不同表面活性剂的弱碱三元驱驱油效果实验研究
发布时间：2018-07-25 10:05
【摘要】：目前,三元复合驱逐渐成为大庆油田的主导开采技术。三元复合驱包括强碱三元复合驱和弱碱三元复合驱。鉴于强碱三元驱造成的结垢现象严重阻碍了正常生产,弱碱三元复合驱的研究越来越受到人们的重视。因此,研究弱碱三元体系性能及对采收率的影响,对油田进一步开采具有重要的指导意义。本文选择了三种表面活性剂,分别是石油磺酸盐、可控变量烷基苯和脂肽,其中选择石油磺酸盐和脂肽搭配使用形成复配体系,我们借助仪器从研究三元复合体系的性能为起点,研究了三元复合体系的流变性、粘弹性、界面张力及其影响因素,并通过测定阻力系数和残余阻力系数分析了不同的表面活性剂造成了弱碱三元体系的流动性差异;通过玻璃刻蚀可视化驱油实验研究了弱碱三元体系对残余油的启动运移机理;在均质岩心岩心中分别进行驱油实验来研究表活剂类型、组分浓度及主段塞大小对采收率的影响。实验结果表明:三元复合体系粘度与碱浓度成反比关系,同时碱的加入会降低其粘弹性;表面活性剂使三元复合体系粘度先下降然后上升,以表面活性剂的临界胶束浓度为分界点;温度和存放时间对三元复合体系粘度存在不利影响,温度越高粘性越差;存放时间越长,三元体系粘度损失越大,脂肽复配体系粘度稳定性最差。三种表活剂的三元复合体系油水界面张力都能达到超低界面张力级别,在界面张力活性图中,脂肽复配体系保持超低界面张力浓度范围最广。加入表面活性剂以后三元复合体系的阻力系数和残余阻力系数都会发生不同程度的上升;通过微观可视化模型发现,乳化油滴作用是三元复合体系采出残余油过程中最重要的方式;在室内岩心驱油试验中发现,脂肽复配体系驱油效果最好;提高石油磺酸盐和弱碱浓度、增加主段塞注入量,能够有效提高采收率。
[Abstract]:At present, ASP flooding has gradually become the dominant production technology in Daqing Oilfield. ASP flooding includes strong alkali ASP flooding and weak base ASP flooding. In view of the scaling phenomenon caused by strong alkali ternary flooding seriously hinders normal production, the study of weak alkali ternary flooding has been paid more and more attention. Therefore, it is important to study the properties of weak alkali ternary system and its influence on oil recovery. In this paper, three kinds of surfactants, petroleum sulfonate, controllable variable alkylbenzene and lipopeptide, were selected, among which petroleum sulfonate and lipopeptide were used together to form a compound system. We have studied the rheology, viscoelasticity, interfacial tension and its influencing factors of ternary composite system from the point of view of studying the properties of ternary composite system by means of instruments. By measuring resistance coefficient and residual resistance coefficient, the fluidity difference of weak base ternary system caused by different surfactants was analyzed, and the starting migration mechanism of weak base ternary system to residual oil was studied by glass etching visual flooding experiment. Oil displacement experiments were carried out in homogeneous cores to study the effects of the types of apparent active agents, the concentration of components and the size of the main slug on the oil recovery. The experimental results show that the viscosity of the ternary composite system is inversely proportional to the concentration of alkali, and the viscosity of the ternary composite system is reduced by the addition of alkali, while the viscosity of the ternary composite system decreases first and then increases with the addition of the base. With the critical micelle concentration of surfactant as the boundary point, the viscosity of the ternary system is adversely affected by temperature and storage time, the higher the temperature is, the worse the viscosity is, and the longer the storage time is, the greater the viscosity loss of the ternary system is. The viscosity stability of lipopeptide compound system was the worst. The oil-water interfacial tension of the three kinds of surfactants can reach the ultra-low interfacial tension level. In the interfacial tension activity diagram, the lipopeptide compound system maintains the widest range of ultra-low interfacial tension concentration. The resistance coefficient and residual resistance coefficient of the ternary composite system increase in varying degrees after the addition of surfactant, and it is found by the microscopic visualization model that the resistance coefficient and residual resistance coefficient of the ternary composite system will increase in varying degrees. The emulsified oil droplet is the most important way in the recovery of residual oil in the ternary composite system, and it is found in the laboratory core flooding test that the lipopeptide compound system has the best oil displacement effect, the concentration of petroleum sulfonate and weak base is increased, and the injection amount of the main slug is increased. It can effectively improve the recovery efficiency.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46
，
本文编号：2143463
[Abstract]:At present, ASP flooding has gradually become the dominant production technology in Daqing Oilfield. ASP flooding includes strong alkali ASP flooding and weak base ASP flooding. In view of the scaling phenomenon caused by strong alkali ternary flooding seriously hinders normal production, the study of weak alkali ternary flooding has been paid more and more attention. Therefore, it is important to study the properties of weak alkali ternary system and its influence on oil recovery. In this paper, three kinds of surfactants, petroleum sulfonate, controllable variable alkylbenzene and lipopeptide, were selected, among which petroleum sulfonate and lipopeptide were used together to form a compound system. We have studied the rheology, viscoelasticity, interfacial tension and its influencing factors of ternary composite system from the point of view of studying the properties of ternary composite system by means of instruments. By measuring resistance coefficient and residual resistance coefficient, the fluidity difference of weak base ternary system caused by different surfactants was analyzed, and the starting migration mechanism of weak base ternary system to residual oil was studied by glass etching visual flooding experiment. Oil displacement experiments were carried out in homogeneous cores to study the effects of the types of apparent active agents, the concentration of components and the size of the main slug on the oil recovery. The experimental results show that the viscosity of the ternary composite system is inversely proportional to the concentration of alkali, and the viscosity of the ternary composite system is reduced by the addition of alkali, while the viscosity of the ternary composite system decreases first and then increases with the addition of the base. With the critical micelle concentration of surfactant as the boundary point, the viscosity of the ternary system is adversely affected by temperature and storage time, the higher the temperature is, the worse the viscosity is, and the longer the storage time is, the greater the viscosity loss of the ternary system is. The viscosity stability of lipopeptide compound system was the worst. The oil-water interfacial tension of the three kinds of surfactants can reach the ultra-low interfacial tension level. In the interfacial tension activity diagram, the lipopeptide compound system maintains the widest range of ultra-low interfacial tension concentration. The resistance coefficient and residual resistance coefficient of the ternary composite system increase in varying degrees after the addition of surfactant, and it is found by the microscopic visualization model that the resistance coefficient and residual resistance coefficient of the ternary composite system will increase in varying degrees. The emulsified oil droplet is the most important way in the recovery of residual oil in the ternary composite system, and it is found in the laboratory core flooding test that the lipopeptide compound system has the best oil displacement effect, the concentration of petroleum sulfonate and weak base is increased, and the injection amount of the main slug is increased. It can effectively improve the recovery efficiency.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46
，
本文编号：2143463
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