Deep penetration well logging sonde

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter

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324338, G01V 330, G01V 318

Patent

active

047001410

ABSTRACT:
A well logging system and method of the present invention determines the dielectric constant and/or conductivity of earth formations some of which have fluid invasion. The system and method of the present invention include the transmission of electromagnetic energy into the earth formations from a first location in a borehole in the formations at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations. Electromagnetic energy is received by receivers at three locations in the borehole which are spaced longitudinally from the location of the transmission of the electromagnetic energy. The receivers provide signals representative of the received electromagnetic energy. The dielectric constant and/or resistivity of the earth formations are determined in accordance with the signals from the three receivers.

REFERENCES:
patent: 4107598 (1978-08-01), Meador et al.
patent: 4185238 (1980-01-01), Huchital et al.
patent: 4338567 (1982-07-01), Coates

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