无碱二元复合体系界面张力影响因素研究

Study on Influence Factors of Interfacial Tension of Alkali-free Binary Composite System

探讨了了表面活性剂浓度、聚合物浓度、温度、二价离子、矿化度等因素对表面活性剂体系界面特性的影响。评价该新型无碱二元复合体系界面张力能够达到10-3数量级的油藏应用条件。研究结果表明：二元复合体系在很低的活性剂浓度（0.005%）与原油间的界面张力达到超低;聚合物浓度对二元体系与原油间的界面张力影响较大;配制二元体系用水中矿化度、二价离子对复合体系界面张力影响不大,该活性剂能够适合于较高矿化度或者二价离子浓度含量较高的油层;温度对二元复合体系的界面张力基本无影响,在45-80℃范围区间内均可以达到超低。

The influence of surfactant concentration, polymer concentration, temperature, divalent ions, salinity and other factors on the surfactant system interface was discussed. Application conditions of new alkali-free binary composite system with interfacial tension of 10-3 magnitude were evaluated. The results show that, the interfacial tension between crude oil and the binary composite system can reach to ultralow when the surfactant concentration is at low surfactant concentration （0.005%）. Polymer concentration has greater impact on the interracial tension. The mineralization degree and two-valence ions have little effect on the interracial tension of the composite system. The active agent can be adapted to the reservoir with high salinity or high concentrations of divalent ion content. Temperature has no effect on the interfacial tension, and it can reach ultra low in the range of45-80℃.