Downhole Enthalpy Measurement in Geothermal Wells with Fiber Optics
Abstract/Contents
- Abstract
- Studies investigating ways to measure enthalpy downhole have been in progress at Stanford University for the last three years. So far, the void fraction and the dispersed phase velocity, which are the two essential factors required for calculation of flowing enthalpy, have been determined by using resistivity and photo-sensors. Currently, research efforts have been oriented toward measuring downhole enthalpy by fiber optics. The normal reflection probe with the tip surface cut at a right angle to the fiber axis was used to investigate the void fraction first in water-air flow then in water-steam flow. A 4- inch tall plexiglass tube was used in the experiments. The comparison measurements for void fraction were made by using the fractional flow ratio detector (FFRD). Successful results were obtained for the slow bubble flow case and water-steam flow. After void fraction measurements, a new probe with two fibers of different lengths was designed for the dispersed phase velocity measurement. The dispersed phase velocity values obtained from the fiber probe showed good agreement with the values measured by using a video camera. After obtaining satisfactory results in the 4-inch tube, we tested our device in a 6.5-foot model wellbore and comparison measurements for void fraction were made using a resistivity sensor. The results were in good agreement. It was observed that the correlation between resistivity sensor and fiber optic sensor increased with increasing air flow rates.
Description
| Type of resource | text |
|---|---|
| Date created | June 2008 |
Creators/Contributors
| Author | Atalay, Nilufer |
|---|---|
| Primary advisor | Horne, Roland N. |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Atalay, Nilufer. (2008). Downhole Enthalpy Measurement in Geothermal Wells with Fiber Optics. Stanford Digital Repository. Available at: https://purl.stanford.edu/nn591cb6430
Collection
Master's Theses, Doerr School of Sustainability
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