Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-10-24
1977-03-15
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 310, G01V 318
Patent
active
040126897
ABSTRACT:
The invention disclosed herein includes methods and apparatus for determining the resistivity and dielectric constant of earth materials in the vicinity of a well borehole. A radio frequency electromagnetic field in the frequency range from 20 to 40 megahertz is generated in a borehole and the total electromagnetic field at two longitudinally spaced locations is detected. Measurements of the relative phase shift in the field between the detector locations and the amplitude of the field at least at one of the detector locations may then be interpreted according to predetermined relationships in terms of the earth formation resistivity and dielectric constant.
REFERENCES:
patent: 3209254 (1965-09-01), Hossmann
patent: 3539911, Youmans et al.
patent: 3551797 (1970-12-01), Gouilloud et al.
patent: 3657659 (1972-04-01), Johnson
patent: 3760270 (1973-09-01), Irvin
patent: 3849721 (1974-11-01), Calvert
patent: 3906361 (1975-09-01), Nessler et al.
Daev, D. S., Dielectric Induction Logging IZV Vyssh. Ucheb Zaved., Geol. Razved. 8, No. 11, pp. 110-119(1965).
Antonov et al., Two--Frequency Dielectric Induction Logging With Two Sondes Geol. Geofiz. 9, No. 4, pp. 94-101 (1968).
Cox Percy T.
Meador Richard A.
Thompson Larry W.
Beard William J.
Ries C. G.
Strecker Gerard R.
Texaco Inc.
Whaley T. H.
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