The shale-oil drilling boom in the U.S. is showing early signs of cracking. Rigs targeting oil sank by 14 to 1,568 this week, the lowest since Aug. 22, Baker Hughes Inc. (BHI) said yesterday. The Eagle Ford shale formation in south Texas lost the most, dropping nine to 197. The nation’s oil rig count is down from a peak of 1,609 on Oct. 10. Drillers are slowing down as crude prices tumbled 24 percent in the past four months. Transocean Ltd. (RIG) said yesterday that its earnings would take a hit by a drop in fees and demand for its rigs. The slide threatens to curb a production boom in U.S. shale formations that has helped bring prices at the pump below $3 a gallon for the first time since 2010 and shrink the nation’s dependence on foreign oil imports. “We are officially seeing the slowdown in oil drilling,” […]