乳液型聚合凝胶调驱体系性能评价

Performance Evaluation of Emulsion Polymerization Gel Control System

易文君 刘文辉 李 翔 铁磊磊 侯吉瑞 赵凤兰

YI Wenjun LIU Wenhui LI Xiang TIE Leilei HOU Jirui ZHAO Fenglan

为了提高海上油田的驱油效率、满足海上平台作业要求，通过测定乳液型聚合物溶液和凝胶体系的黏度随时间的变化，得到适合海上油田深部调驱的乳液型聚合物凝胶体系；通过长度为1 m的填砂模型封堵实验和均质岩心驱油实验，研究乳液型聚合物凝胶的封堵性和驱油效果。结果表明，乳液型聚合物的稳定性较好，溶液放置31d后的黏度保留率为71.15%。由两种酚醛类交联剂和乳液型聚合物组成的聚合物凝胶成胶时间为8 d，成胶黏度为911 mPa·s，稳定性良好。水驱和聚合物驱注入速率为5 m/d时，填砂模型封堵效果相对较好，沿程封堵率均超过90%。岩心驱油实验中，渗透率5000×10-3μm2岩心的采出程度增幅比渗透率为1000×10-3μm2和3000×10-3μm2的岩心高12.46%和3.83%，聚合物凝胶体系可以进入油藏深部实现高渗条件下的深部调驱，改善水驱效果。图4表4参19

In order to improve the oil displacement efficiency of offshore oilfields and meet the operational requirements of offshore platforms，an emulsion polymer gel system suitable for deep flooding of offshore oilfields was obtained by measuring the viscosity of emulsion polymer solution and gel system with time. The sealing performance and oil displacement effect of the emulsion polymer gel were studied by a sand-filling model plugging experiment with a length of 1 m and a homogeneous core flooding experiment. The results showed that the stability of the emulsion polymer was good，and the viscosity retention was 71.15% after the solution was placed for 31 days. The polymer gel consisting of two phenolic cross-linking agents and an emulsion polymer had a gelation time of 8 days and a gelling viscosity of 911 mPa·s indicating good stability. When the injection rate of water flooding and polymer flooding was 5 m/d，the plugging effect of the sand filling model was relatively good，and the plugging rate along the sandpack was more than 90%. In the core flooding experiment，the recovery degree increment of the core with a permeability of 5000×10-3μm2 was 12.46% and 3.83% higher than that of 1000×10-3μm2and 3000×10-3μm2. Therefore，the polymer gel system couldenter the deep part of the reservoir to achieve deep adjustment and drive under high permeability conditions，and improve the effectof water flooding.

10.19346/j.cnki.1000-4092.2019.02.009