Méthode pour corriger les mesures de la direction

Method for correcting directional surveys

Verfahren zum Korrigieren von Richtungsmessungen

Abstract

A method for determining the orientation of a borehole from measurements of the gravity and magnetic field within the borehole. The hole azimuth is obtained corrected for sources of permanent, induced and electrically caused magnetic interference. Information-on these sources and on the earth's magnetic field is computed as a by product so that in the fullest application of the invention no prior information is required. The method uses several survey measurements to provide the required data for the correction, and provides quality assurance indicators that do not depend on ad hoc rules.

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Patent Citations (3)

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    WO-9964720-A1December 16, 1999Baker Hughes IncorporatedProcede d'etalonnage de mesures magnetiques et d'estimation d'incertitude