聚合物驱提高采收率实验研究

Experiment Study on Enhance Recovery Efficiency in Polymer Flooding

关键词:  聚合物驱  窜流  非均质  浓度  采收率

Key words:  polymer flood  cross flow  heterogeneous  concentration  recovery

摘要:

长期注水开发加剧了油藏非均质性,形成优势流场,随着油田聚合物驱的扩大,聚合物沿高渗透条带窜流导致油井提前见聚,降低了驱油效率。通过并联岩心实验模拟高含水后期油田聚合物驱油,实验结果表明,不同渗透率级差下,岩心采收率提高程度不同,随着级差的增加,聚合物驱最终采收率降低,相同级差与注入速度条件下,岩心的采收率与聚合物的浓度密切相关,后续水驱过程中低渗透岩心的采收率大幅度提高,但高渗透岩心最终采收率均高于低渗透岩心。

Abstract:

With the water flood development,reservoir heterogeneous increase with development and form dominance flow region.During polymer flooding process,polymer often follow high penetrate layer break through and lead to decrease oil displacement efficiency.Simulating high water cut period polymer flooding process experiments to research crossflow law,results show that recovery efficiency change with heterogeneous.With heterogeneous increasing,ultimately recovery efficiency of polymer flood decrease,under the same heterogeneous,oil displacement recovery efficiency is related with polymer concentration.Recovery efficiency of low permeability will enhance more than that of high permeability during water flood after polymer flood,but ultimately recovery efficiency of high permeability higher than that low permeability.