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| Number | Title | Issue Date |
| 7438125 | Variable orifice bypass plunger A plunger mechanism comprises an adjustable bypass valve. Depending on well parameters, a user may desire to adjust the descent rate of a plunger in service. The present device allows the user to vary or adjust the bypass orifice to alter the flow of liquid through ... | 10/21/2008 |
| 7314081 | Pumping from two levels of a pool of production fluid, and one way valve therefore A method of pumping upper production fluid from an upper level of an underground pool of production fluid and pumping lower production fluid having a higher concentration of sand from a lower level during a single pump cycle comprises providing a dual action recipro... | 01/01/2008 |
| 7237613 | Underbalanced marine drilling riser A riser assembly for offshore drilling has an inner conduit suspended within an outer riser. A seal assembly seals an annular space between the inner conduit and the riser at the lower end of the inner conduit. The seal assembly has a pressure area that is independe... | 07/03/2007 |
| 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 |
| 6145590 | Device for removing sand from pump plungers A sand removal apparatus for use with an oil pumping apparatus in which a first sand remover is attached between a valve rod and a plunger of the oil pumping apparatus and a second sand remover is attached to a bottom of the plunger within the working bar... | 11/14/2000 |
| 6116341 | Water injection pressurizer The present invention relates to an apparatus and a method for multiplying the hydrostatic head of a column of liquid into a magnified injection pressure for injecting water produced in a gas well into a disposal zone, while concurrently producing the gas... | 09/12/2000 |
| 5899270 | Side intake valve assembly A side intake valve assembly for use in a subterranean well in conjunction with a second or lower valve assembly, and a hollow connecting body for connecting the side intake valve assembly and the second or lower valve assembly. The side intake valve asse... | 05/04/1999 |
| 5823265 | Well completion system with well control valve A system for selective production from, and stimulation of, subterranean production zones while improving productivity and enhancing control of the well. Portions of a production tubing string and an internal stimulation/shifter string are assembled and r... | 10/20/1998 |
| 5797452 | Double-acting, deep-well fluid extraction pump This invention provides the structure and operation of a double-acting, deep-well fluid extraction pump assembly which includes a power piston housed on top of a pumping piston along with a power control system. The pumping piston has a dynamic, reciproca... | 08/25/1998 |
| 4924940 | Downhole cleanout tool A downhole tool for removing sand from a well bore has an elongated tubular member with four sections. A one-way valve is located between the upper first and second sections. A second one-way valve is located between the third and fourth sections, while a... | 05/15/1990 |
| 4721156 | Well clean out apparatus A well clean out apparatus of the reciprocating pump, recirculating, type has two debris entrapment chambers below and one fluid chamber above the pump. The pump piston has a stack of flat washers to function as piston packing. The washers are axially and... | 01/26/1988 |
| 4291763 | Dispenser for oil well treating chemicals A dispenser for well treating chemicals for pumping oil wells, for attachment to the bottom end of the tubing string, comprises a long cylindrical container, closed at top and bottom, about the same diameter as the tubing and rigidly attachable to the bot... | 09/29/1981 |
