Abstract: Aiming at the problem that the weak gel system has poor effect on the high temperature and high salinity reservoirs, a kind of polymer nanosphere HP-2 system with temperature resistance and salt tolerance was developed. The particle size distribution and morphology of HP-2 were evaluated by laser particle size analyzer and optical microscope. The water absorption expansion curve of HP-2 was studied by using swelling ratio as the evaluation index. Finally the plugging, anti erosion and profile control performance of polymer nanosphere HP-2 were evaluated using homogeneous cores and heterogeneous cores. The results showed that the polymer nanosphere HP-2 with an average particle size of 407.2 nm were spherical particles with high sphericity. The water swelling ratio of HP-2 was 34.1 g/g in the high temperature (90 ℃) and high salinity (97 686 mg/L) reservoir. The results of three layers heterogeneous core flooding experiments show that the polymer nanosphere HP-2 system can enhance the oil recovery rate by 17.3% on the basis of water flooding recovery. The polymer nanosphere HP-2 system has wide application prospects in high temperature and high salinity reservoirs.

Key words: Polymer nanosphere, Swelling ratio, Resistance coefficient, Residual resistance coefficient

摘要： 针对弱凝胶体系在高温高矿化度油藏调驱效果差的问题,研制了一种耐温耐盐的聚合物纳米微球 HP-2体系,利用激光粒度分析仪和光学显微镜评价了HP-2的微观形貌和粒径分布,并以膨胀倍数为评价指标研究了HP-2的吸水膨胀曲线,分别利用均质岩心和非均质岩心评价了聚合物纳米微球HP-2的封堵、耐冲刷以及调驱性能。结果表明,平均粒径为407.2nm 的聚合物纳米微球HP-2为圆球度很高的球形颗粒,在高温(90℃)高矿化度 (97686mg/L)油藏的吸水膨胀倍数为34.1g/g。三层非均质岩心调驱实验结果表明,聚合物纳米微球HP-2体系可在水驱采收率基础上提高采收率幅度达17.3%。该聚合物纳米微球HP-2体系在高温高矿化度油藏应用前景广阔。

关键词: 聚合物纳米微球, 膨胀倍数, 阻力系数, 残余阻力系数