【作者】 李琳；

【导师】 夏淑倩；

【作者基本信息】 天津大学 ， 工程硕士（专业学位）， 2020， 硕士

【摘要】 CCUS（Carbon Capture,Utilization and Storage）即碳捕获、利用与封存,它将生产中排放的CO₂进行循环利用,是有效实现温室气体减排与资源化利用的重要途径之一。其中,CO₂驱油技术（CO₂-EOR-CO₂ Enhanced Oil recovery）是将二氧化碳注入地层油藏中以提高原油采收率的技术,它可在提高原油采收率的同时对CO₂进行封存,是CCUS的重要手段之一。CO₂-原油系统的界面张力（Interfacial tension-IFT）数据是CO₂-EOR技术开发和应用的重要基础数据。目前CO₂-正构烷烃系统界面张力的数据已测定及报道得较为全面,但CO₂-环烷烃/芳香烃系统的界面张力数据缺乏,不能满足CO₂-EOR技术的要求。因此,测定CO₂-环烷烃/芳香烃的界面张力数据并建立合适的CO-原油组分计算模型对CO₂-EOR技术的实施与发展具有重要的意义。本文利用课题组建立的高温高压界面张力测定装置测量了80℃下CO₂-（n-C11）体系的界面张力数据,与文献数据进行比较,验证了装置的可靠性。采用此装置测定了262组CO₂-环烷烃/芳香烃二元体系界面张力数据。并通过查阅文献,收集了大量CO₂-原油组分二元界面张力数据,包括611组CO₂-正构烷烃、40组CO₂-环烷烃、19组CO₂-芳香烃界面张力数据,通过对所有的数据进行分析,将二元界面张力关联为温度、压力、碳原子数、偏心因子以及临界温度的函数。其相关系数（R²）为0.962,均方根误差（RMSE）及平均相对偏差（AARD）分别为1.08和10.6%。此外,本文还测量了166组CO₂-正己烷+环己烷、CO₂-正己烷+甲苯三元体系界面张力数据,其中原油组分间的摩尔比分别为1:1、1:3和3:1。并通过分析发现三元界面张力数据可关联为二元数据的简单线性加和,计算结果良好,其R²为0.991、RMSE和AARD分别为0.440和6.84%。最后,本文将线性梯度理论与PR方程相结合,对CO₂-环戊烷/环己烷/环辛烷/甲苯/乙苯/乙基环己烷6种二元体系的界面张力进行了计算,其AARD分别为6.89%、10.5%、10.4%、8.46%、12.0%以及11.6%,模拟结果较好。本研究提供的CO₂-烃类体系的界面张力数据及模型为CO₂-EOR技术提供了数据支撑。更多还原

【Abstract】 CO₂ capture,transport,utilization and storage（CCUS）is a cutting-edge technology for mitigating global climate change.CO₂ Enhanced Oil recovery（CO₂-EOR）is one of the important means to seal CO₂ while enhancing Oil recovery.The interfacial properties of components can be changed when CO₂ is dissolved in crude oil.Therefore,the interfacial tension（IFT）data of CO₂-hydrocarbons in crude oil system are important basic data of CO₂ oil extraction technology.At present,there are plenty of experimental interfacial tension data of CO₂-n-alkanes system.But the experimental interfacial tension data of CO₂-cycloalkanes/aromatic hydrocarbons system are not sufficient yet and cannot meet the requirements of CO₂-EOR.Therefore,it is of great significance for the development of CO₂-EOR technology to study on the interfacial tension data of CO₂-cycloalkanes/aromatics.In this work,the experimental equipment for measuring surface tension by pendant drop method at high temperature and high pressure was used.The equipment was designed and set up by the research group.The interfacial tension data of CO₂-（n-C11）system at 80℃were measured by the equipment.The experimental data were evaluated and the experimental equipment was proved validity.262 groups of the interfacial tension values of CO₂-cycloalkane/aromatics binary systems were determined by this device.A large number of interfacial tension experimental data of binary CO₂-hydrocarbon systems were collected from the literature,including 611sets of CO₂-（n-alkanes）,40 sets of CO₂-cycloalkanes and 19 sets of CO₂-aromatics.The interfacial tension values were analyzed and correlated as a function of temperature,pressure,carbon atom number,acentric factor and critical temperature.The correlation coefficient（R²）was 0.962,the root mean square error（RMSE）and the mean relative deviation（AARD）were 1.08 and 10.6%,respectively.In addition,166 sets of the interfacial tension data of CO₂-（n-hexane+cyclohexane）and CO₂-（n-hexane+toluene）ternary systems were also measured.The ternary interfacial tension data can be correlated as a simple linear summability model of the interfacial tension data of the relevant binary systems.The calculated results are good,with R² of 0.991 RMSE and AARD being 0.440 and 6.84%,respectively.Finally,the linear gradient theory is combined with the PR equation of state was used to calculate the interfacial tension values of the six binary systems for CO₂-cyclopentane/cyclohexane/cyclooctane/toluene/ethylbenzene/ethylcyclohexane.The AARD were 6.89%,10.5%,10.4%,8.46%,12.0%,and 11.6%,respectively.All the interface tension data and the models of CO₂-hydrocarbon systems provided in this study are important support for CO₂-EOR technology.更多还原