Shear Induced Seepage and Heat Transfer Evolution in a Single-Fractured Hot-Dry-Rock

In the enhanced geothermal system (EGS), injected fluid will induce shear sliding of rock fractures (i.e., hydroshearing), which consequently, would increase fracture aperture and improve heat transfer efficiency reservoir. this study, theoretical analysis, experimental research numerical simulation were performed to uncover permeability enhancement mechanism Hot-Dry-Rock (HDR) mass under impact shearing. By conducting direct test with fractured samples, evolution process during shearing tests was observed, process, cubic law adopted depict permeability. To investigate seepage characteristics temperature distribution HDR influence shearing, a study shear-seepage-heat in has been conducted validate observed shear-induced dilation test. The results demonstrate that (1) hydroshearing increases granite enhances mass, while around reduce. (2) Fracture roughness is vital importance enhance tests. be more specific, rougher always implies higher greater extraction efficiency. (3) induced extracting dominated by increased flux earlier period EGS reservoir, controlled outlet water since becomes stable after Therefore, balancing reservoir lifespan significant sustainable development utilization energy