西南石油大学学报(自然科学版)

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Main Controlling Factors of Interlayer Interference in Big Intervals Commingled Production Oil Wells

Zhang Jicheng1,2*, He Xiaoru1,2, Zhou Wensheng2,3, Geng Zhanli2,3, Tang Engao2,3   

  1. 1. College of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China
    2. State Key Laboratory of Offshore Oil Exploitation,Chaoyang,Beijing,100027,China
    3. Beijing Research Center,CNOOC(China)Co.,Ltd.,Chaoyang,Beijing,100027,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

The oil wells with the commingled production with big intervals faced with the problem of serious interlayer heterogeneity.
By analyzing interlayers interference,the main controlling factors of interlayer interference are determined. Combining
field test practice,and by using interlayer interference coefficient as quantitative evaluation indicator of the degree of interlayer
interference,we carried out productivity test on some wells and found that the flowing pressure,drawdown pressure,water-cut
and other factors can affect the degree of interlayer interference. We collect data,and calculate the factors,including permeability
contrast,thickness contrast,layers,formation pressure coefficient contrast,drawdown pressure contrast,average viscosity,
porosity contrast,flowing pressure contrast and other factors. The multiple correlation coefficient method was adopted to screen
the factors. According to the grey correlation method based on weighted entropy,the correlation degree between the factors
and the interlayer interference coefficient was calculated. Permeability contrast,layers,formation pressure coefficient contrast,
commingled water cut,drawdown pressure contrast,flowing pressure contrast were determined as the main control factors.

Key words: interlayer interference, main controlling factors, interlayer interference coefficient, multiple correlation coefficient
method,
grey correlation method based on weighted entropy