Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2011-04-19
2011-04-19
Bagnell, David J (Department: 3676)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C166S319000, C166S332100
Reexamination Certificate
active
07926573
ABSTRACT:
A circulation control valve includes an opening between the valve exterior and an interior passage, an internal closure device for permitting and preventing flow through the opening, a valve device initially preventing flow through the opening, and an internal chamber. The valve device opens upon application of a pressure differential between the passage and the exterior to thereby permit communication through the opening, and the closure device displaces upon a second pressure differential between the passage and the internal chamber to thereby prevent communication through the opening. Another valve includes first and second valve devices. Communication through the opening is permitted upon application of the first pressure differential to the first device, thereby unbalancing a first piston, and fluid communication through the opening is prevented upon application of the second pressure differential to the second device, thereby unbalancing a second piston having a greater piston area than the first piston.
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Swan Tom
Williamson, Jr. Jimmie R.
Bagnell David J
Halliburton Energy Service,s Inc.
Michener Blake
Smith Marlin R.
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