Method of processing data from a dual detector lwd density...

G - Physics – 01 – V

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G01V 5/04 (2006.01) G01V 5/10 (2006.01) G01V 5/12 (2006.01)

Patent

CA 2481096

A logging-while-drilling density sensor includes a gamma ray source and at least two Nal detectors spaced apart from the source for determining measurements indicative of the formation density. An acoustic caliper is used for making standoff measurements of the Nal detectors. Measurements made by the detectors are partitioned into standoff bins. An adaptive spine and rib method uses the standoff measurements to obtain density estimates. The method of the invention may also be used with neutron porosity logging devices.

Ce capteur, permettant une diagraphie en cours de forage, comporte une source de rayons gamma et au moins deux détecteurs Na1 distants de la source et analysant les mesures représentatives de la densité d'une formation. On utilise un calibre acoustique pour effectuer les mesures d'écart des détecteurs Na1. Les mesures prises par les détecteurs sont subdivisées en segments correspondant à l'écart. On utilise le procédé de correction adaptatif dit <= spine and rib >=, reposant sur des mesures d'écart, pour obtenir des valeurs estimatives de densité. Il est également possible d'utiliser le procédé selon l'invention avec des appareils de diagraphie de porosité neutronique.

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