承德地区中深层地热单井换热效果分析  

Heat Transfer Effect of Mid to Deep Geothermal Single Well in Chengde Area

作　　者：傅大庆 邱建强 亓兆伟 闫方平 FU Da-qing;QIU Jian-qiang;QI Zhao-wei;YAN Fang-ping(Hebei Huakan Zihuan Survey Co.,Ltd.,Chengde 067000,Hebei,China;Hebei Petroleum University of Technology,Chengde 067000,Hebei,China)

机构地区：[1]河北华勘资环勘测有限公司,河北承德067000 [2]河北石油职业技术大学,河北承德067000

出　　处：《承德石油高等专科学校学报》2024年第4期45-48,94,共5页Journal of Chengde Petroleum College

基　　金：承德市科技计划项目:202205B004。

摘　　要：地热资源作为一种绿色可再生能源,是未来的重要替代能源之一,中深层地热单井换热是一种开发地热能的新技术。根据承德地区地热地质特点,通过COMSOL Multiphysics数值模拟软件建立单井换热器与周围岩体之间的耦合换热模型,并分析内管和固井水泥的导热系数对出口温度和换热效率的影响。研究表明,内管导热系数对换热效果影响显著,内管导热系数越小,系统换热效率越高,可选择新型的气凝胶绝热材料代替传统的PE管材料提高系统换热性能;固井水泥与岩体导热系数接近时,增强换热效果显著,在具体工程中应根据岩体导热系数研究新型固井水泥,使二者导热系数接近,以减小固井水泥对换热效率的影响。Geothermal resource,as a green and renewable energy resource,is one of the important alternative energy resources in the future.Single well heat exchange in mid to deep geothermal ener-gy is a new technology for developing geothermal energy.Based on the geothermal geological charac-teristics in Chengde area,a coupled heat transfer model between a single well heat exchanger and the surrounding rock mass is established by using COMSOL Multiphysics numerical simulation soft-ware,and the influence of thermal conductivity of the inner tube and cementing cement on the outlet temperature and heat transfer efficiency is analyzed.The research shows that thermal conductivity of the inner tube has a significant impact on the heat transfer effect.The smaller the thermal conductiv-ity of the inner tube is,the higher the heat transfer efficiency of the system becomes.A new type of aerogel insulation material can be selected to replace the traditional PE pipe material to improve the heat transfer performance of the system;when the thermal conductivity of cementing cement and rock mass is close,the enhanced heat transfer effect is significant.In specific engineering,new cementing ce-ment should be studied based on the thermal conductivity of rock mass to make the thermal conductivity of the two close,which helps to reduce the impact of cementing cement on heat transfer efficiency.

关 键 词：单井换热 导热系数 换热效果 

分 类 号：P314[天文地球—固体地球物理学]