TY - JOUR
T1 - Method to Improve Heat Extraction in Enhanced Geothermal Systems with Heterogeneous Fracture Network
AU - Huang , Qiang
AU - Guo , Ning
AU - Huang , Haibo
AU - Yu , Jie
AU - Pei , Gang
AU - Hu , Maobin
JO - Advances in Applied Mathematics and Mechanics
VL - 1
SP - 1
EP - 30
PY - 2024
DA - 2024/12
SN - 17
DO - http://doi.org/10.4208/aamm.OA-2024-0122
UR - https://global-sci.org/intro/article_detail/aamm/23591.html
KW - Enhanced geothermal systems, heterogeneous discrete fracture network, injection and production modes, heat extraction.
AB - <p style="text-align: justify;">In typical EGS fracturing projects, the fracture network is denser in the region close to the fracturing wells. The distribution of fractures has a significant impact
on the heat extraction performance of enhanced geothermal system (EGS). In order to
avoid premature thermal breakthrough and improve the thermal extraction efficiency,
this paper studies the heat extraction performance of EGS in heterogeneous fractured
reservoirs under different injection-production methods. First, a heterogeneous discrete fracture network generation method based on relative pressure distribution is
developed. A thermo-hydraulic-mechanical (THM) coupling model is established to
simulate the fluid flow and heat transfer in reservoirs. The heat extraction performance
under different production and injection modes is compared with different fracture
densities. The results show that injection in the dense side of the anti-parallel well
configuration will be more efficient for heat extraction. Under the condition of same
injection mass flow rate, the heat extraction performance is positively correlated with
the fracture density. Although sparse-side injection is not conducive to fluid flow, under the condition of same injection mass flow rate with anti-parallel well configuration,
it will improve the thermal extraction performance.</p>