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| Number | Title | Issue Date |
| 7337854 | Gas-pressurized lubricator and method Embodiments of the present invention provide methods and apparatus for reducing kinetic energy of a plunger within a plunger lift system. In one aspect, a lubricator is provided at a surface of a wellbore, the lubricator having a sealed, pressurized chamber therein ... | 03/04/2008 |
| 7328748 | Thermal actuated plunger A downhole plunger for a gas/oil well comprises a valve to regulate fluid flow past the plunger and a thermal actuator to control the valve. The thermal actuator of the disclosed device enables the valve to open and close aperatures without relying on the physical i... | 02/12/2008 |
| 7314080 | Slidable sleeve plunger An improved plunger lift mechanism comprises an internal hollow body having bypass orifices that, when exposed, allow fluid to pass through during plunger descent in a downhole tube to the bottom of a production well. A slidable sleeve slides along the hollow body t... | 01/01/2008 |
| 7290602 | Internal shock absorber bypass plunger A bypass plunger having one or more internal shock absorbing elements and a variety of bypass orifice options is disclosed. ... | 11/06/2007 |
| 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 |
| 7273098 | Method for controlling oil and gas well production from multiple wells A method for producing oil or gas from multiple wells, the wells including at least a first well and a second well, with each well using an artificial lift system that includes a plunger associated with a motor valve off time, and first and second identical connecti... | 09/25/2007 |
| 7191838 | Method and apparatus for pumping wells with a sealing fluid displacement device Liquid is lifted from a well by a fluid displacement device which moves within a production tubing and maintains a seal against the production tubing during movement. The fluid displacement device is moved up and down within the production tubing between the well bo... | 03/20/2007 |
| 7188670 | Plunger lift system An intermittent lift plunger includes at least one seal mandrel, a bottom sub and an upper valve assembly. The valve assembly is closed by a well bottom stop which inserts into the lift plunger and opened by a lubricator stop at the top of the well. The seal mandrel... | 03/13/2007 |
| 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 |
| 7125012 | Rotatable feed wheel for sheet converting machine A feed wheel includes a hub and a discontinuous tread removably fitted about the hub. At leading and trailing ends of the discontinuous tread are mateable non-planar female and male surfaces which interfit with one another and tend to interlock the tread ends togeth... | 10/24/2006 |
| 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 |
| 7117947 | Well chemical treatment utilizing plunger lift delivery system An apparatus and method for delivery of treatment chemicals to the bottom of the wellbore. The delivery system can be a chemical dispenser which can be attached to a plunger used in plunger lift operations, a plunger which has been impregnated with treatment chemica... | 10/10/2006 |
| 7080690 | Method and apparatus using traction seal fluid displacement device for pumping wells Liquid is lifted from a well by a traction seal fluid displacement device which is moveably positioned within the production tubing, and which maintains a seal during movement. The traction seal device comprises a resilient flexible toroid shaped structure within ou... | 07/25/2006 |
| 7040401 | Automated plunger catcher and releaser and chemical launcher for a well tubing method and apparatus An automated plunger catcher and releaser and chemical launcher for a well tubing method and apparatus. In one configuration, arrival of a plunger is sensed as the plunger ascends from the wellbore through the production tubing and a signal is sent to a controller. ... | 05/09/2006 |
| 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 |
| 7004258 | Method and apparatus for enhancing oil and gas flow in a well An apparatus for increasing oil and gas recovery includes a delivery mechanism for automatically introducing a flow enhancing substance into a plunger of an oil or gas well and method. ... | 02/28/2006 |
| 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 |
| 6907926 | Open well plunger-actuated gas lift valve and method of use A system is provided for unloading accumulated liquids and enhancing the recovery of gas from a reservoir having diminished pressure. An annulus between a tubing string and casing is isolated by a packer and continually pressurized with a slipstream of compressed ga... | 06/21/2005 |
| 6746213 | Pad plunger assembly with concave pad subassembly A pad plunger assembly, for use in gas well tubing, includes an elongated mandrel having opposite ends and a longitudinal axis extending between the opposite ends, a pair of opposite end members each attached to one of the opposite ends of the mandrel, and a seal-fo... | 06/08/2004 |
| 6669449 | Pad plunger assembly with one-piece locking end members A pad plunger assembly includes a central mandrel having externally-threaded opposite ends, collars defined about the mandrel inwardly adjacent to the opposite ends and having circumferentially spaced recesses formed in the collars, end members having inn... | 12/30/2003 |
| 6637510 | Wellbore mechanism for liquid and gas discharge A wellbore pump comprises a plunger having a passage 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 spring to close the val... | 10/28/2003 |
| 6554580 | Plunger for well casings and other tubulars A plunger for well casings and other tubulars comprising: An elongate body having a flow passage with a lower inlet port and an upper outlet port; an internal valve positioned between the ports; at least one first flexible sealing member positioned around... | 04/29/2003 |
