【作者】 唐全武； 王犁； 鲁红升； 黄志宇；

【Author】 Quanwu Tang;Li Wang;Hongsheng Lu;Zhiyu Huang;College of Chemistry and Chemical Engineering, Southwest Petroleum University;Engineering Research Center of Oilfield Chemistry, Ministry of Education;Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province;

【机构】 西南石油大学化学化工学院； 油田化学教育部工程研究中心； 油气田应用化学四川省重点实验室；

【摘要】 当前,较传统的表面活性剂(比如,阳离子、阴离子、非离子和两性离子表面活性剂)而言,开关表面活性剂因其在恰当的外部刺激下能够实现表活性的"开"与"关",受到国内外极大的关注。基于开关表面活性剂理论,本文报道一种新颖的以蠕虫胶束稳定的二氧化碳刺激响应泡沫,即利用二氧化碳触发,使长碳链叔胺(DOAPA)具备良好的表活性,进而与反离子例如水杨酸钠(NaSal)作用形成蠕虫胶束,可以制备稳定的二氧化碳刺激响应泡沫,并有望应用于煤层气二氧化碳泡沫压裂技术。研究表明,采用单一DOAPA(100 mM)制备的泡沫稳定性欠佳,但是以摩尔比1:1地引入NaSal,促进蠕虫胶束的形成,则可得到稳定性较好的泡沫,且加入碱(NaOH或NH3·H2O)可关闭表面活性剂,达到分离DOAPA,实现其再生与重复利用。冷冻透射电镜图像显示,在二氧化碳触发下,DOAPA与NaSal可在泡沫连续相中形成蠕虫胶束,赋予泡沫液膜以粘弹性,有利于减缓液膜排液,抑制泡沫聚并,从而稳定泡沫,其内在作用机制可以通过1HNMR、DLS以及泡沫形态与半衰期等加以解释。更多还原

【Abstract】 Nowadays,unlike traditional cationic,anionic,nonionic and zwitterionic surfactants,switchable surfactants which can be reversibly switched itself"on"and"off"via external stimuli,have attracted much attention.Based on the theory of switchable surfactants,a novel CO₂-in-water foam which might be expected to be a practical fracturing fluid for coalbed methane extraction will be reported in this study,where CO₂ triggered-DOAPA showed excellent surface activity,and then DOAPA with NaSal at molar ratio 1:1 （100 m M） in the presence of CO₂ could form wormlike micelles which had been used to stabilized the CO₂-in-water foam.It was found that DOAPA-stabilized CO₂-in-water foam is not enough stable,but the CO₂-in-water foam stabilized with the wormlike micelles showed better stability than DOAPA-stabilized CO₂-in-water foam.Moreover,using NaOH or NH₃·H₂O,DOAPA might be renewed and recycled.The images of cryogenic transmission electron microscopy further demonstrated that the wormlike micelles formed in the solution of DOAPA and NaSal with CO₂,which gave the foam viscous thick lamellae.The foam drainage slowed and the CO₂ gas diffusion through foam film would be suppressed,so the CO₂-in-water foam stabilized with the wormlike micelles became stable.Studies on ¹HNMR,DLS,and morphology and half-life of foams were performed to understand the mechanism of CO₂-in-water foams stabilization depending on wormlike micelles.更多还原