A handful of optimistic U.S. shale drillers are sticking with plans to deploy more rigs in the coming months even as oil prices take a sharp dive well below many producers’ $60-a-barrel breakeven point. On Wednesday, Pioneer Natural Resources Co. became the first big company to publicly confirm it was drilling more wells, saying it had already added two rigs in the Permian Basin of Texas this month and would keep on adding two a month as long as the oil price “remains constructive.” Smaller shale oil producer WPX Energy Inc, whose operations are focused on North Dakota’s Bakken shale, said this week that its decision to add two rigs later this year was unaffected by a nearly $8 drop in crude prices since June to toward $50 a barrel. While half a dozen […]