High frequency method and apparatus for electrical investigation

Details High frequency method and apparatus for electrical investigation High frequency method and apparatus for electrical investigation

1974-12-19

1976-08-03

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 10, G01V 318

Patent

active

039731812

ABSTRACT:
A method and apparatus for investigating earth formations traversed by the borehole containing an electrically nonconductive fluid in which a system of pad-mounted electrodes are arranged laterally around a well tool. A high frequency oscillator is coupled to the electrodes through a selectively variable capacitor. As the apparatus is passed through the borehole, the high frequency current produced by the oscillator capacitively couples the electrodes to the formation and provides a measure of the electrical conductivity or resistivity of the earth formation.

REFERENCES:
patent: 2018080 (1935-10-01), Martienssen
patent: 2592101 (1952-04-01), Aiken
patent: 2689329 (1954-09-01), Zimmerman
patent: 2749503 (1956-06-01), Doll
patent: 3060373 (1962-10-01), Doll
patent: 3113265 (1963-12-01), Woods et al.
patent: 3601692 (1971-08-01), Schuster
patent: 3699429 (1972-10-01), Ratz
patent: 3832631 (1974-08-01), Koga et al.
patent: R21797 (1941-05-01), Jakosky

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