海上注聚油田聚合物强化泡沫驱实验研究与应用

注聚油田进入注聚中后期,形成的聚窜通道会严重降低聚驱效果,而海上油田受开发投资、平台空间等限制,难以实施多轮次调剖减缓聚窜的影响。为进一步提高海上注聚油田化学驱增油效果,以渤海J油田为研究对象,进行了聚合物强化泡沫驱模拟实验,结果表明,聚合物强化泡沫驱油体系能够有效封堵高渗层窜流通道,提高低渗透层的动用程度;增加复合体系注入段塞对高渗层起到更强的封堵作用,改善整体驱油效果;相比于中高含水期,高含水时机下转为聚合物强化泡沫驱,提高采收率幅度更大。

Experimental study and application of polymer enhanced foam flooding in offshore polymer injecting oilfield

When the polymer injecting oilfield enters the middle and late stage of polymer injection, the formation of polymer channeling channel will seriously reduce the polymer flooding effect, while affected by development investment, platform space and other restrictions, it is difficult for the offshore oilfield to implement multi-round profile control to mitigate the impact of polymer injection. In order to further improve the effect of oil increase by chemical flooding in offshore polymer injecting oilfields, the physical simulation experiment of J oilfield in Bohai sea shows that the polymer enhanced foam flooding system can effectively block the flow channel of hyperpermeability layer and improve the utilization degree of low-permeability layer.The injection slug of the composite system has a stronger sealing effect on the hyperpermeability layer and improves the overall oil displacement effect. Compared with the middle and high water cut stage, the higher water cut stage can be converted into polymer enhanced foam flooding, and the enhanced oil recovery can be achieved.