Abstract
ABSTRACT In this paper, we study fluid displacements in layered porous media and focus particularly on the effects of viscous instability and of capillarity. We first present several series of experiments of miscible and immiscible displacements in a three-layer cell with two different permeabilities. We cover a large range of viscosity ratios in the two cases of unstable and stable miscible displacements. The fluid boundaries are followed by visualizations and quantitative saturation data obtained by ultrasonic mapping. The second part of the paper is devoted to the description of a pore network simulator and a stochastic model which are suitable for describing viscous instability. Both models not only reproduce the experimental patterns very closely but are also in good quantitative agreement with experimental data for the ratio of the volumes of fluid injected in the two different layers.
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