Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1995-08-08
1998-10-13
Tsay, Frank
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166386, 166319, E21B 3410
Patent
active
058198539
ABSTRACT:
A valve adapted to be disposed in a wellbore for use during a drill stem test includes one or more rupture discs which, when ruptured by one or more annulus pressures or a tubing pressure, moves a mandrel in either of two different longitudinal directions. When the mandrel is moved, one of four possible events could occur. First, a pair of flapper valves will close, and, after the pair of flapper valves close, a reversing port will open. Second, a ball valve will successively close and open and, simultaneously, a reversing port will successively open and close. Third, a port will move into congruence with a one-way check valve allowing a fluid to flow from within an internal area within the valve to an external area around the valve. Fourth, a port will move out of congruence with a one-way check valve thereby preventing a fluid from flowing from the external area around the valve to an internal area within the valve.
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Bouchard John H.
Ryberg John J.
Schlumberger Technology Corporation
Tsay Frank
LandOfFree
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