Method and apparatus for determining formation resistivity...

Details Method and apparatus for determining formation resistivity... Method and apparatus for determining formation resistivity...

G - Physics

01

V

G01V 3/20 (2006.01) E21B 10/00 (2006.01) E21B 47/02 (2006.01)

Patent

CA 2648698

A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses the drillbit and the adjacent portion of the drill collar as a focusing electrode for focusing the measure current from a measure electrode on the face or side of the drillbit. This provides the ability to see ahead of and azimuthally around the drillbit.

Procédé et dispositif d'obtention d'une mesure de résistivité dans une formation terrestre autour trou de forage dans un dispositif de mesure de fond pendant le forage (MWD), Ce procédé fait intervenir l'outil de forage et la partie adjacente de la masse-tige comme électrode de focalisation pour focaliser le courant de mesure émanant d'une électrode de mesure sur la face ou sur le côté de l'outil de forage. Il est ainsi possible de voir en aval et azimutalement autour de l'outil de forage.

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