| 6200103 | Gas lift plunger having grooves with increased lift A plunger in a plunger lift system in an oil and gas well includes circumferential recessed surfaces that define grooves spaced along the plunger body. A curved convex surface or radius is formed between the lower extent of each recessed surface and the p... | 03/13/2001 |
| 6183225 | Angled flow ports for reciprocating piston pump A reciprocating piston pump is provided with angled flow ports to provide enhanced flow and reduced wear characteristics.... | 02/06/2001 |
| 6170573 | Freely moving oil field assembly for data gathering and or producing an oil well An oil field assembly for gathering data about or producing an oil well having a self regulating assembly for free movement by gravity or the differential pressure of fluids in the tubing string of a well from the surface of a well or to predetermined dow... | 01/09/2001 |
| 6148923 | Auto-cycling plunger and method for auto-cycling plunger lift An auto-cycling plunger and method for lifting out condensate and fluid that accumulate and retard production in oil and gas wells. The auto-cycling plunger comprises a tube that defines an inner chamber, one or more flapper sealing rings mounted on the t... | 11/21/2000 |
| 5915475 | Down hole well pumping apparatus and method A method and apparatus for pumping formation liquids provides a reciprocating down hole pump on the end of a coiled tubing string. In one embodiment, one fluid flow path is provided through the inside of the coiled tubing and another flow path is provided... | 06/29/1999 |
| 5868554 | Flexible plunger apparatus for free movement in gas-producing wells A flexible plunger apparatus includes an elongated flexible member having a pair of opposite end portions and a longitudinal length extending between the opposite end portions, with the flexible member being adapted to flex in transverse relationship to i... | 02/09/1999 |
| 5785500 | Well pump having a plunger in contact with well and pump fluid A pump apparatus for use in a pump system of a well capable of exerting and releasing pressure on a pump fluid supplied to the pump apparatus. The pump apparatus includes a tubular body having a pump fluid space for communicating with the pump fluid and a... | 07/28/1998 |
| 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 |
| 4889473 | Production plunger A production plunger is disclosed that will automatically reciprocate in the production string of a producing oil well that is also producing some gas. The plunger includes a body having a passageway that allows fluid to bypass the packer cups carried by ... | 12/26/1989 |
| 4813485 | Gas and oil well pumping or swabbing device and method The pumping or swabbing device and apparatus of the invention utilizes an elongate barrel slidable upwardly and downwardly on an axial rod which carries a valve element for closing on a valve seat provided interiorly of the barrel to close passage through... | 03/21/1989 |
| 4712981 | Pressure-operated valving for oil and gas well swabs Apparatus and method of utilizing differential pressure to seat an almost-closed valve ball. Included are apparatus and means to protect valve ball from excessive closing force. Also included is a multiple valve arrangement to relieve excessive differenti... | 12/15/1987 |
| 4696624 | Casing pump A well-pressure operated pump having a tubular pump body provided with an interior, annular seating surface to receive a valve member mounted on a rod extending through the seating surface. An air spring in the pump body urges the rod upwardly in response... | 09/29/1987 |
| 4664602 | Controller for plunger lift system for oil and gas wells A controller is disclosed for a plunger lift system for oil and gas wells that monitors the casing pressure, flow line pressure, and battery voltage and overrides the on-time and off-time periods to either shut the well in or open the flow line valve when... | 05/12/1987 |
| 4629004 | Plunger lift for controlling oil and gas production A plunger lift is adapted to be disposed in a well tubing string for slidable movement in relation to the tubing string in response to lift pressure. The plunger lift is an integral, one-piece unit that comprises a generally cylindrical, elongated shaft h... | 12/16/1986 |
| 4526513 | Method and apparatus for control of pipeline compressors After the pumping station set points for a desired pipeline operation are calculated, they are used by process controllers at the individual pumping stations to control operations at the station. Measured values of the station's performance are compared w... | 07/02/1985 |
| 4502843 | Valveless free plunger and system for well pumping A rugged lightweight valveless plunger (38) is provided for use in a well pumping system of the free plunger type. The plunger (38) comprises an elongated cylindrical integral aluminum body (42) having a rigid sealing section (44) formed by a plurality of... | 03/05/1985 |
| 4465435 | Apparatus for using natural gas pressure for pumping a well An apparatus for periodically raising a quantity of liquid from a well to the earth's surface comprises a piston assembly above which the liquid collects in a tubing in which the piston assembly slides, the piston assembly including a piston member having... | 08/14/1984 |
| 4425083 | Velocity actuated valve for a downhole pump A downhole pump for a well is disclosed which includes a piston slidably disposed within a housing for pumping fluid from the well. The longitudinal axes of the piston and the housing extend in a generally vertical direction with respect to the surface of... | 01/10/1984 |
