【摘要】 由于非均质地层中不同渗流特性介质的压力传导速度不同,不定期地改变注水井的注入量可在储层中高渗透层和低渗透层之间产生不稳定的压力差,压力差产生油水交渗流动,弹性力使油被置换出来,从而达到提高原油采收率的目的。现场生产实践表明,在达到相同的采出程度时,常规注水的含水率高于不稳定注水的含水率;不稳定注水的最终采收率明显高于常规注水的最终采收率。更多还原

【Abstract】 Pressure conductivity rate is different in media with different seepage features in heterogeneous formation. Injection water rate variably changed triggers a pressure difference between high and low permeable formations. Both of them can change the elasticity of reservoir rock and fluids. Pressure difference makes oil and water inter-flow and oil be replaced by elasticity. Therefore, oil recovery factor can be improved. Field production reflects that water cut of conventional water injection is higher than that of unstable water injection at the same recovery factor. The ultimate recovery factor of unstable injection is higher than that of conventional injection.更多还原