关键词: 聚合物纳米微球, 膨胀倍数, 阻力系数, 残余阻力系数

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