Downhole electrode for well guidance system

E - Fixed Constructions – 21 – B

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E21B 7/04 (2006.01) E21B 17/00 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2250769

A borehole guidance system for guiding reference well includes a multi- sectioned casing (14) in the reference well (10). A selected section of the casing (46), usually the lowest section, is electrically conductive and the next adjacent section (44) is electrically nonconductive. A wireline (60) connects a current source on the surface to the selected conductive section to produce a reference current (I) in the well. The reference current is injected into the earth and dissipated so that the current produces a reference magnetic field (100) surrounding the well which is unaffected by return currents.

La présente invention concerne un système de guidage de forage pour un puits de référence de guidage. Ce système se compose d'une succession de segments de tubages (14) disposés dans le puits de référence (10). Un segment choisi du tubage (46), d'habitude le segment inférieur, est électroconducteur, le segment immédiatement adjacent (44) n'étant pas électroconducteur. Raccordant à une source de courant située en surface le segment électroconducteur choisi, un câble (60) produit ainsi dans le puits un courant de référence (I). Ce dernier, une fois injecté dans le sol, se dissipe de façon à produire un champ magnétique de référence (100) entourant le puits sans pour autant en être affecté par les retours de courant.

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