rigorously maintained constant traction forces.
  • FIG. 1 is a cross-sectional elevation illustrating a general set up of the pumping device of this invention
  • FIG. 2 is a transverse cross-section through one embodiment of an electric motor of the device of this invention
  • FIG. 3 is a longitudinal cross-section through the electric motor illustrated in FIG. 2;
  • FIG. 4 is a cross-sectional view of another embodiment of an electric motor in accordance with this invention.
  • FIGS. 5a and 5b are cross-sectional elevations illustrating schematically the electric and hydraulic drives of the device of this invention.
  • FIG. 6 is an electric circuit diagram for the motion direction changing means of the device.
  • the electric motor M which drives two piston pumps P and P which have alternating active strokes, one having an ascending stroke while the other has a descending stroke.
  • both of the strokes of the electric motor M are active, which fact reduces to a halt" the power loses in the motor winding when comparing the device of this invention with these prior art devices employing a single pump which for the same output has one active stroke and one idle stroke.
  • the housing shell of the motor M is made fluidtight and is filled with :air or with insulating oil, which is serving as cooling fluid as well.
  • the electric motor M is of the poly-'phase indu'ction type having its secondary mounted in a squirrel cage.
  • a cylindrical housing 1 in which there are mounted several stators S S each of which is composed of a plurality of radially disposed sheets.
  • Each stator S is provided with radially extending teeth and slots.
  • the coils for an armature A are mounted within the slots.
  • the armature A is axially mounted in the motor M and is, due to the action of the shifting magnetic field produced in the air gaps, alternatively moving in the vertical direction.
  • the electric motor M is provided with a great number of pole pairs, having a poler pitch as short as possible, and having thus the smallest possible number of slots per pole and phase, preferably only one slot.
  • the oil terminals 3 of the statoric winding are obtained by passing the winding from a stator S slot to a stator S slot, inasmuch to allow the magnetic flux lines of force to pass farther from a stator to another, alternating the direction from a pole to another.
  • the mobile armature A is provided with two ladder shaped plane cages, constituted each from active bars 4 placed inside the slots and with hte ends welded to two rectilineal strips 5, which act as the rotor rings for the squirrel cage type motor.
  • the mobile armature A extends beyond the stator a distance equal to the stroke length, and is alternatively moving on two slide bars 6 secured to the two stators, causing, by means of rods 7, the movement of the pistons 8.
  • the motor winding is cooled by displacing in an inverse direction the fluid from inside the housing.
  • the oil pumped by the lower pump is delivered upwardly through the pipe lines 9.
  • the motor housing is provided with two stufiing-boxes 10. For the balancing of the pressure from the housing with the external pressure adequate balancing devices are used.
  • connection between the two pumps and the tubing string 11, is made by means of a pipe line 12 and the suction of the upper pump is eifected via the pipe 13.
  • the stufling boxes 10, are provided in order to absorb shocks when the pump exceeds its normal stroke.
  • the coil of one slot is connnected in series with the coil of the other slots shifted so that a predetermined number of slots correspond to a pair of poles. Consequently, the winding is composed of coils corresponding to the number of phases and to the number ofpoles, of which half are connected inversely to the other half, in order to obtain alternatively the north and south polarities.
  • the manufacturing of the winding can be simplified by choosing completely open slots and pressing successively from the exterior, and in .a radial direction, the six stators upon the winding previously prepared on a cylindrical mandrel with a corresponding diameter.
  • the mobile armature A has a length equal to that of the stators plus the length of the stroke. It is displaced alternatively, being guided by the rollers r r secured to both ends of the stators. It efi'ectuates the reciprocal motions of the pistons via the rod 7 and also etlectuates the displacement on the inverse sides of the cooling liquid present in the radial spaces U U near the coil terminals 15.
  • the mobile armature A for the embodiment of FIG. 4 has a cylindrical shape being made out of sheets or solid steel and is provided with teeth and slots which contain the Winding consisting of a single annular conductor for each slot.
  • the armature A forms a cylindrical cage having annular bars. 7
  • a channel 11 In the center of the mobile armature A there is provided a channel 11, which ensures the cooling of the mobile armature A by means of the circulating liquid.
  • the housing shell 1 of the motor illustrated in FIG. 4 has a length equal to that of one of the stators 8 -8 plus double the length of the stroke so as to be able to accommodate the stroke of the mobile armature A.
  • the housing shell 1 of the motor is sealed at its top and bottom by the stufiing boxes 10 from the liquid under pressure in the well hole.
