特高含水期厚油层层内剩余油研究方法——以济阳坳陷史南油田梁11断块为例

高含水期厚油层层内剩余油的分布异常复杂。针对史南油田梁11断块沙二段8油组2层反韵律厚油层非均质性严重的特点,细分层内沉积微相,划分均质段,建立厚油层层内三维静态模型,对单砂体进行了多层段的数值模拟,搞清层内建筑结构及剩余油分布,利用侧钻水平井、侧钻井、补孔改层、完善注采井网、间歇注水等措施挖掘厚油层剩余油潜力,提高了油藏采收率,实现区块控水稳油的目标。

Methodical Study on Remaining Oil in Thick Reservoir at Extra-high Water-cut Stage

At the high water-cut stage, the remaining oil distribution in thick oil reservoirs is abnormal and complex. In consideration of characteristics of severe heterogeneity in inverted reservoirs in the Es~ 8~2 _2 of Fault Block Liang 11 in Shinan Oilfield, inter-layer depositional microfacies is divided and homogeneous sections are classified. An inter-layer 3D static model is established for thick reservoirs. A multi-layer numerical simulation is performed on single sandbody for clarifying inter-layer structures and residual oil distribution, measures of sidetracking horizontal wells, sidetracking wells, reperforation perfecting injection-production well patterns and intermittent injection are used for tapping the potential of remaining oil, improving oil recovery factor for the purpose of water control and stable oil production in the block.