应用改进的POLYMER软件研究聚合物驱后剩余油分布

在建立大庆油田北一二排西块精细地质模型基础上,应用改进的Polymer软件对区块水驱-聚合物驱全过程进行了历史拟合,预测出了聚合物驱后剩余油饱和度分布,并绘制了不同沉积单元水驱后和聚合物驱后剩余油饱和度等值图。根据相渗曲线回归得到的残余油饱和度和渗透率的关系,计算了各网格块的残余油饱和度,以此为基础,统计出了不同沉积单元、不同沉积微相、不同厚度级别和渗透率级别的剩余储量和剩余可采储量等指标。结果表明,具有一定厚度的中低渗透油层剩余可采储量相对较高,应作为下步重点挖潜对象。

Study on remaining oil distribution after polymer flooding by utilizing improved polymer software

Based on fine geological model in BeiYiErPaiXi block and history matching of the whole process of water flooding and polymer flooding, the remaining oil distributions after water flooding and polymer flooding were given using improved POLYMER software. The remaining oil contours for different sedimentary units were also plotted. Residual oil saturation for all grids was calculated on the basis of relations between residual oil saturation and permeability. Then remaining oil reserve and remaining recoverable reserve of Beiyierpaixi block were calculated with different sedimentary unit, different sedimentary microfacies, different permeability, and thickness layers. Results show that moderate or low permeability formations have relatively large recoverable reserve, which should be considered as the potential targets.