Investigation on oil-water interfacial properties and emulsion stability of polymer flooding produced water in Shengli oilfield

Interfacial properties of Shengli Tuoyi model oil and produced oil water were investigated with interfacial tensionmeter,interfacial viscoelastometer and Zeta potential instrument.Meanwhile,the effects of HPAM 3530S concentration on interfacial properties and emulsion stability were also researched.The results indicate that both the interfacial tension and the interfacial shear viscosity between model oil and filtered produced oil water decrease because of suspended solids in the produced oil water.Then a certain amount of HPAM 3530S was added into the stimulation water.The results show that the interfacial tension and the interfacial shear viscosity between stimulation water phase and model oil increase.Likewise,the absolute value of the Zeta potential of the surfaces of the oil droplets increases.The stability of water-in-oil emulsion,formed by crude oil and stimulation water containing HPAM 3530S,enhances firstly and then reduces with the increase in concentrations of HPAM 3530S.Certainly,a proper concentration of HPAM 3530S exists and the emulsion would be the most stable under this concentration.