The impact study of cation on the viscosity retention rate of Bohai oil field polymer solution after shearing

According to the viscosity retention rate result of polymer solution after shearing,analysis the ion composition of sewage and water from source,research the effect on viscosity retention rate of cationic to polymer solution after shearing.The results showed that the adverse effect is highest of Mg2+on viscosity retention rate,when the concentration of Mg2+in water is 150 mg/L,viscosity retention rate is 45.4%.When the concentration of Ca2+in water is 150 mg/L,viscosity retention rate is 60.1%.When compared to Mg2+and Ca2+,has little effect on Na+ to viscosity retention rate,when the concentration of Na+ is 3 000 mg/L in water,viscosity retention rate is 69.1%.In theory investigate the reason that ion kind produce effect on viscosity retention rate.