聚合物驱微观剩余油运移规律及驱油效果研究

聚合物驱是进一步提高水驱油藏采收率的主要技术手段之一。目前的聚合物驱油机理研究仅能反映聚合物对不同类型剩余油的驱替过程，没有考虑孔隙结构的微观非均质性对驱油效果的影响。以光刻微观物理模型为研究手段，深入研究了聚合物驱不同类型剩余油运移规律及不同分子量聚合物在不同渗透率微观模型的驱油效果。研究结果表明，不同分子量的聚合物启动不同类型剩余油的顺序和难易程度不同，各类型剩余油动用比例不同，聚合物驱较易启动簇状、油滴、柱状剩余油，盲端、膜状剩余油主要依靠聚合物的黏弹性剥离，相比之下启动难度大于前几类剩余油。

Study on migration law of micro remaining oil and displacement effect of polymer flooding

Polymer flooding is one of the main technical means to further improve the oil recovery of water drive reservoirs.The current study on polymer flooding mechanism can only reflect the displacement process of polymer for different types of remaining oil，without considering the influence of micro heterogeneity of pore structure on oil displacement effect.By means of microscopic physical model of photolithography，the migration rules of different types of remaining oil in polymer flooding and the displacement effects of different molecular weight polymers in different permeability microscopic models were studied in depth.The research results showed that the sequence and degree of difficulty of starting different types of remaining oil by polymers with different molecular weights were different，and the proportion of producing different types of remaining oil was different.Polymer flooding was easier to start cluster，oil drop and column remaining oil，and the blind end and film remaining oil mainly depend on the viscoelastic stripping of polymers，which was more difficult to start than the previous types of remaining oil.