Influence of the interaction between surfactants and sepiolite on the rheological properties and thermal stability of organo-sepiolite in oil-based drilling fluids
Influence of the interaction between surfactants and sepiolite on the rheological properties and thermal stability of organo-sepiolite in oil-based drilling fluids
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DOI：
10.1016/j.micromeso.2018.06.017
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Guanzheng Zhuang;Zepeng Zhang;Huiwen Chen
中科院分区：
文献类型：
--
作者：
Guanzheng Zhuang;Zepeng Zhang;Huiwen Chen
研究了有机表面活性剂与海泡石（Sep）的相互作用对有机海泡石（OSep）结构和油基钻井液流变性的影响。采用三种阳离子表面活性剂对Sep进行改性。采用X射线衍射、扫描电子显微镜、表面性质、热分析和X射线光电子能谱（XPS）表征了OSep的结构和表面活性剂与OSep的相互作用，采用凝胶体积和动态流变行为评价了OSep/油体系的流变性能。有机改性后的OSep保持了海泡石的晶体结构，纤维更加分散。XPS结果表明，有机表面活性剂与海泡石之间存在电子相互作用。表面活性剂通过部分插入和覆盖的方式堵塞海泡石的微孔，导致比表面积下降。表面活性剂的尺寸对插入通道起着重要作用。表面活性剂的部分插入使OSep在油基钻井液中具有更好的流变性和热稳定性。
The influence of interaction between organic surfactants and sepiolite (Sep) on the structure and rheological properties of organo-sepiolite (OSep) in oil-based drilling fluids was investigated. Sep was modified with three kinds of cationic surfactant. X-ray diffraction, scanning electron microscope, surface properties, thermal analysis and X-ray photoelectron spectroscopy (XPS) were applied to characterize the structures of OSep and interaction between surfactants and Sep. Gel volume and dynamic rheological behavior were used to appraise the rheological properties of OSep/oil fluids. OSep keeps the crystal structure of sepiolite after organic modification and shows the more dispersed fibers. XPS results demonstrated that organic surfactants are in electronic interaction with sepiolite. Surfactants block the micropores of sepiolite by partially inserting and covering, resulting in the decrease of specific surface area. The size of the surfactants plays an important role to insert the channels. The partially insertion of surfactants into the channels leads to better rheological properties and thermal stability of OSep in oil-based drilling fluids.