Abstract
A numerical model for a vertical two-phase flow in a geothermal well developed based on Ramirez's algorithm (1983) was applied to the data analysis of a certain well in the Sumikawa geothermal field and its applicability was discussed. It was concluded that the numerical model could simulate vertical two-phase fluid flow phenomena that could be considered as steady state. From the analysis of a certain well, following couclusions were also obtained. (1) There were two feed points in the analyzed well and they interfered each other. (2) The fluid at feed points of the analyzed well was already in two-phase. (3) It was estimated that approximately 80 percent of fluids was supplied from a deeper feed point during the interval that could be considered as steady state.
