Hydraulic port collar

Wells – Processes – Operating valve – closure – or changeable restrictor in a well

Patent

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Details

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:
patent: 3853177 (1974-12-01), Mott
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

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