Abstract
Abstract Numerical simulation of pressure-transient tests in complex reservoirs is a growing interest topic in Reservoir Engineering. The aim of this paper is to build interpretation tools for synthetic well-tests in such geometries when classical analytical models are not applicable. An approach based on moments is proposed. It consists in the evaluation of the time-variations of simple spatial global properties of the simulated pressure-field. It provides at a negligible extra CPU cost a precise evaluation of the size of the drainage zone, as well as an alternative very simple determination of the reservoir equivalent porosity and permeability. It avoids a rather imprecise Log (t) interpretation, gives the main time-scales and lengthscales of interest and the occurence of reservoir-boundary effects. Such an approach is a first step toward an integrated interpretation of well-tests in complex reservoirs linked to a reservoir simulator. Simple mathematical elements, as well as numerical and practical examples of its use over geostatistically generated reservoirs are given.
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