地热流体在井筒中的流动及碳酸钙结垢过程模拟  

Process Simulation of Geothermal Fluid Flow in Wellbore and Calcium Carbonate Scaling

作　　者：卜宪标 郭志鹏[1,2] 王令宝 BU Xian-biao;GUO Zhi-peng;WANG Ling-bao(School of Energy Science and Engineering,University of Science and Technology of China,Guangzhou 510640 China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]中国科学技术大学能源科学与技术学院,广州510640 [2]中国科学院广州能源研究所,广州510640

出　　处：《新能源进展》2021年第5期434-442,共9页Advances in New and Renewable Energy

基　　金：国家重点研发计划项目(2019YFB1504104)。

摘　　要：以地热井筒流动和碳酸钙结垢过程为研究对象,建立了地热流体从井底到井口流动过程中的质量、能量以及压降数学模型并进行了求解。通过数学模型计算了质量流量和井口压力对应的关系;模拟分析了温度、压力、干度和CO_(2)分压沿井筒不同位置的变化情况;总结了井口干度、温度、压力和CO_(2)分压随热储压力、温度、流量、CO_(2)含量以及井壁粗糙度的变化规律;分析了结垢位置、结垢厚度以及结垢延续长度对井口压力的影响。结果表明,通过数学模型可以对井筒内的流动进行模拟,确定不同截面上的参数变化情况,并可进一步推导热储的特性变化情况。Taking geothermal wellbore flow and calcium carbonate scaling as the study subjects,a model of mass,energy and pressure drop describing the flow of geothermal fluid from well bottom to well head was built and solved.The relationship between mass flow rate and wellhead pressure was calculated by mathematical model;the variation of temperature,pressure,dryness and partial pressure of CO_(2)at different section were analyzed;the response variation rules of dryness,temperature,pressure and partial pressure of CO_(2)at wellhead to the reservoir temperature and pressure,mass flow rate,roughness of the well tube surface and the content of CO_(2)were revealed;the effects of scale position,thickness and length on wellhead pressure were investigated.The above calculated results indicated that the wellbore flow and parameters at different section can be simulated and calculated by mathematical model,and the reservoir characteristic can also be further deduced.

关 键 词：碳酸钙结垢 井筒流动 井筒模拟 闪蒸位置 井筒压降 热储特性 

分 类 号：TK52[动力工程及工程热物理—热能工程]