Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2006-02-14
2006-02-14
Gay, Jennifer H. (Department: 3672)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C166S051000, C166S238000, C166S321000, C166S386000
Reexamination Certificate
active
06997263
ABSTRACT:
A multi zone isolation tool (50) for use in a subterranean wellbore includes a first tubular and a second tubular disposed within the first tubular forming an annular flow path (110a, 110b) therebetween and a central flow path (70a, 80a, 80b) through the second tubular. An annular valving assembly (90, 80) is positioned in the annular flow path (110a, 110b) and a central valving assembly (148, 186) is positioned in the central flow path (70a, 80a, 80b). The central valving assembly (186) is operably coupled to the annular valving assembly (90) such that when the central valving assembly (148, 186) is in a closed position, a pressure variation in the central flow path (70a, 80a,80b) will operate the annular valving assembly (90, 80) from a closed position to an open position.
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Campbell Patrick F.
Dawson Mark E. P.
Henderson William David
Shivers Jay B.
Gay Jennifer H.
Youst Lawrence R.
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