新疆油田三元复合驱采出液乳化及破乳影响因素

Emulsification and Demulsification of Produced Liquid from ASP Flooding in Xinjiang Oilfield

斯绍雄 宫兆波 严 忠 王 雨 任召言 刘鹏飞 卜四民

SI Shaoxiong GONG Zhaobo YAN Zhong WANG Yu REN Zhaoyan LIU Pengfei BU Simin

为了明确新疆油田三元复合驱采出液的乳化和破乳机理， 研究了采用驱油剂（弱碱 Na2CO3、 表面活性剂KPS和聚合物 HPAM）和破乳剂室内配制的三元复合驱模拟乳液的乳化和破乳情况。结果表明， 弱碱 Na2CO3浓度对模拟乳液与原油间的界面张力影响最为明显， 当 Na2CO3、 KPS和 HPAM浓度均为 400 mg/L时， 油水界面张力从 13.957 mN/m降至 0.018 mN/m。表面活性剂 KPS对模拟乳液的 Zeta电位降低作用明显， 当表面活性剂加量为 600 mg/L时， 乳液的 Zeta电位从-31.5 mV降至-53.6 mV； 聚合物 HPAM对模拟乳液的黏度影响显著， 而碱和表面活性剂对模拟乳液的黏度影响不明显。低的界面张力、 强的负电性、 高的乳化程度和大的水相黏度共同导致三元复合驱乳液稳定性增强。在三元复合驱乳液的破乳过程中， 油水界面张力和Zeta电位均显著升高， 且升高程度与破乳效果的好坏呈现正相关性。AR型破乳剂对新疆油田三元复合驱采出液的破乳效果最佳。图14参 15

In order to reveal the emulsification and demulsification of the alkali-surfactant-polymer（Na2CO3/KPS/HPAM， ASP） flooding in Xinjiang oilfield， the emulsification and demulsification of the ASP flooding prepared in laboratory were studied. The results showed that the Na2CO3had the most significant effect on the interfacial tension（IFT）between the simulated emulsion and the crude oil. When the Na2CO3， KPS and HPAM contents increased from 0 mg/L to 400 mg/L， the IFT decreased from 13.957 mN/m to 0.018 mN/m. The KPS had a remarkable effect on the decrease of Zeta potential， and the Zeta potential decreased from -31.5 mV to -53.6 mV when the amount of KPS increased from 0 mg/L to 600 mg/L. The HPAM had the most significant effect on the viscosity of the simulated emulsion， while Na2CO3 and KPS didn’ t show the function. The lower IFT， the stronger electronegativity， the higher emulsification and the higher viscosity of the water phase jointly resulted in a highly stable emulsion. In the process of demulsification， the IFT and Zeta potential of the emulsion increased sharply， moreover， the changes of the IFT and Zeta potential were positively correlated with the effect of demulsification. AR type demulsifier could produced the best of demulsification effect in treating the ASP flooding from Xinjiang oilfield

10.19346/j.cnki.1000-4092.2018.01.026