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| Number | Title | Issue Date |
| 7363981 | Seal stack for sliding sleeve A method and apparatus for sealing a tool for use in a wellbore is provided. The seal is configured to be disposed in a tool comprising a ported sliding sleeve and a ported housing. The tool may be actuable between a closed and an open position. The seal is configur... | 04/29/2008 |
| 6811353 | Aquifer recharge valve and method An aquifer recharge valve assembly comprises a valve movable along the interior of a pipe section to open and close aquifer recharge openings through the pipe section. The position of the valve controls the extent to which the recharge openings are available for del... | 11/02/2004 |
| 6666270 | Reciprocating pump vent-dump valve and methods of use A reciprocating pump vent-dump and methods of use for utilization in the hydrocarbon industry. The device is preferably used with barrel pumps although it may be used with tubing pumps. The device is positioned at the bottom of the wellbore immediately ab... | 12/23/2003 |
| 6328112 | Valves for use in wells A valve assembly includes a seat having at least an opening and a first surface. A cover has a contact surface that is slideably and sealingly engaged to the first surface of the seat to form a seal when the contact surface completely covers the at least ... | 12/11/2001 |
| 6269874 | Electro-hydraulic surface controlled subsurface safety valve actuator An electro-hydraulic surface controlled subsurface safety valve is controllable entirely electrically. The actuator operates on an electrically actuated pressure pump and a supply of hydraulic fluid reservoired in the tool proximate to the safety valve. A... | 08/07/2001 |
| 5479988 | Mud check valves in drilling apparatus (wells) A check valve for connection with the top end of a drillstring as a mud saver comprises a tubular valve member (18) which is axially shiftable within a tubular body (10) through a sleeve seal (19) which is mounted in the body (10) and which cooperates wit... | 01/02/1996 |
| 4856756 | Well bottom release valve A valve assembly for draining water from a well pipe to facilitate the flushing of the pipe or to reduce its weight when removing the pipe from the well without separating the components of the pumping system which are all securely connected. The valve as... | 08/15/1989 |
| 4645007 | Tubing drain valve The present invention discloses a tubing drain valve suitable for use in a borehole and a method for operating the disclosed valve. This device is particularly useful in a production pipe string where it provides a convenient apparatus and method for drai... | 02/24/1987 |
