Theoretical Permeability Ratio : The theoretical permeability ratio (ki/ko) is the ratio of the ideal perforated permeability to the original effective permeability. (RP 43)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}