ASP驱模拟采出液动力学稳定性机理研究

Study on the mechanism of dynamic stability of simulated produced fluid in ASP flooding

根据油田现场提供采出液中驱油剂质量浓度变化范围,室内配制ASP驱模拟采出液,从宏观角度监测了ASP驱采出液中驱油剂类型和质量浓度变化对体系脱水率、背散射光和稳定性表征值(TSI值)的影响,同时测定了采出液的流变性和界面膜强度,从微观角度分析了模拟采出液的动力学稳定机理。结果表明,脱水率和TSI值对ASP采出液稳定性的影响规律一致。使用TURBISCAN稳定性分析仪对采出液体系进行扫描测定,得到了乳状液失稳过程的动态实时变化;随着碱质量浓度的增大,界面黏弹性先增大后减小,碱对体系黏性影响较小,界面膜强度先增强后变弱,采出液稳定性先变好后变差,当碱质量浓度为900 mg/L时采出液最稳定;随着表面活性剂质量浓度的增大界面膜弹性增大,黏性变化不大,界面膜强度增加,采出液稳定性增加;随着聚合物质量浓度的增大,油/水界面黏弹性增大、界面膜强度增加,采出液稳定性增加。

According to the variation range of the mass concentration of the oil displacement agent in the produced fluid provided in the oil field,an ASP flooding simulated produced fluid was prepared in room.The influences of the type and concentration of the oil displacement agent in ASP flooding produced fluid on the system dehydration rate,backscattered light and stability characterization value(TSI value)were monitored from a macro perspective.At the same time,the rheology and interfacial film strength of the produced fluid were measured,and the mechanism of dynamic stability of the simulated produced fluid was analyzed from a micro perspective.The results showed that the influences of dehydration rate and TSI value on the stability of ASP produced fluid were consistent.The scanning measurement of the produced fluid system by TURBISCAN stability analyzer could obtain the dynamic and real-time changes in the process of emulsion instability.With the increase of alkali mass concentration,the interface viscoelasticity first increased and then decreased,and the influence of alkali on the viscosity of the system was small.The interface film strength first increased and then weakened,and the stability of produced fluid first improved and then decreased.When the alkali mass concentration was 900 mg/L,the produced fluid was most stable.With the increase of surfactant mass concentration,the elasticity of the interfacial film increased,the viscosity changed little,the strength of the interfacial film increased,and the stability of the produced fluid increased.With the increase of polymer mass concentration,the viscoelasticity of the oil-water interface increased,the interfacial film strength increased,and the stability of the produced fluid increased.