Method and apparatus for well-bore proximity measurement...

Details Method and apparatus for well-bore proximity measurement... Method and apparatus for well-bore proximity measurement...

E - Fixed Constructions

21

B

E21B 47/09 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2699330

A rotating, transversely magnetized, magnet on a drill collar induces magnetization in a casing of a preexisting well. A coil rotating synchronously with the magnet produces a current at twice the frequency of rotation and having an amplitude that depends upon the distance from the magnet to the preexisting well. Alternatively, a variable magnetic field is produced in the casing using a switchable magnet.

Selon l'invention, un aimant rotatif à aimantation transversale sur une masse-tige induit une aimantation dans un tubage d'un puits préexistant. Une bobine tournant de façon synchrone avec l'aimant produit un courant à une fréquence égale à deux fois la fréquence de rotation, l'amplitude de ce courant dépendant de la distance entre l'aimant et le puits préexistant. Dans une variante, un champ magnétique variable est produit dans le tubage au moyen d'un aimant commutable.

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