Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1994-04-11
1995-08-22
Britts, Ramon S.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166386, 166319, E21B 3410
Patent
active
054431247
ABSTRACT:
A stage valve with particular use in cementing a well bore annulus where the stage valve has pressure operated valve member for opening a flow passage in the stage valve and the valve member has differential pressure areas which maintain the valve member open while a fluid moves through the flow passage in one direction and which can be closed by fluid moving in an opposite direction. The flow passage has a choke to develop a pressure differential from the flow of fluid. Spring members can be used with the valve member to close the flow passage when the pressure differential of the fluid flow in one direction is insufficient to maintain the valve member in an open position.
REFERENCES:
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patent: 3876000 (1975-04-01), Nutter
patent: 4109725 (1978-08-01), Williamson et al.
patent: 4257484 (1981-03-01), Whitley et al.
patent: 4279306 (1981-07-01), Weitz
patent: 4967845 (1990-11-01), Shirk
patent: 5048611 (1991-09-01), Cochran
patent: 5156210 (1992-10-01), Roth
Brooks Robert T.
Dion Michael O.
Gurley Derrel G.
Harris Monty E.
Wood Edward T.
Britts Ramon S.
CTC International
Fidler Donald H.
Tsay Frank S.
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