Formation Damage 5 : The reduction of permeability in a reservoir rock arising from the invasion of drilling fluid and treating fluids into the section adjacent to the wellbore. Often called "Skin Damage". (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}