低聚季铵盐在岩心上的吸附行为分析  

Analysis of the Adsorption Behavior of Oligomeric Quaternary Ammonium Salt on Sandstone Surface

作　　者：吴亚[1] 陈世军[1] 徐家业[1] 彭森[2] 吕永恒[2] 

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]中国石化河南油田双河社区服务中心,河南南阳473000

出　　处：《油田化学》2013年第3期358-361,365,共5页Oilfield Chemistry

基　　金：陕西省教育厅专项科研计划基金项目"羟丙基瓜尔胶压裂返排液重复使用技术研究"(项目编号12JK0644)

摘　　要：以环氧氯丙烷、二甲胺和溴代烃为原料合成了低聚季铵盐MD-I和MD-Ⅱ。通过衰减全反射-傅立叶变换红外光谱(ATR-FTIR)、X射线衍射(XRD)、扫描电镜(SEM)分析以及接触角测定研究了MD-I和MD-Ⅱ在天然岩心上的吸附行为。ATR-IR分析表明MD-I和MD-Ⅱ在岩心上均吸附成膜,且分子在膜中具有特定的排列取向;XRD分析表明经MD-I或MD-II处理后岩心晶面间距未发生明显变化,晶形结构未发生改变;SEM照片显示经MD-I处理的岩心表面微观结构未发生明显改变,而经MD-Ⅱ处理的岩心表面有细长突起。接触角测定结果表明油湿表面天然岩心薄片(水接触角为96.7°)分别吸附有两种低聚季铵盐MD-I和MD-II后转变为弱水湿,水在经MD-I或MD-Ⅱ处理后天然岩心表面的接触角分别为34.1°和44.5°,其中MD-I吸附平衡后改变岩石表面润湿性能力更明显。Oligomeric quaternary ammonium salts MD-I and MD-II were synthesized from epichlorohydrin, dimethylamine and bromo hydrocarbons. Adsorption behaviors of the cationic olignmeric quaternary ammonium salt on natural sandstone surface were studied through attenuated total reflectance-Fourier transform infrared spectroscopy （ATR-FTIR）, X ray diffraction （XRD）, scanning electron microscopy （SEM） analysis and the determination of contact angle. ATR-IR analysis showed that MD-I and MD-II were adsorbed on the surface of the sandstone to form thin film, moreover, MD-I and MD-II molecules in the membrane had a specific alignment; X ray diffraction analysis indicated that the crystal plane spacing and the crystalline structure of two treated cores was not significantly changed; Environmental scanning electron microscopy results showed that surface structure of the sandsone treated by MD-I had not significantly altered, however, the surface of the sandstone treated by MD-II gave some slender materials. And oil wet surface of natural sandstone slice （water contact angle of 96.7° ） adsorbed by two aqueous oligomeric quaternary ammonium salt MD-I and MD-II, respectively, turned to be water-wet （water contact angle of 34.1° and 44.5° , respectively）, thereinto, after adsorption equilibrium, MD-I could change the wettability of surface of the sandstone more obviously.

关 键 词：低聚季铵盐 分子膜 吸附 分析 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]