The phase fluxes and component movement within the reservoir are greatly affected by phase behavior (e.g., the mobility of each phase and which components are carried in each phase). A grid cell’s overall composition changes because of cell-to-cell fluxes and because of production or injection in wells. Modern reservoir simulators are usually written with a general compositional formulation, whereas black-oil PVT properties are converted internally to a two-component "compositional" model the two components are surface gas and surface oil.Ī reservoir simulator keeps track of overall composition in each computational grid cell as a function of time. With either approach, the PVT quantities required by a reservoir simulator are essentially the same. Using a "compositional" approach based on a thermodynamically-consistent model such as a cubic equation of state (EOS). Using a "black-oil" approach based on simple interpolation of PVT properties as a function of pressure.The calculation of phase behavior in a reservoir model can be made in one of the two following ways:
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