Lwd resistivity device with inner transmitters and outer...

G - Physics – 01 – V

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G01V 3/30 (2006.01)

Patent

CA 2381169

A borehole tool (10) for logging resistivity of geologic formations, having at least two inner transmitters (14, 16) surrounded by at least two outer receivers (18, 20). Each transmitter (14, 16) is sequentially excited, and measurements are taken at each of the receivers (18, 20). The phase differences between these received signals are determined, once for each transmitter(14, 16), and the two values are averaged to estimate the resistivity value of the surrounding formations. More than two receivers (18, 20) can be used. An azimuthal receiver array (42, 43) is also used to identify boundary transitions.

La présente invention concerne un outil de forage, destiné à une diagraphie par résistivité de formations géologiques, contenant au moins deux émetteurs internes entourés d'au moins deux récepteurs extérieurs. Chaque émetteur est excité séquentiellement, et des mesures sont prises à chaque récepteur. Les différences de phase entre les signaux reçus sont déterminés, une fois pour chaque émetteur, et les deux valeurs sont moyennées afin d'estimer la valeur de résistivité des formations entourantes. Il est possible d'utiliser plus de deux récepteurs. On peut aussi utiliser un réseau de récepteurs azimutaux afin d'identifier des discontinuités.

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