The present situation of the geothermal energy developments in Japan is such that six geothermal power stations are being operated and one under construction. Although there are still many geothermal areas to be explored, it will take a long time to realize them. For such a geothermal field development, it is expected to develop a simulation model which can give rational data for planning strategies. With a view to it, the model should be able to simulate physical phenomena in the geothermal field. The system shown in this paper is composed mainly of two principal physical models; Reservoir Model and Well Model. The former is based on the mathematical description of fluid flow through porous media and the latter through vertical pipes. The final purpose of this study is to develop simulation models for optimizing the scheme of geothermal field development.

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