This paper describes a model for numerically simulating themal recovery processes, The primary focus is on the simulation of in-situ combustion, but the formulation also represents /ire-and-water flooding, steam/looding, hot water flooding, steam stimulation, and spontaneous ignition as well. The simu Iator describes the flow of water, oil, and gas, and includes gravity and capillary effects. Heat tran.r/er by conduction, convection, and vaporization-conden~a~ion of both water and hydrocarbons are included. The rigorous but general nature of the simulator is obtained by employing conservation balance equations for . oxygen, inert gases, a Iigbt hydrocarbon pseudocomponent, a heavy hydrocarbon. pseudo component, water, coke, and energy. Vaporization-condensation is governed by vaporliquid equilibrium using temperature and pressure-dependent equilibrium coefficients. Four chemical reactions are -accounted for: formation of coke from the heavy hydroctirbon component and the oxidation of coke and botb heavy and light hydrocarbon components. Formulation details, numerical solution procedures, and computational results are pr~sented. The computational results include both one-and two-dimensional cross-sectional studies. The simulator represents a major improvement in the ability to simulate thermal recovery processes urder complex conditions. P G9 P Cw %? %? Sw Sw Pg, T, Y5
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