Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1993-04-16
1995-08-15
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324347, 324366, 324369, G01V 328, G01V 318
Patent
active
054422949
ABSTRACT:
The present invention relates to a method and apparatus for measuring current resulting from a magnetic field source (i.e., a transmitter) positioned on a drill collar. A plurality of current detectors are carried on the surface of the drill collar in an insulated relationship thereto. Each of the detectors is positioned to detect the value of current being received by the same from the formation. In this connection, the detectors are positioned at differing longitudinally displaced positions relative to the axis of the drill collar and the transmitting antenna(s), whereby each detects a different value of current. These currents will respectively flow through successively deeper layers of the formation. The longitudinal displacement is directly proportional to the depth of investigation, whereby the depth of investigation is many times the longitudinal distance between the current detector and the corresponding transmitting antenna. This set of measurements then produces an estimate of the resistivity profile of the formation adjacent the borehole.
REFERENCES:
patent: 2919396 (1959-12-01), McLaughlin et al.
patent: 2963640 (1960-12-01), Buckner, Jr.
patent: 3383586 (1968-05-01), Hoehn, Jr.
patent: 3493850 (1970-02-01), Schuster
patent: 4451789 (1984-05-01), Meador
patent: 4609873 (1986-09-01), Cox et al.
patent: 4785247 (1988-11-01), Meador et al.
Baker Hughes Incorporated
Edmonds Warren S.
O'Shea Sandra L.
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