Experimental Study of Cucurbit[7]uril Derivatives Modified Acrylamide Polymer for Enhanced Oil Recovery

Acrylic acid cucurbit[7]uril ester (ACE) was prepared and utilized to react with acrylamide (AM) and hexadecyl dimethyl allyl ammonium chloride (C16DMAAC) to synthesize a novel AM copolymer (AM/ACE/C16DMAAC) through redox free-radical polymerization in aqueous solution. The chemical structure of AM/ACE/C16DMAAC was confirmed by Fourier transform IR and 1H NMR spectroscopies. Characterizations consisted of scanning electron microscopy, thermogravimetric analysis, and static light scattering, and the performance evaluations were conducted on several aspects such as intrinsic viscosity, stability, viscoelasticity, adsorption, and core-flooding experiments. Experiment results demonstrated the introduced ACE group could improve the salt tolerance and temperature resistance of polymer. Moreover, AM/ACE/C16DMAAC could significantly increase the oil recovery of 21.43%. The superior performances of AM/ACE/C16DMAAC revealed a potential application in high-temperature and high-mineralization oilfields for enhanced o...