Drilling rigs are coming back to North Dakota. WPX Energy Inc, a small oil producer in the No. 2 U.S. crude state, said on Thursday it will add two rigs this year, becoming the first since the crude price downturn to announce concrete steps to boost output. Though only the 11th-largest North Dakota oil producer, trailing Whiting Petroleum Corp and others, WPX has effectively staked out a leadership position in the state’s Bakken shale formation by saying it will add rigs, slash well completion costs and target a 20 percent boost in output by 2016. Half a dozen other companies in the crowded U.S. shale industry have talked about adding rigs but have so far balked at making definite moves. Executives say they face a dilemma: they want to drill more to capture a recent upturn in prices, but worry widespread new rig deployments would cause prices […]