Abstract

ABSTRACT Enhanced geothermal system (EGS) is an effective method for extracting thermal energy from Hot Dry Rock (HDR) reservoirs. Fracture characterization determines the pathways for fluid flow and the mechanisms of heat transfer, both of which exert a substantial influence on the thermal recovery performance of EGS. This study develops a two-dimensional discrete fracture thermal-hydraulic (TH) coupled numerical model to investigate the influence laws of fracture characteristic parameters on the thermal recovery performance of EGS. The reliability of the numerical model is verified by comparison with the analytical method. Moreover, the Morris method is employed to evaluate the extent to which various system parameters affect the output temperature of EGS. The findings indicate that when the fracture opening expands from 0.5 mm to 3 mm, the output temperature decreases from 120.75°C to 94°C, while electrical output power increases; When the fracture permeability increases from 1 × 10−9 m2 to 4 × 10−9 m2, the output temperature drops by 30.7%, but the electrical output power increases by 0.98 MW. That is, with higher fracture opening and permeability, the fluid will flow inside the fracture with higher velocity, leading to a reduction in the output temperature of EGS and an increase in electrical output power; Injection temperature holds the greatest influence on the system, while the system’s output temperature demonstrates insensitivity to the variation of rock permeability.

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