磷硅酸盐/表面活性剂/聚合物复合体系性能评价

Performance evaluation of phosphorus silicate,surfactant and polymer combination system

三元复合体系中的强碱作用使井筒和地面输油设备结垢严重,并且由于层间和层内矛盾日趋严重,注入过程易发生指进。为此,利用磷硅酸盐助剂、聚合物和表面活性剂组成复合体系,对复合体系的界面张力、粘度、分流能力和驱油效果进行了研究。当表面活性剂质量分数为0.05%～0.4%,磷硅酸盐助剂质量分数为0.1%～0.8%时,复合体系的界面张力达到10-2～10-3mN/m数量级,具有较好的低界面张力范围。在物理模型上进行了分流能力和驱油实验。结果表明,磷硅酸盐助剂可以改善驱油体系的调剖能力,可在水驱基础上提高采收率35.9%,优于大庆现有的三元复合驱油体系。

The alkali of ASP system builds serious scaling occurrence in wellhore and oil transfer facilities,moreover,the finger advance is easy to happen in the injection process owing to the intrafor-malional and interlamination contradictory. Using phosphorus silicate adjuvant,polymer and surfactant to form the combination flooding system,and the inlerfacial tension,viscosity,diffluence ability and the flooding effect of the system were researched. When the surfactant is 0.05wt% to 0. 2wt% and the phosphorus silicate adjuvant is 1wt% to 0. 8wt% ,the interfacial tension of the combination flooding system can reach 10-2 to 10-3 mN/m in quantity degree,which shows the inlerfacial tension is favorable. On the physical model,the diffluence and flooding experiments results indicate that the phosphorus silicate adjuvant can improve the profile control ability of the flooding system and can enhance 35.9% of recovery efficiency.It is much better than the existing ASP system applied in Oaqing Oilfield.