纳米纤维素对两性蠕虫胶束线性黏弹性的影响

对两性蠕虫胶束（Z-WLM）溶液添加不同类型纳米纤维素（NCs）后的耐温性能进行了研究，并通过线性流变学方法分析了不同浓度的NCs对Z-WLM的动态黏弹性、触变性、蠕变性等流变行为的影响。研究结果表明，质量分数为4wt%的芥酸酰胺丙基二甲基甜菜碱表面活性剂溶液可形成蠕虫胶束（WLM）结构，具有剪切稀释性、黏弹性、蠕变性及良好的触变回复性等特性。与其它类型NCs相比，长径比大、羧基含量高的NCs对WLM溶液拥有更好的增黏作用，同时可增加体系的松弛时间、弹性模量，延长其剪切黏度及动态模量触变回复时间，改善其蠕变回复性和耐温性，适用于70~100℃的中高温油藏增产作业使用。随着NCs添加量的增加，复合体系的黏弹性和蠕变回复性增强，触变回复性减弱。 

Effect of nanocellulose on linear viscoelastic behavior of zwitterionic wormlike micelle

The thermal stability of zwitterionic wormlike micelle(Z-WLM) solution with different nanocelluloses(NCs) was investigated. The effects of NCs concentration on the dynamic viscoelastic behavior, thixotropy and creep of Z-WLM were studied by linear rheological methods. The experimental result shows that a wormlike micelle(WLM) structure is formed by 4wt% erucy lamidopropyl betaine surfactant solution with many unique rheological properties, including shear thinning behavior, viscoelastic behavior, creep behavior and higher thixotropy recovery behavior, et al. Compared to other NCs, the NCs with high -COOH mass fraction and large aspect ratio possess better thickening efficiency. Moreover, the NCs can increase the Z-WLM solution's relaxation time and storage modulus, extend its thixotropy recovery time of shear viscosity and dynamic modulus, improve its creep recovery performance and thermal stability, which can use as a stimulation fluid in high temperature reservoirs from 70℃ to 100℃. With the increase of NCs concentration, the viscoelasticity and creep recovery performance of composite systems are increased and its thixotropy recovery performance is decreased.