选用复配表面活性剂,用水代替柴油作为携带介质,将超疏水的纳米聚硅均匀稳定地分散在水中,制备成水基纳米聚硅乳液.室内试验结果表明:所制备的水基纳米聚硅乳液的分散性和稳定性较好,制备过程简单易行,便于实现工业化生产.粒径为10 nm左右的SiO2微粒在水中分散良好,该乳液遇盐发生破乳,释放出来的纳米聚硅微粒粒径在5～10 nm之间,表面存在亲油性有机链,仍具有较强的亲油性,在柴油、四氯化碳、甲苯中的分散性良好.模拟岩芯驱替试验表明岩芯经水基纳米聚硅乳液处理后,水的流速增大,增注效果显著.%Water-based nanometer polysilica latex was successfully prepared by dispersing superhydrophobic nanometer polysilica in water as the carrying medium for replacement of conventional diesel oil, in the presence of properly formulated composite surfactants. The results of lab tests indicated that the resulting water-based nanometer polysilica latex had good dispersibility and stability, and its preparation process was simple and could be readily used for industrialized production. The nanometer polysilica particulates with a diameter of about 10 nm were steadily dispersed in water, and the water-based nanometer polysilica latex was liable to de-emulsification in the presence of salts. The SiO2 nanoparticls generated via de-emulsification had a grit size range of 5-10 nm and were well dispersed in diesel oil, carbon tetrachloride,and toluene, owing to strong enough residue hydrophilicity. The simulated mimic core driving test results indicated that after the core was treated by water-based nanometer polysilica latex,the augment injection effect was increased, showing very good augmented injection function.
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