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Exploration for deep enhanced geothermal systems with Riksriggen and the LTU downhole stress measurement system
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1998-0769
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-9333-4477
Lund University.
2017 (English)In: 4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017, European Association of Geoscientists and Engineers, 2017, p. 21-25Conference paper, Published paper (Refereed)
Abstract [en]

Recent developments in drilling technology have resulted in about five to ten times faster penetration rates compared to penetration rates of conventional diamond drilling. The increased penetration rates open up for affordable drilling of deep boreholes in regions with cold crust, such as in Scandinavia, allowing for geothermal energy generation in enhanced geothermal systems. We present two infrastructures for downhole sampling and testing, Riksriggen and the LTU downhole stress measurement system. Riksriggen produces a borehole that allows in-situ sampling and testing to 2.5 km depth. Furthermore, highly relevant data for geothermal energy production is produced, for example fracture geometries and frequencies, as well as depth of zones with elevated transmissivity zones and their in-situ hydraulic conductivities. The LTU downhole stress measurement system allows determination of the three-dimensional stress tensor and its spatial variation with depth in a scientific unambiguously way. Thus, Riksriggen and the LTU downhole stress measurement system provide data needed for planning most stable borehole trajectory with depth and to determine optimal pattern of production and injection wells (e.g. hydraulic stimulation by fraccing), as well as for assessing the risk of induced seismicity.

Place, publisher, year, edition, pages
European Association of Geoscientists and Engineers, 2017. p. 21-25
National Category
Geophysics Geochemistry
Research subject
Exploration Geophysics; Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-67330Scopus ID: 2-s2.0-85040179153ISBN: 9781510850811 (print)OAI: oai:DiVA.org:ltu-67330DiVA, id: diva2:1175974
Conference
4th Sustainable Earth Sciences Conference and Exhibition 2017, Malmö, Sweden, 3-7 September 2017
Available from: 2018-01-19 Created: 2018-01-19 Last updated: 2018-05-24Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf