Dogleg Severity : A measure of the amount of change in the inclination and/or direction of a borehole, usually expressed in degrees per 100 feet of course length. (Bul D20)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}