Abstract: For the industrial field test of ASP flooding containing NaOH in secondclass reservoir which located in the east fault of Daqing north No.1 Zone, the variation trend of CO₂ content in the center oil well associated gas and the chemical interaction law of ternary system was analyzed. Interfacial tension, viscosity and oil displacement efficiency of the composite ternary system which consisted of sodium hydroxide and sodium carbonate were studied. Ternary system of composite alkali（F21 for short）which was composed of HPAM concentration of 2 000 mg/L, HABS mass fraction of 0.3%, sodium hydrate mass fraction of 0.8% and sodium carbonate mass fraction of 0.3% had a better comprehensive performance. Its equilibrium interfacial tension at 2 h was as low as 6.5×10^-3 mN/m. Its viscosity increased by 28.5% compared with strong alkali system and rised as intensity of composite alkali decreased. Recovery ratio of ternary system of composite alkali（F21 for short）improved by 24.4% compared with water flooding which was similar with strong alkali system chemical flooding. Recovery ratio of heterogeneous model chemical flooding decreased by 2.4% compared with homogeneous model.

Key words: Alkalinesurfactantpolymer flood,    ,  Composite alkali,    ,  Interfacial tension,    ,  Viscosity,    ,  Oil displacement efficiency,   ,  Heterogeneous model

摘要： 针对大庆北一区断东二类油层强碱三元复合驱现场试验, 分析了试验区中心井伴生气中CO2 含量的 变化趋势以及和三元液的化学作用规律, 研究了氢氧化钠和碳酸钠复配三元体系的界面张力、 黏度特性、 驱油效率。 其中 HP AM 质量浓度20 0 0m g / L、 重烷基苯磺酸盐质量分数0. 3%、 氢氧化钠质量分数0. 8%、 碳酸钠质量分数 0 . 4%组成的复合碱三元体系( 简称F 2 1) 综合性能较优。复合碱( F 2 1) 三元体系2h的平衡界面张力低至6. 5×1 0-3 mN /m; 复合碱( F 2 1) 三元体系的黏度比强碱体系增加2 8. 5%, 且三元体系黏度随复合碱强度减弱而升高; 复合碱 ( F 2 1) 三元体系比水驱采收率提高2 4. 4%, 和强碱体系化学驱采收率接近; 非均质模型化学驱采收率比均质模型降 低2. 4%。

关键词: 三元复合驱,   ,  , 复合碱,  ,  , 界面张力,   ,  , 黏度,    ,  , 驱油效率,   ,  , 非均质模型