pH值和盐度对阴离子蠕虫胶束/纳米流体流变性的影响  

Effect of pH Value and Salinity on Rheological Properties of Carbon Nanotubes/Wormlike Micelle Solution

作　　者：秦文龙 姜关锋 梁国琦 李冉 杨江 

机构地区：[1]西安石油大学陕西省油气田特种增产技术重点实验室,陕西西安710065

出　　处：《石油学报（石油加工）》2017年第5期985-991,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51304159和51174163);陕西省自然科学基金项目(2014JM7251);陕西省科技统筹创新计划项目(2016KTZDGY09-06-01)资助

摘　　要：采用流变学方法考察了pH值和盐度对一种阴离子蠕虫胶束/纳米流体流变性能的影响,并结合Zeta电位测试方法探讨了蠕虫胶束与纳米碳管的相互作用机制。结果表明,3.0%(质量分数)的N-甲基油酰氨基乙基磺酸钠(JXJ209)在3.0%(质量分数)的KCl盐水中可以形成pH响应型蠕虫胶束流体。在pH值为7.0~10.0、KCl质量分数为3.0%~7.0%的条件下,该体系可形成强度较高的胶束网络结构,零剪切黏度可达2.5~5.3Pa·s。随着溶液中KCl质量分数的增加,羟基化的纳米碳管(MWNT-OH)在表面活性剂JXJ209溶液中的分散稳定性随之降低,并且在酸性区(pH<7.0)和强碱性区(pH>12.0)降低幅度更显著。由于MWNT-OH在低盐度和碱性条件下在JXJ209溶液中具有较好的分散稳定性,因而在此条件下MWNT-OH对阴离子蠕虫胶束流体的黏性和弹性表现出较好的改善作用。随着温度的上升,该复合流体的黏度逐渐降低,70℃下其零剪切黏度仍能保持50mPa·s以上,表现出较好的应用潜力。The effects of salinity and pH on rheological properties of a nano-fluid containing anionic wormlike micelle were studied by rheological measurements.The interaction mechanisms between wormlike micelle and carbon nanotube were investigated by zeta potential measurements.The results showed that a pH-responsive wormlike micelle system was formed by 3.0%sodium-methylN-oleoylaminoethylsalfonate（JXJ209）dissolved in 3.0% brine with potassium chloride（KCl）.At the value of pH range from 7.0-10.0 and the salinity range from 3.0%-7.0%,the strong micelle network structures can be formed and the value of zero-shear viscosity of the solution can reach to 2.5-5.3 Pa·s.The dispersion stability of hydroxyl functionalized multi-walled carbon nanotubes（MWNT-OH）in surfactant solutions with JXJ209 was decreased with the increase of salinity.The decrease was more significant under the condition of acidity（pH7.0）or strong alkaline（pH12.0）.The MWNT-OH can obviously improve the viscosity and elasticity of anionic wormlike micelle solution under the conditions of low salinity and alkaline because the MWNT-OH is more stable under the same condition.The zero-shear viscosity of the composite fluids decreased gradually with the increase of temperature and it was still more than 50 mPa·s at 70℃,showing a good application potential.

关 键 词：纳米流体 阴离子表面活性剂 pH响应型蠕虫状胶束 盐度 分散稳定性 流变学 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]