The overall recovery efficiency of any fluid displacement process is given by the product of the macroscopic efficiency (or volumetric efficiency Ev x Ea - reservoir scale ) and the microscopic displacement efficiency, Ed (pore scale).

 

A simple utility is provided to quickly iterate between initial connate water saturation (Swc), remaining or residual oil saturation (Sor) and vertical and areal sweep efficiencies to calculate ultimate recovery factor from the following.

 

Ultimate Recovery Factor = Ed * Ev * Ea, where Ed = (1-Sor-Swc) / (1-Swc).

 

An example is shown below.

 

 

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