Alexander Richter, Think Geoenergy
Strada Energy drilling rig on project site in Finland (source: Strada Energy Investor Presentation)
Summary
In a release today, Finnish energy company St1 has announced that its project to build Finland’s first industrial scale emission-free geothermal energy heating plant has now progressed to the stimulation stage. The pilot project is seeking to extract bedrock heat for use in district heating by drilling two boreholes to a depth of several kilometres. Water will be pumped down one of these boreholes for underground geothermal heating, with the resulting hot water then extracted via the other borehole. The heating plant will feed this heat into the local district heating network. The stimulation stage will study the flow of this borehole water through rock fissures at a depth of more than six kilometres underground.
St1 began drilling the boreholes for the pilot heating plant at Otaniemi in spring 2016. Air hammer technology was initially used for drilling to a depth of 4.5 kilometres. Drilling of the first borehole into the hard bedrock of Finland then continued using an optimised combination of water hammer and conventional drilling technology to reach a depth of more than 6 kilometres.
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