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Exploration for deep enhanced geothermal systems with Riksriggen and the LTU downhole stress measurement system
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-1998-0769
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0002-9333-4477
Lund University.
2017 (engelsk)Inngår i: 4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017, European Association of Geoscientists and Engineers, 2017, s. 21-25Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
European Association of Geoscientists and Engineers, 2017. s. 21-25
HSV kategori
Forskningsprogram
Prospekteringsgeofysik; Tillämpad geokemi
Identifikatorer
URN: urn:nbn:se:ltu:diva-67330Scopus ID: 2-s2.0-85040179153ISBN: 9781510850811 (tryckt)OAI: oai:DiVA.org:ltu-67330DiVA, id: diva2:1175974
Konferanse
4th Sustainable Earth Sciences Conference and Exhibition 2017, Malmö, Sweden, 3-7 September 2017
Tilgjengelig fra: 2018-01-19 Laget: 2018-01-19 Sist oppdatert: 2018-05-24bibliografisk kontrollert

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