System and methods for formation evaluation while drilling

Details System and methods for formation evaluation while drilling System and methods for formation evaluation while drilling

G - Physics

01

V

G01V 3/00 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01)

Patent

CA 2449787

A logging while drilling (LWD) and measuring while drilling (MWD) method and device are disclosed for reducing the sensitivity of NMR measurements to tool motions. The invention is based on NMR relaxation measurements determining longitudinal relaxation times T1 instead of the standard T2 measurements, and involves saturating a relatively wide sensitive region of the formation and processing NMR echo signals which originale approximately from the center of the sensitive region. In another aspect, the invention uses novel pulse sequences and processing algorithms to reduce the time for the relaxation measurement and to provide real-time transfer of data uphole.

L'invention concerne un procédé et un dispositif de diagraphie en cours de forage et de mesure en cours de forage, servant à réduire la sensibilité de mesures par RMN aux mouvements de l'outil. Ce procédé et ce dispositif reposent sur des mesures de relaxation RMN déterminant les temps de relaxation longitudinale T1 au lieu des mesures T2 standard. Le procédé selon l'invention consiste à saturer une région sensible, relativement étendue, de la formation et à traiter les signaux d'écho RMN provenant approximativement du centre de la région sensible. Dans un autre aspect de l'invention, il est fait appel à de nouvelles séquences d'impulsions et à de nouveaux algorithmes de traitement pour réduire la durée des mesures de relaxation et pour permettre d'obtenir un transfert de données en temps réel vers le haut.

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