Permanent EM monitoring systems using capacitively coupled source electrodes
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United States of America Patent
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Sep 15, 2020
Grant Date -
Dec 8, 2016
app pub date -
Mar 25, 2014
filing date -
Mar 25, 2014
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Abstract
An illustrative permanent electromagnetic (EM) monitoring system including a casing string positioned inside a borehole penetrating a formation, a source electrode attached to the casing string, an electrically insulating layer on an outer surface of the source electrode that provides a capacitive coupling of the source electrode to the formation, a power supply coupled to the source electrode which injects electrical current into the formation via the capacitive coupling, and a processing unit that determines a formation property based on at least the current received by a return electrode.
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