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Enhanced viscosity of poly(acrylamide) solution in the presence of chromium citrate triggered by the release of CO2
杨海洋
Author NameAffiliationE-mail
杨海洋 none yhy@ustc.edu.cn 
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 ?C 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 under a controlled condition 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:
Enhanced viscosity of poly(acrylamide) solution in the presence of chromium citrate triggered by the release of CO2
杨海洋
摘要:
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 ?C 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 under a controlled condition 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.
关键词:  Polyacrylamide  delayed cross-linking  pH responsibility  complexation
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