We use two- and three-dimensional, fractal and non-fractal networks of interconnected fractures as models of a fractured geothermal field, and study two-phase flow and heat-transfer in such a system. We show that a fractal fracture network is much more efficient than a non-fractal network in heat recovery from a hot matrix. Moreover, the efficiency of a geothermal reservoir is very sensitive to its structure and the location of the producing well, and there may be an optimum configuration of the producing and injection wells for extracting heat and vapor from the reservoir.

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