This paper presents a space integrated zero dimensional model that describes the thermodynamic behavior of a geothermal fracture undergoing exploitation. The main assumptions involved are: fluid and energy entering the fracture come from the surrounding matrix, fracture of infinite conductivity, and that the steam and water phases are gravitationally segregated and in thermodynamic equilibrium. The nonlinear equations of mass and energy conservation are numerically solved. A sensitivity analysis on the main parameters that affect this problem was carried out. Water recharge is described by a linear infinite aquifer, and heat flow from the matrix to the fluid was also considered by means of a linear infinite system. The behavior of the system is clearly described for conditions of exploitation in the steam, in the water, or mixed completion in both steam and water zones.

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