The report provides the chemical composition of fluids of main concern in the Hellisheiði and Nesjavellir power plants. The sampling methods, locations and sample points are described. These analyses provide a reference for further studies on materials testing and modelling along with defining the testing environment for the Geo-Coat project, as summarised in the final chapter of this report.
Reykjavik Energy operates two co-generation power plants at Nesjavellir and Hellisheiði in the flanks of the Hengill volcano in SW Iceland. The plants are fed by over 50 production wells of variable composition, temperatures and flow rates. Most of the geothermal fluid is water that is returned into the geothermal reservoirs following heat extraction. The fluids are flashed, separated, condensed and mixed at various locations in the heat extraction process with the associated risk of scaling and corrosion if proper monitoring and mitigation methods are not in place.
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