Azimuthally sensitive resistivity logging tool

G - Physics – 01 – V

Patent

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G01V 3/28 (2006.01) G01V 3/26 (2006.01)

Patent

CA 2743240

Various systems and methods for implementing an azimuthally sensitive resistivity logging tool are disclosed. One such method involves transmitting a primary magnetic field from one or more coils placed on a drill collar and receiving several electrical signals, where each of the electrical signals is received from a respective one of several sensors. The sensors are distributed around a circumference of a drill collar, and an axis of at least one of the sensors is perpendicular to an axis of the drill collar. Each of the electrical signals indicates a respective magnitude of a measurement of a reflected magnetic field, where the reflected magnetic field is reflected from an anomalous geological formation. The method calculates a vector measurement of the reflected magnetic field, based upon the electrical signals.

L'invention porte sur divers systèmes et procédés pour mettre en uvre un outil de diagraphie de résistivité sensible à l'azimut. Un tel procédé consiste à émettre un champ magnétique primaire par une ou plusieurs bobines placées sur une masse-tige et à recevoir plusieurs signaux électriques, chacun des signaux électriques étant reçu en provenance de l'un de plusieurs capteurs, respectivement. Les capteurs sont distribués autour d'une circonférence d'une masse-tige, et un axe d'au moins un des capteurs est perpendiculaire à un axe de la masse-tige. Chacun des signaux électriques indique une amplitude respective d'une mesure d'un champ magnétique réfléchi, le champ magnétique réfléchi étant réfléchi par une formation géologique anormale. Le procédé calcule une mesure vectorielle du champ magnétique réfléchi, sur la base des signaux électriques. La Figure 6 accompagne l'abrégé.

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