EP0310254A2 - Unité de pompe volumétrique alternative - Google Patents

Unité de pompe volumétrique alternative Download PDF

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Publication number
EP0310254A2
EP0310254A2 EP88308194A EP88308194A EP0310254A2 EP 0310254 A2 EP0310254 A2 EP 0310254A2 EP 88308194 A EP88308194 A EP 88308194A EP 88308194 A EP88308194 A EP 88308194A EP 0310254 A2 EP0310254 A2 EP 0310254A2
Authority
EP
European Patent Office
Prior art keywords
piston
pump
space
pump unit
cylinder
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.)
Withdrawn
Application number
EP88308194A
Other languages
German (de)
English (en)
Other versions
EP0310254A3 (fr
Inventor
Frank Mohn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Framo Developments UK Ltd
Original Assignee
Framo Developments UK Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Framo Developments UK Ltd filed Critical Framo Developments UK Ltd
Publication of EP0310254A2 publication Critical patent/EP0310254A2/fr
Publication of EP0310254A3 publication Critical patent/EP0310254A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F04B3/00—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125—Reciprocating valves
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125—Reciprocating valves
    • F04B53/126—Ball valves

Definitions

  • the invention relates to a pump unit of the kind in which a pumping action is effected by reciprocating movement of a piston or pump element.
  • Positive displacement pumps of this kind offer many advantages, for example simplicity and reliable operation, particularly for relatively small pumping capacities, but they have the disadvantage that the movement of the fluid being pumped is not continuous. A pulsating flow results from the successive repeated pumping strokes of the pump element.
  • the present invention accordingly provides a pump unit having an inlet or suction space, a pump space, a discharge space, and piston means reciprocably driven so as to move a fluid to be pumped into the discharge space during both a first stroke, in which the fluid is expelled from the pump space, and a return stroke in which the fluid is moved from the inlet space into the pump space.
  • Pump units of the invention can be readily arranged to move substantially equal amounts of the fluid into the discharge space during each stroke, so as to achieve an even pumped discharge and the piston means are conveniently driven by linear electric motors which can be arranged to be substantially equally loaded during each stroke.
  • the invention can thus provide a pump unit having two reciprocating piston elements located in series in the pumping direction, the piston elements being associated with non-return valves and being reciprocated in opposed phase, so as to be effective alternately.
  • the piston elements can conveniently have one or more passages therethrough fitted with appropriately orientated non-return valves.
  • upstream and downstream piston elements are cyclically moved towards and away from each other.
  • the downstream element expels the fluid being pumped to the outlet or discharge and draws fluid in through the non-return valve of the upstream element, which has no pumping function until the piston elements reverse direction and move towards each other. It is then the upstream piston element which functions to draw in fluid to the inlet space and to expel it through the downstream non-­return valve.
  • the invention can thus also provide a pump unit comprising a cylinder having a piston movable to draw a fluid to be pumped into the cylinder from an inlet and to discharge the fluid therefrom into a discharge space by way of a hollow piston rod extending from the piston outwardly of the cylinder into the discharge space.
  • a pump unit comprising a cylinder having a piston movable to draw a fluid to be pumped into the cylinder from an inlet and to discharge the fluid therefrom into a discharge space by way of a hollow piston rod extending from the piston outwardly of the cylinder into the discharge space.
  • the piston means is conveniently driven electrically, as by a linear electric motor, the operation of which can be either synchronous or asynchronous.
  • a linear electric motor the operation of which can be either synchronous or asynchronous.
  • the piston means comprises two piston elements, there can move within a common pump casing, and for each pump element, a winding in the casing wall constitutes the stator of the linear motor and the piston itself constitutes the so-called rotor.
  • the two motors are powered so that the phase sequence provides fields travelling in opposite directions.
  • the piston means comprises a single piston and piston rod assembly, this can carry a surrounding sleeve constituting the rotor which is itself surrounded by a stator winding.
  • the pump unit 1 illustrated in Figure 1 is intended as an oil lift pump, and is shown as being carried at the lower end of the tubular pipe stack 2 within a drill hole 4.
  • the pump unit 1 comprises a pump casing comprising concentric cylindrical inner and outer shells 5 and 6, of which the interior of the inner shell defines a pumping chamber.
  • the lower end of the chamber communicates with the oil to be pumped, and the upper end communicates with the interior of the pipe stack 2 which serves as an oil delivery pipe.
  • each piston 10,11 is closed by a non-return valve 16. Both non-return valves 16 are arranged so as to permit oil flow upwardly and to prevent oil flow in the downward direction. Oil can thus flow upwardly through the piston 11 into a pump chamber or region between the pistons, and through the piston 10 into a discharge chamber or region above it and communicating with the pipe stack interior.
  • stator windings 20,21 Between the inner and outer pump housing shells, there are accommodated upper and lower stator windings 20,21.
  • the upper stator winding 20 surrounds the upper piston 10 and forms with it a linear electric motor, of which the piston constitutes the so-called "rotor" or driven portion.
  • the lower stator winding 21 surrounds the lower piston 11 to constitute a second, independently controllable, linear electric motor, with the lower piston as its rotor.
  • each of the pistons 10,11 can each be provided with a rotor winding 24 adjacent its outer periphery.
  • the stator windings 20,21 each extend over about one half of the axial length of the pump casing interior, so each piston is capable of reciprocating movement axially of the casing between the axial centre and a respective end of the pump casing.
  • Three-phase, frequency controlled, electric power is carried to the stator windings 20,21 from control and supply circuitry 25 at the upper end of the pipe stack 2, by conductor means 27 extending along it.
  • conductor means 27 extending along it.
  • Such conductor means comprises three concentric tubular conductors with insulation between them.
