Use of Naturally-Occurring Tracers to Monitor Two-Phase Conditions in the Coso EGS Project
- Key words
- tracers, two-phase, COSO
- Location
- Coso, California
- Conference
- Stanford Geothermal Workshop
- Year
- 2004
- Session
- FIELD STUDIES
- Language
- English
Full text
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Abstract
A dramatic decrease in the ratio of chloride to boron was observed in the liquid discharge of a well proposed for EGS development in the Coso geothermal field. The decrease appears to be related to the transformation of some feed zones in the well from liquid-dominated to vapor-dominated. High concentrations of boron are transported to the wellbore in the steam, where it fractionates to the liquid phase flowing in from liquid-dominated feed zones. The high-boron steam is created when the reservoir liquid in some of the feed zones boils with a steam fraction greater than 90%. Combination of boron from both phases into the liquid phase results in the Cl;B ratio dropping from 40 to as low as 20.
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