【作者】 陈金凤；

【导师】 李宜强；

【作者基本信息】 大庆石油学院 ， 油气田开发， 2009， 硕士

【摘要】 室内实验结果表明,聚驱后地层中仍残留大量剩余油,如何充分挖潜残留在地下的原油是当前亟需解决的问题。聚驱后利用三元复合驱虽然能够大幅度地提高原油采收率,但是碱的使用不仅降低了聚合物的粘度,同时还会引起地层粘土分散、运移、地层渗透率下降、油层及井底结垢、生产井产液能力降低、监泵周期缩短、采出液破乳脱水困难等一系列问题。针对三元复合驱的上述问题,本文模拟萨南开发区储层特点研制了室内人造物理模型,探索聚驱后利用无碱聚合物/表面活性剂二元复合体系进一步提高采收率幅度的可行性。本文综合现场和室内经验初步确定二元复合体系的配方,通过性能评价实验对二元体系配方进行优化。利用优化后的二元体系开展水驱、一次聚驱和二元复合驱实验研究。通过静态、动态驱油实验对非离子表面活性剂和新型表面活性剂二元复合体系的粘度、界面张力的稳定性以及驱油效果进行评价,同时通过均质和非均质岩心实验对比二元体系与三元体系的驱油效果,另外开展室内物理模拟实验对二元体系在大平面模型流线上的分布及吸附滞留规律进行系统的研究。实验结果表明:该二元体系与所选现场区块原油的界面张力在较宽的活性剂浓度范围内均能够达到10-3mN/m数量级;体系的粘度和界面张力的稳定性较好;室内物理模拟实验结果表明,聚驱后在人造均质和非均质岩心中注入该二元体系均可以提高采收率10%左右,且在非均质岩心中二元体系驱油效果要好于三元体系。更多还原

【Abstract】 Laboratory experimental results show that after polymer flooding,there is still a large number of the remaining residual oil in the formation, how to make the best potential residue of crude oil is an urgent need to resolve. Although ASP flooding used after polymer flooding can be significantly enhanced oil recovery, the use of alkali, not only reduces the viscosity of the polymer solution, also causes series of problems such as clay dispersion and migration of formation, permeability decreasing,oil and bottom scale, decreasing of liquid-producing capacity and pump inspection period, difficult of produced liquid demulsification and dehydration.For the above-mentioned issues caused by ASP flooding,feasibility of SP flooding after polymer flooding to enhancing oil recovery is studied at the base of some laboratory modelling experiments on oil displacement in artificial cores in this paper.In this paper, the initial formula of binary composite system which is identified at the base of laboratory and field tests.,is optimized through performance evaluation experiments. Some laboratory modelling experiments on oil displacement based on optimized SP binary composite system and evaluations on viscosity,the stability of interfacial tension and oil recovery of SP binary composite system are conducted. are conducted,and at the same time the oil recovery comparison of SP flooding and ASP flooding through oil displacement experiments on homogeneous cores and heterogeneous core. Besides,streamline distribution of SP flooding and.SP distributing law are studied through oil displacement experiments carried out on physical plane model.The following are studied:the interfacial tension between oil and SP solution can reach 10-3 mN/m in a high surfactant concentration range;viscosity and interfacial tension of SP the stability of binary composite system is stable;After polymer flooding with the SP slug drive going on again thereafter,the average enhanced recovery is about 10%,seen from the oil recovery regardless of homogeneous core or heterogeneous core,and oil recovery is higher than that of ASP flooding更多还原