Oil-based flushed zone electromagnetic well logging system and m

Details Oil-based flushed zone electromagnetic well logging system and m Oil-based flushed zone electromagnetic well logging system and m

1986-12-22

1989-03-07

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 330, G01V 338

Patent

active

048109703

ABSTRACT:
An electromagnetic energy well logging system and method includes transmitting electromagnetic energy substantially at a frequency of 4 MHz into an earth formation from a borehold traversing the earth formation. The true resistivity of an oil-based flushed zone of the earth formation is derived in accordance with the transmitted electromagnetic energy after it is passed through at least a portion of the oil-based flushed zone.

REFERENCES:
patent: 3551797 (1970-12-01), Gouilloud et al.
patent: 4107597 (1978-08-01), Meador et al.
patent: 4401947 (1983-08-01), Cox
patent: 4422043 (1983-12-01), Meador
patent: 4451789 (1984-05-01), Meador
patent: 4609873 (1986-09-01), Cox et al.
patent: 4622518 (1986-11-01), Cox et al.
Grubb et al., Borehole Measurements . . . in the 300 KHz to 25 MHz Frequency Range, Radio Science, vol. 11, No. 4, pp. 275-283, Apr. 1976.

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