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Phase Behavior Simulation With Dynamic Multicomponent Adsorption

In ultra-low-permeability reservoirs, like shale rocks, adsorption has a strong effect on hydrocarbons in place and production dynamics. Experimental studies show that adsorption can have significant influence on mixture composition and phase envelope.
However, modeling the effect of adsorption on dynamic changes in mixture composition was not given much attention previously. The most comprehensive studies considered adsorption impact on effective pore radii through formation of adsorption films, which resulted in minor changes of capillary pressure. Thus, the influence of adsorption on phase behavior was found almost negligible.
In the present study we introduce a method to account for dynamic adsorption/desorption of components while modeling phase behavior of a hydrocarbon mixture. The iterative method uses a multicomponent adsorption model to compute adsorbed amounts of components and correct mixture composition within phase equilibrium calculations. The method deals with actual parameters of adsorbent, thermodynamic conditions and properties of the reservoir.
Examples of phase behavior calculations with multicomponent adsorption/desorption for hydrocarbon reservoirs with different properties are presented. It is shown that neglecting the dynamic desorption impact on mixture composition for (ultra) low-permeability reservoirs may lead to dramatic errors in prediction of phase fractions and compositions, which is important for PVT- and compositional flow simulations.