RigFinder is a monthly subscription app ($6. 99/month - 3 day Free Trial - Cancel at anytime). RigFinder is a mapping application which locates oil & gas drilling rigs in North Dakota - Bakken. Search/sort by Rig Name, API Number, Well Name or Well Operator. Marks your Rig selection(s) on map. Mark as many Rigs as you would like. Shows all Rigs simultaneously.