Rig site Drilling engineering (Drilling manager, drilling engineer, company man, Driller, Rig manager, HSE engineer, Rig Crew, ..,etc)
Special engineering consultants (mud engineer, directional engineer, wellhead engineer, completion tools engineer, Bit runner, instrumentations engineer, reservoir engineer, production engineer, civil engineer, storage tanks design engineer, M/LWD engineer, logging engineer…, etc)
Rig site (Mechanical engineer & electrical engineer)