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Environmental Earth Sciences

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01-12-2013 | Special Issue

Thermal, mechanical and chemical influences on the performance of optical fibres for distributed temperature sensing in a hot geothermal well

Authors: Thomas Reinsch, Jan Henninges, Ragnar Ásmundsson

Published in: Environmental Earth Sciences | Issue 8/2013

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Abstract

Structural well-bore integrity is an important issue for sustainable provision of geothermal energy. Raman scattering based fibre optic distributed temperature sensing (DTS) can help to monitor the status of a well and therefore help to optimize expensive work-over activities. This study reports on the installation of a fibre-optic cable in the cemented annulus behind the anchor casing in the high temperature geothermal well HE-53, Hellisheiði geothermal field, SW Iceland. Although the cable has been damaged during the installation, temperature data could be acquired during the entire length of installation down to 261.3 m. Temperature measurements were performed during the installation in spring 2009, during the onset of a flow test in summer 2009 and after a 8.5 month shut-in period in summer 2010. During the flow test, maximum temperatures of 230 °C were measured after 2 weeks fluid production. Using optical time domain reflectometry (OTDR), attenuation measurements at 850 and 1,300 nm enabled to identify mechanical, thermal, and chemical degradation along the optical fibre. The observed degradation led to erroneous temperature readings and limits, due to the optical budget of the DTS system, the accessible length of the fibre. The characteristics and the influence of the different degradation mechanisms on the accuracy of the DTS measurements are discussed and recommendations for an optimized installation are given.

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Title: Thermal, mechanical and chemical influences on the performance of optical fibres for distributed temperature sensing in a hot geothermal well
Authors: Thomas Reinsch
Jan Henninges
Ragnar Ásmundsson
Publication date: 01-12-2013
Publisher: Springer Berlin Heidelberg
Published in: Environmental Earth Sciences / Issue 8/2013
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-013-2248-8

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