全过程调剖技术与三元复合驱协同效应的动态特征

三元复合驱技术提高采收率幅度远高于聚合物驱技术，对于高含水、高采出程度的中国东部老油田具有明显的技术优势。但是三元复合驱技术现场应用时，出现明显的"低界面张力窜流"现象，导致三元复合体系渗流阻力系数小、注入压力低、产出液聚合物浓度高的动态特征。以交联聚合物体系为调剖剂的化学驱全过程调剖技术，具有渗流阻力高、波及能力强的特点，可以克服和弥补低界面张力窜流现象，解决三元复合驱过程中的窜流和后续注水快速指进的问题。现场应用结果表明，全过程调剖技术和三元复合驱技术配套应用，产生良好的协同效应，可以在扩大波及体积的基础上大幅度提高驱油效率，取得优异的增油降水效果，最终提高油藏采收率。

Dynamic characteristics of synergistic effect between profile control technology throughout flooding and ASP flooding

As compared with polymer flooding, ASP flooding can achieve rather higher enhanced oil recovery, exhibiting its obvious technical strength while applied to old fields in eastern China with high water cut and high recovery. However, during the onsite application of ASP flooding technology, the obvious phenomenon of low-interfacial-tension breakthrough flow occurs, resulting in the dynamic characteristics of ASP system such as low percolating resistance coefficient, low injecting pressure and high polymer concentration of produced fluid. With the linked polymer system as profile control agent, the profile control technology throughout chemical flooding is characterized by high percolating resistance and strong spread ability, which can overcome and compensate the phenomenon of low-interfacial-tension breakthrough flow as well as solve the problems during ASP flooding such as breakthrough in ASP flooding and subsequent water injection for rapid fingering. The onsite application shows that good synergistic effect is produced by the combined application of ASP flooding technology and profile control throughout flooding, which has considerably improved oil flooding efficiency based on expanding the sweeping volume and thus achieved excellent oil-increase and water-reduction effect, and finally enhanced oil recovery.