Li Xiang, Ju Ye, Jia Yongkang, Liu Fenggang, Liu Guangpu, Wang Shuo, Wang Haoyi, Mao Shihua, Yang Jintao, Du Guangyan
China Oilfield Services Limited, Tianjin P. R.China.
College of Materials Science& Engineering, Zhejiang University of Technology, Hangzhou P. R. China.
Des Monomers Polym. 2022 Aug 11;25(1):220-230. doi: 10.1080/15685551.2022.2111845. eCollection 2022.
Development of polymer-based flooding technology to improve oil recovery efficiency, water dispersion copolymerization of acrylamide, cationic monomer methacryloxyethyltrimethyl ammonium chloride (METAC), and anionic monomer acrylic acid (AA) were carried out in aqueous ammonium sulfate solution with polyvinyl pyrrolidone (PVP) as the stabilizer. The copolymers were characterized by H-NMR, FT-IR, TG, and SEM to confirm that they were prepared successfully and exhibited excellent salt-resistant property. Moreover, the effect of the aqueous solution of ammonium sulfate (AS) concentration, stabilizer concentration, and initiator concentration on the viscosity and size were systematically investigated. To further improve the thermal endurance properties of copolymer, hydrophobic monomers with different alkyl chain lengths were added to the above system. The acrylamide-based quadripolymer possessed prominent thermal and salt endurance properties by utilizing the advantages of zwitterionic structure and hydrophobic monomer. With the temperature rising, the viscosity retention could reach 70.2% in the water and 63.8% in the saline. This work had expected to provide a new strategy to design polymers with excellent salinity tolerance and thermal-resistance performances.
为提高原油采收率而开展的聚合物驱油技术研究中，以聚乙烯吡咯烷酮（PVP）为稳定剂，在硫酸铵水溶液中进行丙烯酰胺、阳离子单体甲基丙烯酰氧乙基三甲基氯化铵（METAC）和阴离子单体丙烯酸（AA）的水分散共聚反应。通过氢核磁共振（H-NMR）、傅里叶变换红外光谱（FT-IR）、热重分析（TG）和扫描电子显微镜（SEM）对共聚物进行表征，以确认其成功制备并具有优异的抗盐性能。此外，系统研究了硫酸铵（AS）水溶液浓度、稳定剂浓度和引发剂浓度对共聚物粘度和粒径的影响。为进一步提高共聚物的耐热性能，向上述体系中加入不同烷基链长度的疏水单体。通过利用两性离子结构和疏水单体的优势，基于丙烯酰胺的四元共聚物具有突出的耐热和抗盐性能。随着温度升高，在水中的粘度保留率可达70.2%，在盐水中可达63.8%。这项工作有望为设计具有优异耐盐性和耐热性能的聚合物提供一种新策略。
