1) Driller 2) Oilman 1) Oil man of sorts 2) Oil prospector 3) Oilman 4) Petroleum production 
A wildcatter is an American term for a person who drills wildcat wells, which are exploration oil wells drilled in areas not known to be oil fields. A wildcatter notable for his success was Texan oil tycoon Glenn McCarthy. The term dates from the early oil industry in western Pennsylvania. For instance, the Titusville Herald noted in 1880: The ori...
[n] - an oilman who drills exploratory wells in territory not known to be an oil field
noun an oilman who drills exploratory wells in territory not known to be an oil field