  • the housing shell 1 includes means for permitting an expansion of the cooling liquid.
  • damping springs 14 are coaxially mounted on the upper and lower rods 7.
  • Both pumps P and P are connected via ducts 9 to the tubing 11, suction by pumps taking place through the intake ducts.
  • FIGS. 5a and 5b there are illustrated the electrohydraulic driving systems which allow starting at the end of the strokes when the motion direction is reversed, by using the hydraulic pressure exerted by the pumped oil column and acting upon the pump pistons.
  • FIG. 5a there is illustrated an embodiment in which both the pumps P and P are assembled in a single cylinder 17, mounted above the electric motor M and being provided at their respective stroke ends with two discharge valves 18 and 18' and two suction valves 19 and 19, and toward the middle of the common piston housing, with two valveless windows 20 and 20, which are shut and opened directly by the motion of the respective pistons.
  • the electric pump acted on by the hydraulic drive operates as follows:
  • the cylinders of the pump are separated from the electric motor housing by using two separate stuffing boxes, one (24) adjacent to the electric motor and the other (25) adjacent to the pump.
  • the two pumping compartments and the appurtenant valves are arranged adjacent to each other at the middle of the cylinder of the pumps, being separated by a common wall, through which the actuating rod of the upper piston is passing and which needs only a single stufiing box, the sealing means of which are under pressure, and the direction of which continuously alternates which reduces the possibility of leakage of liquid under pressure therethrough.
  • the pumping compartments with their valves are placed at opposite ends of the pump cylinders, and require two boxes which are under the high oil column pressure.
  • the two pumping compartments with their valves are placed between the two cylinders of the pump, being separated by a common wall through which passes the driv- 6 ing rod for both pistons and which needs only one stuffing-box working under high pressure.
  • a static switching device As control means for interrupting and reestablishing the current in the electric motor winding, when the running direction thereof is changed, a static switching device is used, which in case of the construction illustrated in the electric circuit diagram of FIG. 6 uses saturant reactors.
  • K represents the automatic switch of the device;
  • u, v and w represent the three phases of the secondary winding of the transformer T feeding the electric pump from ground level the primary winding of which is connected by a three conductor cable, the windings Su, Sv and Sw of the electric motor stator.
  • the saturant reactors Rv and Rw are mounted in the phases v and w.
  • the magnetic cores 27 and 27' shift with the movement of the mobile armature A of the electric motor, so that when the armature arrives at a certain established distance from the up-stroke, respectively the down-stroke end, the corresponding magnetic core is introduced into the coil 26 (respectively 26'), producing an increase in the reactance of the coil, which reduces to about Zero the current in the feeding circuit of the group transformer-rectifier TR, causing the suppression of the exciting of the saturant reactors Rv and Rw and thereby introducing in the circuit of these two phases reactances which practically cancel the three-phase feeding current of the electric motor.
  • the magnet core is pushed out of the respective coil 26, 26 and the current is reestablished in the exciting circuit of the saturant reactors R11 and Rw, as well as in the three-phase electric motor feeding circuit.
  • the reversal of the electric motor magnetic field shifting direction at stroke ends is realized by reversing the phases 1/ and w by means of a switch 28, actuated by the movement of the mobile armature A shifting in the interval in which the current is interrupted in the circuit, the switching of the phases being realized without any current.
  • the automatic break switch K is provided with zero voltage relays in each one of its three phases.
  • control means can also be used when instead of using the saturant reactors Rv and Rw, electronic devices (i.e. transistors) are used which would be placed either at the surface or inside the electric motor housing.
  • electronic devices i.e. transistors
  • the discharge line of the electric pump is provided with a three-way valve 29 FIGS. 5a and 5b, controlled by an electromagnetic relay 3%) having zero voltage, mounted on the phase 1!.
  • the relay 30 unlocks the cam 33 and the electric pump is placed again in starting position by the hydraulic drive, as it is at each motion direction reversal.
  • two oppositely working valves can be used, one. of these valves would be built in the discharge pipe in the tubing and the other in the outside discharge duct, the valves being controlled by a common voltage relay or by two different relays, so that when the voltage fails, the discharge valve toward the tubing will be closed and the discharge valve toward the outside will be open, and when the voltage is reestablished the discharge valve toward the outside is closed and the discharge valve toward the tubing is opened.
  • the pumping device of this invention can be constructed with only one pump.
