多层非均质油藏水驱油跨度界限实验研究

Experimental research of spanning limitation on water flooding in multilayer heterogeneous reservoirs

基于岩心并联驱油实验方法,研究了不同埋深跨度、不同物性和埋深跨度组合以及调整注采参数对驱油效果的影响。结果表明:随着埋深跨度增加,层间压差的差异变大,浅层吸液能力受影响较小,中层次之,深层受影响程度最明显,通过提高埋深跨度可消除物性差异的影响;提高水驱注入强度,弱势储层启动,可提高总体采收率;根据水窜系数和驱油效率损失指标,明确了扶余油田目标区段合采开发时埋深跨度应控制的界限,从而克服层间干扰影响,优化层系开发。

Based on the experimental method of parallel rock cores displacement,it is studied that the influence of different buried depth span combining different physical property and the parameters of injection and extraction on the effect of oil displacement.The result shows that the interlayer pressure difference increases with the increase of depth span.The absorption capacity of the deep layer is the most obviously affected.while the shallow layer is the least affected.The effect of physical difference can be eliminated by increasing the depth of the buried span.Overall recovery rate increases with the increase of the injection strength and the start-up of the weak reservoir.According to the index of water channeling coefficient and displacement efficiency loss,it is clear that the embedded deep span should be controlled within the limitation in the development of target area in Fuyu oil field,to overcome the influence of interlayer interference and optimize the development of the layer system.