Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2005-10-19
2008-03-25
Gay, Jennifer H. (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C166S321000, C166S375000
Reexamination Certificate
active
07347270
ABSTRACT:
A subsurface safety valve for controlling a fluid flow through a well conduit includes a housing having a bore and disposed within an annulus defined by the space between the well conduit and the housing, a valve closure member movable between an open position and a closed position, and adapted to restrict the fluid flow through the bore when in the closed position, a flow tube moveably disposed within the housing and adapted to shift the valve closure member between its open and closed positions, a primary piston member in operative communication with the flow tube and a secondary piston member in operative communication with the flow tube.
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May Dwayne E.
McMillan Timothy J.
Edwards Dona C.
Galloway Bryan P.
Gay Jennifer H.
Schlumberger Technology Corporation
Stephenson Daniel P
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