聚合物驱油后提高采收率优化研究

EOR optimization after polymer flooding

喇萨杏油田聚合物驱油后进入后续水驱阶段的油藏逐年增多,在分析聚合物驱油区块现状和进一步提高采收率潜力的基础上,明确剩余油分布特征及进一步提高采收率挖潜思路。以北一区断东中块典型区块为例,研究了层系、井网重构和顶部水平井挖潜的可行性,提出聚合物驱油后现场试验方案,预计方案实施后可提高采收率5个百分点。

After polymer flooding in the Lasaxing oilfield,more and more reservoirs have entered subsequent water flooding stage.This paper analyzes the current status of polymer flooding blocks and the potential of improving recovery factor,and determines the distribution of remaining oil and the way of improving recovery factor after polymer flooding.Taking a typical block in the middle block of the North 1 area as an example,this paper researches the feasibilities of layer series and well pattern rearrangement and placing horizontal well in top reservoir,proposes a plan of field test after polymer flooding,and it is anticipated that there will be a 5% increase in recovery factor after implementation of the plan.