Proximity detection system for deep wells

G - Physics – 01 – V

Patent

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Details

G01V 3/24 (2006.01) E21B 47/09 (2012.01)

Patent

CA 2747973

A method and apparatus for magnetic field measurements to determine the proximity of a nearby target incorporating electrically conductive material includes a drill string (54) having multiple drill pipe sections (56, 57, 58, 59) connected end-to-end, with at least one of the drill pipe sections (57) being electrically conductive and isolated to provide an electrode section A nonmagnetic drill pipe section (84) is connected in the drill string below the electrode section (57), and a hydraulic motor (62) having a rotatable drill bit sub (70) carrying a magnetic field sensing instrument package (102) is connected to a lowermost end of the drill string. A power supply provides a time-varying current to the drill pipe electrode section (57) to produce a corresponding target current magnetic field to be detected at the drill bit instrument (10).

L'invention porte sur un procédé et un appareil destinés à des mesures de champ magnétique pour déterminer la proximité d'une cible proche incorporant un matériau électriquement conducteur, lesquels procédé et appareil comprennent un train de tiges de forage (54) présentant de multiples sections de tuyau de forage (56, 57, 58, 59) raccordées bout à bout, au moins l'une des sections de tuyau de forage (57) étant électriquement conductrice et isolée pour fournir une section d'électrode. Une section de tuyau de forage non magnétique (84) est raccordée au train de tiges de forage sous la section d'électrode (57), et un moteur hydraulique (62) pourvu d'une réduction de tige de trépan rotative (70) portant un boîtier d'instrument de détection de champ magnétique (102) est relié à l'extrémité la plus inférieure du train de tiges de forage. Une alimentation électrique fournit un courant variant dans le temps à la section d'électrode de tuyau de forage (57) pour produire un champ magnétique de courant cible correspondant devant être détecté au niveau de l'instrument de trépan (10).

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