Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2006-04-04
2006-04-04
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S322000
Reexamination Certificate
active
07021385
ABSTRACT:
A system and method for preventing blowouts during the deployment of a casing string into a wellbore. The system includes securing a casing coupling to a casing string and securing a retrievable check valve within the casing coupling. The retrievable check valve allows fluid from the surface to be pumped through the retrievable check valve. However, the retrievable check valve prevents upward fluid flow from the wellbore through the retrievable check valve to the surface.
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Carossino Ricardo M.
Follini Jean-Marc
Gotlib Mikhail V.
Ohmer Herve
Bagnell David
Echols Brigitte L.
Gaudier Dale V.
Schlumberger Technology Corporation
Someren Robert A. Van
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