Method for formation evaluation while drilling

Details Method for formation evaluation while drilling Method for formation evaluation while drilling

G - Physics

01

R

G01R 33/44 (2006.01) G01V 3/00 (2006.01) G01V 3/32 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2276426

A logging while drilling (LWD) and measuring while drilling (MWD) method and device (16) are disclosed for reducing the sensitivity of NMR measurements to tool (16) motions. The invention is based on NMR relaxation measurements determining longitudinal relaxation times T1 instead of standard T2 measurements, and involves saturating a relatively wide sensitive region of the formation (10) and processing NMR echo signals which originate approximately from the center of the sensitive region.

L'invention concerne un procédé et un dispositif (16) de diagraphie en cours de forage (LWD) et de mesure en cours de forage (MWD), destinés à réduire la sensibilité des mesures RMN aux mouvements des outils de forage (16). L'invention se fonde sur les mesures RMN de relaxation déterminant les temps T1 de relaxation longitudinale, au lieu de se fonder sur des mesures standards T2, et suppose la saturation d'une région sensible relativement étendue de la formation (10) et le traitement de signaux d'écho RMN naissant, approximativement, au centre de la région sensible.

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