Abstract
In this paper, calculation methods of single-phase and two-phase flows in the reservoir around the geothermal well have been discussed. In case of single-phase flow, the accuracy of the calculation method based on Forchheimer's equation is higher than the method based on Darcy's law. In twophase flow, the accuracy of a calculation method based on expanded Forchheimer's equation is also higher than the method based on Darcy's law. The methods based on Forchheimer's equation have been incorporated into a wellbore flow simulator WELCARD-IV, then a flow simulator WELCARD-V which can analyze a flow system connecting the reservoir around the geothermal well with the well-bore has been developed. When calculating the inflow performance, WELCARD-V has the advantages as follows:(1) Density and viscosity of fluid in the reservoir are not needed.(2) Relative permeability and reservoir temperature are not needed in case of two-phase flow.
