新疆石油地质 ›› 2011, Vol. 32 ›› Issue (4): 409-411.

• 应用技术 • 上一篇    下一篇

裂缝性低渗透油藏弹性采收率计算新方法

张晓亮, 张金庆   

  1. 中海石油研究总院开发研究院,北京 100027
  • 收稿日期:2010-10-25 出版日期:2011-08-01 发布日期:2020-08-19
  • 作者简介:张晓亮(1983-),男,内蒙古通辽人,助理工程师,油气田开发,(Tel)010-84526464(E-mail)zhangxl16@cnooc.com.cn.
  • 基金资助:
    国家重大科技专项(2008YXKJB-02)

Calculation Method of Natural Depletion Oil Recovery for Micro-fractured Low Permeability Reservoirs

ZHANG Xiao-liang, ZHANG Jin-qing   

  1. CNOOC Research Institute, Beijing 100027, China
  • Received:2010-10-25 Online:2011-08-01 Published:2020-08-19

摘要: 结合非达西渗流理论,提出了能够同时考虑方向性非均质以及基质中流体渗流存在启动压力梯度的裂缝性低渗透油藏弹性采收率计算新方法。结果表明,考虑非达西渗流后裂缝性低渗透油藏极限泄油范围内弹性采收率为常规方法计算值的1/3,并从考虑非达西渗流后弹性采油量下降以及低渗透油藏的开发实践两方面阐述了1/3 结果的合理性,同时证明与低渗透油藏开发实际相吻合。

关键词: 微裂缝, 低渗透油藏, 弹性采收率, 启动压力梯度

Abstract: The conventional depletion oil recovery calculation method based on Darcy equation has certain limitations to fractured low-permeability reservoirs due to the strong anisotropy caused by the natural micro-fracture and the threshold pressure gradient of the matrix. A new depletion oil recovery calculation method is proposed, which can take both the reservoir anisotropy and the non-Darcy flow in matrix into consideration. The study indicates that the natural depletion oil recovery of fractured low-permeability reservoirs within the ultimate drainage radius is only one third of that calculated with the conventional method. The non-Darcy flow oil production decline and the field application are analyzed to verify the calculation rationality, and the calculation result has a good agreement with that of actual low-permeability reservoir development.

Key words: micro-fracture, low-permeability reservoir, natural depletion oil recovery, threshold pressure gradient

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