驱油体系化学剂间相互作用对界面吸附膜的影响

Effect of Interactions Among Flooding Chemicals on Interfacial Properties of Adsorption Film

采用界面张力弛豫技术研究了不对称Gemini表面活性剂C12COONa-p-C9SO3Na、部分水解聚丙烯酰胺Mo-4000和疏水缔合水溶性聚丙烯酰胺(HMPAM)等驱油体系化学剂在癸烷/水界面上的扩张流变性质,考察了不同离子强度和不同类型电解质对体系界面流变性质的影响,计算得到界面扩张弹性模量和粘性模量的全频率谱,并通过归一化方法(Cole-cole图)探讨了界面吸附膜的弛豫过程.研究发现,界面膜内分子重排和界面与体相间分子扩散交换是影响膜性质的主要弛豫过程.表面活性剂体相浓度增大有利于界面分子重排过程,而低频有利于扩散交换过程;不同结构聚合物以及不同离子强度和不同类型电解质对表面活性剂吸附膜有不同的影响.

The dilational viscoelastic properties of Gemini surfactant C12COONa-p-C9SO3Na,partly hydrolyzed polyacrylamide Mo-400,hydrophobically modified polyacrylamide（HMPAM） were investigated at the decane-water interface by means of interfacial tension relaxation.The effects of different type electrolytes and ionic strength on interfacial dilational properties were exploited.The dilational elasticity and dilational viscosity were calculated at different frequencies and the relaxation processes were discussed by plotting Cole-cole curves.The experimental results show that in-film molecular reorientation process and molecular diffusion-exchange between the interface and the bulk are two main processes controlling the nature of film.The increase of surfactant concentration will enhance molecular reorientation process,while molecular diffusion-exchange process will dominate adsorption film at low frequency.The influences on dilational properties of surfactant film depend on the structure of polymer,ionic strength and ionic type.