  • the motor is used for lifting the mobile armature and at the down-stroke the pump is driven as well by the force produced by the motor and also by the weight of the mobile armature.
  • the electric motor can be built as a synchronous motor, replacing thereby the mobile armature with a cage with a mobile armature of similar construction, but provided with excitation coils mounted in slots and fed with direct current, obtained from a transformer-rectifier group connected in parallel with the electric motor feeding circuit, or from a generator, driven by the mobile armature motion.
  • the power factor can have a value close to one, the losses in stator windings for the same useful power are reduced to less than a half, because due to the great number of pole pairs, the value of the power factor in such an embodiment is under 0.7.
  • the electric motor power is increased with 40-50% by comparison to an embodiment using an asynchronous motor.
  • the air gap of the synchronous motor can be considerably increased, a fact which facilitates the manufacture of stators of great length and respectively of more powerful motors.
  • an electric motor having a pumping frequency of 30 double strokes per minute (the length of stroke 3.50 m.)
  • the length of stroke 3.50 m. which can pump 80 tons of oil in 24 hours from a depth of 1500 m. and which can be introduced in a casing having an interior diameter of 120 mm.
  • the total electric motor length is not greater than 10 In.
  • a pumping system adapted to be mounted in the casing of Wells, comprising in combination, an electric induction motor, having an axially reciprocally moving armature operatively mounted in said motor; a doublepumping means reciprocally mounted in said casing, and
  • said doublepumping means include means for discharging liquid via said casing and also include means for exerting on said armature pressure produced by the column of discharging liquid immediately after reversal of motion of said armature, in the direction of movement thereof; and an electric. power source operatively. connected to said electric motor.
  • said double-pumping means comprise a pump housing and two pistons coaxially reciprocally mounted therein, said two pistons being respectively connected to each other and to said armature of said electric motor by means of an axially extending piston rod, whereby immediately after reversal of motion, one of said two pistons is idling whereas the other one is under pressure by said column of discharging liquid.
  • said pump housing (1) of said electric motor is cylindrical
  • said motor includes a plurality of stators (e.g. six stators 8 -8 which are made out of sheet packs and which are disposed on a circle in said housing (1) and have slots (3) in which a plurality of annular coils (4) are mounted, each coil passing from the slot of one stator directly into the slot of the adjacent stator, said plurality of coils being connected in series so that each coil is mounted in a pair of oppositely positioned stators of said plurality of stators, so that when said plurality of coils are connected to said electric power source so as to form windings which are fed with three-phase currents a magnetic field will be produced in said plurality of stators with an alternating rectilineal motion which will actuate upon said armature A, the latter being provided with a cage constituted out of annular conductors which are mounted in slots of said armature A.
  • stators e.g. six stators 8 -8 which are made out of sheet packs and which are disposed on
  • a cooling fiuid insulating oil or air
  • a pumping system as set forth in claim 6, including means for interrupting and reversing the current from said source of electric power, the latter being of the threephase alternating current type and including three conductors (U, V. W) which are operatively connected to 10 said electric motor, two saturant reactors (Rv, Rw) respectively operatively connected to two conductors (V, W) of said three conductors, the third conductor (U) of said three conductors being connected to a control circuit means, the latter being electrically connected to the mass of said pump housing and said third conductor (U) and including two series-connected coils (26, 26), two magnetic cores (27, 27') reciprocally movably mounted in said two coils (26, 26') respectively and being mechanically connected to said armature (A) and electrically connected to said two saturant reactors (Rv, Rw) respectively, whereby depending on the positions of said two magnetic cores (27, 27) in said two coils (26, 26') respectively said two satur
  • a pumping system as set forth in claim 1, characterized by the fact that, for breaking the current, when the moving direction is reversed, static means for switching are used, e.g. saturant reactors, controlled by the motion of the mobile armature, so that between the moment of the break-off of the current and the moment of its re-establishing in the reversed stroke a displacement must exist during which the deceleration and the acceleration in opposite direction of the mobile garniture is achieved by hydraulic drive, so that the current will be re-established only after the normal speed has been reached.
  • static means for switching are used, e.g. saturant reactors, controlled by the motion of the mobile armature, so that between the moment of the break-off of the current and the moment of its re-establishing in the reversed stroke a displacement must exist during which the deceleration and the acceleration in opposite direction of the mobile garniture is achieved by hydraulic drive, so that the current will be re-established only after the normal speed has been reached.
