海上油田聚合物驱影响因素分析及参数优化设计

Analysis of influencing factors and parameter optimization design of polymer flooding in offshore oilfields

本文以某海上油田为研究对象,建立了典型的不同沉积韵律的非均质性厚油层油藏地质概念模型。运用数值模拟的方法,分析了油层的韵律性对聚合物驱油效果的影响。实验结果表明,正韵律地层的水驱采收率最低,聚合物驱油对其采收率提高效果最好。再以正韵律油藏为例,分析了地层的非均质性、聚合物的不可及孔隙体积和残余阻力系数对聚合物驱油藏开发效果的影响。最后利用正交设计和模糊评判的方法对聚合物的注入时机、浓度、段塞体积和注入速度等参数进行了优化,确定了最佳的聚合物驱油藏开发方案。

Taking an offshore oilfield as the research object,this paper establishes a typical geological conceptual model of heterogeneous thick oil reservoir with different sedimentary rhythms.Using the method of numerical simulation,the influence of reservoir rhythm on polymer flooding effect is analyzed.The experimental results show that the water flooding recovery of positive rhythm formation is the lowest,and the polymer flooding has the best effect on its recovery.Taking positive rhythm reservoir as an example,the effects of formation heterogeneity,inaccessible pore volume of polymer and residual resistance coefficient on the development effect of polymer flooding reservoir are analyzed.Finally,the parameters of polymer injection timing,concentration,slug volume and injection rate are optimized by using the methods of orthogonal design and fuzzy evaluation,and the best development scheme of polymer flooding reservoir is determined.