Calculation of current displacement efficiency and volumetric sweep efficiency based on three-dimensional reservoir simulation

This article is a continuation of works devoted to the adaptation of A.P. Krylov's formula for evaluating the effectiveness of a waterflooding system for a wide range of geological and technological conditions. The standard approach based on the reverse method of calculating the volumetric sweep efficiency according to a given constant displacement efficiency, on the one hand, does not reflect man-caused changes in the reservoir system, except displacement by water, on the other hand, due to obtaining a single integral value of the volumetric sweep efficiency, significantly narrows the possibilities of using three-dimensional reservoir models, it does not enable targeted assessment of the effectiveness of impact on the reservoir. During the development process, the volumetric sweep efficiency changes as oil is displaced and the displacement efficiency changes due to man-caused processes in the reservoir system, including as a result of oil being pushed into the contoured area or flowing into the gas cap. The application of the proposed algorithm for estimating the current values of displacement and volumetric sweep efficiency while maintaining the reservoir pressure equal to the initial based on three-dimensional reservoir modeling is presented. Using the example of a reservoir model of an oil field, differences in the values of displacement and volumetric sweep efficiency, determined by different methods, are shown.

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