Study on Relative Permeability Equation Adapted at Ultra-high Water-cut Stage

The relation between the oil and water relative permeability ratio and exponential expression of water saturation was not linear at ultra-high water cut stage.And the water-cut curve based on the linear law could not correctly describe the features at ultra-high water-cut stage.By using the mathematical analysis method and based on the water displacement experiment,a new relative permeability equation was established.After introducing the basic data to the equation and using the regression analysis method,a quantitative expression between relative permeability and water saturation is established,which is suitable for Wellblock Zhong14-J10 of certain oilfield in China,by which a fractional flow curve equation is improved.It provides a guidance for the oil development at high water-cut stage.