Azimuthal nmr imaging of formation properties from a wellbore

G - Physics – 01 – V

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G01V 3/32 (2006.01) F16P 3/14 (2006.01) G01R 33/44 (2006.01) G01R 33/483 (2006.01)

Patent

CA 2506752

A method and apparatus for performing NMR measurements suppressing contribution to NMR signals from within the borehole. Within the region of examination, the RF magnetic field has a spatially varying intensity. NMR signals (free induction decay or spin echo signals) are inverted to give spin density as a function of field intensity. This inversion is then mapped to spatial positions using the known RF field variation. The effect of signals arising from within the borehole can be suppressed. It is also possible to obtain an azimuthal image of the spin density.

L'invention concerne un procédé et un dispositif permettant d'effectuer des mesures par RMN en éliminant les contributions aux signaux de RMN provenant de l'intérieur du trou de forage. Dans la zone étudiée, le champ magnétique HF présente une intensité variable dans l'espace. Le procédé décrit consiste à inverser les signaux de RMN (signaux de précession libre ou d'écho de spin) de manière à obtenir la densité de spin en tant que fonction de l'intensité du champ, puis à mettre cette inversion en correspondance avec des positions spatiales en utilisant la variation connue du champ HF. Ce procédé permet ainsi de supprimer les effets des signaux provenant de l'intérieur du trou de forage. Il permet en outre de produire une image azimutale de la densité de spin.

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