Experimental testing of
high-temperature casing

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.


This 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).

Field testing site - Hveragerði, Iceland
Fiber preparation under harsh condition
Fiber inspection
Laboratory testing
Fiber field implementation and inspection