Abstract
Shale rock is a strongly heterogeneous, discontinuous, and porous material. Under non-isothermal conditions, the movement of fluid in the pore and capillary system is strongly coupled with heat transfer. The process of the hydraulic fracture strongly depends on the rock saturation degree. An innovative DEM-based thermo-hydro-mechanical model was developed to track in detail the liquid/gas fractions in pores and cracks with respect to their different geometry, size, location, and temperature. A coarse 2D mesh was generated to create a fluid flow network and to solve the energy conservation equation. Finally, the importance of a fully coupled thermo-hydromechanical model is illustrated by the simulation of cold fluid injection during hydraulic fracturing in a rock matrix with different degrees of water saturation.
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Acknowledgements
The present study was supported by the research project “Fracture propagation in rocks during hydro-fracking—experiments and discrete element method coupled with fluid flow and heat transport” (years 2019–2022) financed by the National Science Centre (NCN) (UMO-2018/29/B/ST8/00255).
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Krzaczek, M., Nitka, M., Tejchman, J. (2023). Modelling of Hydraulic Fracturing in Rocks in Non-isothermal Conditions Using Coupled DEM/CFD Approach with Two-Phase Fluid Flow Model. In: Pasternak, E., Dyskin, A. (eds) Multiscale Processes of Instability, Deformation and Fracturing in Geomaterials. IWBDG 2022. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-031-22213-9_12
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