  • the concentric conductor tubing can be received between outer pipe stack tubing and an interior liner containing the crude oil flow, with spacing to accommodate flow or circulation of protective or barrier fluid, which can extend through the pump casing between the inner and outer shells.
  • protective or barrier fluid Particulars of suitable concentric conductor and protective fluid flow arrangements appear from EP-A-0 063 444 which is incorporated herein by reference.
  • the two linear electric motors are operated so that the upper and lower pistons 10,11 move in opposite directions.
  • the linear electric motors are energised so that the lower piston 11 is raised and the upper piston 10 lowered, until the pistons come into adjacency at the axial centre of the pump casing.
  • the non-return valve 16 of the lower piston 11 will be closed by the pressure of the oil between the pistons, but the upper non-return valve will open.
  • the lower piston 11 is thus operating to draw in fresh oil from below and at the same time to expel oil upwardly through the upper piston 10, which is at this time passive or inoperative, into the discharge region above it and thus into the pipe stack 2.
  • the pump units illustrated in Figures 2 and 3 each incorporate a single linear electric motor which can be constructed, and operated by appropriate supply and control circuitry, similarly to the motors of the pump unit of Figure 1.
  • the pump unit of Figure 2 can be employed for oil extraction similarly to that of Figure 1. It comprises a circular cylindrical outer housing 51 closed at its lower end, which is submerged in use in the oil to be pumped, by an end wall 52. Somewhat above the end wall 52, the housing 51 internally supports an annular stator winding 54 of a linear electric motor, of which the driven portion comprises a concentric sleeve 55.
  • the sleeve 54 is guided for reciprocation in the housing 51 by a concentric hollow pump shaft 56 to which it is connected by a radial web 57 positioned midway along the sleeve.
  • the hollow pump shaft 56 carries a piston 60 slidably received within a cylinder comprising inner and outer walls 61 and 62 extending concentrically upwardly from the end wall 52.
  • An inlet or suction aperture 64 in the end wall 52 communicates an inlet region containing the oil to be pumped with a pump chamber 65 defined by the cylinder inner wall 61, the end wall, and the piston 60, by way of a non-return valve 66.
  • a second non-­return valve 67 in an aperture through the piston 60 communicates the pump chamber 65 with the interior of the hollow discharge tube or pump shaft 56.
  • An equalization chamber 70 is defined by the cylinder inner wall 61, the upper side of the piston 60, and an annular end wall 71, through which the pump shaft 56 is sealingly guided.
  • the chamber 70 communicates with the oil to be pumped by the space between the walls 61 and 62 and passages 72 in the end wall 52.
  • a discharge space 75 is defined by a discharge duct 76 which is concentrically fixed within the housing 51 and of which the lower end is closed by an annular wall 77.
  • the upper end of the pump shaft 56 projects into the discharge chamber 75 through the annular wall 77 in which the pump shaft is slidingly guided.
  • the unitary piston structure constituted by the sleeve 55, the web 57 and the hollow pump shaft 56 is moved upwardly, so that oil is drawn into the pump chamber 65 through the non-return valve 66. Oil within the equalization chamber 70 is discharged into the suction region at the lower end of the housing through the passages 72, and the upper end of the pump shaft protrudes further into the discharge chamber 75.
  • the pump unit of Figure 2 achieves an even flow of the pumped oil into the discharge chamber 75 in that the volume of the pump shaft received in the discharge chamber at the end of the upward stroke is at least approximately half the volume of the pump chamber 65.
  • the volume of oil flowing into the discharge chamber 75 on a downward stroke equals the volume of the pump chamber 65, as swept by the piston 60, minus the volume of the pump shaft that is withdrawn from the discharge chamber, that is half the pump chamber volume.
  • the pump shaft 56 On upward movement of the piston 60, the pump shaft 56 effectively displaces its volume of oil within the discharge chamber 75, so that the resultant change in the discharge chamber is half the pump chamber volume on each of the upward and downward strokes.
  • the drive motor is thus loaded in both directions.
  • Oil flow into and out of the pump chamber 65 is of course equalised by the displacement of the oil from and into the equalization chamber 70.
  • the pump unit of Figure 3 operates in a similar way to the unit of Figure 2 but has the pump inlet and outlet at the same end.
  • An inlet duct or pipe 81 extends from a body of the fluid to be pumped to a straight portion which provides a cylinder portion 82 and a housing portion 84 for a linear electric motor which drives a piston 85 in the cylinder portion.
  • a centrally apertured transverse wall 86 separates the cylinder portion 82 from the motor housing portion 84 and a reciprocating drive is applied to the piston 85 from the motor by a shaft 87 sealingly extending through the aperture of the wall.
  • the linear electric motor comprises an annular stator winding portion 90 mounted within the housing portion 84 and a co-­operating driven portion 91 surrounded by the stator winding and having the shaft 87 extending from it.
  • a pump space or chamber 94 is defined between the piston 85 and the wall 86, and this communicates with an inlet space 95 on the other side of the piston, by way of passages 96 through the piston each controlled by a non-return valve 97. Also on this side, the piston 85 carries a concentric discharge tube 99, the interior of which communicates with the pressure chamber 94 by passages 100 controlled by a return valve 101.
  • a pump discharge duct or pipe 102 is concentrically received, with adequate spacing, within the inlet pipe 81 and is closed by an annular end wall 104 through which the piston discharge tube 99 sealingly extends.
  • fluid in the pressure chamber 94 is expelled by way of the passages 100, the non-return valve 101 and the discharge tube 99 into a discharge space 105 constituted by the discharge pipe 102.
  • fluid in the inlet space 95 enters the pump chamber 94 by way of the passages 96 and the check valves 97, and the discharge tube 99 carries fluid into the discharge space 105 by its leftward movement, as shown.
  • the dimensions of the pump unit components are preferably chosen so that equal volumes of the fluid enter the discharge space 105 on each stroke of the piston 85.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Reciprocating Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
EP88308194A 1987-09-07 1988-09-05 Unité de pompe volumétrique alternative Withdrawn EP0310254A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8720995 1987-09-07
GB878720995A GB8720995D0 (en) 1987-09-07 1987-09-07 Reciprocating pump unit

