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建立了模拟正、反韵律油藏的物理模型以及矿场可能出现的 9种注水模式。利用室内模拟实验和矿场实际应用验证了砂岩油藏不稳定注水提高采收率的机理 ,并量化了平面转网后不同韵律油藏采收率的增加值 ,得出了在不同注入方式下的注入孔隙体积倍数、采出程度、采出程度增加值等参数不同时的累积采油量。实际应用表明 ,不稳定注水缓解了油藏层内非均质的矛盾及层间矛盾 ,且正韵律油藏的注水效果优于反韵律油藏。通过转网缓解了油藏平面的矛盾 ,并且在不同含水阶段转网均可提高采收率。在胜利油区采用不稳定注水取得了明显的降水增油效果。
A physical model to simulate positive and negative rhythm reservoirs and nine water injection modes that may appear in the mine are established. The mechanism of unstable water injection to enhance oil recovery of sandstone reservoir was verified by laboratory simulation and field practical application, and the added value of oil recovery from different prosodic reservoir after plane transfer was quantified. The results show that under different injection modes Of the injection pore volume multiples, the degree of recovery, recovery of production value increases and other parameters of different cumulative oil production. The practical application shows that the unstable water injection alleviates the heterogeneity and interlayer conflicts in the reservoir layer, and the water injection effect of the positive rhythm reservoir is better than the reverse rhythm reservoir. Through the transfer network to ease the contradiction of the reservoir plane, and in different stages of water transfer can improve oil recovery. In the Shengli Oil Region, unstable water injection has made obvious effect of precipitation and oil increase.