双河油田Ⅳ1-3层系聚合物驱吸水剖面变化特征分析

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统计双河油田Ⅳ1-3层系聚合物驱吸水剖面资料发现,聚驱过程中层间和层内都存在吸水剖面返转的现象;层间吸水剖面具有变化类型多、差异大的特征,其中低渗透层返转时机晚、返转频率低、不吸水层数多,聚驱过程中累计吸水量和平均吸水强度也最低;纵向上含油层位越多,聚驱调整吸水剖面难度越大。从层内吸水情况来看,河道和河口坝砂层吸水剖面周期性返转,席状砂砂层层内吸水变化小,厚油层底部吸水强度大。根据研究结果,建议采取调剖或分注、分层分质的注入方式,提高低渗透层动用程度,改善聚合物驱开发效果。
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