水凝胶体系交联过程织构变化的流变学研究  

Texture and Rheology of the Gelation Process of HPAM Aqueous Solution

作　　者：王刚[1] 许元泽[1] 范学勍[1] 曹绪龙[2] 刘坤[2] 张继超[2] 

机构地区：[1]复旦大学高分子科学系,聚合物分子工程教育部重点实验室,上海200433 [2]中国石化胜利油田有限公司地质科学研究院,东营257015

出　　处：《高等学校化学学报》2008年第9期1908-1913,共6页Chemical Journal of Chinese Universities

基　　金：胜利油田“智才”项目基金(合同号:智才2007);国家自然科学基金(批准号:20490220);国家“九七三”计划(批准号:2003CB615604)资助

摘　　要：研究了由部分水解聚丙烯酰胺水溶液交联得到的用于三次采油的弱凝胶体系,使用不同交联剂的水凝胶体系表现出不同的流变特性,反映两种不同织态结构的弱凝胶,一种为接近于均匀分形交联网的整体凝胶,另一种为有特征尺度的非均匀交联网的胶态分散凝胶.上述结果得到了光学显微镜观测的证明.强剪切和拉伸流的结果表明,当凝胶体系中存在大量胶团时,强剪切可以加强体系中网络结构的完整性,使得流变性质加强,不同于一般凝胶的减弱趋势.The weak gels based on partial hydrolyzed polyacrylamide （HPAM） aqueous solutions gelated by organic crosslinkers were investigated rheologically with application background of tertiary oil recovery. The linear and non-linear rheological properties in gelation processes of weak gels with different erosslinkers reveal two kinds of textures near the gel point, one is a fraetal network, and the other is a heterogeneous network with a characteristic dimension. The optical microscopic approved the rheological arguments. High shearing and the stretch flow in converging outlet measurements indicat that contrary to the static colloidal gels, the strong flows can reinforce the integrities of network structures and enhance the rheological properties. The potential in the EOR applications are also discussed.

关 键 词：水解聚丙烯酰胺 弱凝胶 流变性 凝胶织构 拉伸黏度 

分 类 号：O631[理学—高分子化学]