Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2005-02-15
2005-02-15
Bagnell, David (Department: 3672)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C166S386000, C166S334100, C166S332800
Reexamination Certificate
active
06854519
ABSTRACT:
A valve for use in a wellbore, the valve having a compensating secondary sealing system for misalignments that inevitably occur in sealing subsurface valves, particularly subsurface safety valves. A sealing system can include a dynamic sealing system and a static sealing system, where the static sealing system establishes one or more line contact surfaces. The line contact surfaces can be leading, in that the forward edge of the seal faces a corresponding engagement portion of the actuator. The actuator can include at least two spherical engagement portions where one of the spherical engagement portions engages resilient and non-resilient seals with line contact surfaces on a downstroke and the other spherical engagement portion engages resilient and non-resilient seals with line contact surfaces on an upstroke. Further, a bearing disposed above seals on a piston of the actuator assists in keeping contaminants out of the seal area of the piston.
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Deaton Thomas Michael
Jancha Robert A.
Sides, III Winfield M.
Smith Roddie R.
Bagnell David
Gay Jennifer H
Moser Patterson & Sheridan
Weatherford / Lamb, Inc.
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