Magnetization of target well casing string tubulars for...

E - Fixed Constructions – 21 – B

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E21B 47/00 (2012.01) E21B 47/0228 (2012.01)

Patent

CA 2490953

A method for magnetizing a wellbore tubular is disclosed. The method includes magnetizing a wellbore tubular at three or more discrete locations on the tubular. In exemplary embodiments the magnetized wellbore tubular includes at least one pair of opposing magnetic poles located between longitudinally opposed ends of the tubular. Wellbore tubulars magnetized in accordance with this invention may be coupled to one another to provide a magnetic profile about a section of a casing string. Passive ranging measurements of the magnetic field about the casing string may be utilized to survey and guide drilling of a twin well. Such an approach advantageously obviates the need for simultaneous access to both wells.

L'invention porte sur une méthode de magnétisation de tubage de puits. La méthode comprend la magnétisation d'un tubage de puits à trois ou plus emplacement discrets sur le tubage. Dans des modèle de réalisation, le tubage de puits magnétisé comprend au moine une paire de pôles magnétiques opposés entre des extrémités opposés longitudinalement du tubage. Les tubages de puits magnétisés selon la présente invention peuvent être couplés entre eux afin de fournir un profilé magnétique pour une section de colonne de tubage. Les mesures de portée passives du champ magnétique autour de la colonne de tubage peuvent être utilisées pour effectuer le levé et guider le forage d'un puits jumelé. Cette approche rend inutile le besoin d'un accès simultané aux deux puits.

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