Stochastic nmr for downhole use

Details Stochastic nmr for downhole use Stochastic nmr for downhole use

G - Physics

01

V

G01V 3/32 (2006.01)

Patent

CA 2469891

Stochastic pulsing using random or pseudo-random sequences is used for determination of nuclear spin properties of earth formations. This reduces the power requirements. Processing of the received signals may include linear or nonlinear cross-correlation with the excitation pulse sequence. Inversion of the results of the processing gives the desired nuclear spin property.

Selon l'invention, l'impulsion stochastique effectuée au moyen de séquences aléatoires ou pseudo-aléatoires est utilisée pour déterminer des propriétés de spin nucléaire de formations terrestres. Ceci réduit les besoins en énergie. Le traitement des signaux reçus peut comprendre une corrélation croisée linéaire ou non linéaire comprenant une séquence d'impulsion d'excitation. L'inversion des résultats du traitement permet d'obtenir la propriété de spin nucléaire désirée.

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