两亲聚合物溶液聚集体调控用于增强乳化的方法及机理研究

Aggregation formed in amphiphilic polymer solutions has plays an important role in enlarging the swept volume and improving oil displacement efficiency in chemical flooding process. Aimed at how to control the aggregation in amphiphilic polymer solutions and enhance the emulsification effect, a series of amphiphilic polymers with different molecular structures for enhancing oil recovery are designed. DLS, AFM, TEM, fluorescence probe and rheology are employed to study the influence of molecular structure of amphiphilic polymer, supermolecule inclusion, surfactant, environmental factors (such as salinity, temperature and pH value) and porous medium on aggregation control of amphiphilic polymer solutions systematically. Influence of aggregation control on emulsification performance for stimulant oil as well as crude oil are studied to explain the mechanism on enhancing emulsification by aggregation control and the stability mechanism of emulsions stabilized by amphiphilic polymers. The dynamic emulsification process can be studied by visual rheometer and stability analyzer, combined with the visual oil displacement experiments and the emulsification effect analysis of the produced liquid from amphiphilic polymer flooding, kinetic model of the dynamic emulsification process can be established. By the study mentioned above, these research can reveal the inner link between aggregation control and emulsification performance, as well as the microcosmic mechanism of emulsification. The microcosmic aggregation control and macroscopical emulsification control can be achieved by the above research and thus provide the scientific basis for designing efficient oil displacement agents and studying oil displacement mechanisms.

两亲聚合物溶液的聚集体对化学驱体系扩大波及体积及提高洗油效率具有重要作用。针对两亲聚合物驱油剂聚集体的调控作用及增强乳化问题，设计合成系列不同分子结构的两亲聚合物驱油剂，采用DLS、AFM、TEM、荧光标记、流变等方法系统研究两亲聚合物分子结构、超分子包结作用、表面活性剂、环境因素（矿化度、温度、pH值）及多孔介质对聚集体的影响规律及其调控作用。研究两亲聚合物聚集体调控对乳化模拟油及原油等的影响，阐明两亲聚合物聚集体调控增强乳化作用机理及乳状液的稳定机理。采用可视流变仪及稳定性分析仪研究两亲聚合物乳化油的动力学过程，结合可视化微观实验对驱替后残余油乳化效果分析，建立乳化过程的动力学模型，揭示聚集体调控与乳化的内在联系，深化乳化作用的微观机理，实现微观上聚集体可调及宏观上乳化可控的目标，为高效驱油剂研制及驱油机理研究提供科学依据。

两亲聚合物是一种由于亲水性分子链上带有疏水基团从而具有两亲性能的水溶性聚合物。由于疏水基团的缔合作用，两亲聚合物能够在溶液中形成聚集体对化学驱体系扩大波及体积及提高洗油效率具有重要的作用。通过分子结构设计合成出了系列不同分子结构的丙烯酰胺类两亲聚合物驱油剂及具有主体β-环糊精聚合物驱油剂。采用动态光散射、原子力显微镜、扫描电镜、流变等方法系统研究了两亲聚合物分子结构、超分子包结作用、环境因素、表面活性剂等对驱油用两亲聚合物溶液中的聚集体的影响规律、调控作用及其对制备乳状液稳定性的影响。通过两亲聚合物在均质岩心和非均质岩心中的室内驱替实验，研究了两亲聚合物驱聚集体微观调控与宏观乳化性能关系。通过上述研究，阐明了聚集体的调控规律和作用机理，确定出了高粘度—低张力两亲聚合物/表面活性剂二元体系，建立了两亲聚合物聚集体调控与乳化关系，揭示了聚集体调控对增强乳化作用机理及乳状液的稳定机理，探明了驱替过程两亲聚合物与油乳化的动态行为规律。为两亲聚合物、两亲聚合物/表面活性剂二元复合驱驱油配方设计提供理论指导，为两亲聚合物驱提高采收率及采出液处理提供了理论基础，为高效驱油剂研制及驱油机理研究提供了科学依据。