三元复合体系对不同润湿性简化孔隙中残余油的作用研究

发布时间：2019-03-18 14:06

【摘要】：碱/表面活性剂/聚合物三元复合驱(ASP)是既可以提高驱油的波及体积又能提高波及效率的三次采油方法,大量室内研究和矿场实验表明三元复合驱的增油效果明显,可在水驱的基础上提高采收率20%,目前三元复合驱已经进入了工业化推广阶段。但是目前三元复合驱的机理已经存在一定程度上的滞后,限制了三元复合驱的进一步发展,亟需开展攻关,深入研究,为驱油剂研制、驱油方案编制及矿场试验动态跟踪调整提供理论支持。本文配置不同碱类型、碱浓度及表面活性剂类型及浓度的三元复合体系,利用TX500C全量程旋转滴界面张力仪测量三元复合体系的界面张力,研究影响三元复合体系界面张力的因素;利用液滴(气泡)扩张法研究碱的浓度、类型及表面活性剂的浓度、类型对体系界面粘度的影响;通过微观驱油实验研究了超低界面张力对简化孔道内残余油的作用、孔道润湿性对残余油启动运移的影响及界面粘度对残余油乳化的影响,结果表明:碱的粘度、类型以及表明活性剂的粘度、类型均影响三元复合体系界面性质;孔道润湿性不同,残余油的启动运移方式不同;三元复合体系采出的残余油量随着界面张力的降低而升高;在三元复合体系的界面张力数量级相同情况下,界面扩张粘弹性越低,乳化作用越强,驱油效果越好。
[Abstract]:Alkali / surfactant / polymer ASP flooding (ASP) is a tertiary oil recovery method which can not only improve the sweep volume but also the sweep efficiency. A large number of laboratory studies and field experiments show that ASP flooding has obvious oil increasing effect. The oil recovery can be increased by 20% on the basis of water flooding. At present, ASP flooding has entered the stage of industrialization and popularization. But at present, the mechanism of ASP flooding has lagged behind to a certain extent, which limits the further development of ASP flooding. The formulation of oil displacement scheme and the dynamic tracking adjustment of field test provide theoretical support. In this paper, the interfacial tension of ternary composite system with different alkali type, alkali concentration and surfactant type and concentration was measured by TX500C full-range rotating droplet interfacial tension meter. The factors affecting interfacial tension of ternary composite system were studied. The effects of the concentration of alkali, the type of surfactant and the type of surfactant on the interfacial viscosity of the system were studied by the droplet (bubble) expansion method. The effect of ultra-low interfacial tension on simplifying residual oil in pore channel, the effect of wettability of pore channel on the initiation and migration of residual oil and the effect of interfacial viscosity on emulsification of residual oil were studied by microcosmic oil displacement experiment. The results show that the viscosity of alkali, the influence of interfacial viscosity on residual oil emulsifying. The interfacial properties of ternary composite system were influenced by the type of surfactant and the viscosity and type of active agent. The starting and migration modes of residual oil are different with different wettability of pore channel, and the residual oil produced by ternary composite system increases with the decrease of interfacial tension. When the interfacial tension of ternary composite system is the same, the lower the viscoelasticity of interfacial expansion is, the stronger the emulsifying effect is, and the better the oil displacement effect is.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.4

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