二类油层三元复合驱后微观剩余油变化规律

发布时间：2018-03-25 02:10

本文选题：三元复合驱　切入点：剩余油　出处：《东北石油大学》2015年硕士论文

【摘要】：大庆油田自1960年投产至今,大部分区块已进入采出液高含水阶段。北一区断东历经基础井网注水阶段、井网加密增产阶段以及聚合物等化学驱阶段后,再次面临高含水问题。而三元复合驱技术能够在稳油控水方面起到一定积极作用,故此区块采用三元复合驱技术以提高采收率。针对二类储层物性特点,研究不同驱替方案的情况下,三元复合驱后孔隙内微观剩余油赋存状态、剩余油含量分布状态以及剩余油组分分布状态。不仅能够实现三元复合驱后储层孔隙中微观剩余油赋存状态规律的可视化,同时也能够为后续开采提供具有针对性意义的理论和数据基础。针对大庆油田二类油层三元复合驱后剩余油的变化规律,本文主要选取300×10-3μm2、500×10-3μm2以及渗透率在二类油层范围内的三层非均质岩心作为研究对象。通过室内实验研究:三元驱替后,剩余油饱和度、剩余油组分以及剩余油类型受到渗透率、毛管数、以及渗透率级差的影响。在不同渗透率的情况下,渗透率的大小对残余油饱和度、轻重组分指数以及各类型剩余油含量变化均起到一定作用,同时通过检测发现角隅状剩余油含量随渗透率变化波动幅度较大。本文主要研究毛管数在10-3~10-1的情况下对驱替效果的影响,同时剩余油饱和度、剩余油组分指数随着毛管数的增大而减小。各级别毛管数驱替后岩心中角隅状剩余油在剩余油类型中所占比例最大,其次是簇状、喉道状剩余油,孔表薄膜状剩余油含量最小。不难发现毛管数越大,各类型剩余油含量随之减少。驱油效果与渗透率级差、平均渗透率以及渗透率韵律组合均有很大关系,渗透率级差越大,低渗层未动用剩余油含量越大,平均渗透率越大,各层内剩余油均随之减少,沿程长度对剩余油饱和度以及轻重组分指数均有一定影响。通过检测数据可知,由于渗透率级差、渗透率韵律组合不同,各层的4种类型剩余油含量也有很大差异。但角隅状剩余油仍然所占比例最大,其次为簇状剩余油、喉道状剩余油,孔表薄膜状剩余油含量最少。
[Abstract]:Daqing oilfield has been put into operation since 1960, has entered the most blocks of produced liquid in high water cut stage. North East a zone broken through the basic well pattern infilling water flooding stage, production stage and polymer chemical flooding stage, once again faced with high water content. And the three element composite technology can control the water in oil stabilization plays a certain positive role, therefore block by EOR technology. According to the three element composite layer physical properties of two kinds of reservoir, study the different displacement case, the micro residual oil occurrence state of three element composite pore, residual oil content distribution and residual oil distribution. Not only visual components to achieve three yuan compound drive after the reservoir microscopic residual oil occurrence regularity, but also can provide specific meaning of theory and data mining. The foundation for the subsequent two three reservoir in Daqing Oilfield Changes of residual oil after flooding, this paper selects three layers of heterogeneous cores in two reservoirs in the range of 300 * 10-3 m2500 * 10-3 m2 and permeability as the research object. Through the indoor experiment study: three yuan after the flooding, remaining oil saturation, residual oil component and residual oil by type permeability, capillary number, and the influence of permeability. The permeability in different circumstances, the size of the residual oil saturation, permeability, light and heavy fraction index and residual oil of various types of content change played a role, at the same time, through the detection of corner remaining oil content with the change of permeability large fluctuation. This paper mainly studies the capillary number in the case of 10-3~10-1 influence on the displacement effect, while the remaining oil saturation, residual oil component index decreases with increasing the capillary number. The level of capillary number water flooding core angle The remaining oil in the corner shape types of remaining oil in the largest proportion, followed by cluster, throat like residual oil, residual oil film like Kong Biao. It is not difficult to find the minimum content of capillary number increases, various types of residual oil content reduced. The oil displacement effect and permeability, the average permeability and great rhythm relationship of permeability is, the layer of unused residual oil content is low permeability, the average permeability increases, each layer of residual oil are reduced, along the length of the remaining oil saturation and heavy components have a certain impact index. Through the test data shows that, due to difference of permeability, permeability rhythm, residual the oil content of 4 types of each layer are also very different. But the remaining oil like corner still accounted for the largest proportion, followed by the remaining oil in clusters, throat like residual oil, pore film residual oil content was the least.

【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

【共引文献】