METHOD AND APPARATUS FOR ISOLATING AND TESTING ZONES DURING REVERSE CIRCULATION DRILLING
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United States of America Patent
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app pub date -
Jan 4, 2008
filing date -
Feb 11, 2004
priority date (Note) -
Abandoned
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Abstract
An isolation tool for use with a concentric drill string for isolating a zone in a wellbore for testing is provided comprising a center tube and an outer casing forming an annular conduit therebetween and an expandable and contractible packer for sealing off an outside annular passage formed between a wall of the wellbore and an outer surface of the concentric drill string, whereby the isolation tool is adapted to be operably connected to the concentric drill string such that the isolation tool is in fluid communication with the concentric drill string.
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