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| Number | Title | Issue Date |
| 7823637 | Delayed acting gravel pack fluid loss valve A fluid loss valve is disposed in a wash pipe in a gravel packing assembly. It is preferably held open initially and when in the process it is time for the valve to be able to go closed a pulling force is applied that creates relative movement to either close the va... | 11/02/2010 |
| 6866100 | Mechanically opened ball seat and expandable ball seat A method and apparatus for obstructing the passage of fluid within a fluid flow conduit and subsequently reconfiguring the tool to allow substantially full-bore passage therethrough. Pressure developed upstream of the obstruction can be utilized to operate pressure ... | 03/15/2005 |
| 6293346 | Method and apparatus for relieving pressure A pressure relief system includes a closed space having fluid trapped therein, a chamber defined in the closed space, and a pressure responsive member for controlling fluid flow from the closed space to the chamber. Fluid flows from the closed space to th... | 09/25/2001 |
| 6021095 | Method and apparatus for remote control of wellbore end devices A wellbore remote control system is disclosed which includes (1) a transmission apparatus for generating at least one acoustic transmission having a particular transmission frequency, (2) a reception apparatus which includes an electronic circuit (prefera... | 02/01/2000 |
| 5066029 | Annular sealing apparatus An improved seal for sealing across an annulus between an inner cylindrical sealing surface and an outer cylindrical sealing surface. The seal provides a body and a flange spaced therefrom with an annular flexible arch extending between the body and the f... | 11/19/1991 |
| 4854387 | Large bore retrievable well safety valve A retrievable well subsurface safety valve having a valve seat and an arculate valve closure member on the bottom of the housing for increasing fluid flow through the bore of the housing. A nose, separate from the housing, is adapted to be connected in th... | 08/08/1989 |
| 4850432 | Manual port closing tool for well cementing In a downhole staging apparatus for delivering fluidized cement sequentially into two levels of substrate which enclose a wellbore casing. Said apparatus comprises a primary cement discharge port, and one or more secondary or lateral cement discharge port... | 07/25/1989 |
| 4768591 | Steam quality apparatus A downhole steam sampler for collecting the liquid phase content of a steam flow, immediately prior to the latter being injected into a substrate surrounding a hole or well. A reservoir within the sampler separates and retains the liquid phase while permi... | 09/06/1988 |
