Molecular film displacement is a new nanofilm EOR technique. A large number of experiments show that the mechanism of molecular film displacement is different from conventional chemical displacement ( polymer,surfaetant, alkali and ASP displacement etc). With water solution acting as transfer medium, molecules of the filming agent develop the force to form films through electrostatic interaction, with efficient molecules deposited on the negatively charged rock surface to form ultrathin films at nanometer scale. This change the properties of reservoir surface and the interaction condition with crude oil, making the oil easily be displaced as the pores swept by the injected fluid. Thus oil recovery is enhanced. The mechanism of molecular filming agent mainly includes absorption,wettability alteration, diffusion and capillary imbibition etc.%分子膜驱是一种新型的纳米膜驱提高原油采收率技术.采用多种实验手段,通过大量实验研究表明,分子膜驱的驱油机理有别于传统的化学驱(聚合物驱、表面活性剂驱、碱驱及其复合驱等方法).它是以水溶液为传递介质,膜剂分子依靠静电相互作用为成膜动力,膜剂有效分子沉积在呈负电性的岩石表面,形成纳米级超薄膜,改变了储层表面性质和与原油的相互作用状态,使得注入流体在冲刷孔隙过程中,原油易于剥落和流动而被驱替液驱替出来,达到提高采收率的目的.分子膜剂作用机理主要表现在吸附作用、润湿性改变、扩散作用、毛细管自吸作用等几个方面.
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