The Horizon 2020 Project SURE: Deliverable 6.3 - Report on field scale RJD stimulation for the magmatic site

• Main Authors: Skúlason Kaldal, Gunnar, Thorbjörnsson, Ingolfur, Gautason, Bjarni, Árnadóttir, Sigurveig, Einarsson, Gunnlaugur M., Egilsson, Thorsteinn, Ásgeirsdóttir, Ragnheiður S., Kästner, Felix, Thorsteinsdóttir, Unnur, Erlendsson, Ögmundur, Vilhjálmsson, Arnar Már, Tryggvason, Hörður, Haraldsdóttir , Svanbjörg Helga
• Format: Report
• Language: English
• Published: GFZ German Research Centre for Geosciences 2019
• Subjects: Akureyri; Iceland
• Online Access: https://dx.doi.org/10.2312/gfz.4.8.2019.013; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002030

This report describes activity connected to radial jet drilling (RJD) in Iceland in WP6 – Macro Scale in the SURE project. Well HN-13, located in N-Iceland close to the town of Akureyri was selected as a candidate for RJD trials within the SURE project. It was drilled in between two prior drilled low-temperature geothermal wells, HG-10 (a.k.a. HN-10) and BO-01 (a.k.a. BN-01), that are both productive and used for district heating of Akureyri and nearby communities. Although the location was in between two producing wells, it was a poor producer only producing 5-6 liters per minute (0,1 l/s) while being air lifted. For comparison, the mean production from well HG-10 that sits 20 m NNE of HN-13, is about 25 l/s of 90°C hot water. HN-13 was therefore valued as an excellent candidate for demonstration of the stimulation technology, as any increased production after RJD will clearly be revealed. Jetting experiments in WP5 into basalt rock types sent from Iceland to Bochum were shown to be impractical as high pressure and velocities are required. Therefore, softer inter-basaltic layers were targeted. Main information on well HN-13, nearby wells, target depth as well as the RJD field testing are described in this report.