阳离子聚合物铬冻胶的研制与性能评价

Preparation and Performance Evaluation of Cationic Polymer Chromium Gel

针对高强度铬冻胶堵剂普遍成胶过快的问题,通过优选阳离子聚合物并利用铝溶胶对配方进行优化,制得适用于深部调剖的阳离子聚合物有机铬冻胶堵剂,并对其性能进行了评价。结果表明,对于丙烯酰胺(AM)/丙烯酰氧乙基三甲基氯化铵(DAC)二元共聚物有机铬冻胶,其阳离子度越低,成胶时间越长;铝溶胶可以有效延缓阳离子聚合物有机铬冻胶成胶时间,并能提高其强度和长期稳定性;阳离子聚合物有机铬冻胶体系最优配方为0.8%聚合物Y5(阳离子度5%)+0.3%醋酸铬+0.2%铝溶胶,90℃下的成胶时间为55h,成胶后弹性模量为16.6Pa,属于高强度冻胶;该冻胶堵剂注入性好,同时具有较好的抗剪切性和耐温抗盐性,封堵率可达96%以上,满足深部调剖对堵剂的要求。

In order to deal with the issue that high strength chromium gel always had high crosslinking speed,the formula of plugging agent was optimized by selecting cationic polymer and using of alumina sol. The chromium gel plugging agent suitable for deep profile control was developed and its performance was evaluated. The results showed that for acrylamide (AM)/ acryloyloxyethyltrimethylammonium chloride(DAC)binary copolymer organic chromium gel,the lower the cationic degree,the longer the gelation time was. Alumina sol could effectively delay the gelation time of cationic polymer chromium gel and improve its strength and long-term stability. The optimum formula of chromium gel system was 0.8% polymer Y5 with 5% cationic degree, 0.3% chromium acetate and 0.2% aluminum sol. The gelation time was 55 h at 90℃ and the elastic modulus was 16.6 Pa,which belonged to high-strength gel. The plugging agent had good injection ability and strong shear resistance. Meanwhile,it had strong temperature and salt resistance,and its blocking rate could reach more than 96%. This plugging agent had long gelation time and strong plugging performance,which could satisfy the requirements of deep profile control.