Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1989-12-21
1991-08-06
Wieder, Kenneth A.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324346, 324368, G01V 328
Patent
active
050381075
ABSTRACT:
High resolution induction logs (28) are obtained through borehole casing (15) by magnetically saturating the casing (15), logging with a tool (10) having different transmitter (35a, 35b)-to-receiver (40) coil spacings, and determining the formation (30) conductivities as a function of the coil spacings, coil frequency, and phase difference between the signals at these spacings. The logging is preferably done at an intermediate frequency which gives good resolution but is little affected by the saturated casing.
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Chemali Roland E.
Gianzero Stanley C.
Sinclair Paul
Su Shey-Min
Beard William J.
Edmonds Warren S.
Halliburton Logging Services Inc.
Wieder Kenneth A.
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