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Heterogeneity preserving upscaling for heat transport in fractured geothermal reservoirs
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Numerical Analysis, NA. University of Bergen, Norway.
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2018 (English)In: Computational Geosciences, ISSN 1420-0597, E-ISSN 1573-1499, Vol. 22, no 2, p. 451-467Article in journal (Refereed) Published
Abstract [en]

In simulation of fluid injection in fractured geothermal reservoirs, the characteristics of the physical processes are severely affected by the local occurence of connected fractures. To resolve these structurally dominated processes, there is a need to develop discretization strategies that also limit computational effort. In this paper, we present an upscaling methodology for geothermal heat transport with fractures represented explicitly in the computational grid. The heat transport is modeled by an advection-conduction equation for the temperature, and solved on a highly irregular coarse grid that preserves the fracture heterogeneity. The upscaling is based on different strategies for the advective term and the conductive term. The coarse scale advective term is constructed from sums of fine scale fluxes, whereas the coarse scale conductive term is constructed based on numerically computed basis functions. The method naturally incorporates the coupling between solution variables in the matrix and in the fractures, respectively, via the discretization. In this way, explicit transfer terms that couple fracture and matrix solution variables are avoided. Numerical results show that the upscaling methodology performs well, in particular for large upscaling ratios, and that it is applicable also to highly complex fracture networks.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 22, no 2, p. 451-467
Keywords [en]
Heat transport, Fractured media, Geothermal energy, Upgridding, Upscaling, Multiscale
National Category
Computer Sciences Geology
Identifiers
URN: urn:nbn:se:kth:diva-225053DOI: 10.1007/s10596-017-9704-6ISI: 000426861200002Scopus ID: 2-s2.0-85035746307OAI: oai:DiVA.org:kth-225053DiVA, id: diva2:1194041
Note

QC 20180328

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-03-28Bibliographically 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
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