Multiphase flows of a binary mixture in a porous media subjected to wide-range variations of pressure and temperature are studied, describing real properties of the mixture. A new method is proposed for the simulation of single-phase, two-phase and three-phase flows of a mixture under sub- and supercritical thermodynamic conditions. The hydrodynamics of the filtration process greatly depends on the phase diagram of the mixture. A phase diagram of the water - carbon dioxide mixture is studied in detail. Flows accompanying natural processes in a geothermal reservoir, underground carbon dioxide liquefaction and retrograde condensation in the process of gas condensate formation are considered within in the framework of the proposed method.
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