单井换热性能分析及优化  

Single well heat transfer performance analysis and optimization

作　　者：邓宇杰 刘刚[1] 廖胜明[1] DENG Yujie;LIU Gang;LIAO Shengming(School of Energy Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2023年第10期4071-4082,共12页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52076218);郴州国家可持续发展议程创新示范区建设专项资助项目(2019sfp02);湖南省自然科学基金资助项目(2018JJ2518)。

摘　　要：充分考虑管壁的对流换热强化机理,通过流体流动与固体传热综合理论分析,建立单井的岩井换热模型,优化套管井地下结构。研究结果表明:枝状井网岩井系统因其出水温度和出口截面积远比传统单井系统的大,热利用效率明显提高;蛇形井段可以显著提高系统的换热能力,但由于该结构中相邻井管比较密集,会在换热过程中造成周围岩层温度急剧下降,从而影响系统长期的换热性能;空间换热板型单井系统的换热性能和稳定性都远比其他的单井系统的好,更能适应不同工况下对循环工质不同流速的需求,也更能满足出口温度需求的多样性。The strengthening mechanism of convective heat transfer in pipe wall was fully considered.Through comprehensive theoretical analysis of fluid flow and solid heat transfer,the rock well heat transfer model of single well and group well were established to optimize the underground structure of casing well.The results show that the outlet temperature and outlet cross-sectional area of the dendritic well pattern are much larger than those of the traditional single well system,the heat utilization efficiency of the dendritic well pattern is obviously improved.The serpentine section can significantly enhance the heat transfer capability of a single well system.However,due to the dense adjacent well tubes,the temperature of the surrounding strata will drop sharply during the heat transfer process,thus affecting the long-term heat transfer performance.The heat transfer performance and stability of the space heat exchanger plate type single well system are far better than those of other single well systems,which has better adaptability for changes in flow rate and can better meet the diversity of outlet temperature requirements.

关 键 词：套管井换热技术 结构优化 数值模拟 

分 类 号：TK529[动力工程及工程热物理—热能工程]