摘要
特高含水期水驱油特征和油水两相渗流规律研究表明,油藏进入特高含水开发阶段后,剩余油的分散程度增强;同时随着驱替倍数的增加,残余油饱和度会进一步降低,油藏物性也发生了变化,导致用常规数值模拟技术难以精确描述剩余油的分布。因此,需要研究特高含水期油藏数值模拟方法。在应用高驱替倍数相渗曲线的基础上,实现了数值模拟中的过水倍数的计算;提出了有效过水倍数的概念来反映真正的水驱油效果;建立了有效过水倍数与饱和度之间的关系;大大改进和完善了传统物性时变数值模拟技术。将上述特高含水期油藏数值模拟方法应用到胜坨油田胜二区74~81单元中,更准确描述了目前近极限含水阶段,剩余油局部完全水洗,局部相对富集的现状。
The reseach on water driving characteristics at extra-high water-cut stage and oil/water two-phase seepage flow patterns show that the remaining oil dispersion enhanced at extra-high water-cut stage.Simultaneously,with the increasing of displacement multiple,residual oil saturation will further reduce,and the reservoir property will change as well,which lead to more diffcult to describe the remaining oil.Therefore,the numerical simulation applied technologies at extra-high water-cut stage are needed to research.Based on the application of high displacement multiple relative permeability curves,the displacement multiple calculation is achieved in the numerical simulation.Concept of effective displacement multiple is proposed to reflect the true water and oil displacement efficiency.Establishing an relationship between effective displacement multiple and saturation,traditional time-varying numerical simulation technology are greatly refined and improved.Finally,the above-mentioned numerical simulation applied technologies at extra-high water-cut stage are applied to the second region 74 ~ 81 units of Shengtuo oilfield,describing the status of remaining oil locally completely washed,locally relative enrichment at the current stage.
出处
《科学技术与工程》
北大核心
2014年第5期215-218,共4页
Science Technology and Engineering
基金
国家科技重大专项重点项目(2011ZX05011)资助
关键词
特高含水期
高驱替倍数相渗曲线
有效过水倍数
时变
extra-high water-cut stage
high displacement multiple relative permeability curves
effective displacement multiple
time-varying
