纵向非均质油藏聚合物变阻力渗流规律实验研究

发布时间：2018-05-17 20:39

本文选题：纵向非均质油藏 + 聚合物驱　；参考：《新疆石油地质》2017年03期

【摘要】：聚合物驱在多个矿场试验中取得了良好的应用效果,但在聚合物驱过程中常常出现吸液剖面返转现象,而传统的交替注入聚合物溶液来控制吸液剖面返转的理论对笼统开发纵向非均质油藏并不适用。从计算油水两相流的阻力出发,研究了聚合物驱过程中发生吸液剖面返转的机理与判别方法,探讨了交替注入聚合物溶液在笼统开发过程中提高采收率的机理,确定了聚合物驱适用的渗透率级差界限。结果表明,在纵向非均质油藏中,各层的流度极值点对应的注入量为聚合物驱吸液剖面返转发生点;在笼统开发纵向非均质油藏的情况下,交替注入聚合物溶液没有明显提高低渗层吸液量,而是通过聚并油墙作用来提高采收率;当纵向非均质油藏储集层渗透率级差大于4时,单一聚合物驱已不能达到最佳的开发效果,需要调整吸水剖面后再进行聚合物驱以提高原油采出程度。
[Abstract]:Polymer flooding has achieved good results in many field tests, but it often occurs in the process of polymer flooding. The traditional theory of alternating injection of polymer solution to control the return of liquid absorption profile is not suitable for the general development of vertical heterogeneous reservoirs. Based on the calculation of the resistance of oil-water two-phase flow, this paper studies the mechanism and discriminant method of backturning of liquid absorption profile during polymer flooding, and discusses the mechanism of increasing oil recovery in the general development process of alternating injection of polymer solution. The limit of permeability difference for polymer flooding is determined. The results show that in the longitudinal heterogeneous reservoir, the injection rate corresponding to the mobility extremum of each layer is the point where the polymer flooding fluid absorption profile turns back, and in the case of general development of the longitudinal heterogeneous reservoir, Alternative injection of polymer solution did not obviously increase the liquid absorption of low permeability reservoir, but increased oil recovery through the action of oil wall, when the reservoir permeability difference of longitudinal heterogeneous reservoir was greater than 4, The single polymer flooding can not achieve the best development effect. It is necessary to adjust the water absorption profile and then carry out polymer flooding to improve the recovery degree of crude oil.
【作者单位】：中国石油大学石油工程教育部重点实验室;中国石油大学石油工程学院;中海油研究总院;中海油海洋石油高效开发国家重点实验室;
【基金】：国家科技重大专项(2016ZX05025-003-010) 中国石油大学优秀博士学位论文基金项目(01JB0585)
【分类号】：TE357.46

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