Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1984-05-31
1989-07-04
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324329, 324333, G01V 308
Patent
active
048454338
ABSTRACT:
A wall-engaging apparatus for microinductively investigating a characteristic of earth formations traversed by a borehole includes an antenna set mounted in a longitudinally elongated body adapted for a sliding engagement with the wall of the borehole. The antenna set includes a conductive backplane member mounted in the body parallel to the wall-engaging face of the body and first, second, and third half-loop antenna elements. The half-loop antenna elements are coaxial located symmetrically about the half-loop of the first antenna element, with their respective ends located at the backplane member to couple image currents in the backplane. The locations of the second and third antenna elements are further selected to place the second and third antenna elements in electromagnetic symmetry relative to the first antenna element. A differential coupler is included for coupling the second and third antenna elements.
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Chew Weng C.
Clark Brian
Dudley Donald G.
Kleinberg Robert L.
Carroll David H.
Eisenzopf Reinhard J.
Lee Peter Y.
Mueller Robert W.
Schlumberger Technology Corporation
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