The high costs and great difficulty to study and predict oil flow behavior inside natural reservoirs by using experimental methodologies make the numerical simulation become a mandatory tool in this area. The numerical simulation allows, with the use of appropriate mathematical models and inside the characterization parameters’ precision, to predict the multiphase flow of water-oil-gas in the reservoirs, helping geologists and engineers to know and improve reservoir characterization. One of the parameters of rock characterization is the relative permeability, which describes in quantitative form the interaction of two fluids in a flow process. This property is one of the most important parameters to be studied in a reservoir, and its accurateness is a determinant factor in the production behavior prediction of an oil reservoir.

The main features of ReIP software are:

• Relative Permeability calculation through the conventional method of Jones and Roszelle, and implicitly based on parametric curves of Relative Permeability;
• Smoothing of experimental data through its adjustment to analytical expressions;
• Visualization functionalities, data editing and graphic comparison;
• The use of a concept of hypothesis for the determination of relative permeability curves, to allow the comparison between curves obtained by different methods;
• Generation of reports in files;
• A friendly graphical user interface for data edition, visualization and determination.