EVALUATION OF GEOTHERMAL ENERGY EXPLORATION AND RESOURCE ASSESSMENT - FINAL REPORT Volume II:Two-Phase Flow in the Geothermal Wellbore

摘要

Some of the methods available for predicting the pressure drop in a vertical two-phase flow were examined for their usefulness in analyzing the behavior of the two-phase flow in a geothermal wellbore. Previous work in this area has generally been directed toward maximizing the deliverability of the wellbore. In order to get a fresh view point we chose to examine the mechanical efficiency of the two-phase flow in lifting the fluid to the surface. We applied two well-known methods to geothermal Mesa 6-1, the Hagedorn-Brown holdup correlation, and Wallis' drift flux slug flow model. Predicted mechanical efficiencies were about 30 percent;the actual measured efficiency is 35 percent.