高含水期水驱状况影响因素数值模拟研究

提出冲刷倍数和注水倍数的概念,利用数值模拟技术对高含水油田水驱状况影响因素进行了研究。分析了胜利油田孤东七区高含水油田韵律性、冲刷倍数、注水倍数对水驱状况的影响。研究表明,反韵律油层由于渗透率分布有利于注入水向下流动,导致水驱开发效果好于正韵律油层;油层冲刷倍数越大,剩余油分布越小,水驱开发效果越好;注水倍数在油田开发初期对采出程度影响很大,但在高含水期通过提高注水倍数来增加采出程度的效果不明显。针对试验区已进入高含水期的现状,结合水驱状况因素分析,提出了区块剩余油挖潜措施,经数值模拟表明能有效提高油田开发效果。

Numerical Simulation of Factors Affecting Water-flooding in High Water-cut Stage

Introduced is the conception of multiple of water washing and ratio of water injection volume and porosity volume and applied is numerical simulation to research factors that affect water flooding status in high water-cut stage of oil field and analyzed are effect of rhythmicity,multiple of water washing and ratio of water injection volume and porosity volume of Gudong area 7 of high water-cut oil field on water flooding status.For negative rhythm oil reservoir,water-flooding development effect will be better than that of positive rhythm because its permeability distribution is beneficial for flowing downward.The more the multiple of water washing of the oil layer,the smaller the remaining oil distribution and the better the water flooding development effect.Ratio of water injection volume and porosity volume has large effect on recovery percentage in early stage of oil field development.However,the effect will be less significant in high water-cut stage.Proposed are some measures for improving water flooding status and numerical simulation results show that the measures can effectively improve oil field development effect.