反九点井网蒸汽驱物理模拟研究

PHYSICAL MODEL STUDY ON INVERTED NINE SPOT STEAMFLOOD IN THE NINETH BLOCK OF KARAMAY OILFIELD

用一套相似准则对反九点井网地质模型设计出真空相似物理模型,利用该模型研究了不同注入率下的蒸汽超覆现象、生产动态以及注入率对采收率、油气比的影响。研究结果表明,采收率和油气比总是与注入率直接相关的,并存在一个获得较高采收率和油气比的最佳注入率。此外,还讨论了角井和边井的相互影响。

With a set of similarity groups, a scaled physical model was fabricated, containingan injection well and two production wells and representing one eighth of an invertednine-spot steamflood pattern. The steam displacement, in particular, steam over-rideand production behaviour at different rates of injection is examined and the effect ofsteam injection rate on oil recovery and oil-steam ratio is studied in the model designedto simulate steamflood of a prototype reseivoir in Karamay oilfield. The results of themodel study demonstrated that a severe gravity override of steam taken place even thoughwell spacing was more close and that an optimal value of injection rate existed at which areasonable oil recovery and oil-steam ratio would be obtained.