A method and apparatus for differentiating oil based mud...

G - Physics – 01 – V

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G01V 3/32 (2006.01)

Patent

CA 2339801

A method and apparatus for processing nuclear magnetic resonance information (76) to differentiate between oil based mud filtrate (OBM), and connate oils, during subsurface explo-ration. An NMR experiment is performed on a sample (70) of formation fluid, and the resulting data is processed to differen-tiate the relaxation parameters (80) characteristic of OBMs and those characteristic of connate oils. A simple arithmetic dif-ference (84) between relaxation times calculated for successive samples may be followed by a distribution analysis performed in either the time domain or relaxation spectrum domain (86, 94).

L'invention concerne un procédé et un appareil de traitement de données (76) de résonance magnétique nucléaire pour établir une différence entre un filtrat de boue à base d'huile et des huiles fossiles lors d'une exploration souterraine. On réalise une expérience de résonance magnétique nucléaire sur un échantillon (70) de fluide de formation et on traite les données obtenues pour établir une différence entre les paramètres (80) de relaxation caractéristiques des filtrats de boue à base d'huile et ceux caractéristiques des huiles fossiles. Une simple différence (84) arithmétique entre des temps de relaxation calculés pour des échantillons successifs peut être suivie d'une analyse de répartition effectuée dans le domaine temporel ou dans le domaine (86, 94) du spectre de relaxation.

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