Acrylamide copolymer in the chemical flooding process plays a significant role in the field of tertiary recovery for enhanced oil recovery. Allyl-β-cyclodextrin and octadecyl dimethyl allyl ammonium chloride are utilized to react with acrylamide to synthesize a novel cyclodextrin-functionalized hydrophobically associating acrylamide polymer (HCMPAM) by redox freeradical polymerization. The microstructure of HCMPAM is the spatial network characterized by Fourier transform infrared spectroscopy and atomic force microscopy, and the thermal stability of HCMPAM is investigated by thermal gravimetic analysis. In the performance evaluation experiments, HCMPAM demonstrates superior properties compared to the high molecular weight partially hydrolyzed polyacrylamide on the aspects of salt tolerance, temperature resistance, shear resistance, and surfactant compatibility. It was found that the viscosity of 2000 mg/L HCMPAM reaches a maximum at 80 °C, and it could maintain 45.7% viscosity retention rate at 120 °C under the conditions of 20000 mg/L NaCl, 2000 mg/L CaCl 2 , and 10 s −1 shear rate. The viscosity can recover immediately with a slight decrease to the primary value during repeated revisable shear (100 s −1 −0). In addition, the flooding mechanism of mixed flooding of HCMPAM and surfactant is put forward by the interaction between them. The simulative tertiary oil recovery tests signify that HCMPAM can remarkably enhance 5.7−9.4% of oil recovery ratio, especially while HCMPAM is used after HPAM flooding. These features indicate that HCMPAM has a great potential application for enhanced oil recovery, especially in high-temperature and high-mineralization oil fields.
Owing to superior properties such as temperature resistance and salt tolerance etc., modified polyacrylamide (PAM) as one of the main injected polymers has been widely investigated to enhance oil production in reservoirs. Herein, a novel poly(AM-co-A-b-CD-co-AE) polymer was synthesized by utilizing b-CD and AE to copolymerize with AM and characterized by FT-IR and SEM. Furthermore, the temperature resistance and salt tolerance of poly(AM-co-A-b-CD-co-AE) polymer were explored. The results showed that the presence of the poly(AM-co-A-b-CD-co-AE) polymer better achieved temperature resistance and salt tolerance properties than is the case with PAM, which has potential application for enhancing oil recovery in the high-temperature and high-mineralization oilfield. On the other hand, the inhibition performance of poly(AM-co-A-b-CD-co-AE) polymer as a corrosion inhibitor was evaluated by SEM and electrochemical techniques. SEM observations of the carbon steel surface confirmed the protective role of the corrosion inhibitor. The results of potentiodynamic polarization and EIS measurements on the corrosion inhibition of carbon steel samples in 0.5 M sulfuric acid solutions revealed that the highest inhibition efficiency of it over 90% was obtained, indicating poly(AM-co-A-b-CD-co-AE) polymer acts as a more efficient corrosion inhibitor for carbon steel.
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