Automatic adjustment of nmr pulse sequence to optimize snr...

Details Automatic adjustment of nmr pulse sequence to optimize snr... Automatic adjustment of nmr pulse sequence to optimize snr...

E - Fixed Constructions

21

B

E21B 47/00 (2006.01)

Patent

CA 2614216

A method of conducting logging operations of a borehole in an earth formation comprises making measurements using a nuclear magnetic resonance (NMR) sensor in the borehole, determining, from the measurements, a fraction of at least one sensitive volume of the NMR sensor that includes a borehole fluid, and altering the at least one sensitive volume based on the determination.

L'invention concerne des données provenant d'une chaîne de plusieurs capteurs de données d'évaluation d'une formation, qui sont évaluées par un système expert. Sur la base de l'analyse, on accélère la vitesse de diagraphie si tous les capteurs le justifient, et on la ralentit si l'un ou l'autre des capteurs exige une vitesse de diagraphie réduite. Autre variante, le volume sensible d'un capteur NMR est modifié sur la base d'une détermination d'une fraction du volume sensible qui comporte un liquide de puits de forage.

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