Wells – Processes – Placing or shifting well part
Reexamination Certificate
2006-11-28
2006-11-28
Neuder, William (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S187000
Reexamination Certificate
active
07140447
ABSTRACT:
A subsurface annular safety barrier including a tubing disposed within a wellbore casing forming a casing-tubing annulus to allow fluid flow from and/or to a subterranean formation, and an annular barrier carried by the tubing and positioned in the casing-tubing annulus proximate the top of a formation, separating communication between the formation and the upper portion of the casing-tubing annulus above the annular barrier, wherein the annular barrier is set in an open position to allow fluid communication between the formation and the upper portion of the casing-tubing annulus and operationally activatable, without mechanical manipulation of a pipe string, to a closed position to prevent undesired fluid flow between the formation and upper portion of the casing-tubing annulus.
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Hilsman Youel G.
Krawiec Peter
Leismer Dwayne D.
Castano Jaime A.
Coy Nicole A
Ehrlich Henry L.
McEnaney Kevin P.
Schlumberger Technology Corporation
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