通过盐度扫描实验确定了阴离子表面活性剂所形成的微乳液的相变行为与NaCl浓度的相关关系;通过微流控实验研究了Winsor Ⅰ型表面活性剂体系（简称WⅠ体系）的润湿性特征;在此基础上,利用微流控实验剖析了油湿多孔介质中NaCl浓度对WⅠ体系相变行为及渗吸过程的影响。研究表明,油湿多孔介质中,Winsor Ⅰ型微乳液润湿性与WⅠ体系相近,与其他相相比,润湿性最强;润湿铺展与溶解渗吸残余油是WⅠ体系提高渗吸采收率的主要途径;在形成Winsor Ⅰ型微乳液的盐度条件下,NaCl浓度显著影响WⅠ体系的渗吸机制,NaCl浓度越高,渗吸过程越复杂,渗吸效率越高;同时NaCl浓度显著影响WⅠ体系溶解渗吸残余油的能力,NaCl浓度越高,WⅠ体系对渗吸残余油的溶解越强。图16参23
The relationship between NaCl concentration and the phase change behavior of microemulsion of anionic surfactant was characterized by the salinity scan experiments. The wettability of Winsor Ⅰ type surfactant solution (WⅠ solution) and the effect of NaCL concentration on phase change behavior of WI solution and imbibition in oil-wet porous media were investigated by microfluidic experiments in this study. The WⅠ solution and Winsor I type microemulsion are similar in wetting phase with stronger wettability than other phases. Two main mechanisms of WⅠ solution enhancing imbibitions recovery in oil wet porous media are the wetting phase drive and residual oil solubilization. Under the salinity condition of Winsor I type microemulsion, the NaCl concentration has strong impact on the imbibition mechanism of WI solution, the higher the NaCl concentration, the complex the imbibition process and the higher the imbibition efficiency will be. The NaCl concentration has strong impact on the solubilization ability to oil of the WI solution, the higher the NaCl concentration, the stronger the solubility of the WI solution to residual oil will be.
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