Evaluation of geothermal energy exploration and resource assessment. Final report. Volume II. Two phase flow in the geothermal wellbore
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 the mechanical efficiency of the two-phase flow in lifting the fluid to the surface was examined. Two well-known methods were applied to geothermal Mesa 6-1, the Hagedorn-Brown holdup correlation, and Wallis' drift flux slug flow model. Predicted mechanical efficiencies were about 30%; the actual measured efficiency is 35%. Both methods gave similar results for the overall pressure drop, but predicted opposing strategies for improving performance. The Hagedorn-Brown correlation suggests that the wellbore diameter be increased in order to reduce pressure drop, while Wallis' drift flux slug flow model suggests the opposite. The need for more data in the geothermal diameter and fluid properties range is quite apparent.
- Research Organization:
- R and D Associates, Marina del Rey, Calif. (USA)
- DOE Contract Number:
- EY-76-C-03-1269
- OSTI ID:
- 7149869
- Report Number(s):
- SAN-1269-1(Vol.2); RDA-TR-0400-002
- Country of Publication:
- United States
- Language:
- English
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