In order to meet the high strength requirement,acrylamide/tert-butyl acrylate Copolymer(PAtBA)and crosslinking agent polyethyleneimine(PEI)was used to prepare the gellant,the influence of the content of polymer,the content and molecular weight of crosslinking agent,temperature,salt content and pH on the gelation was emphatically studied. Experimental results showed that gel strength was positively correlated with the content of polymer and crosslinking agent. When the pH value was in range of 6—9,as the pH value increased,the gelation time was prolonged;when the pH value was in the range of 9—12,as the pH value increased,the gelation time was shortened. With the salt content increased,the gel strength would first increase and then decrease. The relationship between gelation time and temperature conformed to the Arrhenius formula,the activation energy required for the reaction was 48.36 kJ/mol. Storage modulus of the gel formed at the temperature of 110℃,which was composed of 5% PAtBA and 1.5% PEI,could reach up to 2689.2 Pa. The gel strength could maintain I level for more than 30 days at the temperature of 170 ℃,indicating that PEI gel had excellent temperature resistance. In addition,compared with chrome gel and phenolic gel,PEI gel had low toxicity and was more suitable for offshore oilfields.
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赵 赛,葛际江,朱 杰,张洪海.油井堵水用高强度PEI冻胶研究*[J].油田化学,2021,38(3):434-439. ZHAO Sai, GE Jijiang, ZHU Jie, ZHANG Honghai. Research on High-strength PEI Gel Used for Oil Well Water Plugging[J]. OILFIELD CHEMISTRY,2021,38(3):434-439.