Multi-resolution borehole profiling

G - Physics – 01 – V

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G01V 1/48 (2006.01) E21B 49/00 (2006.01) G01V 1/50 (2006.01)

Patent

CA 2727542

Harmonics and subharmonics of acoustic measurements made during rotation of a sensor on a downhole are pro-cessed to estimate the location of the imager, and size and shape of the borehole. A piecewise elliptical fitting procedure may be used. These estimates may be used to correct measurements made by a standoff- sensitive formation evaluation sensor such as a neutron porosity tool.

Les harmoniques et les sous-harmoniques de mesures acoustiques réalisées pendant la rotation dun capteur sur un fond sont traitées pour évaluer la localisation du système imageur, ainsi que la taille et la forme du fond. Une procédure d'installation elliptique par morceaux peut être utilisée. Ces estimations peuvent être utilisées pour corriger des mesures réalisées par un capteur dévaluation de formation sensible distant, comme un outil de porosité neutronique.

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