Subsystem Design and Validation for Optical Sensors for Monitoring Enhanced Geothermal Systems
- Key words
- geothermal, optical fiber, pressure sensor,MEMS
- Conference
- Stanford Geothermal Workshop
- Year
- 2011
- Session
- Emerging Technology
- Language
- English
- Paper number
- Knobloch
Full text
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Abstract
A multidisciplinary team, consisting of participants from GE, Qorex LLC, AFL Telecommunications and Sandia National Labs, is engaged in a DoE-sponsored program to develop an optical sensor suite for the measurement of distributed temperature and pressure in geothermal wells. Our effort in the first year has been focused on the development and validation of specific sub-systems including both fiber and sensors to show the reliability of the sensing approach for temperatures up to 374 C and pressures of 220 bars in the presence of hydrogen. This paper discusses the overall program scope and presents some initial results from three key tasks, point pressure sensor development, fiber Bragg grating pressure sensor development, and fiber tensile strength testing at elevated temperatures.
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