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永乐油田随着开发时间的延续,开发效果逐年变差,出现了主力油层单一,层间矛盾突出,产量递减幅度增大。而周期注水是通过改变注水量或注水方向使不同渗透性的地层间产生压力差,导致油水重新分配,充分发挥中低渗透层的生产潜力,从而提高注水波及系数和最终采收率。本文通过具体分析,总结出在影响周期注水的地质因素及在不同开采状况下的开发效果。
With the development of Yongle Oilfield continues, the development effect becomes worse year by year, there is a single main oil layer, prominent contradictions between layers, the output decline increases. The periodic water injection is to change the water injection amount or water injection direction to make the pressure difference between different permeable strata, resulting in the redistribution of oil and water and giving full play to the production potential of medium and low permeable layers, thus improving the water injection coefficient and ultimate recovery ratio. Through concrete analysis, this paper summarizes the geological factors affecting the water injection cycle and the development effect under different mining conditions.