As one of mature enhanced oil recovery (EOR) technologies, polymer flooding has been extensively applied in oilfield. In this study, new hydrophobically associative copolymers were synthesized by free‐radical polymerization of acrylamide (AM), acrylic acid (AA), vinyl‐modified β‐cyclodextrins, and a water‐soluble hydrophobic macromonomer (AA‐APE‐20). Fourier transform infrared, proton‐nuclear magnetic resonance, and scanning electron microscopy verified the structure of hydrophobically associative polymers (HDAPAMs). Compared with partially hydrolyzed polyacrylamide (HPAM), multiple intermolecular forces including chelation between ethoxyl (EO) group and Ca²⁺/Mg²⁺, electrostatic bridges between EO groups and carboxyl groups (COO⁻), hydrogen bonding between EO groups and AM groups (CONH₂), hydrophobic association among nonyl phenol groups, and host‐guest inclusion interaction endowed HDAPAMs favorable temperature‐resistance, salt‐resistance, and displacement efficiency. It was found that HDAPAMs showed evident temperature‐response, salt thickening effect, favorable thixotropy, and viscoelasticity. Compared with HPAM, the core flooding experiments demonstrated that HDAPAMs could further enhance 6.97% to 8.43% oil recovery, even after HPAM flooding used. All the results revealed the EOR potential in HDAPAMs flooding.

中文翻译：

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基于多种分子间力的β-环糊精官能化共聚物，可提高采油率

作为一种成熟的提高采收率技术，聚合物驱已经在油田中得到了广泛的应用。在这项研究中，通过丙烯酰胺（AM），丙烯酸（AA），乙烯基改性的β-环糊精和水溶性疏水大分子单体（AA-APE-20）的自由基聚合反应合成了新的疏水缔合共聚物。傅立叶变换红外，质子核磁共振和扫描电子显微镜验证了疏水缔合聚合物（HDAPAM）的结构。与部分水解的聚丙烯酰胺（HPAM）相比，多分子间力，包括乙氧基（EO）基团和Ca之间螯合²⁺ / Mg的²⁺，EO基团和羧基（间的静电桥 COO ^-），EO基团和AM基（间的氢键 CONH ₂），疏水性的壬基酚组之间的关联，和主-客体相互作用夹杂物赋予有利HDAPAMs温度-电阻，耐盐性，和位移的效率。发现HDAPAMs具有明显的温度响应，盐增稠作用，良好的触变性和粘弹性。与HPAM相比，核心驱油实验表明，即使使用HPAM驱油，HDAPAM仍可以进一步提高6.97％至8.43％的采油率。所有结果都揭示了HDAPAM洪水的EOR潜力。