Washpipeless isolation strings and methods for isolation

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

Reexamination Certificate

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Details

C166S386000, C166S329000, C166S332400

Reexamination Certificate

active

07124824

ABSTRACT:
An isolation string having: an upper packer; and an isolation pipe in mechanical communication with the upper packer, wherein the isolation pipe comprises a pressure activated valve and an object activated valve. A method having: running-in an isolation string on a service tool, wherein the isolation string comprises a pressure activated valve and a object activated valve; setting the isolation string in the casing adjacent perforations in the casing; releasing an object from the service tool, whereby the object travels to the object activated valve; closing the object activated valve with the released object; and withdrawing the service tool from the well.

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