盐水中氨基磺酸型两性表面活性剂二元混合体系协同增效机理

In EOR, surfactant flooding may be one of the most effective solutions to recovery the petroleum resources available all over the world. However, the main bottleneck of application and dissemination for surfactant flooding may be the bad properties of surfactants or their mixtures, e.g. the inefficient surface/interfacial activities, the bad compatibility of surfactants with reservior water (specially including high concentration of inorganic ions), and so on. Taking the binary mixtures containing both amino sulfonate amphoteric surfactants (ASA) and a traditional surfactant as the object of this investigation, the basic science about the mechanism on synergistic effect of the surfactant mixtures systems in brine will be investigated in the present project. The synergistic properties between ASA and other surfactants in brine will be characterized by the technologies of surface/interfacial measurement, fluorescence probe, conductivity measurement, NMR, and so on, which will clarify the mechanism on interaction between inorganic salts and surfactants in the binary mixtures. And then the relationships of the interaction between the molecules will be described by the theoretical models and the mathematical equations established. Once this project be successfully completed, it is of great significance theoretically and technologically to the design of the efficient and effective surfactant formulas, to their performance prediction, and to their applications in many fields.

三次采油中，表面活性剂驱油技术是开采现有石油资源的有效途径之一。然而，表面活性剂及其混合体系不太高效的性能，例如，表/界面活性不高，与高矿化度地层水的配伍性不佳，成为制约该项技术推广应用的主要瓶颈。本课题拟以氨基磺酸型两性表面活性剂与传统表面活性剂的二元混合体系为研究对象，对盐水中二元混合体系协同增效机理进行基础科学研究。利用表/界面测量、荧光探针、电导测量和核磁共振等技术手段，探索盐水中表面活性剂二元混合体系协同性能，揭示无机盐等与混合体系分子间的作用规律，建立理论模型和数学表达来描述分子间相互作用关系。本项目的成功开展，必将为高效性能的表面活性剂配方体系设计、性能预测及应用提供理论和技术依据。

针对表面活性剂驱油剂在提高原油采收率的实际应用中存在的一些问题，开展了表面活性剂配方体系设计与性能研究的一些基础性研究。具体而言，本课题以氨基磺酸型两性表面活性剂的二元混合体系为研究对象，对水溶液和盐水溶液中的二元表面活性剂混合体系分子间相互作用行为进行了研究。采用UV-vis光谱、ITC、电导、张力等测量技术，测定了氨基磺酸型两性表面活性剂与其它常规的表面活性剂（包括离子和非离子表面活性剂）的二元混合体系的溶液性能，揭示了无机盐存在下表面活性剂分子间相互作用的变化规律。基于正规溶液理论和假想分离模型，成功采用Clint模型、Rubingh模型、Rodenas模型、Maeda模型等热力学模型的相关方程对分子间相互作用参数、热力学参数等进行了估算，评价了二元表面活性剂混合体系理想混合和非理想混合的行为差异，探讨了二元表面活性剂混合体系在水溶液和盐水溶液中协同增效作用发生的机制。通过这些研究提出了对表面活性剂配方体系设计、性能预测和应用等方面的一些认识，为进一步开展多元表面活性剂混合体系分子间作用行为的研究、溶液性能评价和在工农业等领域的应用提供了基础数据和理论参考。