含氟气湿反转剂的合成与表征

Preparation and Characterization of Fluorine-Containing Gas-Wetting Alteration Agent

采用乳液聚合的方法合成了含氟丙烯酸酯聚合物乳液。红外光谱(FT-IR)对其结构进行分析,发现所有单体参与了反应,产物呈现共聚物结构。接触角测量结果显示,增加含氟单体的含量或应用含氟烷基侧链长的含氟单体合成聚合物,其产生的疏水性较强。含氟丙烯酸酯聚合物处理岩心后,蒸馏水、油田污水、十六烷、原油的接触角分别由2.52°、10.62°、2.2°和35.35°增加到139.79°、122.31°、65.46°和85.68°,表明岩心表面的润湿性由强液湿转变为气湿。毛细管上升实验结果表明,聚合物可以使气/水体系和油/气体系中的接触角分别由60°和32.86°增加到118.36°和76.11°。因此,合成的聚合物可以使毛细管的润湿性发生气湿反转。

The fluorine-containing acrylate copolymer emulsion was prepared with emulsion copolymerization.The structure of the copolymer was determined by Fourier transform infrared（FT-IR） spectroscopy,and the results show that all the monomers polymerize.The results of contact angle（CA） analysis suggest that the polymer has stronger hydrophobicity when the content of fluoromonomer is increased or the fluoromonomer with the longer fluorine-containing sidechain is used.After the emulsion treated the rock,the contact angle of distilled water,oilfield sewage,hexadecane and crude oil increases from 2.52°,10.62°,2.2° and 35.35° to 139.79°,122.31°,65.46° and 85.68°,respectively.And it shows that the rock wettability is altered from strong liquid-wetting to gas-wetting.The results of capillary rise tests indicate that the emulsion can change the contact angles of water/air and oil/air systems from 60° and 32.86° to 118.36° and 76.11°,respectively.So,wettability alteration to gas-wetting can be achieved by the emulsion in capillaries.