METHOD AND APPARATUS FOR DETERMINING FORMATION RESISTIVITY AHEAD OF THE BIT AND AZIMUTHAL AT THE BIT

METHOD AND APPARATUS FOR DETERMINING FORMATION RESISTIVITY AHEAD OF THE BIT AND AZIMUTHAL AT THE BIT

A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses the drillbit and the adjacent portion of the drill collar as a focusing electrode for focusing the measure current from a measure electrode on the face or side of the dri...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FULDA, CHRISTIAN, GOREK, MATTHIAS
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
DETECTING MASSES OR OBJECTS
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses the drillbit and the adjacent portion of the drill collar as a focusing electrode for focusing the measure current from a measure electrode on the face or side of the drillbit. This provides the ability to see ahead of and azimuthally around the drillbit.