NONISOTHERMAL MULTIPHASE FLOW OF BRINE AND GAS THROUGH SALINE MEDIA

We propose a general formulation for nonisothermal multiphase flow of brine and gas through saline media. The balance equations include mass balance (three species), equilibrium of stresses and energy balance ( total internal energy). Salt, water and air mass balance equations are established. The balance of salt allows the establishment of the equa tion for porosity evolution due to solid skeleton deformation, dissolu tion/precipitation of salt and migration of brine inclusions. Water an d air mass balance equations are also obtained. Two equations are requ ired for water: total water in the medium and water present in solid p hase brine inclusions. The mechanical problem is formulated through th e equation of stress equilibrium. Finally, the balance of internal ene rgy is established assuming thermal equilibrium between phases. Some g eneral aspects of the constitutive theory are also presented.