Experiments research of polymer solution viscoelasticity

Abstract

The rheological characteristic of polymer solution directly influences the oil displacement efficiency in the process of polymer flooding, and it is necessary that rheological characteristics of polymer solution used in polymer flooding are researched. Loss modulus and storage modulus of polymer solution with different mass concentration and relative molecular mass are studied and the relationship between them is analyzed through steady and dynamic shear experiments. The first normal stress difference at low angular rate is calculated based on loss modulus and storage modulus, and combined with the first normal stress difference obtained by steady shear flow experiments at high shear rate. The first normal stress differences at a wider range of shear rate can be obtained and the relationship between the first normal stress difference and shear rate is set up. The results show that the relationship established between the first normal stress difference and shear rate at wide range shear rate is feasible. The higher the mass concentration or the relative molecular mass of polymer solution is, the higher the first normal stress difference coefficient is.

Keywords

polymer solution / rheological characteristic / viscoelasticity / shear flowing / first normal stress difference