Publications (2)

Publication Number Publication Date
EP0310254A2 true EP0310254A2 (fr) 1989-04-05
EP0310254A3 EP0310254A3 (fr) 1990-05-30

Family

ID=10623391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88308194A Withdrawn EP0310254A3 (fr) 1987-09-07 1988-09-05 Unité de pompe volumétrique alternative

Country Status (2)

Country Link
EP (1) EP0310254A3 (fr)
GB (1) GB8720995D0 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132930A1 (de) * 1991-10-04 1993-04-08 Teves Gmbh Alfred Pumpe
DE29518782U1 (de) * 1995-11-27 1997-03-27 Speck-Pumpen Walter Speck KG, 91154 Roth Elektromagnetische Kolbenpumpe
US5676651A (en) 1992-08-06 1997-10-14 Electric Boat Corporation Surgically implantable pump arrangement and method for pumping body fluids
WO2001075304A1 (fr) * 2000-04-04 2001-10-11 Baker Hughes Incorporated Pompe a injection chimique sous-marine
DE102005035835A1 (de) * 2005-07-30 2007-02-08 Ksb Aktiengesellschaft Schwingankerpumpe mit elektromagnetischem Antrieb
EP2383432A1 (fr) * 2010-04-29 2011-11-02 Welltec A/S Système de pompage
WO2012089246A1 (fr) * 2010-12-28 2012-07-05 Dresser Wayne Ab Pompe de récupération des vapeurs
GB2505961A (en) * 2012-09-18 2014-03-19 Statoil Petroleum As Pump for lifting fluid from a wellbore

