Method of modelling the production of hydrocarbons by a...

E - Fixed Constructions – 21 – B

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E21B 44/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2479361

The invention relates to a method of modelling the production of hydrocarbons comprising, for example, relatively-high-viscosity oils. According to the invention, measurements are taken in the laboratory of the respective volumes of oil and gas produced by rock samples from the deposit and the relative permeabilities (Kr) of the rock samples with regard to hydrocarbons. A gas fraction formation and flow model is used to determine a volume transfer coefficient (hv) by means of an empirical function which represents the distribution of nuclei that can be activated at a pressure P (function N(P)) which is set with reference to the preceding measurements. Assuming that the distribution of nuclei N(P) in the rocks of the deposit is the same as the distribution measured in the laboratory, the gas fraction formation and flow model is used to determine the numerical transfer coefficient which corresponds to same inside the deposit at selected depletion rates. In this way, the relative permeabilities can be predicted.

Méthode pour modéliser la production d'hydrocarbures comprenant notamment des huiles à viscosité relativement forte. A partir de mesures en laboratoire des volumes respectifs d'huile et de gaz produits par des échantillons de roche provenant du gisement ainsi que des perméabilités relatives (Kr) d'échantillons de roche relativement aux hydrocarbures, on utilise un modèle de formation et d'écoulement de la fraction gazeuse, pour déterminer un coefficient de transfert volumique (hv) par le biais d'une fonction empirique qui représente la distribution de germes pouvant être activés à une pression P (fonction N(P)) qui est calée par référence aux mesures précédentes. En considérant que la distribution de germes N(P) dans les roches du gisement est la même que la distribution mesurée au laboratoire, on détermine par utilisation du modèle de formation et d'écoulement de la fraction gazeuse, le coefficient de transfert numérique qui lui correspond à l'intérieur du gisement à des taux de déplétion choisis, ce qui permet de prédire les perméabilités relatives.

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