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Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations

Patent ·
OSTI ID:6278742
; ; ;
Apparatus is described for determining the resistivity of formations surrounding an earth borehole, comprising: an electrically conductive metal body movable through the borehole; a toroidal coil antenna disposed on said body; means for energizing said toroidal antenna to induce a current which travels in a path that includes said body and said formations; an electrode disposed on said body; and means for measuring at said electrode an electrical signal resulting from said current, said electrical signal being an indication of the resistivity of said formations.
Assignee:
Schlumberger Technology Corp., Houston, TX (United States)
Patent Number(s):
A; US 5235285
Application Number:
PPN: US 7-786137
OSTI ID:
6278742
Country of Publication:
United States
Language:
English

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Related Subjects

440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
58 GEOSCIENCES
580000* -- Geosciences
ANTENNAS
BOREHOLES
CAVITIES
DESIGN
ELECTRIC CONDUCTIVITY
ELECTRIC LOGGING
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRODES
EQUIPMENT
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
MWD SYSTEMS
PHYSICAL PROPERTIES
RESERVOIR ROCK
RESISTIVITY LOGGING
WELL LOGGING