水驱优势通道下微观潜力分布及改变流线挖潜

发布时间：2018-03-30 02:00

本文选题：水驱　切入点：优势孔道　出处：《西南石油大学学报(自然科学版)》2017年05期

【摘要】：根据中高渗油藏优势通道孔喉分布特征,建立了具有不同优势通道发育规模的二维刻蚀模型,对优势通道下剩余油微观分布及演变特征进行了研究;通过分析不同改变流线动用方法适应性,初步揭示了优势通道下剩余油改变流线动用机制;结合油藏数值模拟,量化了改变流线动用策略。结果表明,提高驱替速度可使弱优势通道下剩余油大幅降低,而强优势通道变化较小;根据优势通道下剩余油赋存形态、形成机制,将其分成了4类,即死角式、并联式、包围式、绕流式,其中前两类受优势通道规模、驱替速度影响极小,而后两类仅在优势通道规模较小时,才会随驱替速度增加而大幅减小。应以利用与克服优势通道的角度去设计流线动用改变方式,在流线动用方式合理改变时,强优势通道注采比应适当降低,而弱优势通道相反。
[Abstract]:According to the pore throat distribution characteristics of dominant channels in medium and high permeability reservoirs, a two-dimensional etching model with different development scales of dominant channels is established, and the microscopic distribution and evolution characteristics of remaining oil under dominant channels are studied. By analyzing the adaptability of different methods of changing streamline production, the mechanism of residual oil changing streamline under dominant channel is preliminarily revealed, and combined with reservoir numerical simulation, the strategy of changing streamline production is quantified. The results show that, Increasing displacement speed can reduce the remaining oil in weak dominant channel significantly, but change little in strong dominant channel. According to the formation mechanism of residual oil in dominant channel, it can be divided into four types, that is, dead-angle type, parallel type, bounding type, and so on. The first two types are affected by the size of dominant channel and the displacement velocity is very small, while the latter two types are only small in the size of dominant channel. Only with the increase of displacement velocity, should we design the changing mode of streamline production from the angle of utilizing and overcoming the dominant channel. When the mode of streamline production changes reasonably, the injection-production ratio of strong dominant channel should be reduced properly, but the weak dominant channel should be opposite.
【作者单位】：中国石油勘探开发研究院;中国石油大学(北京)石油工程学院;中海油深圳分公司;
【基金】：国家科技重大专项(2011ZX05030) 中国石油科技项目(2016D-4401)
【分类号】：TE357.6

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