黏弹性聚合物溶液对盲端类残余油的微观作用机理

Microcosmic displacement mechanism of viscoelastic polymer solution displacing the residual oil at the dead end

通过实验研究了黏弹性聚合物溶液对盲端类残余油的微观作用机理,得出了在油湿状态下,随着聚合物浓度的增加,即随着聚合物溶液弹性的增加,盲端类残余油的驱油效率有所提高;在水湿状态下,聚合物溶液不能提高不可动残余油的驱替效率,但能够提高可动油的驱油效率,即亲水岩心盲端状残余油若要流动,它必须先转变为可动油。

According to the research on the microcosmic displacement mechanism of viscoelastic polymer displacing the residual oil at the dead end, some understandings are established in this thesis. It is thought that under oil wet condition, the oil displacement efficiency for the residual oil at the dead end will increase with the increase in polymer concentration, namely, the increase in elasticity of polymer solution. Under water wet condition, the displacement efficiency of the immobile residual oil can not be increased with the application of polymer solution, but that of the mobile oil can be increased. That means, if the residual oil at the dead end of the water wet cores flows, it must change into mobile oil earlier.