Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1989-11-16
1991-08-27
Wieder, Kenneth A.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
G01V 326
Patent
active
050436694
ABSTRACT:
Methods and apparatus are provided for measuring the acoustically modulated electronic properties of geological formations and cement layers adjacent to cased boreholes. Current is passed from an electrode in electrical contact with the interior of the borehole casing to an electrode on the surface of the earth. Voltage measuring electrodes in electrical contact with the interior of the casing measure the voltage at various points thereon. The voltage differences between discrete pairs of the voltage measuring electrodes provide a measurement of the leakage current conducted into formation in the vicinity of those electrodes. Simultaneously subjecting the casing and formation to an acoustic source acoustically modulates the leakage current measured thereby providing a measure of the acoustically modulated electronic properties of the adjacent formation. Similarly, methods and apparatus are also described which measure the leakage current into formation while simultaneously subjecting the casing to an applied magnetic field which therefore allows measurement of the magnetically modulated electronic properties of the casing and the adjacent formation.
REFERENCES:
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patent: 4796186 (1989-01-01), Kaufman
patent: 4820989 (1989-04-01), Vail, III
patent: 4837518 (1989-06-01), Gard et al.
patent: 4882542 (1989-11-01), Vail, III
patent: 4901023 (1990-02-01), Vail, III
Edmonds Warren S.
Para Magnetic Logging, Inc.
Wieder Kenneth A.
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