高浓度三元复合体系性能评价及机理分析

Performance evaluation and mechanism analysis of ASP system with high concentration

针对油田实际需求,利用仪器测试和理论分析方法,对碱/表面活性剂/聚合物(ASP)三元复合体系黏度、界面张力、静吸附特性、流变性和流动特性进行了系统评价。结果表明,随碱浓度增加,三元复合体系黏度和界面张力降低;随表面活性剂浓度增加,三元复合体系黏度先降后升,界面张力降低。在三元复合体系中,表面活性剂静吸附量最大,碱次之,聚合物最小。随碱浓度增加,三元复合体系黏弹性降低;表面活性剂对三元复合体系黏弹性影响不大。流动性实验表明,溶剂水除垢后三元复合体系阻力系数和残余阻力系数变小。随碱浓度降低、聚合物浓度升高和岩心渗透率降低,三元复合体系阻力系数和残余阻力系数增大;随表面活性剂浓度增加,三元复合体系阻力系数和残余阻力系数呈现"先减小后增大"的变化趋势。

Aiming at actual demand of oilfields ,the viscosity ,interfacial tension ,static ad-sorption property , rheological behavior and flow characteristics of alkali/surfactant/polymer （ASP） system have been evaluated through instrument test and theoretical method .The results showed that with the increase of alkali concentration ,viscosity and interfacial tension of ASP sys-tem decreased .With the increase of surfactant concentration ,viscosity and interfacial tension of ASP system decreased .With the increase of surfactant concentration ,viscosity of ASP system first decreased then increased ,and interfacial tension decreased .In the ASP system ,static ab-sorption of surfactant was the largest ,then alkali followed and polymer came last .With the in-crease of alkali concentration ,viscoelasticity of ASP system decreased .Surfactant had little im-pact on the viscoelasticity of Asp system .As is showed in flow characteristics experiments ,re-sistance coefficient and residual resistance coefficient of ASP system decreased after descaling of solvent water .With the decrease of alkali concentration ,polymer concentration increased and core permeability decreased ,resistance coefficient and residual resistance coefficient of ASP sys-tem increased .With the increase of surfactant concentration ,resistance coefficient and residual resistance coefficient of ASP system first decreased then increased .