乳化对注入压力贡献程度的表征及影响因素研究

摘要

系统研究碱/表面活性剂/聚合物三元复合体系乳化对压力的贡献程度.首先建立了乳化压差的表征方法,在此基础上,考察了驱替体系类型、界面张力量级和岩心渗透率的大小对乳化压差的影响,并通过微观驱油实验,分析了不同类型驱替体系乳化压差存在差异的作用机理.结果表明,与聚合物体系相比,碱/表面活性剂/聚合物三元复合驱体系乳化可产生较强的渗流阻力,具有较高的乳化压差;超低界面张力时,易产生较高乳化压差;岩心渗透率对乳化压差影响较大,在低渗条件下易产生较高乳化压差.%In order to evaluate contribution of emulsification to pressure,the evaluation method of emulsification pressure difference is developed.And then the effect of various factors on emulsification pressure difference is systematically investigated,including the type of flooding systems,the order of interfacial tension and core permeability.The results show that seepage resistance of alkali/surfactant /polymer system is stronger than that of polymer system.The reduction of interfacial tension may improve emulsification pressure difference on certain degree.The core permeability has a great influence on pressure difference and higher emulsification pressure difference is easily obtained for core with lower permeability.