Magnetic ranging whle drilling using an electric dipole...

E - Fixed Constructions – 21 – B

Patent

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E21B 47/022 (2006.01)

Patent

CA 2721443

A system and methods for drilling a well in a field having an existing well are provided. In accordance with one embodiment, a method of drilling a new well in a field having an existing well includes drilling the new well using a bottom hole assembly (BHA) having a drill collar divided by an insulated gap, generating a current on the drill collar of the BHA while drilling the new well, and measuring from the existing well a magnetic field caused by the current on the drill collar of the BHA. Using measurements of the magnetic field, the relative position of the new well to the existing well may be determined.

L'invention concerne un système et un procédé pour forer un puits dans un champ qui comprend un puits existant. Selon un mode de réalisation de l'invention, un procédé de forage d'un nouveau puits dans un champ qui comprend un puits existant consiste : à forer le nouveau puits au moyen d'un ensemble de fond de trou (BHA) qui comprend une masse-tige divisée par un espacement isolé; à générer un courant sur la masse-tige du BHA pendant le forage du nouveau puits; et à mesurer, à partir du puits existant, un champ magnétique provoqué par le courant sur la masse-tige du BHA. Au moyen des mesures du champ magnétique, la position du nouveau puits par rapport au puits existant peut être déterminée.

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