公开(公告)号：EP2035702A2

公开(公告)日：2009-03-18

申请号：EP07798436.7

申请日：2007-06-12

申请人： Unico, Inc.

发明人： BECK, Thomas L. ,  ANDERSON, Robb G. ,  PETERSON, Ronald G. ,  MACDONALD, Michael A.

IPC分类号： F04B17/00 ,  E21B19/18 ,  F04B35/04

CPC分类号： F04B47/04 ,  F04B47/022

摘要： An apparatus and method for pumping fluids, such as water and/or hydrocarbons, from a subterranean formation or reservoir, include a linear rod pump having a mechanical rack and pinion drive arrangement, adapted for attachment to a pumping mechanism, such as the polished rod at the top of a rod string in a hydrocarbon well. The rack gear, of the rack and pinion drive arrangement, is adapted for connection to, and movement with, the polished rod. The pinion gear does not translate with the rack gear, and is driven by a reversible motor for affecting up and down reciprocating motion of the rack gear and pumping mechanism. Some forms of the invention include a compressible gas counter-balance arrangement. Some forms of the invention include an electronic drive configured for dealing with electric power generated by the motor during a portion of the pumping cycle.

公开(公告)号：EP1937461A2

公开(公告)日：2008-07-02

申请号：EP06804113.6

申请日：2006-09-26

申请人： Unico, Inc.

发明人： ANDERSON, Robb G. ,  MCCRICKARD, James P. ,  BECK, Thomas L.

IPC分类号： B30B15/28 ,  F15B15/20

CPC分类号： B30B1/38 ,  B30B1/18 ,  Y10T74/1868

摘要： An improved method and apparatus (100) are provided for constructing and operating a linear actuator (108), and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement (116) between the driving member (112) and the driven member (144) of a mechanical linear actuator for applying a unidirectional biasing force between the driving and driven members, along an axis of motion, regardless of the location or movement of the driving and driven elements with respect to one another along the axis of motion. The pneumatic biasing arrangement (116) is also configured, connected and operated to reduce the force which must be exerted by the driving (112) and driven (114) members in extending and retracting the linear actuator (108). The pneumatic biasing arrangement may further be configured for preferentially aiding extension or retraction of the actuator.

公开(公告)号：EP2035702B1

公开(公告)日：2018-08-22

申请号：EP07798436.7

申请日：2007-06-12

申请人： Unico, Inc.

发明人： BECK, Thomas L. ,  ANDERSON, Robb G. ,  PETERSON, Ronald G. ,  MACDONALD, Michael A.

IPC分类号： F04B47/02 ,  F04B47/04 ,  F04B17/03

CPC分类号： F04B47/04 ,  F04B47/022

摘要： An apparatus and method for pumping fluids, such as water and/or hydrocarbons, from a subterranean formation or reservoir, include a linear rod pump having a mechanical rack and pinion drive arrangement, adapted for attachment to a pumping mechanism, such as the polished rod at the top of a rod string in a hydrocarbon well. The rack gear, of the rack and pinion drive arrangement, is adapted for connection to, and movement with, the polished rod. The pinion gear does not translate with the rack gear, and is driven by a reversible motor for affecting up and down reciprocating motion of the rack gear and pumping mechanism. Some forms of the invention include a compressible gas counter-balance arrangement. Some forms of the invention include an electronic drive configured for dealing with electric power generated by the motor during a portion of the pumping cycle.

公开(公告)号：EP1937461B1

公开(公告)日：2012-11-07

申请号：EP06804113.6

申请日：2006-09-26

申请人： Unico, Inc.

发明人： ANDERSON, Robb G. ,  MCCRICKARD, James P. ,  BECK, Thomas L.

IPC分类号： B30B15/28 ,  F15B15/20

CPC分类号： B30B1/38 ,  B30B1/18 ,  Y10T74/1868

摘要： An improved method and apparatus (100) are provided for constructing and operating a linear actuator (108), and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement (116) between the driving member (112) and the driven member (144) of a mechanical linear actuator for applying a unidirectional biasing force between the driving and driven members, along an axis of motion, regardless of the location or movement of the driving and driven elements with respect to one another along the axis of motion. The pneumatic biasing arrangement (116) is also configured, connected and operated to reduce the force which must be exerted by the driving (112) and driven (114) members in extending and retracting the linear actuator (108). The pneumatic biasing arrangement may further be configured for preferentially aiding extension or retraction of the actuator.

公开(公告)号：EP2156007A1

公开(公告)日：2010-02-24

申请号：EP08746405.3

申请日：2008-04-21

申请人： Unico, Inc.

发明人： ANDERSON, Robb G. ,  BECK, Thomas L.

IPC分类号： E21B21/08

CPC分类号： G01F1/80 ,  E21B47/042 ,  F04D13/10 ,  F04D15/0066 ,  F04D15/0088 ,  G01F1/78 ,  G01F23/00 ,  G01F23/22 ,  G05B17/02 ,  G05D9/12

摘要： A method and apparatus for determining a fluid level and/or output flow during operation of a centrifugal pump, are provided, which may be used for production of gas and/or oil from a well, and include a vector feedback model to derive values of torque and speed from signals indicative of instantaneous current and voltage drawn by the pump motor, a pump model which derives values of the fluid flow rate and the head pressure for the pump from torque and speed inputs, a pumping system model that derives, from the estimated values of the pump operating parameters, an estimated value of fluid level and other pumping system parameters. Controllers responsive to the estimated values of the pumping system parameters control the pump to maintain fluid level at the pump input, near an optimum level, or within a safe operating range and/or output flow from the pump.