A method and apparatus for determining the resistivity of a...

G - Physics – 01 – V

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G01V 3/20 (2006.01)

Patent

CA 2375272

The invention relates to a method and apparatus for studying the resistivity of a geological formation around a bore-hole fitted with metal casing. An electric current is applied to the casing so as to cause current to leak into said formation at a given level, and said current is shunted by a feedback circuit in contact with the casing on either side of the measurement level, said circuit being organized to ensure that the current flowing along the casing at said level is small compared with the shunt current, the difference between the voltage drops on the adjacent sections of casing situated on either side of the measurement level is determined, and the leakage current (Ifor) is deduced therefrom.

L'invention concerne un procédé et un dispositif permettant d'étudier la résistivité d'une formation géologique située autour d'un trou de forage garni de tubage métallique. Le procédé comporte les étapes consistant à appliquer un courant électrique au tubage de façon provoquer une fuite de courant dans ladite formation à un niveau donné ; dériver ledit courant par un circuit de réaction en contact avec le tubage des deux côtés du niveau de mesure, ledit circuit étant organisé de manière à garantir que le courant passant le long du tubage audit niveau est faible par comparaison avec le courant de dérivation ; déterminer la différence entre les chutes de tension produites sur les parties adjacentes de tubage situées des deux côtés du niveau de mesure; et déduire le courant de fuite (Ifor) de celle-ci.

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