Non-isothermal compositional gas flow during carbon dioxide storage and enhanced gas recovery

In this work we present the conceptual modeling and the numerical scheme for carbon dioxide storage into nearly depleted gas reservoirs for enhanced gas recovery reasons. For this we develop non-isothermal compositional gas flow model. We used a combined monolithic / staggered coupling scheme to solve mass balance equation for the gaseous mixture with heat and fractional mass transport equations. Temperature change resulting from fluid expansion and viscous heat dissipation is included in heat transport in addition to advection and conduction. We have used a modified version of the Peng- Robinson equations of state, to determine the density of the real gas mixture along with an empirically extended ideal gas equation. A real behavior of mixture is accounted by using energy and distance parameters