UPDATE 1-Whiting would add rigs if oil prices hit $70 per barrel
April 30, 2015 at 13:32 PM EDT
WILLISTON, N.D., April 30 (Reuters) - Whiting Petroleum Corp , the top oil producer in North Dakota, plans to keep 11 drilling rigs operating through 2016, though it would add "a couple of rigs" if crude prices rise to $70 a barrel, its chief executive said on Thursday.