E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/09 (2006.01) E21B 47/02 (2006.01)
Patent
CA 2693917
A method of locating a conductive target from a wellbore includes generating a current flowing across an insulated gap in a downhole tool positioned in the wellbore, measuring an azimuthal magnetic field with at least one external magnetometer located proximate the exterior of the downhole tool, measuring a secondary magnetic field using a magnetometer disposed inside the downhole tool, computing at least one of a direction and a distance to the conductive target.
Un procédé de localisation d'une cible conductrice à partir d'un puits de forage comprend la génération d'un courant circulant à travers un espace isolé dans un outil de forage positionné dans le puits de forage, la mesure d'un champ magnétique azimutal au moyen d'un ou de plusieurs magnétomètres externes situés à proximité de l'extérieur de l'outil de forage, la mesure d'un champ magnétique secondaire par l'utilisation d'un magnétomètre disposé à l'intérieur de l'outil de forage, le calcul d'une direction et/ou d'une distance par rapport à la cible conductrice.
Schlumberger Canada Limited
Smart & Biggar
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