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 2506170

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 dispositif de fond MWD. Etant donné la conductivité finie non nulle du mandrin, la focalisation multifréquence (MFF) classique ne fonctionne pas. On réalise une correction sur les données de diagraphie d'induction en vue d'obtenir des mesures simulant un mandrin parfaitement conducteur. Les données corrigées peuvent ensuite être soumises à une MFF permettant d'obtenir les résistivités d'une formation terrestre.

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