Exploration for deep enhanced geothermal systems with Riksriggen and the LTU downhole stress measurement system
(2017) 4th Sustainable Earth Sciences Conference and Exhibition 2017 p.21-25- Abstract
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... (More)
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.
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- author
- Ask, M. ; Ask, D. and Rosberg, J. E. LU
- organization
- publishing date
- 2017
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- 4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017
- pages
- 5 pages
- publisher
- European Association of Geoscientists and Engineers
- conference name
- 4th Sustainable Earth Sciences Conference and Exhibition 2017
- conference location
- Malmo, Sweden
- conference dates
- 2017-09-03 - 2017-09-07
- external identifiers
-
- scopus:85040179153
- ISBN
- 9781510850811
- language
- English
- LU publication?
- yes
- id
- 4eefa9b6-be2e-4909-9269-c62e99273229
- date added to LUP
- 2018-01-15 10:56:09
- date last changed
- 2025-01-08 03:28:13
@inproceedings{4eefa9b6-be2e-4909-9269-c62e99273229,
abstract = {{<p>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.</p>}},
author = {{Ask, M. and Ask, D. and Rosberg, J. E.}},
booktitle = {{4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017}},
isbn = {{9781510850811}},
language = {{eng}},
pages = {{21--25}},
publisher = {{European Association of Geoscientists and Engineers}},
title = {{Exploration for deep enhanced geothermal systems with Riksriggen and the LTU downhole stress measurement system}},
year = {{2017}},
}