System and method for downhole operation using pressure...

Wells – Processes – Operating valve – closure – or changeable restrictor in a well

Reexamination Certificate

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C166S332400, C166S227000

Reexamination Certificate

active

07665526

ABSTRACT:
An isolation system for producing oil and gas from one or more formation zones and methods of use are provided comprising one or more pressure activated and tool shiftable valve assemblies. The tool shiftable valve may be actuated before or after actuation of the pressure activated valve.

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