Evaluation of a Distributed Fiber-Optic Temperature Sensor for Logging Wellbore Temperature at the Beowawe and Dixie Valley Geothermal Fields

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Description

A distributed temperature sensor (DTS) system, utilizing Raman backscattering to measure temperatures of optical fiber, has recently been installed in production wells at the Beowawe and Dixie Valley, NV, geothermal fields. The system has the potential to reduce the cost and complexity of acquiring temperature logs. However, the optical transmission of the initial fibers installed at Beawawe degraded over several months, resulting in temperature errors. Optical transmission spectra of the failed fibers indicate hydroxide contamination via hydrogen diffusion as a possible failure mechanism. Additional fibers with coatings designed to resist hydrogen diffusion were installed and have maintained their optical transmission ... continued below

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7 p.

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Smithpeter, Colin; Norman, Randy; Krumhansl, James; Benoit, Dick & Thompson, Steve July 19, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A distributed temperature sensor (DTS) system, utilizing Raman backscattering to measure temperatures of optical fiber, has recently been installed in production wells at the Beowawe and Dixie Valley, NV, geothermal fields. The system has the potential to reduce the cost and complexity of acquiring temperature logs. However, the optical transmission of the initial fibers installed at Beawawe degraded over several months, resulting in temperature errors. Optical transmission spectra of the failed fibers indicate hydroxide contamination via hydrogen diffusion as a possible failure mechanism. Additional fibers with coatings designed to resist hydrogen diffusion were installed and have maintained their optical transmission over several months in the 340-360 F Beowawe wells. The same fibers installed in a 470 F Dixie Valley well rapidly failed. Possible methods to prevent fiber degradation include encasing the fiber in metallic buffer layer that resists hydrogen diffusion. Additional methods to correct temperature errors include using additional optical sources to measure fiber losses at the operating wavelengths. Although the DTS system is expected to have one degree F accuracy, we have observed an average accuracy of five degrees. The fiber connections appear to be the uncertainty source. Using connectors with greater stability should restore accuracy.

Physical Description

7 p.

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OSTI as DE00009585

Medium: P; Size: 7 pages

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  • Twenty-Fourth Workshop on Geothermal Reservoir Engineering, Stanford, CA (US), 01/25/1999--01/27/1999

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  • Report No.: SAND99-1820C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 9585
  • Archival Resource Key: ark:/67531/metadc794528

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  • July 19, 1999

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • April 11, 2017, 3:15 p.m.

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Smithpeter, Colin; Norman, Randy; Krumhansl, James; Benoit, Dick & Thompson, Steve. Evaluation of a Distributed Fiber-Optic Temperature Sensor for Logging Wellbore Temperature at the Beowawe and Dixie Valley Geothermal Fields, article, July 19, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc794528/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.