Method for evaluating capillary pressure curve of an...

G - Physics – 01 – N

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G01N 15/08 (2006.01) G01N 7/04 (2006.01) G01N 33/24 (2006.01)

Patent

CA 2482751

The invention concerns a method for evaluating the capillary pressure curve of an underground deposit rocks based on measurements of rock cuttings or fragments such as drill cuttings derived therefrom, over the entire saturation interval of said rocks, in reduced time and at less cost based on said measurements. The method essentially consists in: measuring the permeability k of the rock cuttings, measuring the capillary pressure curve Pc based on the saturation of said fragments initially saturated with a fluid (for example brine) by subjecting them to centrifuging, and parameterizing a capillary pressure curve Pc satisfying empirical relationships depending on adjustable parameters, which are constrained to be adjusted to an asymptotic portion of the capillary curve measured by centrifuging, and to the value of permeability measured on the drill cuttings, so as to obtain the complete capillary pressure curve. The invention is applicable to evaluation of a hydrocarbon deposit for example.

Méthode d'évaluation de la courbe de pression capillaire de roches d'un gisement souterrain à partir de mesures sur des débris ou fragments de roche tels que des débris de forage qui en proviennent, sur tout l'intervalle de saturation de ces roches, ceci dans un délai réduit et à moindre coût à partir de ces mesures. Elle comporte essentiellement une mesure de la perméabilité k des débris de roche, une mesure de la courbe de pression capillaire Pc en fonction de la saturation de ces fragments initialement saturés d'un fluide (de la saumure par exemple) en les soumettant à une centrifugation, et le paramétrage d'une courbe de pression capillaire Pc satisfaisant à des relations empiriques dépendant de paramètres ajustables, que l'on contraint à s'ajuster à une partie asymptotique de la courbe capillaire mesurée par centrifugation, et à la valeur de la perméabilité k mesurée sur les débris de forage, de façon à obtenir l'ensemble de la courbe de pression capillaire. Applications à l'évaluation d'un gisement en hydrocarbures par exemple.

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