坑井近傍貯留層内および坑井内の流体流動を推算するシミュレータ(WELCARD-V)の開発
地熱井近傍貯留層内における液単相および気液二相の定常非ダルシー流の推算方法の検討
1999 年 21 巻 4 号 p. 341-352
詳細
1999 年 21 巻 4 号 p. 341-352
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.
