Details

Autor(en) / Beteiligte

• Ren, Hao
• Ding, Xiang‐Hua
• Luo, Qiang
• Yang, Lian‐Yu
• Yong, Xiao‐Hua
• Wei, Yun
• Peng, Jian
• Deng, Yong

Titel

β‐Cyclodextrin‐functionalized copolymers based on multiple intermolecular forces for enhanced oil recovery

Ist Teil von

• Polymer engineering and science, 2020-10, Vol.60 (10), p.2581-2592

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2020

Quelle

Wiley Online Library

Beschreibungen/Notizen

• 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.