Well logging apparatus for obtaining azimuthally sensitive...

G - Physics – 01 – V

Patent

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G01V 3/20 (2006.01) E21B 47/01 (2006.01) G01V 3/24 (2006.01)

Patent

CA 2539676

An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically conductive tool body. An AC voltage supply is coupled to the tool body on opposing sides of the magnetically permeable ring, with at least one connecting conductor crossing outside the ring. Exemplary embodiments of this invention may further include one or more current sensing electrodes deployed in and electrically isolated from an outer surface of the tool body and may be utilized to make azimuthally resolved formation resistivity measurements

Cette invention concerne un appareil de mesure de la résistivité sensible en azimut d'une formation souterraine. L'appareil comprend un anneau magnétiquement perméable déployé autour d'un corps d'outil conducteur d'électricité. Une tension alternative est couplée au corps de l'outil, à l'opposé de l'anneau magnétiquement perméable, avec au moins un conducteur de raccord sortant de l'anneau. D'autres versions de cette invention pourraient inclure une ou plusieurs électrodes de détection déployées dans le corps de l'outil, isolées d'une surface extérieure de ce dernier, et qui pourraient être utilisées pour des mesures de résistivité de formation résolues en azimut.

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