A record kept on the rig for each tour to show the footage drilled, drilling-fluid tests, bit record, and all important occurrences during that tour. (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}