Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1994-06-15
1995-10-31
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324369, G01V 320, G01V 318
Patent
active
054633206
ABSTRACT:
A logging tool for use in determining the resistivity of an underground formation surrounding a borehole comprises a mandrel with two transmitters spaced apart thereon, each serving to establish a current in the mandrel and in the underground formation. A series of electrodes are spaced along the body between the transmitters and sensors, located at each electrode, measure radial current flow along a path from the mandrel to the underground formation via a respective electrode. Sensors also provide the axial current flowing along the whole mandrel and at positions corresponding to each electrode. A method of determining the formation resistivity includes the steps of measuring the radial currents R.sub.1 R.sub.2 from the mandrel to the formation via each electrode and obtaining the axial currents M.sub.01 M.sub.02 along the mandrel at each electrode due to each transmitter; measuring the total axial current M.sub.12 along the mandrel from the first or second transmitter and deriving the resistivity of the formation from the radial focused current R.sub.c for each electrode according to the relationship R.sub.c =1/M.sub.21 (M.sub.02 R.sub.1 +M.sub.01 R.sub.2).
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Bagersh Abdullah A.
Bonner Stephen D.
Jundt Jacques A.
Luling Martin G.
Rosthal Richard A.
Hyden Martin D.
Pojunas Leonard W.
Schlumberger Technology Corporation
Snow Walter E.
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