Wellbore surveying

E - Fixed Constructions – 21 – B

Patent

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E21B 47/022 (2006.01)

Patent

CA 2570080

This invention relates to surveying wellbores. In particular this invention provides methods of correcting magnetic surveys for the effects introduced by magnetic mud. The method of the present invention comprises, in broad terms, measuring gravitational and magnetic fields at least one position in the wellbore; comparing the measured fields with theoretical values, and introducing scale factors to adapt the measured values to equal the theoretical values thus making it possible to cope with the effects of magnetic mud.

L'invention se rapporte à des procédés de levée de puits de forage. Elle concerne notamment des procédés pour corriger les levées magnétiques pour tenir compte des effets dus une boue magnétique. Au sens large, l'invention consiste à mesurer les champs magnétiques et gravitationnels dans au moins une position dans le puits de forage, à comparer les champs mesurés avec les valeurs théoriques et à introduire des facteurs d'échelle pour adapter les valeurs mesurées afin d'arriver à l'égalité des valeurs théoriques et pouvoir ainsi prendre en compte les effets de la boue magnétique.

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