Oil prices fell back nearly to unchanged, erasing almost 1.7% in gains on the day, after the U.S. oil-rig count rose for the first time in seven months. U.S. oil producers added 12 rigs last week, breaking 29 straight weeks of cuts. They are responding to prices that have rebound to and stayed at $60 a barrel and since late April. That convinced producers they could end months of massive cutbacks that started after the U.S. shale drilling boom flooded the market and sent prices crashing. But oil production has kept increasing even as drilling has been decreasing, making many investors fearful that more rigs in the fields could lead to another precipitous decline in prices. The U.S. benchmark price just yesterday broke below a $4 range it had traded in for two months. That jolt came after the U.S. Energy Information Administration reported domestic oil […]