Investigation on oil-water interfacial property and emulsion stability of crosslink-polymer flooding produced water in Shengli tuo11 south oilfield

Interfacial properties of Shengli Tuo11 south model oil and produced water were investigated with interfacial tensionmeter,interfacial viscoelastometer and Zeta potential instrument.Meanwhile,the effects of the polymer,crosslinker and weak gel concentrations on interfacial property and emulsion stability were also studied in this thesis.When a certain amount of polymer and weak gel was added into the stimulation water,the interfacial tension and the interfacial shear viscosity both increase for the stimulation water phase and model oil.Meanwhile,the absolute value of the Zeta potential of the surfaces of the oil droplets increases also.The stability of water-in-oil and oil-in-water emulsion,both formed by crude oil and stimulation water containing the polymer and weak gel,would enhance as the concentration of the polymer and wek gel increases.The influences of crosslinker on interfacial properties and the stability of emulsion of model oil and the stimulation water were very small.