Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1978-04-13
1980-11-25
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
166113, 166187, 324367, E21B 2300, G01V 324
Patent
active
042361133
ABSTRACT:
An electrical well logging system is disclosed wherein the well logging tool is enclosed at least in part by an expandable sleeve having a band of electrodes located in the outer surface thereof. The band of electrodes is located in a plane which is perpendicular to the vertical axis of the well logging tool. When the well logging tool is in a desired position in the borehole, the expandable sleeve is expanded to place the electrodes located therein in contact with the adjacent sidewall surface of the borehole. Current is injected into the formation surrounding the borehole and the voltage induced by the current is measured. A phase comparison of the current injected into the formation and the voltage sensed in response to the injected current can be utilized to determine if clay is present in the formation.
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Phillips Petroleum Company
Strecker Gerard R.
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