Electromagnetic formation evaluation tool

Details Electromagnetic formation evaluation tool Electromagnetic formation evaluation tool

1991-01-16

1992-08-11

Wieder, Kenneth A.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

343788, 324334, 324337, G01V 312, G01V 330, H01Q 706

Patent

active

051382636

ABSTRACT:
A tool for evaluating electrical properties of an earth formation surrounding a borehole while drilling the borehole is disclosed. The tool includes a housing for connecting upper and lower portions of a drillstring, a transmit antenna for generating electromagnetic waves at least two receiving antennas for receiving electromagnetic waves and magnetic elements associated with each of the antennas for electromagnetically coupling each of the antennas with the formation. The tool provides improved transmit efficiency and improved receiving sensitivity.

REFERENCES:
patent: 977462 (1910-12-01), Matthews
patent: 3377549 (1968-04-01), Newman et al.
patent: 4107597 (1978-08-01), Meador et al.
patent: 4739325 (1988-04-01), MacLeod
patent: 4994747 (1991-02-01), Stolarczyk

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