热水化学驱体系与稠油组分间相互作用及其理论模拟研究  

Interaction Between Hot Water Chemical Drive System and Thick Oil Components and Theoretical Simulation Research

作　　者：韩玉贵 刘长龙 赵鹏 郑雯雯 刘岳鹏 李轶[2] HAN Yugui;LIU Changlong;ZHAO Peng;ZHENG Wenwen;LIU Yuepeng;LI Yi(China National Offshore Oil Corporation,Tianjin Branch,Tianjin 300452,China;School of Science,Tianjin University,Tianjin 300072,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452 [2]天津大学理学院,天津300072

出　　处：《高等学校化学学报》2024年第6期138-147,共10页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:22176140、22376157)资助。

摘　　要：为了探究温度和聚合物化学剂对稠油性质的影响,通过扫描电子显微镜、傅里叶变换红外光谱仪以及流变仪对稠油组分进行了分析.由扫描电子显微镜观察到沥青质表面形态不规则,胶质表面粗糙且具有孔道结构.傅里叶变换红外光谱检测出3种稠油组分具有芳香烃的特征吸收峰.通过流变性能测试研究了聚合物化学剂的投加量、矿化度、温度和pH值对稠油流变性能和体相结构特性的影响.结果表明,聚合物投加量对稠油的储能模量和损耗模量有显著影响,而矿化度的增加则增强了稠油的复数黏度,酸性和碱性条件下稠油的黏弹性较中性条件更强.通过理论计算研究发现,添加聚合物化学剂可以降低稠油的黏度,在较高的温度下效果更加显著.沥青质与聚合物化学剂之间的相互作用最强,其次为胶质,与油分的相互作用最弱.聚合物化学剂对稠油组分的径向分布函数无明显影响,主要影响界面处的稠油组分.聚合物化学剂与沥青质可以形成氢键,添加聚合物化学剂后,沥青质内部的氢键数量减少,与聚合物化学剂之间的氢键数量增加.温度升高会减少氢键数量,尤其是沥青质与聚合物化学剂之间的氢键.To investigate the effects of temperature and polymer chemistry on the properties of thick oil,the thick oil fractions were analyzed by scanning electron microscopy,Fourier transform infrared spectrometer and rheometer.scanning electron microscopy.Results indicated that the asphaltene surface morphology was irregular,and the colloid surface was rough and had a pore structure.Fourier infrared spectroscopy detected three thick oil fractions with characteristic absorption peaks of aromatic hydrocarbons.Rheological performance test was conducted to investigate the effects of polymer chemical addition,mineralization,temperature and pH on the rheological performance and interfacial film properties of thick oil.The experimental results showed that the polymer dosage had a significant effect on the energy storage modulus and loss modulus of the thick oil,while the increase of mineralization enhanced the complex viscosity of the thick oil,and the viscoelasticity of the thick oil was stronger under acidic and alkaline conditions than that under neutral conditions.It was found through theoretical studies that the addition of polymer chemistries reduced the viscosity of thick oil and the effect was more pronounced at higher temperatures.The interaction between bitumen and polymer chemicals was the strongest,followed by colloid and the weakest interaction with oil components.The polymer chemical had no significant effect on the radial distribution function of the thick oil components,and mainly affected the thick oil components at the interface.Polymer chemicals and bitu⁃men could form hydrogen bonds,and the addition of polymer chemicals decreased the number of hydrogen bonds within the bitumen and increased the number of hydrogen bonds with the polymer chemicals.The increase of tempera⁃ture decreased the number of hydrogen bonds,especially between the asphaltene and the polymer chemical.

关 键 词：热水化学驱 流变性能 理论计算 分子动力学模拟 

分 类 号：O647[理学—物理化学] O641[理学—化学]