Investigations of heat extraction for water and CO2 flow based on the rough-walled discrete fracture network

Jiawei Li, Zhixue Sun, Yin Zhang, Chuanyin Jiang, Claudia Cherubini, Alexander Scheuermann, Sergio Andres Galindo Torres and Ling Li

Energy, 2019, vol. 189, issue C

Abstract: The Enhanced Geothermal Systems (EGS) has been developed to enhance geothermal energy extraction efficiency from geothermal reservoirs by generating effective fracture network. The fracture effective network that are comprised by rough-walled fractures can provide a more realistic reflection of natural reservoir conditions. This study focuses on the construction of a rough-walled discrete fracture model to simulate mass and heat transfer in a geothermal reservoir by using water and CO2 as the working fluid. The thermal-hydraulic-mechanical (THM) coupling process was integrated into the rough-walled discrete fracture network model. The heat mining processes with two working fluids (water and CO2) were simulated with the parallel-plate and rough-walled discrete facture network models. The influences of the parallel and rough-walled discrete fracture network models on flow behaviours, heat transfer and corresponding mechanical responses for water and CO2 were presented and analysed. What’s more, the heat extraction efficiency based on the combination of rough-walled discrete fracture network and the THM method were calculated and analysed in details. The influences of pressure, temperature, fluids and reservoir rock properties on heat extraction rates were also considered.

Keywords: Rough fractures; Discrete fracture network; Thermal-hydraulic-mechanical coupling; Heat extraction (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:189:y:2019:i:c:s0360544219318791

DOI: 10.1016/j.energy.2019.116184

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