Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1985-07-31
1987-06-30
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324347, 364422, G01V 324, G01V 338
Patent
active
046773851
ABSTRACT:
The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix resulting from measurements over a series of depth increments, utilizing an array of 2M-1 electrode assemblies of equal incremental spacing positioned on a rigid mandrel. While the array moves continuously along the borehole, current is continuously emitted from the centrally located current electrode allowing the impedance matrix to be formed by the principle of linear superposition in terms of voltage and voltage difference measurements between adjacent electrodes.
REFERENCES:
patent: 3076138 (1963-01-01), Stelzer
patent: 3457499 (1969-07-01), Tanguy
patent: 4087741 (1978-05-01), Mufti
Runge et al., Ultra-Long Spaced Electric Log (ULSEL), The Log Analyst, vol. 10, No. 5, Sep.-Oct., 1969, pp. 20-30.
Angehrn Jorg A.
Chapman Carroll W.
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Messner H. D.
Strecker Gerard R.
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