Soft stimulation treatment of geothermal well RV-43 to meet the growing heat demand of Reykjavik
Por:
Hofmann H., Zimmermann G., Huenges E., Regenspurg S., Aldaz S., Milkereit C., Heimann S., Dahm T., Zang A., Grigoli F., Karvounis D., Broccardo M., Wiemer S., Hjörleifsdóttir V., Kristjánsson B.R., Hersir G.P., Ásgeirsdóttir R.S., Magnússon R., Árnadóttir S.
Publicada:
1 ene 2021
Resumen:
Reykjavik is almost entirely heated by geothermal energy. Yet, recent growth of the city significantly increased the heat demand. Past experiences in Iceland's capital region showed that hydraulic stimulation of existing geothermal wells is suited to improve hydraulic performance and energy supply. However, fluid injection may also trigger felt or even damaging earthquakes, which are of concern in populated areas and pose a significant risk to stimulation operations. Consequently, soft stimulation concepts have been developed to increase geothermal well performance while minimizing environmental effects such as induced seismicity. In a demonstration project of hydraulic soft stimulation in October 2019, more than 20.000 m³ of water were injected into well RV-43 in Reykjavik in multiple stages and with different injection schemes. The hydraulic performance of the well was improved without inducing felt seismicity. An a priori seismic risk assessment was conducted and for the first time the risk was continuously updated by an adaptive traffic light system supported by a sophisticated realtime microseismic monitoring. Our results confirm that it is possible to improve the performance of geothermal wells in Reykjavik and worldwide with acceptable technical, economic, and environmental risks. Here we provide an overview of the entire stimulation project including site description, stimulation design, zonal isolation, logging, seismic risk assessment and mitigation measures, realtime seismic, hydraulic and chemical monitoring, and stimulation results and challenges. © 2021
Filiaciones:
Hofmann H.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Zimmermann G.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Huenges E.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Regenspurg S.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Aldaz S.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Milkereit C.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Heimann S.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
Dahm T.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
University of Potsdam, Am Neuen Palais 10, Potsdam, 14469, Germany
Zang A.:
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, TelegrafenbergPotsdam 14473, Germany
University of Potsdam, Am Neuen Palais 10, Potsdam, 14469, Germany
Grigoli F.:
Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland
University of Pisa, Via Santa Maria 53, Pisa, 56126, Italy
Karvounis D.:
Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland
Broccardo M.:
Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland
University of Trento, Via Mesiano 77, Trento, 38123, Italy
Wiemer S.:
Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland
Hjörleifsdóttir V.:
Reykjavik Energy, Bæjarháls 1, Reykjavík, 110, Iceland
Kristjánsson B.R.:
Reykjavik Energy, Bæjarháls 1, Reykjavík, 110, Iceland
Hersir G.P.:
Iceland Geosurvey (ÍSOR), Grensásvegi 9, Reykjavík, 108, Iceland
Ásgeirsdóttir R.S.:
Iceland Geosurvey (ÍSOR), Grensásvegi 9, Reykjavík, 108, Iceland
Magnússon R.:
Iceland Geosurvey (ÍSOR), Grensásvegi 9, Reykjavík, 108, Iceland
Árnadóttir S.:
Iceland Geosurvey (ÍSOR), Grensásvegi 9, Reykjavík, 108, Iceland
All Open Access, Hybrid Gold
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