Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1995-12-11
1997-10-21
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324371, G01V 324
Patent
active
056800495
ABSTRACT:
An apparatus for measuring the resistivity of earth formations penetrated by a wellbore having a conductive conduit. The apparatus includes an elongated sonde mandrel, a plurality of electrodes positioned at axially spaced apart locations along the mandrel, the electrodes being electrically insulated from the mandrel and from each other, the electrodes adapted to electrically contact the conduit and positioned collinearly so that the electrodes contact the conduit when the mandrel is radially displaced towards the wall of the conduit. Some electrodes are for injecting electrical current into the conduit, other electrodes are for measuring voltage drop along the conduit at axially spaced apart locations. The mandrel includes selectively extensible locking arms for urging the mandrel into contact with the conduit. The arms are radially positioned opposite to the electrodes. The apparatus includes a source of electrical current connected to the current injector electrodes, a circuit for measuring output of the source of electrical current, voltage measuring circuits connected to the voltage drop electrodes, and means for recording measurements of current and voltage drop.
REFERENCES:
patent: 3356146 (1967-12-01), Anderson
patent: 5075626 (1991-12-01), Vail, III
patent: 5543715 (1996-08-01), Singer et al.
Bullock H. Wade
Fanini Otto
Gissler Robert W.
Maissa Jacques
Rellinger Peter
Fagin Richard A.
Snow Walter E.
Western Atlas International Inc.
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