Plug Scores : Internal longitudinal grooves occurring in seamless pipe, usually caused by hard pieces of metal adhering to the high-mill plug. (Bul 5T1)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}