Thermal Stability of Fluorescent Dyes as Geothermal Tracers
Abstract/Contents
- Abstract
- This work attempted to determine the effect of temperature on the fluorescence of rhodamine WT and fluorescein. 200 ppb solutions of rhodamine WT and 50 ppm solutions of fluorescein were subjected to 100, 150 and 200C temperatures for a variable length of time. Reduction in relative fluorescence occurred in solutions of both rhodamine WT and fluorescein at all temperatures.The reduction in fluorescence is approximately a first-order reaction. It is most severe at 200C. Rhodamine WT is more stable than fluorescein. Rhodamine WT solutions reached 50% relative fluorescence at 200C within 40 hours. After 150 hours, rhodamine WT becomes inactive at 200C. However, at 150C, the 50% relative fluorescence is reached after 250 hours. Rhodamine WT solutions reached 50% relative fluorescence after about 2000 hours at 100C. Fluorescein solution lost its fluorescence after about three hours at 200C. The relative fluorescence of fluorescein reached 50% after about 20 and 150 hours at 150 and 100C respectively. Hence, rhodamine WT can be used with confidence as a tracer in systems whose temperature is around 150C. Rhodamine WT can also be used at 200C in fractured geothermal reservoirs that admit short residence time. Fluorescein should be limited to low temperature systems, preferably around 100C.
Description
| Type of resource | text |
|---|---|
| Date created | December 1986 |
Creators/Contributors
| Author | Al-Riyami, Yahrib M. |
|---|---|
| Primary advisor | Gudmundsson, Jon |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Al-Riyami, Yahrib M. (1986). Thermal Stability of Fluorescent Dyes as Geothermal Tracers. Stanford Digital Repository. Available at: https://purl.stanford.edu/tz787gy7414
Collection
Master's Theses, Doerr School of Sustainability
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