聚合物驱剖面返转数值模拟方法研究

Research on Numerical Simulation Method of Section Inversion during Polymer Flooding

非均质油藏聚合物单一段塞驱油过程中吸液剖面易发生返转，不利于提高采收率。针对室内物理模拟试验花费高、周期长、工作量大，常规数值模型难以描述聚合物驱剖面返转现象的问题，根据渗流理论、聚合物驱物化现象，建立了聚合物驱两层并联不窜流线性渗流模型；结合油藏数值模拟软件特点，提出了根据储层物性分区进行聚合物特征参数差异赋值的剖面返转数值模拟方法。采用建立的剖面返转数值模拟方法对油田聚合物驱剖面返转现象的影响因素进行了系统研究，结果表明，渗透率级差、注聚时机、聚合物质量浓度对聚合物剖面返转现象影响较大，为研究聚合物驱吸液剖面返转规律及减缓剖面返转现象提供技术支持。

The inversion of injection profile was easily induced in single slug injection in heterogeneous reservoirs; it was unfavorable for enhancing oil recovery. In allusion to the problems of high cost, long duration and heavy workload of laboratory simulation, which were hard to be described by conventional reservoir simulation, based on percolation theory and physical-chemical property in polymer flooding, an uncross flow linear percolation model of two parallel layers was established. Compared with the characteristics of simulation software, a simulation method for profile inversion was proposed based on the sorting of reservoir physical property. The studied method is used for systematically studying the factors influencing the profile inversion; the result shows that the permeability contrast, its injection time and its concentration are the major factors affecting the inversion; it provides a technical support for studying the regulation and the reduction of profile inversion in polymer flooding.