砂岩油藏不稳定注水技术及应用效果监测方法

On Unsteady Water Injection Technology for Sandstone Reservoir and Its Development Effect

胜利油区砂岩油藏的储层非均质性影响了水驱开发效果,特别是油田进入高含水期后,油藏层间、层内及平面矛盾突出,储量动用不均衡。20世纪80年代末至今,胜利油区逐渐加大了不稳定注水技术的研究和应用力度。结合实验、油藏数值模拟研究及矿场应用效果,阐述了不稳定注水技术提高采收率的机理及应用条件,提出了配套的评价应用效果的监测方法。不稳定注水技术可以改善油藏水驱效果,提高油藏采收率;利用开发测井、生产测井、试井分析、检查井取心资料分析等方法,可以半定量、定量描述油藏水驱动用状况及剩余油分布的阶段动态变化,为不稳定注水工程参数的进一步优化提供依据。

Reservoir heterogeneity seriously affects the effectiveness of water flood development in sandstone reservoirs in Shengli Oilfield. In high water cut stage, the intrastratal and interformational contradiction becomes prominent and the use of the reserves is markedly imbalanced. Since the end of 1980＇s, the research and application of the unsteady water injection are gradually emphasized in Shengli Oilfield. Based on the experimental results, numerical simulation and field practices, the mechanism and the application condition of the unsteady water injection are expatiated. The effectiveness of the method is appraised through an integrated monitoring system. Unsteady water injection can improve the effectiveness of water flooding, and increase recovery efficiency. Using logging data （development logging, production logging, test analysis, coring analysis in monitoring wells, etc. ）, the dynamic changes of water displacement and residual oil distribution can be described quantitatively or semiquantitatively. The integrated monitoring also provides the basis for the parameter optimization in unsteady water injection.