新疆石油地质

新疆石油地质 ›› 2016, Vol. 37 ›› Issue (zk(English) ): 73-77.

• RESERVOIR ENGINEERING • 上一篇    下一篇

Analytical Method of Water Displacing Oil Theory

GAO Wenjun1, FU Yanxin2, PAN Youjun1, XU Yunheng1, XU Ying1, ZHANG Debin1, WANG Shaoxia1   

  1. 1. Research Institute of Exploration, Development, Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China;
    2. Shanghai Branch Research Institute, CNOOC, Shanghai 200030, China
  • 出版日期:2017-01-01 发布日期:2021-05-24
  • 作者简介:GAO Wenjun,E-mail:gaowj7132@petrochina.com.cn

Analytical Method of Water Displacing Oil Theory

GAO Wenjun1, FU Yanxin2, PAN Youjun1, XU Yunheng1, XU Ying1, ZHANG Debin1, WANG Shaoxia1   

  1. 1. Research Institute of Exploration, Development, Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China;
    2. Shanghai Branch Research Institute, CNOOC, Shanghai 200030, China
  • Online:2017-01-01 Published:2021-05-24
  • About author:GAO Wenjun,E-mail:gaowj7132@petrochina.com.cn

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摘要： Based on the previous high-accurate new oil-water relative permeability studies, this paper establishes a new relationship between oil-water relative permeability ratio and water saturation. Combined with Leverett function and Welge equation, it deduces the analytical formulae for waterflood frontal water saturation, waterflood post-frontal average water saturation, water-breakthrough average water saturation and oil displacement efficiency, in order to calculate waterflooding indices and automatically draw relative the classic curves. The case study from Qiuling oilfield shows that this analytical method is not only used to calculate the waterflood rontal saturation and other indices, but also draw such classic curves as the oil displacement efficiency vs. injected fluid volumes, water cut vs. injected fluid volumes, etc.

关键词: water displacing oil theory, relative permeability ratio, fractional flow equation, Welge equation, analytical formula

Abstract: Based on the previous high-accurate new oil-water relative permeability studies, this paper establishes a new relationship between oil-water relative permeability ratio and water saturation. Combined with Leverett function and Welge equation, it deduces the analytical formulae for waterflood frontal water saturation, waterflood post-frontal average water saturation, water-breakthrough average water saturation and oil displacement efficiency, in order to calculate waterflooding indices and automatically draw relative the classic curves. The case study from Qiuling oilfield shows that this analytical method is not only used to calculate the waterflood rontal saturation and other indices, but also draw such classic curves as the oil displacement efficiency vs. injected fluid volumes, water cut vs. injected fluid volumes, etc.

Key words: water displacing oil theory, relative permeability ratio, fractional flow equation, Welge equation, analytical formula