Anti-collision method for drilling wells

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/022 (2006.01) E21B 47/024 (2006.01) E21B 47/09 (2006.01) G01V 3/26 (2006.01)

Patent

CA 2693798

Methods for drilling a new well in a field having a plurality of existing cased wells using magnetic ranging while drilling are provided. In accordance with one embodiment, a method of drilling a new well in a field having an existing cased well includes drilling the new well using a bottom hole assembly (BHA) having a drill collar having by an insulated gap, generating a current on the BHA while drilling the new well, such that some of the current passes through a surrounding formation and travels along a casing of the existing cased well, measuring from the BHA a magnetic field caused by the current traveling along the casing of the existing cased well, and adjusting a trajectory of the BHA to avoid a collision between the new well and the existing cased well based on measurements of the magnetic field.

L'invention concerne des procédés destinés à forer un nouveau puits dans un champ présentant une pluralité de puits tubes existants, en utilisant une mesure magnétique pendant le forage. Selon un mode de réalisation, un procédé de forage d'un nouveau puits dans un champ présentant un puits tube existant comprend les étapes consistant à forer le nouveau puits en utilisant un ensemble de fond de puits (BHA) présentant une masse-tige avec un intervalle isolé ; générer un courant sur le BHA tout en forant le nouveau puits, de sorte qu'une partie du courant passe à travers une formation environnante et voyage le long d'un tubage du puits tube existant ; mesurer, à partir du BHA, un champ magnétique causé par le passage du courant le long du tubage du puits tube existant ; et ajuster une trajectoire du BHA pour éviter une collision entre le nouveau puits et le puits tube existant, en se basant sur les mesures du champ magnétique.

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