A Study on Ployacryamide Solution Viscosity Analysis at Low Shear Conditions

At present,the most commonly used polymer is partially hydrolyzed ployacryamide in polymer flooding.Moreover the viscosity of PAM solution is the critical factor of influencing sweep efficiency,which affects the oil production significantly.The viscosity of ployacryamide(PAM) solution is measured by CVRO200 rheometer under low shear rate after different shear time.The results show that the viscosity of PAM solution having the same concentration and hydrolysis degree increases with the molecular weight increasing.The viscosity of ionic PAM solution is far more than that of non-ionic PAM in the case of the same mass concentration.The viscosity of PAM solution decreases significantly with the brine salinity increasing,and ionic PAM is influenced much more seriously than the non-ionic PAM.An increase in temperature and the concentration of sodium hydroxide causes a great reduction of the viscosity of PAM solution,and non-ionic surfactant can lower the viscosity of PAM solution,but the impact is not very serious.Moreover the viscosity of PAM solution reduces obviously with the increase of shear rate and shear time.At the same time,the relevant theoretical interpretation is given.All these might serve definite purpose for the study of oil production.