An apparatus and method for wellbore resistivity determination and imaging using capacitive coupling

An apparatus and method for wellbore resistivity determination and imaging using capacitive coupling

An apparatus for obtaining resistivity parameters of earth formations (7) uses capacitive coupling (5) for injecting measure currents into the formation through a nonconducting mud. In one embodiment, a modulated electrical current is used. Alternatively, multifrequency measurements may be made to o...

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Hauptverfasser: MARTIN T EVANS, ALBERT A ALEXY, ANDREW R BURT, LEONTY A TABAROVSKY
Format: Patent
Sprache:eng
Schlagworte:
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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creator MARTIN T EVANS
ALBERT A ALEXY
ANDREW R BURT
LEONTY A TABAROVSKY
description An apparatus for obtaining resistivity parameters of earth formations (7) uses capacitive coupling (5) for injecting measure currents into the formation through a nonconducting mud. In one embodiment, a modulated electrical current is used. Alternatively, multifrequency measurements may be made to obtain the resistivity parameter. In an optional embodiment, the modulation frequency is in the AF range, making it possible to use prior art circuitry designed to reduce cross talk. Measurements may be made either on a wireline or in a MWD configuration.
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subjects DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
title An apparatus and method for wellbore resistivity determination and imaging using capacitive coupling
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