Abstract
Accurately assessing the impact of hydraulic fracturing technology on the heat exchange efficiency of Enhanced Geothermal Systems (EGS-E) is crucial. This paper proposes a coupled FDEM-CFD method to predict the heat exchange efficiency of EGS-E systems. Firstly, the FDEM method was adopted to establish a numerical model for EGS-E horizontal roadways. The physical process of fracture initiation, propagation, and the eventual formation of a coherent fracture network within intact rock mass were numerically studied. Subsequently, combined with CFD method, the flow and heat exchange processes between cold water and rock in horizontal roadway were investigated. The effects of hydraulic fracturing technology on the heat exchange efficiency of EGS-E project were comprehensively studied by comparing the water-rock heat exchange efficiency before and after fracturing. The results show that, hydraulic fracturing can increase the water-rock heat exchange area by 1385.5710 %, and the temperature difference between inlet and outlet increases by 8.3365 %. It shows that hydraulic fracturing improves the heat exchange efficiency of EGS-E.
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