The frontal mathematical model of water-steam phase transition with capillary forces within porous media is proposed. The complete system of boundary conditions at the boiling front is presented. Similarity analytical solution is derived for the one-dimensional problem of mass extraction from a contact boundary between a hydrothermal reservoir and impermeable rocks. It is shown that two different regimes of water vaporization exist: 1) with formation of a two-phase transition zone and 2) with formation of a sharp vaporization front within nonwetting porous media. The effects of capillary forces on the main characteristics of the vaporization process are investigated.

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