Core-Flow Efficiency (CFE) : Core-flow efficiency is the ratio of the experimental permeability ratio to the theoretical permeability ratio, (kp/ko)/(ki/ko), for the same total core penetration. (RP 43)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}