  • M electric motor
  • Rv and Rw saturant reactors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Hydraulic Motors (AREA)
US440455A 1964-03-21 1965-03-17 Pumping device for deep oil wells Expired - Lifetime US3364864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RO4769564 1964-03-21

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US3364864A true US3364864A (en) 1968-01-23

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US (1) US3364864A (de)
AT (1) AT261406B (de)
BE (1) BE661376A (de)
DE (1) DE1298884B (de)
GB (1) GB1070344A (de)
NL (1) NL6503620A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083905A (en) * 1988-03-08 1992-01-28 Framo Developments (Uk) Limited Linear motor powered pump unit
WO1993006369A1 (en) * 1991-05-29 1993-04-01 Uniflo Oilcorp, Ltd. Linear electric motor and method of using and constructing same
US5314025A (en) * 1992-11-12 1994-05-24 Fluid Master, Inc. Fluid pumping apparatus and method of pumping fluid
WO2015156931A1 (en) * 2014-03-31 2015-10-15 General Electric Company Pumping system for a wellbore and methods of assembling the same
RU2578746C1 (ru) * 2015-02-25 2016-03-27 Общество с ограниченной ответственностью "Энергетический шар" Насосная установка
US9429001B2 (en) 2012-09-10 2016-08-30 Flotek Hydralift, Inc. Synchronized pump down control for a dual well unit with regenerative assist
CN113062705A (zh) * 2021-03-30 2021-07-02 沈阳新城石油机械制造有限公司 一种潜油电动柱塞泵深抽井对接电机举升结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2145142C1 (ru) * 1998-01-30 2000-01-27 Открытое акционерное общество Нефтяная компания "Лукойл" Электродвигатель погружного насоса
CN103671002B (zh) * 2013-12-31 2017-01-25 德州宇力液压有限公司 一种钻井液压泵
CN109386023B (zh) * 2017-08-14 2024-05-28 三禾电器(福建)有限公司 一种多井泵联动式深井供水方法及系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1287078A (en) * 1913-04-28 1918-12-10 Robert E Newcomb Electrically-operated device to produce fluid motion.
US1655825A (en) * 1924-12-09 1928-01-10 King C Gillette Electrically-operated oil-well pump
US1740003A (en) * 1926-05-24 1929-12-17 Kobe Inc Electrically-driven oil-well pump
US1840994A (en) * 1930-01-20 1932-01-12 Irwin B Winsor Electromagnetic pump
US3031970A (en) * 1960-11-15 1962-05-01 Hoblitzelle Karl St John Magnetic ram pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1287078A (en) * 1913-04-28 1918-12-10 Robert E Newcomb Electrically-operated device to produce fluid motion.
US1655825A (en) * 1924-12-09 1928-01-10 King C Gillette Electrically-operated oil-well pump
US1740003A (en) * 1926-05-24 1929-12-17 Kobe Inc Electrically-driven oil-well pump
US1840994A (en) * 1930-01-20 1932-01-12 Irwin B Winsor Electromagnetic pump
US3031970A (en) * 1960-11-15 1962-05-01 Hoblitzelle Karl St John Magnetic ram pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083905A (en) * 1988-03-08 1992-01-28 Framo Developments (Uk) Limited Linear motor powered pump unit
US5252043A (en) * 1990-01-10 1993-10-12 Uniflo Oilcorp Ltd. Linear motor-pump assembly and method of using same
WO1993006369A1 (en) * 1991-05-29 1993-04-01 Uniflo Oilcorp, Ltd. Linear electric motor and method of using and constructing same
US5314025A (en) * 1992-11-12 1994-05-24 Fluid Master, Inc. Fluid pumping apparatus and method of pumping fluid
US9429001B2 (en) 2012-09-10 2016-08-30 Flotek Hydralift, Inc. Synchronized pump down control for a dual well unit with regenerative assist
WO2015156931A1 (en) * 2014-03-31 2015-10-15 General Electric Company Pumping system for a wellbore and methods of assembling the same
RU2578746C1 (ru) * 2015-02-25 2016-03-27 Общество с ограниченной ответственностью "Энергетический шар" Насосная установка
CN113062705A (zh) * 2021-03-30 2021-07-02 沈阳新城石油机械制造有限公司 一种潜油电动柱塞泵深抽井对接电机举升结构

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Publication number Publication date
NL6503620A (de) 1965-09-22
GB1070344A (en) 1967-06-01
BE661376A (de) 1965-07-16
AT261406B (de) 1968-04-25
DE1298884B (de) 1969-07-03

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