Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1987-10-30
1990-02-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
G01V 330, G01V 318
Patent
active
048991120
ABSTRACT:
Well logging techniques and apparatus are disclosed for determining formation resistivity at different radial depths of investigation and with greater accuracy than prior techniques, for determining the existence, locations and properties of beds and caves, and for determining changes in the size of a borehole.
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Clark Brian
Jundt Jacques
Luling Martin
Ross Michael O.
Borst Stephen L.
Eisenzopf Reinhard J.
Novack Martin M.
Ryberg John J.
Schlumberger Technology Corporation
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