三元复合驱集输系统沉积、悬浮物跟踪分析

发布时间：2018-09-16 21:59

【摘要】：三元复合驱提高采收率技术是油田开发后期的重要技术措施,大庆油田自2009年以来,三次采油区块不再安排聚合物驱,而全面开展三元复合驱,随着三元复合驱的推广使用,在油层近井地带以及采出液中均出现了结垢现象,垢的存在不仅造成生产隐患、降低生产效率、增大生产成本,同时还制约了三元复合驱技术的广泛应用。本论文以大庆油田采油四厂实际情况为例,研究在油田开采过程中,三元复合驱强碱驱油体系采出液与地层岩石的相互作用,分析了三元复合驱强碱驱油体系采出液的结垢成因,并得出三元复合驱强碱驱油体系采出液的结垢机理。从复合驱驱油机理研究出发,考察了复合驱驱油体系的流变学性质和它们之间的协同效应,并从理论上探讨了影响复合驱驱油效率的几个重要因素;在此基础上,以大庆油层条件为例,通过室内实验考察了五种复合体系与大庆原油间的界面张力性质,筛选出三种不同界面张力数量级的驱油体系,并进一步通过岩芯驱油实验探询三元复合驱中驱油效率与油层渗透率、体系界面张力之间的相互关系;研究表明:界面张力是复合驱大幅度提高采收率的主要因素;复合体系与原油间的界面张力值,包括平衡和瞬时动态界面张力值对于复合驱的驱油效果有显著的影响;油水界面张力降低到10-3mN/m数量级是三元复合驱大幅度提高采收率的充分条件,而不是必要条件;油层岩石润湿性对岩芯的饱和程度以及复合驱采收率都有明显影响,随着润湿接触角的增大,复合驱采收率明显增加;在化学剂组成和浓度相同的情况下,中等渗透率的岩芯的驱油效率更高。
[Abstract]:ASP flooding is an important technical measure in the later stage of oilfield development. Since 2009, the tertiary oil recovery block in Daqing Oilfield has not arranged polymer flooding, but has carried out ASP flooding in an all-round way. With the popularization and use of ASP flooding, Scaling phenomenon occurs in the oil reservoir near well and in the produced liquid. The existence of scale not only causes hidden trouble in production, reduces production efficiency and increases production cost, but also restricts the wide application of ASP flooding technology. Taking the actual situation of No. 4 Oil recovery Plant in Daqing Oilfield as an example, this paper studies the interaction between the produced fluid and the strata and rocks in the ASP flooding strong alkali flooding system in the process of oilfield production. The cause of scale formation of produced liquid of ASP flooding strong alkali flooding system is analyzed, and the scaling mechanism of produced liquid of ASP flooding strong alkali flooding system is obtained. Based on the study of the mechanism of compound flooding, the rheological properties and synergistic effects between them are investigated, and several important factors affecting the efficiency of compound flooding are discussed theoretically. Taking Daqing reservoir as an example, the interfacial tension properties between five composite systems and Daqing crude oil were investigated through laboratory experiments, and three oil displacement systems with different interfacial tension were selected. The relationship between oil displacement efficiency, reservoir permeability and interfacial tension in ASP flooding is further investigated through core flooding experiments. The results show that interfacial tension is the main factor to improve oil recovery in ASP flooding. The interfacial tension between composite system and crude oil, including equilibrium and instantaneous dynamic interfacial tension, has a significant effect on the displacement effect of composite flooding. Lowering the interfacial tension of oil and water to the order of 10-3mN/m is the sufficient condition for ASP flooding to increase oil recovery greatly, and the wettability of reservoir rock has obvious influence on the saturation degree of core and recovery factor of composite flooding. With the increase of wetting contact angle, the recovery factor of composite flooding increases obviously, and the oil displacement efficiency of the core with medium permeability is higher when the composition and concentration of the chemical agent are the same.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

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