阴阳离子表面活性剂复配型泡排剂的性能

Anionic-cationic Surfactant Compound Foaming

摘要:

该文运用阴阳离子表面活性剂复配体系具有协同效应和形成囊泡使泡沫稳定性增加的特点，优选出一类新型的用于气井泡沫排水的复配型泡排剂。结果表明当阳离子表面活性剂的碳链长度小于16时，碳链越长，泡沫稳定性越好。利用正交实验设计，得到最佳质量比为SDS(十二烷基硫酸钠):AOS(烯烃磺酸钠):AES(脂肪醇聚氧乙烯醚硫酸盐):CTAB(十六烷基三甲基溴化铵)=1:2:2:2，半衰期接近SDS的4倍，引入聚氧乙烯链使泡沫稳定性增加。在一定Na+浓度范围内，体系泡沫黏度最大值为112mPa•s，半衰期最大值为50min；但Ca2+使体系容易形成沉淀，泡沫的性能变差。体系10min时的泡沫携液体积为126.5mL，与甲醇的配伍性好。

Abstract:

In this paper, we choose the compound foaming agent system with better stability using a synergistic effect of the mixed system of anion and cation surfactant, and characteristics of formation of vesicles that foam stability increased. It is found that when the carbon chain length is less than 16, The longer the carbon chain, the better stability of foam. We have obtained the systems by means of orthogonal experimental design, the optimal mixture ratio of the system is SDS(Sodium Lauryl SulfateSodium Dodecyl Sulfate):AOS(Sodium Alpha-olefin Sulfonate):AES(Sodium Alcohol Ether Sulphate):CTAB(Hexadecyl trimethyl ammonium Bromide)=1:2:2:2,whose the half-life is nearly 4 times than SDS’s, and the polyoxyethylene chain makes the foam stability increase. At the same time, it is also found that The maximum value of the foam viscosity is 112mPa•s in a certain concentration of Na+, and The maximum value of the half-time is 50min. But it is easy to precipitate in the condition of Ca2+, and the foam performance will be worse. Through experimental evaluation, the mixed system showed the better salt-resistance, liquid carrying capacity and compatibility with methanol.