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Enhanced Viscosity of Poly(acrylamide) Solution in the Presence of Chromium Citrate Triggered by Release of CO2
Ai-guo Mo1, Yu-pu Wang1, Yi-kun Liu1, Wan-fu Zhou2, Quan Zhou2, Akram Yasin3, Hai-yang Yang3
1.School of Petroleum Engineering, Northeast Petroleum University, Daqing 163453, China;2.Oil Production Technology Institute, Daqing Oilfield Company. Ltd., Daqing 163453, China;3.School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Abstract:
Partially hydrolyzed polyacrylamide (HPAM) has been widely used for water shut-off and profile control to enhance oil recovery. Herein, we reported a novel technique by which the crosslinking between HPAM and Cr3+ in aqueous solutions at 60 ℃ can be delayed effectively. Citric acid was selected as an organic complexing agent of Cr3+ so that the crosslinking between HPAM and Cr3+ can be prevented completely. Due to the decomposition of the bicarbonate (HCO3-) embedded in solution, CO2 released from solution and the pH value of solution increased gradually. The degree of ionization of HPAM and its ability to complex with Cr3+ increased accordingly. When the complexation of Cr3+ with HPAM is stronger than that with citric acid, the viscosity of the HPAM solution increased significantly. Under the closed condition, together with the existence of potassium dihydrogen phosphate (KH2PO4), the release of CO2 was very slow and the condition was highly controlled so that the ionization of HPAM was prevented initially. Furthermore, the hydrogen bonding interactions between HPAM and melamine embedded in solution previously also postponed the ionization of HPAM. As a result, the crosslinking between HPAM and Cr3+ can be delayed for almost one month, completely meeting the requirements for deep water shut-off and profile control to enhance oil recovery.
Key words:  Polyacrylamide  Delayed cross-linking  pH responsibility  Complexation
FundProject:
利用二氧化碳的缓慢释放控制聚丙烯酰胺在含柠檬酸铬水溶液中的粘度
莫爱国1, 王玉普1, 刘义坤1, 周万富2, 周泉2, 艾克热木·牙生3, 海洋3
1.东北石油大学石油工程学院, 大庆 163318;2.大庆油田有限责任公司采油工程研究院, 大庆 163453;3.中国科学技术大学化学与材料学院, 合肥 230026
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DOI:10.1063/1674-0068/31/cjcp1706128
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