ELECTROMAGNETIC SURVEY USING METALLIC WELL CASINGS AS ELECTRODES

Methods and related systems are described for making measurements of an electromagnetic field in a subterranean formation that has been induced by a current loop (150, 160, 162). The current loop uses one or more steel wellbore casings as electrodes. Receiver arrays (192) are positioned either at su...

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Bibliographische Detailangaben
Hauptverfasser:	ZHANG, HONG, ROSTHAL, RICHARD A
Format:	Patent
Sprache:	eng ; fre
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:	Methods and related systems are described for making measurements of an electromagnetic field in a subterranean formation that has been induced by a current loop (150, 160, 162). The current loop uses one or more steel wellbore casings as electrodes. Receiver arrays (192) are positioned either at surface/seaf loor, in the same, or in nearby wells. In the most general case, the receivers are tri-axial. A section of metallic casing in one well can be used as a current source and the electromagnetic field at surface can be measured using an array of EM receivers (192) placed at a range of distances from the wellbore.