Gemini型阳离子/阴离子表面活性剂胶束体系的流变特性

Rheological Properties of Cationic / Anionic Gemini Surfactant Micelle System

翟 文 刘玉婷 邱晓惠 刘 萍 王丽伟 许 可

ZHAI Wen LIU Yuting QIU Xiaohui LIU Ping WANG Liwei XU Ke

为了提高 Gemini表面活性剂体系的性能，研究了 Gemini型阳离子表面活性剂丙撑基双（十八烷基二甲基氯化铵）（G3-18）、阴离子型表面活性剂α-烯基磺酸钠（AOS）和水杨酸钠（NaSal）复配形成胶束体系的流变特性，考察了复配体系的流动性、黏弹性、触变性和耐温性能。结果表明，3% G3-18+1.5% NaSal体系具有较好的流动性、黏弹性和触变性，在 100℃、170 s-1条件下恒剪切 90 min，保留黏度为 30.83 mPa·s。随着 AOS质量分数增加，3% G3-18+1.5% NaSal与 AOS复配体系在 0.01～ 10 Hz范围内黏性占主导的频率区间增加，弹性占主导的频率区间减小；同时，AOS质量分数增加使复配体系的应力过冲现象不断减弱，正触变环逐渐变小，反触变环逐渐变大。3% G3-18+0.20% AOS+1.5% NaSal 的复配体系在 100℃、170 s-1条件下恒剪切 90 min，保留黏度为 40.57mPa·s，比不加 AOS体系的保留黏度提高了 31.6%。图 16表 1参 12

In order to improve the performance of the clean fracturing fluid systems，the rheological properties of the micelle systems formed by cationic Gemini G3-18，anionic surfactant sodium（AOS）and sodium salicylate（NaSal）were investigated. The fluidity，viscoelasticity，thixotropy and temperature resistance of the systems was measured. The results showed that the 3% G3-18+ 1.5% NaSal system possessed good fluidity，viscoelasticity and thixotropy. After being sheared for 90 min at the temperature of 100℃ and at the shear rate of 170 s-1，the viscosity of the system was 30.83 mPa·s. The viscous dominant frequency interval of 3% G3-18+1.5% NaSal+ AOS complex system increased while the elasticity dominant frequency interval reduced with increasing mass fraction of AOS in the range of 0.01—10 Hz. At the same time，the positive thixotropic ring gradually became smaller and the reverse thixotropic loop increased gradually with the AOS increased. After being sheared for 90 min at the temperature of 100℃ and at the shear rate of 170 s-1，the viscosity of the 3% G3-18+1.5% NaSal+0.20%AOS mixture system remained 40.57 mPa·s，which was enhanced by 31.6% compared to that of the system without AOS.