A New Method to Determine Residual Oil Saturation in Reservoir from Production Well-logging Data

Since there is no water and oil relative permeability data,the residual oil saturation(ROS) cann't be determined by production well logging method. This paper develops a new method to determine reservoir ROS by production well logging data. The relationship between water cut and relative permeability of oil and water is given based on Darcy law, and according to the empirical relationship between the relative permeability and water saturation,we can establish the relation between water cut and water saturation. We also discussed the effect of rock parameters and liquid characters on water cut.The relationship between water cut and water saturation in the formation of reservoir are given combined the conventional well logging data in open hole with production well logging data. On the basis of the empirical relationship,oil saturation is calculated from production profile.It gives a rational suggestion for extensive adjusting and developing of oil fields.