Enhanced Viscosity of Poly（acrylamide）Solution in the Presence of Chromium Citrate Triggered by Release of CO2  

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（英文）

作　　者：莫爱国 王玉普 刘义坤[1] 周万富[2] 周泉[2] 艾克热木·牙生 杨海洋[3] 

机构地区：[1]东北石油大学石油工群学院,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

出　　处：《Chinese Journal of Chemical Physics》2018年第1期117-122,I0002,共7页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.51273189);the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2016ZX05016);the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2016ZX05046)

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 ℃ 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 decomposi- tion 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 signif- icantly. 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 con- trolled 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 

分 类 号：TE39[石油与天然气工程—油气田开发工程]