Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2005-10-25
2005-10-25
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C166S321000, C251S336000
Reexamination Certificate
active
06957703
ABSTRACT:
A subsurface safety valve has a closure sleeve or rod mounted below the closure mechanism. Control signal pushes the sleeve up (uphole) or down (downhole), whichever is applicable, which causes the closure element to rotate (or slide, or otherwise translate) to its open position. A loss of control signal allows the closure spring to push the sleeve or rod downhole (or uphole, whichever is appropriate). This movement causes the closure element to be driven to its closed position against the seat.
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McMahon David
Shaw Brian
Trott Douglas
Bagnell David
Baker Hughes Incorporated
Rosenblatt Steve
Stephenson Daniel P
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