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106678086A (zh) * 2015-11-09 2017-05-17 吴新保 往复泵的双塞串联应用方法,以及应用该方法的高效液体泵

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2437666A1 (de) * 1974-08-05 1976-02-19 Earl William Wolford Magnetpumpe
DE3132897A1 (de) * 1981-08-20 1983-03-03 Robert Bosch Gmbh, 7000 Stuttgart Foerderpumpe
GB2112872A (en) * 1981-12-10 1983-07-27 British Petroleum Co Plc Pumping apparatus for installation in wells
US4538970A (en) * 1983-10-17 1985-09-03 Rabson Thomas A Downstroke lift pump for wells
US4548552A (en) * 1984-02-17 1985-10-22 Holm Daniel R Dual valve well pump installation
GB8600746D0 (en) * 1986-01-14 1986-02-19 Framo Dev Ltd Electrically powered pump unit

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132930A1 (de) * 1991-10-04 1993-04-08 Teves Gmbh Alfred Pumpe
US5676651A (en) 1992-08-06 1997-10-14 Electric Boat Corporation Surgically implantable pump arrangement and method for pumping body fluids
US5676162A (en) 1992-08-06 1997-10-14 Electric Boat Corporation Reciprocating pump and linear motor arrangement
US5693091A (en) 1992-08-06 1997-12-02 Electric Boat Corporation Artificial heart and method of maintaining blood flow
US5702430A (en) 1992-08-06 1997-12-30 Electric Boat Corporation Surgically implantable power supply
US5722429A (en) 1992-08-06 1998-03-03 Electric Boat Corporation Connecting arrangement for medical device
US5758666A (en) 1992-08-06 1998-06-02 Electric Boat Corporation Reciprocating pump with imperforate piston
US5843129A (en) 1992-08-06 1998-12-01 Electric Boat Corporation Electrical circuit for equipment requiring redundant flow paths and method of use
US5879375A (en) 1992-08-06 1999-03-09 Electric Boat Corporation Implantable device monitoring arrangement and method
DE29518782U1 (de) * 1995-11-27 1997-03-27 Speck-Pumpen Walter Speck KG, 91154 Roth Elektromagnetische Kolbenpumpe
WO2001075304A1 (fr) * 2000-04-04 2001-10-11 Baker Hughes Incorporated Pompe a injection chimique sous-marine
US6663361B2 (en) 2000-04-04 2003-12-16 Baker Hughes Incorporated Subsea chemical injection pump
DE102005035835A1 (de) * 2005-07-30 2007-02-08 Ksb Aktiengesellschaft Schwingankerpumpe mit elektromagnetischem Antrieb
EP2383432A1 (fr) * 2010-04-29 2011-11-02 Welltec A/S Système de pompage
CN102859115A (zh) * 2010-04-29 2013-01-02 韦尔泰克有限公司 泵送系统
US9045976B2 (en) 2010-04-29 2015-06-02 Welltec A/S Pumping system
CN102859115B (zh) * 2010-04-29 2016-06-08 韦尔泰克有限公司 泵送系统
WO2012089246A1 (fr) * 2010-12-28 2012-07-05 Dresser Wayne Ab Pompe de récupération des vapeurs
CN103298731A (zh) * 2010-12-28 2013-09-11 德莱赛稳公司 蒸汽回收泵
CN103298731B (zh) * 2010-12-28 2015-10-07 韦恩加油系统瑞典公司 蒸汽回收泵
GB2505961A (en) * 2012-09-18 2014-03-19 Statoil Petroleum As Pump for lifting fluid from a wellbore
WO2014044334A3 (fr) * 2012-09-18 2014-09-18 Statoil Petroleum As Pompe améliorée permettant de transporter un fluide depuis un trou de forage

Also Published As

Publication number Publication date
GB8720995D0 (en) 1987-10-14
EP0310254A3 (fr) 1990-05-30

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