Electromagnetic wave propagation well logging utilizing multiple

Details Electromagnetic wave propagation well logging utilizing multiple Electromagnetic wave propagation well logging utilizing multiple

1976-12-13

1978-08-15

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 318, G01V 312

Patent

active

041075978

ABSTRACT:
The invention disclosed herein includes methods and apparatus for determining true formation resistivity, flushed zone resistivity and invasion diameter of the earth formation in the vicinity of a well borehole. A radio frequency electromagnetic field in the frequency range from 800 kilohertz to 4 megahertz is generated in a borehole and the electromagnetic field is detected at a plurality of longitudinally spaced locations. Measurements of the attenuation and propagation velocity of the electromagnetic wave at the longitudinally spaced receivers may then be interpreted according to predetermined relationships in terms of the formation resistivity, flushed zone resistivity and invasion diameter surrounding the borehole.

REFERENCES:
patent: 3052835 (1962-09-01), Dunlap et al.
patent: 3086168 (1963-04-01), Buckner
patent: 3551797 (1970-12-01), Gouilloud 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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