Schlumberger Technology Corporation

Bernadette Tabanou, Legal Representative

Dzevat Omeragic

Jacques R Tabanou

Jean P Seydoux

Qiming Li

Jian Yang

An orientation vector, referred to hereinafter as the 'geosteering vector,' is directed to the more conductive formation area within the DOI of the tool and away from the more resistive formation areas. Accordingly, drilling in a direction opposite the geosteering vector leads to more resistive formation. Also, the disclosed geosteering vectors obtained from the real and imaginary components will not align with each other for non-planar formations and therefore the misalignment of the geosteering obtained from real and imaginary components is indicative of a non-planar formation. A superposition method is disclosed which can be used to calculate electromagnetic (EM) couplings in a non-planar geometry formation (as well as in a planar geometry formation) in real time, without requiring two or three dimensional modeling calculations.

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Houston, TX, United States of America

Bernadette Tabanou, Legal Representative