哈尔滨工程大学学报2024，Vol.45Issue(6)：1066-1075,10.DOI:10.11990/jheu.202203021
基于热流固耦合的单井增强地热系统数值模拟
Numerical simulation of a single-well enhanced geothermal system based on thermal-hydraulic-mechanical coupling
摘要
Abstract
To improve the heat extraction efficiency of deep well heat exchangers,a single-well enhanced geother-mal system(SEGS)was proposed using the development idea of hot dry rock for reference.The rock mass at the bottom of a single-well casing was reformed by small-scale fracturing;the single-well casing was changed from a closed system to an open system to improve the heat extraction performance of a single-well system.A thermal-hy-draulic-mechanical coupling three-dimensional unsteady-state numerical model was established to study the system performance of SEGS and the influence of various key parameters.Results show that compared with the traditional deep well heat exchanger,SEGS has a greatly improved heat collection performance.Under the same injection con-dition,the production temperature and heat collection power are increased by 62.21℃and 2 612.99 kW,respec-tively.In terms of a geothermal engineering cycle and optimization,it is more appropriate to control the SEGS flow at 10 kg/s.A small flow of SEGS decreases heat extraction efficiency,and a large flow shortens service life.In-creasing the wellbore spacing and reducing the thermal conductivity of the inner pipe effectively improves the heat transfer performance of the system.Herein,we provide a reference for the theoretical analysis and practical appli-cation of SEGS.关键词
地热能/深井换热器/增强型地热系统/单井/多孔介质/压裂储层/渗透率/热流固耦合Key words
geothermal energy/deep borehole heat exchanger/enhanced geothermal system/single well/porous media/fractured reservoir/permeability/thermal-hydraulic-mechanical coupling分类
能源科技引用本文复制引用
郭志鹏,卜宪标,赵源,李华山,王令宝..基于热流固耦合的单井增强地热系统数值模拟[J].哈尔滨工程大学学报,2024,45(6):1066-1075,10.基金项目
国家自然科学基金项目(42102336). （42102336）
