西南石油大学学报(自然科学版)

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Processing Method to the Data of Relative Permeability in Unsteady
State Displacement

Dong Dapeng   

  1. Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,CNPC,Daqing,Heilongjiang 163712,China
  • Online:2014-12-01 Published:2014-12-01

Abstract:

JBN method is compared with Jones′ graphical technique by formula deriving and converting. It is concluded
that the essential difference between the two methods is the different reference permeability of the rock. When calculating
relative permeability,oil permeability at irreducible water saturation is a more suitable reference than the flowing ability of
oil and water. The author made a comparison among Polynomial function,logarithmic function and exponential function
when fitting average water saturation and total injection volume. The result shows that logarithmic function and exponential
function have good fitting accuracy if piecewise fitting is carried out. Furthermore,oil ratio calculated by these two fitting
function is more reasonable. We obtain similar oil relative permeability but quite different water relative permeability when
using different functions to fit 1/Qi and 1/(IQi). Linear function,polynomial function and power function are compared,and
the result calculated by power function is more reasonable.

Key words: relative permeability, unsteady state, function-fitting method, data processing, JBN method