阴非离子表面活性剂的合成及其作为渗吸剂的性能研究

Synthesis of anionic nonionic surfactants and their properties as imbibition agent

以辛基酚聚氧乙烯醚和马来酸酐为原料、对苯甲磺酸为催化剂,合成一种可提高致密油压裂液体系渗吸效率的阴非离子表面活性剂BGT-16。通过红外光谱和核磁共振氢谱对BGT-16分子结构进行表征,并对BGT-16的表界面张力、临界胶束浓度、润湿性能、自发渗吸效率等性能进行了测试。结果表明,质量分数为0.3%的BGT-16的表面张力为33.88 mN/m、界面张力为3.52 mN/m、CMC为1.19×10^(-4)mol/L,其γCMC为33.66 mN/m,具备良好的表面活性,对疏水载玻片具有良好的润湿性能;合成的BGT-16的渗吸效率受高盐环境影响较小、适用范围广。

Using octylphenol polyoxyethylene ether and maleic anhydride as raw materials,and p-benzene sulfonate as catalyst,an anionic nonionic surfactant(BGT-16)which can improve imbibition efficiency of tight oil fracturing liquid system is synthesized.The molecular structure of BGT-16 is characterized by means of infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy,and the surface interfacial tension,critical micelle concentration,wettability and spontaneous imbibition efficiency of BGT-16 are also tested.It is shown from the results that BGT-16 with a mass fraction of 0.3%has a surface tension of 33.88 mN·m^(-1),an interfacial tension of 3.52 mN·m^(-1),a CMC of 1.19×10^(-4)mol·L^(-1),and aγCMC of 33.66 mN·m^(-1),which shows a good surface activity and a good wettability for hydrophobic slides.Moreover,the imbibition efficiency of the synthesized BGT-16 is less affected by the high salt environment and has a wide application range.