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| Number | Title | Issue Date |
| 7377312 | Oil well pump apparatus An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime ... | 05/27/2008 |
| 7275592 | Oil well pump apparatus An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime ... | 10/02/2007 |
| 7134503 | Wellbore pump The wellbore pump of the present invention comprises a plunger having passage means which may be open or closed by a valve operated by a piston which is biased in the open position by a spring of selected strength such that the wellbore pressure may overcome the spr... | 11/14/2006 |
| 7121335 | Plunger for gas wells A plunger for a gas well including an elongate body having a first end and a second end. A sleeve overlying the body. The sleeve being shorter in length than the elongate body and is axially moveable between the first end and the second end of the body. At least one... | 10/17/2006 |
| 7080691 | Plunger lift tool and method of using the same A plunger lift tool and method of using the same in a well having tubing comprising a tubular housing, having a top portion, a bottom portion, and said housing further defines a passageway therein; a positioning means attached to said housing for removably installin... | 07/25/2006 |
| 7080692 | Plunger lift tool and method of using the same A plunger lift tool and method of using the same in a well having tubing comprising a tubular housing, having a top portion, a bottom portion, and said housing further defines a passageway therein; a positioning means attached to said housing for removably installin... | 07/25/2006 |
| 7021387 | Wellbore pump The wellbore pump of the present invention comprises a plunger having passage means which may be open or closed by a valve operated by a piston which is biased in the open position by a spring of selected strength such that the wellbore pressure may overcome the spr... | 04/04/2006 |
| 6971856 | Plunger for well casings and other tubulars A plunger for well casings and tubulars comprising: an upper valve rod segment slideably positioned within the plunger body; a valve rod tube slideably positioned in the lower end of the plunger body; a lower valve rod segment slideably positioned in the valve rod t... | 12/06/2005 |
| 6935427 | Plunger conveyed plunger retrieving tool and method of use A wellbore plunger retrieving tool including a substantially cylindrical retrieving plunger body having a reduced diameter top end and an opposed bottom end. The body bottom end has a threaded recess. A plunger receiving collet includes a threaded male top end engag... | 08/30/2005 |
| 6851480 | Gas operated automatic, liquid pumping system for wells An improved, unattended, liquid pumping device for oil and gas wells featuring a bellows controlled flow valve that opens and closes at preset pressures. Additionally a well head receiver design that releases shut in production gas below the pumping device and provi... | 02/08/2005 |
| 5462115 | Gas and oil well swab A swab is movably mounted within a well casing and automatically removes fluid from the well upon accumulated pressure at the bottom of the casing reaching a predetermined amount to raise the swab within the casing. The swab has a hollow body with an inne... | 10/31/1995 |
| 5427504 | Gas operated plunger for lifting well fluids A gas operated plunger for lifting well fluids from a subterranean reservoir to the surface through a well conduit comprising: a plunger body slidably mountable within the conduit having an upper portion, a lower portion and an intermediate cylindrical po... | 06/27/1995 |
| 5253713 | Gas and oil well interface tool and intelligent controller An interface tool freely slidable within a production pipe or conduit of an oil or gas well capable of creating a positive seal in order to lift liquids and particulates above the device to the surface where they are collected. An internal bypass valve pe... | 10/19/1993 |
| 5127803 | Pump tool An improved pump tool (10, 110, 200) is provided for lifting oil from within a casing 18 of a well. The gas in the well provides the lifting action. The pump tool includes a body (22) which is preferably formed of ABS plastic. The body defines an upper ch... | 07/07/1992 |
| 4986727 | Pressure-operated oil and gas well swabbing device An oil well swabbing device having a pressure activated valve for use in closing a fluid passage therein when the swabbing device is submerged under liquid in a well casing corresponding to a predetermined valve closing pressure; the pressure-activated va... | 01/22/1991 |
| 4984969 | Plunger lift tool A plunger tool is provided having a nose assembly to slow the descent of the tool into the well, a valve assembly, and a piston cylinder assembly. When the tool is dropped into the well, the gas and liquids in the well flow through restrictions in the nos... | 01/15/1991 |
| 4923372 | Gas lift type casing pump A gas operated, plunger lift type pump for use in a subterranean well conduit which extends from a pool of well liquids to the surface comprises a tubular plunger slidably and sealingly mounted in the well conduit and defining a fluid flow passage through... | 05/08/1990 |
| 4576197 | Pump suction vacuum lift vortex control The invention involves positioning the working end of a vertical pump below the surface elevation of the fluid, enclosing a space around the pump with a structure extending below the surface and having a submerged opening to the main reservoir, and drawin... | 03/18/1986 |
| 4239458 | Oil well unloading apparatus and process An internal bypass free piston provides for continuous flow of gas during upward and downward travel of the piston; the piston is structured to rotate during downward travel to equalize wear and the frictional force between wall and piston is utilized to ... | 12/16/1980 |
