Multi frequency focusing for mwd resistivity tools

Details Multi frequency focusing for mwd resistivity tools Multi frequency focusing for mwd resistivity tools

G - Physics

01

V

G01V 3/28 (2006.01)

Patent

CA 2578985

An induction logging tool is used on a MWD bottom hole assembly. Due to the finite, nonzero, conductivity of the mandrel, conventional multi frequency focusing (MFF) does not work. A correction is made to the induction logging data to give measurements simulating a perfectly conducting mandrel. MFF can then be applied to the corrected data to give formation resistivities.

L'invention concerne un outil de diagraphie d'induction utilisé sur un ensemble fond de trou MWD. En raison de la conductivité finie, non nulle du mandrin, la concentration multifréquence classique (MFF) ne convient pas. Une correction est appliquée aux données de diagraphie d'induction pour fournir des mesures simulant un mandrin parfaitement conducteur. La MFF peut ensuite être appliquée aux données corrigées pour obtenir les facteurs de formation.

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