固体颗粒对O/W乳状液稳定性的影响

The Influences of Solid Particles on O/W Emulsion Stability

采用表面张力仪、界面黏弹性仪和Zeta电位仪,研究了大庆油田三元复合驱采出水中的固体颗粒(纳米SiO2、钠基蒙脱土)与驱油剂(碱、表面活性剂、聚合物)作用对油水界面性质及乳状液稳定性的影响。结果表明,固体颗粒与NaOH作用使得油滴表面Zeta电位绝对值增大;固体颗粒与烷基苯磺酸盐作用,油水界面张力增大,水相固体颗粒使得油水界面剪切黏度减小;固体颗粒与HPAM作用使得油滴表面Zeta电位绝对值明显增大。固体颗粒与碱作用时,其低质量浓度不利于O/W乳状液的稳定,而高质量浓度(800mg/L)则有利于O/W乳状液的稳定;固体颗粒与烷基苯磺酸盐作用使得O/W乳状液稳定性增加,而与HPAM作用则减小O/W乳状液的稳定性。

Using surface tensiometer ,interfacial shear viscosity meter and Zeta potentiometer to analyze the effects on the interfacial properties and emulsion stability when the solid particles （Nano SiO2 ,Na-MMT） in the Daqing oilfield ASP flooding were together with the oil displacement agents（Alkali ,Surfactant ,Polymer） .The results show that the absolute value of Zeta potential on the oil droplet surface increases when adding solid particles to the alkali solution .Adding solid particals to the alkylbenzenesulfonate solution ,the interfacial tension increases and the interfacial shear viscosity decreases .The absolute value of Zeta potential on the oil droplet surface increases significantly after adding solid particles to HPAM solution .After adding solid particles to alkali solution ,low concentration will worsen the stability of O/W emulsion ,whereas high concentration（800 mg/L）will be helpful for the stability of O/W emulsion .After adding solid particles ,the stability of O/W emulsion formed by thealkylbenzenesulfonate solution and simulated crude oil decreases ,but the stability of O/W emulsion formed by HPAM solution and simulated crude oil becomes worse .