埕岛油田馆陶组上段油藏合理产液量及注水量矢量优化方法

摘要

Chengdao oilfield has entered middle-high water cut stage.Due to the influence of strong reservoir heterogeneity,uneven waterline rush,serious interference of production in multi-well groups and the imbalanced displacement of injected water in the underground directly affect the overall development effect of the reservoir.Therefore,a vector optinization method for reasonable liquid production and water injection rate was proposed.Concept of displacement breakthrough coefficient was established,and equilibrium displacement limit was determined to be 3.The actual reservoir displacement was divided into 4 modes.Reasonable fluid production and water injection rate of oil-and-water wells under different displacement modes was determined,and thus the goal of balanced reservoir displacement could be achieved.This method was applied to field liquid increase test in seven well groups of Chengbei 11N well block.By the end of December 2015,incremental cumulative oil was 2.7× 104 t,and recovery rate was increased by 5％ in the evaluation period (15 a).%埕岛油田馆陶组上段油藏进入中高含水期后,受储层非均质性强、水线不均匀突进、多井组生产相互干扰严重等因素的影响,注入水在地下驱替不均衡,直接影响油藏的整体开发效果.为此,提出合理产液量及注水量矢量优化方法,建立驱替突破系数的概念,确定均衡驱替界限为驱替突破系数等于3,并将实际油藏驱替模式分为4种,确定适用于不同驱替模式下的油水井合理产液量和注水量,达到实现油藏均衡驱替的目的.应用该方法在埕北11N井区的7个井组进行了矿场提液试验,截至2015年12月累积增油量为2.7×104t,预计评价期内(15 a)采收率可提高5％.