石油化工高等学校学报 ›› 2025, Vol. 38 ›› Issue (6): 49-56.DOI: 10.12422/j.issn.1006-396X.2025.06.006

• 石油工程 • 上一篇    下一篇

基于油水相对渗透率比值的动态含油饱和度计算方法

毛伟()   

  1. 中国石油大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆 163712
  • 收稿日期:2025-03-06 修回日期:2025-05-10 出版日期:2025-12-25 发布日期:2025-12-07
  • 作者简介:毛伟(1971⁃),男,博士,正高级工程师,从事油藏工程方面的研究;E⁃mail:tamtsag@sohu.com
  • 基金资助:
    国家重大专项课题(2017ZX05013?006)

Dynamic Oil Saturation Calculation Method Based on Oil⁃Water Relative Permeability Ratio

Wei MAO()   

  1. Exploration and Development Research Institute,Daqing Oilfield Co. ,Ltd. ,PetroChina,Daqing Heilongjiang 163712,China
  • Received:2025-03-06 Revised:2025-05-10 Published:2025-12-25 Online:2025-12-07

摘要:

目前,众多计算含油饱和度的方法以静态法为主,主要用于计算原始含油饱和度,但难以适用于开发过程中动态含油饱和度的计算。针对现有动态法计算含油饱和度的不足,基于油水相对渗透率通式,推导出油水相对渗透率比值与含水饱和度之间的通用关系式,通过ln(1+x)级数展开,得到能够实现油水相对渗透率比值全程拟合且便于工程应用的三项式公式,克服了以往直线公式只能拟合中间段的问题;依据含水率定义及平面径向流公式,建立了油水相对渗透率比值与含水率的关系式;通过油水相对渗透率比值,建立了含水饱和度与含水率之间的三次多项式函数关系式,当已知区块、单井或单层的含水率时,应用该关系式即可求出不同开发阶段的含水饱和度,进而得到含油饱和度。研究方法可为加密井位部署、精细注水等调整措施的制定提供依据。

关键词: 相对渗透率比值, 含油饱和度, 含水饱和度, 平面径向流, 含水率

Abstract:

Currently, many methods for calculating oil saturation primarily rely on static methods, which are mainly used to calculate initial oil saturation and are not suitable for calculating dynamic oil saturation during the development process. To address the limitations of existing dynamic calculation methods, a general relationship between the oil?water relative permeability ratio and water saturation was derived based on the general formula for oil?water relative permeability. Through the ln(1+x) series expansion, a trinomial formula was obtained, which enables full?range fitting of the oil?water relative permeability ratio and facilitates engineering application,overcoming the drawback that previous linear formulas could only fit the middle range. By establishing the relationship between the oil?water relative permeability ratio and water cut through water cut definition and radial flow formulas, we further develop a cubic polynomial function relationship between water saturation and water cut. When the water cut of a block, single well, or single layer is known, this relationship can be used to calculate water saturation at different development stages, and then oil saturation can be derived. The research method can provide a basis for the deployment of encryption well position, fine water injection and other adjustment measures.

Key words: Relative permeability ratio, Oil saturation, Water saturation, Plane radial flow, Water cut

中图分类号: 

引用本文

毛伟. 基于油水相对渗透率比值的动态含油饱和度计算方法[J]. 石油化工高等学校学报, 2025, 38(6): 49-56.

Wei MAO. Dynamic Oil Saturation Calculation Method Based on Oil⁃Water Relative Permeability Ratio[J]. Journal of Petrochemical Universities, 2025, 38(6): 49-56.

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