Engineer, Mud or Drilling-Fluid : One versed in drilling fluids whose duties are to manage, carry through, and maintain the various types of oil-well drilling fluid programs. (Bul 10C, Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}