mud logging n.— «Tecton provides on-site rig monitoring and mud logging for the geothermal drilling industry. Mud logging is the term for testing and keeping track of the microscopic nature of rock and the presence of liquid in wells...
driller
n.— «Driller: loud ringing phone.» —“Revealed: how to chat up a senior clerk” by Nina Goswami TheLawyer.com July 13, 2007. (source: Double-Tongued Dictionary)