TY - JOUR
T1 - Heat extraction study of a novel hydrothermal open-loop geothermal system in a multi-lateral horizontal well
AU - Wang, Gaosheng
AU - Song, Xianzhi
AU - Yu, Chao
AU - Shi, Yu
AU - Song, Guofeng
AU - Xu, Fuqiang
AU - Ji, Jiayan
AU - Song, Zihao
PY - 2022
Y1 - 2022
N2 - The efficient development of hydrothermal resource is an important focus in the global geothermal industry. A novel hydrothermal open-loop geothermal system in a multi-lateral horizontal well is presented to achieve the simultaneous exploitation of multi-layer reservoirs and accelerate the large-scale development of the hydrothermal resource. To investigate the detailed performance of the novel geothermal system, a novel 3D fluid flow and heat transfer numerical model is established based on the local thermal non-equilibrium and dual porosity theories. The flow and temperature fields are analyzed, while the pressure and temperature interferences between the lateral wellbores of the multi-lateral horizontal well system are comprehensively investigated. The influences of the injection flow rate, lateral-wellbore number, spacing between the injection segment and the main wellbore, fracture aperture on the heat extraction are studied. Furthermore, the thermal characteristics of the novel geothermal system and traditional doublet well system are compared for the first time. The investigation indicates that the flow impedance of the novel geothermal system can decrease by 75.38%, and its energy efficiency reaches 8 times that of the doublet well system. The findings can provide a key reference for scientific research and application of the novel and traditional geothermal systems.
AB - The efficient development of hydrothermal resource is an important focus in the global geothermal industry. A novel hydrothermal open-loop geothermal system in a multi-lateral horizontal well is presented to achieve the simultaneous exploitation of multi-layer reservoirs and accelerate the large-scale development of the hydrothermal resource. To investigate the detailed performance of the novel geothermal system, a novel 3D fluid flow and heat transfer numerical model is established based on the local thermal non-equilibrium and dual porosity theories. The flow and temperature fields are analyzed, while the pressure and temperature interferences between the lateral wellbores of the multi-lateral horizontal well system are comprehensively investigated. The influences of the injection flow rate, lateral-wellbore number, spacing between the injection segment and the main wellbore, fracture aperture on the heat extraction are studied. Furthermore, the thermal characteristics of the novel geothermal system and traditional doublet well system are compared for the first time. The investigation indicates that the flow impedance of the novel geothermal system can decrease by 75.38%, and its energy efficiency reaches 8 times that of the doublet well system. The findings can provide a key reference for scientific research and application of the novel and traditional geothermal systems.
KW - Geothermal energy
KW - Heat extraction
KW - Hydrothermal resource
KW - Multi-lateral horizontal well
KW - Open-loop
UR - http://www.scopus.com/inward/record.url?scp=85119523395&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2021.122527
DO - 10.1016/j.energy.2021.122527
M3 - Article
AN - SCOPUS:85119523395
SN - 0360-5442
VL - 242
JO - Energy
JF - Energy
M1 - 122527
ER -