Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2011-08-23
2011-08-23
Bagnell, David J (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C137S513300, C138S045000, C251S212000
Reexamination Certificate
active
08002040
ABSTRACT:
A technique enables control over flow in a wellbore with a flow control system. The flow control system combines a flow reduction mechanism with a flow control device, such as a valve. The flow reduction mechanism comprises a closure member which can be selectively moved between an unactuated and actuated position, allowing relatively greater flow through the flow control device in the unactuated position. The flow reduction mechanism actuates prior to or in conjunction with the flow control device to reduce flow and thus reduce the loading forces that would otherwise act against the flow control mechanism upon closure of the flow control device.
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Biddick David James
Goughnour Paul Gordon
Johnston Russell Alan
May Dwayne
McCalvin David
Bagnell David J
Clark Brandon S.
Loikith Catherine
Schlumberger Technology Corporation
Warfford Rodney
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