关键词: 低渗透油层,   , 流动性,    ,  黏度损失率,    , 界面张力,   , 驱油效果

Abstract: Selection of relative molecular weight was about 1.6×107 to 1.9×107 SNF3640D polymer，Lab researches were carried out on its mobility，viscosity of core porosity，the interfacial tension of the binary combination with betaine surfactant compound system could achieve ultra low and recovery factors. The results show that higher coefficients of resistance and residual resistance are obtained in low permeability layers. Better injection and mobility are demonstrated by the polymer; the viscosity loss rate of this polymer is lower than traditional 7.0×106 low molecular polymer; the combination of the betaine surfactant compound system can attain the ultralow interfacial tension with the oil (10-3 mN/m). Moreover, the chemical flood recovery efficiency of this polymers flooding alone on a natural rock could reach about 7.85 percent, the compound system could reach about 14.75 percent ,which is far higher than traditional polymer of 7.0×106, therefore, this kind of polymer with low permeability reservoir has good matching, it has a certain guidance for low permeability reservoir development.

Key words: Low permeability reservoir,    , Mobility,    , Viscosity loss rate,    , Interfacial tension,   ,  Flooding effect