Authors: Artem Alexeev Alexander Shapiro Kaj Thomsen
Publish Date: 2014/11/14
Volume: 106, Issue: 3, Pages: 545-562
Abstract
Physicochemical interactions between the fluid and reservoir rock due to the presence of active components in the injected brine produce changes within the reservoir and can significantly impact the fluid flow We have developed a 1D numerical model for waterflooding accounting for dissolution and precipitation of the components Extending previous studies we consider an arbitrary chemical nonequilibrium reactioninduced dissolution We account for different individual volumes that a component has when precipitated or dissolved This volume nonadditivity also affects the pressure and the flow rate An equation of state is used to account for brine density variation with regard to pressure and composition We present a numerical study of the evolution of the reservoir parameters in the framework of the developed model It is demonstrated that the systems characterized by large Damkohler numbers fast reaction rates may exhibit rapid increase of porosity and permeability near the inlet probably indicating a formation of high permeable channels wormholes Water saturation in the zone of dissolution increases due to an increase in the bulk volume accessible for the injected fluid Volumetric nonadditivity is found to be responsible for insignificant change in the velocity of the displacement front
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