基于点坝构型直平联合水驱—化学驱物理模拟实验

发布时间：2018-05-07 19:54

本文选题：点坝 + 单砂体构型　；参考：《东北石油大学》2017年硕士论文

【摘要】：我国大部分储层已经进入高含水阶段,采收率较低,化学驱是其油田后期重要的开采方式,但其开采由于受到储层内部夹层的影响,仍有大量的剩余油存在于储层中。因而如何进一步提高油田的采收率,是开采的关键,点坝储层而进一步提高采收率的措施又依赖于对直井与水平井的正确组合,同时对点坝储层内部剩余油形成与分布的科学认识也很重要。本次实验基于研究区点坝内部构型,建立直井与水平井联合的三维点坝物理实验模型,通过物理实验探索水平井对储层内剩余油的动用情况,正确认识注入剂空间波及特征以及模型内部剩余油分布机理,为进一步挖潜点坝储层内部剩余油提供科学依据。本次研究以大庆油田北一区断东研究区为例,在重点沉积时间单元对比与沉积微相研究的基础上,提取点坝内部夹层的倾角、倾向等构型参数,利用petrel软件建立点坝构型模型。在构型模型研究的基础上进行点坝三维物理模拟实验,重点针对PI2b油层中的点坝内部构型及沉积特征,设计直井与水平井联合的两组构型相同三维物理实验模型,进行水驱—化学驱的物理模拟实验。在三元复合驱阶段设计三种不同的井网方案,当含水率高于标准后,模型进行井网转变。并通过实验数据对比不同井网的采出程度,分析井网转变前后实验现象。在水驱阶段模型的采出程度为约为40%,实验结束后模型的采出程度可达约为60%,其采出程度可提高约为20%。在实验结束后,通过对模型进行切割取样,研究模型不同层位的水淹规律。经研究发现点坝模型底部高水淹,是注入剂的优势渗流通道。模型中的剩余油可以被很好动用采出程度可达68%,而模型上部由于上覆泥岩且上倾尖灭富集大量剩余油。受水平井注入端驱替作用、泥质夹层与废弃河道的遮挡作用以及不同井网的驱替效果,使模型垂向与平面的剩余油分布存在差异性。同时水平井注,直井采的井网布置方案对于研究区的驱替效果较好。
[Abstract]:Most of the reservoirs in China have entered the stage of high water cut and the recovery is low. Chemical flooding is an important way of exploitation in the later stage of the oil field. However, due to the influence of intercalation within the reservoir, a large number of remaining oil still exist in the reservoir. Therefore, how to further improve oil recovery is the key to exploitation. The measures to further improve oil recovery in point dam reservoir depend on the correct combination of vertical well and horizontal well. At the same time, it is important to understand the formation and distribution of residual oil in point dam reservoir. Based on the internal configuration of point dam in the study area, a three-dimensional physical model of point dam combined with vertical well and horizontal well is established in this experiment, and the production of remaining oil in reservoir by horizontal well is explored through physical experiments. A correct understanding of the space sweep characteristics of injectors and the distribution mechanism of residual oil in the model provides a scientific basis for further tapping potential point dam reservoir residual oil. In this study, based on the correlation of key sedimentary time units and the study of sedimentary microfacies, the dip angle and inclination of intercalation in point dam are extracted, and the point dam configuration model is established by using petrel software, taking the study area of fault east of North first area of Daqing Oilfield as an example, based on the comparison of key sedimentary time units and the study of sedimentary microfacies. Based on the research of the configuration model, the three-dimensional physical simulation experiment of the point dam is carried out. According to the internal configuration and sedimentary characteristics of the point dam in the PI2b reservoir, two sets of three-dimensional physical experimental models with the same configuration of the vertical well and the horizontal well are designed. The physical simulation experiment of water flooding and chemical flooding was carried out. Three different well pattern schemes are designed in the ASP flooding stage. When the water cut is higher than the standard, the model changes well pattern. The experimental phenomena before and after well pattern transformation are analyzed by comparing the recovery degree of different well patterns with experimental data. At the stage of water drive, the recovery degree of the model is about 40. After the experiment, the recovery degree of the model can reach about 60, and the recovery degree of the model can be increased to about 20. At the end of the experiment, the model was cut and sampled to study the water flooding law of different layers of the model. It is found that high flooding at the bottom of the point dam model is the dominant seepage channel for injection agent. The residual oil in the model can be produced well and the recovery degree can reach 68%, while the upper part of the model is rich in a large amount of remaining oil due to the overburden mudstone and the updip tip-out. Due to the displacement at the injection end of horizontal well, the blocking effect of muddy intercalation and abandoned channel, and the displacement effect of different well pattern, the distribution of residual oil in vertical and plane direction of the model is different. At the same time, the pattern layout of horizontal well injection and straight well production is better for displacement in the study area.
【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】：TE319

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