METHOD OF MODELLING THE PRODUCTION OF HYDROCARBONS BY A SUBSURFACE DEPOSIT WHICH ARE SUBJECT TO DEPLETION

摘要

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.