大庆葡萄花油田降压开采数值模拟

Numerical simulation of depressurizing production in Putaohua Oilfield

赵春森 吕建荣 高丽娟

大庆石油学院提高油气采收率教育部重点实验室，黑龙江 大庆 163318 华北石化公司中心实验室，河北 任丘 062552

大庆葡萄花油田目前正处在高压高含水开发阶段，为有效缓解油藏压力较高、含水上升速度加快、油田可采储量迅速下降的趋势，提出了实施降压开采的水动力学方法，进行了注采系统调整的数值模拟研究，通过降低注采比的方式来达到降压降水的目的，采用了5种不同注采比对油田进行降压开采效果研究。模拟结果表明，全面停注的降压开采效果最佳，随着注采比的逐渐恢复，降压开采效果变差，得出了不同降压开采情况下的降压界限和降压速度，对葡萄花油田后期开发具有重要的指导意义。

Putaohua Oilfield of Daqing is in a development stage of high pressure and high water cut at present. To relieve the trend of
ascending velocity of water cut and fast decline of recoverable reserves, the depressurizing production was applied to complete the
regulation of water flooding regime by numerical simulation research in this paper. The purpose of decreasing pressure and water cut is
accomplished by decreasing the injection-production ratio. The paper adopts five different injection-production ratios to study the
result of depressurizing production in Putaohua Oilfield. The research result indicates that complete-stopping injection had the best
production effect, and that the effect of depressurizing production became poor with gradual recover of injection-production ratio.
Pressure drop limitation and pressure drop velocity was obtained at different injection-production ratio. These have important
significance forimproving developmenteffectsand test research on enhancing recovery ratios in latestage of the oilfield development.