Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2008-07-09
2010-06-22
Wright, Giovanna C (Department: 3672)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C166S072000, C166S073000, C166S321000, C166S334100
Reexamination Certificate
active
07740075
ABSTRACT:
An embodiment of a valve that is operable from one position to another position upon relief of an applied pressure includes a housing having a bore; a valve member disposed with the housing, wherein the valve member is actuated to one position in response to a certain applied pressure and actuates toward another position upon relief of the certain applied pressure; and a relief system relieving the pressure applied to the valve member when the applied pressure falls below a selected pressure level.
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Goughnour Paul G.
Johnston Russell A.
Clark Brandon S.
Schlumberger Technology Corporation
Warfford Rodney V.
Winstead Sechrest & Minick
Wright Giovanna C
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