Experimental testing of
Hellisheiði Geothermal Field, Iceland
- Embedded distributed sensing in an harsh environment
- Extreme distributed temperature (300 °C) and strain (3.3 mm/m) sensing
- Unique implementation strategy and structure-adhesive-fiber composite
We investigated the possibility to embed sensing fibers to a 9 5/8" production casing pipe for DTS and DSS. The aforementioned casing pipe was later cemented into a 13 3/4" casing and heated up to 280 °C. The aim of this project was to measure the mechanical behavior of a newly developed construction piece for medium- to high-enthalpy geothermal wells - a so called "flexible coupling". With our specially developed implementation strategy, we can measure temperatures up to 300 °C and deformations of 3.3 mm/m with a spatial resolution of 0.5 m.
FundingThis work was financed by the GeConnect project (Geothermal Casing Connections for Axial Stress Mitigation), coordinated by ÍSOR, which is funded through the ERANET cofund GEOTHERMICA (Project no. 731117), from the European Commission, Technology Development Fund (Iceland), Bundesministerium für Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages (Germany) and Ministerie van Economische Zaken (The Netherlands).
ReferencesKaldal, G. S., Thorbjornsson, I., Guðmundsson, L., Reinsch, T., Lipus, M., Wollenweber, J., & Sverrisson, Ó. (2019). Full-scale Surface Experiment of Cemented-in Casing Connections Designed for Thermal Stress Mitigation. European Geothermal Congress.(open access link)
Lipus, M., Kaldal, G.S., Eggertsson, G.H., Reinsch, T., Wildenborg, T., Wollenweber, J., Demusson, V., Pálsson, B. & Sverrisson, Ó. (2022). Full-scale thermal cycle testing of innovative high-temperature casing connections ("flexible couplings"), European Geothermal Congress (extended abstract) .
Field testing site - Hveragerði, Iceland
Fiber preparation under harsh condition
Fiber field implementation and inspection