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Study on Polymer Nanosphere HP-2 System Used in High Temperature and High Salinity Reservoirs
Ju Ye, Xu Guorui, Tie Leilei, Jia Yongkang, Yang Jinzhou
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.
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