Investigation of Heat Extraction in an Enhanced Geothermal System Embedded with Fracture Networks Using the Thermal–Hydraulic–Mechanical Coupling Model

This paper presents a numerical study on thermal energy mining from hot dry rock (HDR) using an enhanced geothermal system (EGS). In these simulations, the thermal–hydraulic–mechanical (THM) coupling model is employed basis of embedded discrete fracture model. The evolution physical fields fractured reservoir, including temperature field, pressure and stress field studied over time, effects different controllable factors, such as morphology, fluid injection rate, distances between well producing heat recovery capacity are investigated. results show that morphology significantly influences extraction performance. working mainly flows along with networks, which causes locally low temperatures mean effective near fractures. porosity permeability increase due to decrease in stress. For reservoir models inclined fractures, there will be significant temperature. 30th year, decline rate 46.6%, much higher than without Moreover, increasing barely production temperature, while it decreases EGS. When spacing small, way improve performance paper, increases up 13.7% when injection-production increased 150 m 450 m. this work could provide guidance for optimization operation