Mathematical study of a petroleum-engineering scheme

Eymard, Robert; Herbin, Raphaèle; Michel, Anthony

ESAIM: Modélisation mathématique et analyse numérique, Tome 37 (2003) no. 6, pp. 937-972.

Models of two phase flows in porous media, used in petroleum engineering, lead to a system of two coupled equations with elliptic and parabolic degenerate terms, and two unknowns, the saturation and the pressure. For the purpose of their approximation, a coupled scheme, consisting in a finite volume method together with a phase-by-phase upstream weighting scheme, is used in the industrial setting. This paper presents a mathematical analysis of this coupled scheme, first showing that it satisfies some a priori estimates: the saturation is shown to remain in a fixed interval, and a discrete $L^2(0,T;H^1\left(Ø\right))$ estimate is proved for both the pressure and a function of the saturation. Thanks to these properties, a subsequence of the sequence of approximate solutions is shown to converge to a weak solution of the continuous equations as the size of the discretization tends to zero.

Classification : 35K65, 76S05, 65M12
Mots clés : multiphase flow, Darcy's law, porous media, finite volume scheme

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