A Halliburton facility sits behind a barbed wire fence on the outskirts of Williston, North Dakota January 23, 2015. Halliburton Co ( HAL.N ) said it had tapped BlackRock Inc ( BLK.N ) for $500 million to help fund drilling in existing shale wells, the first such move by a major oilfield services provider at a time when oil producers are shying away from drilling new wells. The world’s No.2 oilfield services provider, which is buying No.3 Baker Hughes Inc ( BHI.N ) to cope with a fall in demand, also reported a better-than-expected profit, helped by cost cuts. Market leader Schlumberger NV ( SLB.N ) and Baker Hughes have touted refracking, the practice of fracking existing wells, as means for oil producers to save money. Drilling normally accounts for about 40 percent of the cost of a new well. “Though a relatively small market today, we see significant […]