Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1988-05-31
1990-02-13
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324346, 324359, 324368, 324372, G01V 328, G01V 324
Patent
active
049010239
ABSTRACT:
This invention relates to the measurement of the longitudinal components of low frequency A.C. magnetic fields from within cased boreholes which are used to measure the geophysical properties of geological formations. The applied A.C. magnetic fields are generated by passing low frequency A.C. current through insulated wires or by conducting low frequency A.C. current through geological formations. The currents generating the applied A.C. magnetic fields are in the frequency range between 0.001 Hz and 20 Hz. The measured longitudinal components of the resulting total A.C. magnetic fields are responsive to various geophysical parameters which include the resistivities of the portions of the geological formations subject to said applied A.C. magnetic fields.
REFERENCES:
patent: 2790138 (1957-04-01), Poupon
patent: 2874348 (1959-02-01), Brant et al.
patent: 2919396 (1959-12-01), McLaughlin et al.
patent: 3984758 (1976-10-01), Millon
patent: 4748415 (1988-05-01), Vail, III
ParaMagnetic Logging Inc.
Strecker Gerard R.
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