Apparatus and method for magnetizing casing string tubulars

H - Electricity – 01 – F

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H01F 13/00 (2006.01) E21B 17/00 (2006.01) E21B 19/14 (2006.01)

Patent

CA 2661876

An apparatus for magnetizing a wellbore tubular includes a plurality of co-axial magnetizing coils deployed on a frame. The coils are typically deployed about a track on which the tubular may be traversed. Exemplary embodiments may further include a magnetic field sensor disposed to measure the imparted magnetic field along the length of the tubular as it is removed from the track after magnetization. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.

Appareil de magnétisation d'un tube de puits de forage, ledit appareil comportant une pluralité de bobines de magnétisation coaxiales déployées sur une armature. Les bobines sont généralement déployées autour d'une voie de guidage sur laquelle le tube peut se déplacer. Des modes de réalisation peuvent également incorporer un détecteur de champ magnétique positionné de façon à mesurer le champ magnétique appliqué sur la longueur du tube lorsqu'il est retiré de la voie de guidage après avoir été magnétisé. Des modes de réalisation de l'invention assurent une commande semi-automatisée de la magnétisation du tube et permettent ainsi d'appliquer une signature magnétique reproductible sur chaque tube d'un grand nombre de tubes de puits de forage.

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