Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1988-03-28
1990-06-05
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324354, 324366, G01V 320
Patent
active
049317369
ABSTRACT:
The method of measuring local rock inhomogeneities on the wall of a borehole is disclosed. The method of measurement includes the step of generating microelectric fields in a conductive way on an area of the wall of the borehole insulated from the drilling mud by an insulating pad which carries electrodes and excludes direct electrical contact between the electrodes and the conductive borehole liquid. The local current intentities are measured at, at least two, different places perpendicularly to the wall of the borehole and the measured current intensities are compared to each other. Alternatively, a local voltage difference created by current flowing first parallel to the wall of the borehole and then an absolute voltage created by the same current in another section of flow where the current is perpendicular to the wall of the borehole may be measured and the measured voltages compared to each other. The field generating step and the measuring step are repeated continuously versus borehole axis, and the local rock inhomogeneities are determined from the magnitudes of the ratios produced by the comparisons made. The apparatus comprises electrodes arranged in insulating pads lowered into the borehole and supported therein, connected by a cable with surface units.
REFERENCES:
patent: 2669690 (1954-02-01), Doll
patent: 2712629 (1955-07-01), Doll
patent: 2750557 (1956-06-01), Bricaud
patent: 2813248 (1957-11-01), Ferre
patent: 4567759 (1986-02-01), Ekstrom et al.
Barlai Zoltan
Dorcsi Geza
Rez Ferenc
Vamos Attila
Edmonds Warren S.
Koolajkutato Vallat
Magyar Allami Eotvos Lorand Geofizikai Intezet
Strecker Gerard R.
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