井下同轴换热系统最佳流量设计方法  

OPTIMAL FLOW RATE DESIGN METHOD OF DOWNHOLE COAXIAL HEAT EXCHANGER SYSTEM

作　　者：肖东 蔡纯 杨瑞涛 杨凯杰 高若禹 Xiao Dong;Cai Chun;Yang Ruitao;Yang Kaijie;Gao Ruoyu(Petroleum Engineering Institute,Southwest Petroleum University,Chengdu 610500,China;Shanxi Yanchang Petroleum International Energy and Chemical Co.,Ltd.,Xi’an 710065,China;Lao Junmiao Oil Production Plant,Yumen Oilfield Branch,China National Petroleum Corporation,Jiuquan 735200,China)

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500 [2]陕西延长石油国际能源化工有限公司,西安710065 [3]中国石油天然气股份有限公司玉门油田分公司老君庙采油厂,酒泉735200

出　　处：《太阳能学报》2023年第10期473-480,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51874252);中国石油科技创新基金(2020D-5007-0312);四川省重点研发项目(2023YFS0358);延长石油科技计划项目(GJM18TLH0005)。

摘　　要：利用井下同轴换热系统(DCHES)取热是一种开发岩层地热能的有效手段,但目前缺乏针对其流量优化的设计方法。依据流动与传热基本原理,建立DCHES取热数学模型,并通过现场测试数据进行验证。耦合取热功率的可用性,形成DCHES最佳流量的设计方法,并以西安地区为例开展现场应用。结果表明:取热功率的可用性随流量的增大先增加后减小;取热功率可用性最大时所对应的流量即为DCHES的最佳流量。在DCHES的实际运行中,可利用本方法不断调整运行流量以获得最大[火用]功率。The utilization of downhole coaxial heat exchanger system(DCHES)is an effective means to develop geothermal energy in rock formation.However,there is currently a lack of design methods to optimize its operating flow rate.Based on the basic principles of flow and heat transfer,a mathematical model of DCHES is established and verified by the field test data.By coupling the availability of heat extraction power,an optimal flow rate design method of DCHES was established.The field application was carried out in Xi'an area as an example.The results show that the availability of the heat extraction power first increases and then decreases with the increase of the flow rate;the flow rate corresponding to the maximum extraction heat power is the optimal flow rate of DCHES.In the operation of DCHES,this method can be used to continuously adjust the operating flow to obtain the maximum exergy power.

关 键 词：地热能 换热器 火用 最佳流量 井筒传热模型 

分 类 号：TK529[动力工程及工程热物理—热能工程]