Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2007-02-21
2010-11-30
Thompson, Kenneth (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
Reexamination Certificate
active
07841412
ABSTRACT:
A downhole valve features a flow port that can be selectively obstructed by a pressure actuated sleeve that is movable in a pin and slot mechanism to rotate while being cycled up and down by application and removal of pressure in a cyclical manner. When the sleeve is cycled to the port closed position, a flapper mounted near its upper end can fall on a seat on the sleeve to allow pressure to be applied to the flapper and sleeve, causing the sleeve to move to a position that will prevent fluid loss from the tubular string into the formation. The Closed flapper allows pressure cycles of the sleeve. A double closure against fluid loss can be affected.
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Jasser Rami J.
Morton Robert D.
Baker Hughes Incorporated
Rosenblatt Steve
Sayre James G
Thompson Kenneth
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