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Improving thermal response tests with wireline temperature logs to evaluate ground thermal conductivity profiles and groundwater fluxes.

Koubikana Pambou, Claude Hugo; Raymond, Jasmin; Lamarche, Louis (9999). Improving thermal response tests with wireline temperature logs to evaluate ground thermal conductivity profiles and groundwater fluxes. Heat and Mass Transfer . DOI: 10.1007/s00231-018-2532-y. (Sous Presse)

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Résumé

A field method was developed to assess subsurface thermal conductivity profiles and groundwater fluxes from manual temperature logs using a wired probe lowered into a U-pipe during the recovery period of a thermal response test (TRT). Temperature and depth were recorded with a wired temperature and pressure data logger, which triggers a water level rise into a U-pipe. Depth correction methods were introduced and validated using subsurface temperature at equilibrium state measured into U-pipe. Wired temperature logs from recovery period after drilling operation were used to evaluate undisturbed subsurface temperature and during a conventional TRT to assess a thermal conductivity profile with approximately 1 m vertical spatial resolution. TRT analysis was improved by combining the infinite line source equation with the temporal superposition principle and slope method. The results reveal zones of higher apparent thermal conductivity identified as fractured zones in which Darcy’s flux has been quantified using the Peclet number analysis. The average subsurface thermal conductivity inferred with this method was 1.79 W m⁻¹ K⁻¹, similar to 1.75 W m⁻¹ K⁻¹ obtained using conventional TRT analysis. The estimated Darcy’s flux in the fracture zones is 3 × 10⁻⁹ to 1 × 10⁻⁸ m s⁻¹. This method, based on wired temperature profiling along the borehole, provides a new approach using simple equipment and available analytical solutions to obtain more information from conventional TRT analysis.

Type de document: Article
Mots-clés libres: heat pump; ground heat exchanger; thermal response test; temperature profile; wired probe; thermal conductivity profile; thermostratigraphic log
Centre: Centre Eau Terre Environnement
Date de dépôt: 04 mars 2019 16:45
Dernière modification: 04 mars 2019 16:45
URI: http://espace.inrs.ca/id/eprint/7863

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