Sub-surface formation boundary detection using an electric-field borehole telemetry apparatus
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United States of America Patent
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Aug 8, 2017
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Dec 19, 2014
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Sep 26, 2011
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Abstract
The method of maintaining drill bit advancement in an underground formation that contains shale, including providing an electrical signal from an insulated gap location in a drill string substantially directly behind the bit in the formation, detecting substantial change in a signal as the bit advances, and changing the direction of drilling of the bit as a function of a signal change, to thereby maintain the direction of bit advancement in the formation.
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