锆冻胶反应进程、微观结构及成冻影响因素研究

Study on crosslinking reaction process，microstructure and influencing factors of gels formed by polymer and zirconium acetate

马丽萍 杨棠英 黎晓茸 张 涛 谭俊领 赵光 戴彩丽

MA Li-Ping YANG Tang-Ying LI Xiao-Rong ZHANG Tao TAN Jun-Lin ZHAO Guang DAI Cai-Li

本文研究的锆冻胶由非离子聚合物和有机锆交联形成的。采用流变仪表征了锆冻胶交联过程中的黏度变化特征，其交联过程分为诱导期、快速增长期和稳定期3个阶段。采用环境扫描电镜（ESEM）直接证实了锆冻胶为致密的三维网状结构。研究了聚合物浓度、交联剂浓度、温度、矿化度、pH对锆冻胶成冻时间和成冻强度的影响。研究结果表明：聚合物和交联剂浓度越大，温度、矿化度越高，锆冻胶成冻时间越短，成冻强度越大。三种无机盐离子对锆冻胶成冻性能的影响顺序为：CaCl2> MgCl2>NaCl，当基液pH 值在7~ 8时，成冻效果最好。差示扫描量热分析仪（DSC）测试结果表明锆冻胶适用于温度小于130℃的油气藏。图9表2参10

The gel system composed of polyacrylamides and zirconium acetate was investigated in the paper. The change of the viscosity of the gel system was investigated in the crosslinking reaction process. The reaction process could be divided into three successive steps: induction period, rapid cross-linking period, and stabilization period. The gel formed in a 3-dimensional network structure was confirmed by environmental scanning electron microscopy (ESEM). With the increase of polymer concentration and crosslinker concentration, reaction temperature and salt content, the gelation time reduced, and the gel strength increased. Three salts were arranged according to their influence on gelation system in following order: CaCl2 > MgCl2 > NaCl. A solution with pH value of 7-8 was the best suitable for the gel system. the gel system was suitable for the reservoir with the temperature below130℃.