摘      要：聚/表二元复合驱技术在油田中的应用逐渐普及，如何进一步提高二元复合驱后采收程度成为亟待探究的内容。通过室内实验表明二元复合驱后剩余油依然达到40%以上，剩余油主要附存在驱替剂未波及的岩体内。通过继续注入驱替剂扩大波及体积以及封堵过水通道达到开采剩余油的目的，同时也探究了油井停止生产后油水重新分布对后采收程度的影响。实验结果表明采收程度在二元复合驱的基础上注入不同驱替剂能进一步提高1.4%～5.6%，二元复合驱后采收程度主要受到聚合物的浓度、聚合物注入量影响，二元复合驱后是否静置一段时间对采收程度影响较小。

关  键  词：二元复合驱;油水重新分布;表面活性剂;剩余油

中图分类号：TE327       文献标识码： A       文章编号：1671-0460（2020）07-1388-04

Experimental Study on Enhanced Oil Recovery by

Polymer and Surfactant Binary Composite Flooding

ZHOU Jiu-mu

（School of Petroleum Engineering， Northeast Petroleum University， Daqing Heilongjiang 163318， China）

Abstract： The application of binary combination flooding technology in oilfield is gradually popularized. How to further improve the recovery degree after binary combination flooding has become an urgent topic to be explored. The indoor experiments showed that residual oil after binary combination flooding was still above 40%， remaining oil mainly existed in the rock mass where was not swept by the displacement agent. In this experiment， the remaining oil was recovered by continuing to enlarge sweep volume and inject displacement agent to plug water channel， the effect of new oil-water distribution after the well shutdown on the recovery of reproduction was explored. The experimental results showed that the recovery degree was further improved by 1.4%～5.6% by injecting different displacement agents on the basis of binary composite flooding. The recovery degree after binary combination flooding was mainly affected by the polymer concentration and polymer injection amount， and the well shutdown time after the binary combination flooding had little influence on the recovery degree.

Key words： Binary combination flooding; Redistribution of oil and water; Surfactant; Remaining oil

三元復合驱能大幅度提高东部老油田的采收程度，但是也带来了诸多问题：伤害储层、井筒结垢、油水乳化严重等。为了克服这些问题聚/表二元复合驱被人们广泛应用。陈阳^[1]认为聚/表二元驱是进一步提高采收率的方法，并能有效提高驱油效果。唐佳斌^[2]等研究发现聚合物/表面活性剂二元体系应用在大庆油田上获得了较好的驱油效果。它与三元复合驱^[3-4]相比，具有减小对地层伤害等优势。但是单一的二元驱后，剩余油量依旧很高^[5，6]且对于大部分老油田一旦聚/表二元复合驱结束，剩余油如何继续开采，到目前为止还没有成熟的技术。卿华等人研究了强碱三元复合驱后提高采收率的影响因素，通过实验发现注入高浓度聚合物对三元复合驱后提高采收率有很好的效果。……