In-situ heavy-oil reservoir evaluation with artificial...

E - Fixed Constructions – 21 – B

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E21B 47/00 (2006.01) G01V 3/00 (2006.01) G01V 3/32 (2006.01)

Patent

CA 2461995

Many reservoirs of interest include heavy oil. In such reservoirs, parti at normal temperatures, many instruments commonly used for formation evaluation may not be able to distinguish between heavy oil and bound water in the formation. Passive or active heating is used to elevate the temperature of the fluids in the formation. At elevated temperatures, distinguishing between heavy oil and bound water is easier. Of particular interest is the increase in the resolvability of the transverse relaxation time T2 of NMR spin echo measurements. Additionally, the dielectric constant and the loss tangents of water and heavy oil show different temperature and frequency dependence.

L'invention concerne de nombreux réservoirs d'intérêt contenant du pétrole lourd. Dans de tels réservoirs, à des températures normales, de nombreux instruments habituellement utilisés dans l'évaluation d'une formation ne sont pas en mesure de distinguer entre le pétrole lourd et l'eau liée dans la formation. Un système de chauffage passif ou actif est utilisé pour élever la température des fluides dans la formation. Avec des températures élevées, la distinction entre le pétrole lourd et l'eau liée est plus facile. L'augmentation de la capacité de résolution du temps de relaxation transversale T¿2? des mesures d'écho de spin NMR présente un intérêt particulier. De plus, la constante diélectrique et les tangentes de pertes d'eau et de pétrole lourd présentent une dépendance de température et de fréquence différente.

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