A 13 percent slide in crude oil prices since June has eroded some of the allure of drilling U.S. shale resources and raised investor concerns, but companies are pushing ahead as prices are still above the breakeven levels that might prompt a slowdown. U.S. light sweet crude traded in New York has dropped to around $93 per barrel from $107 in late June as supplies pumped from oily rocks in Texas and North Dakota grow and a strong U.S. dollar makes imports more attractive. On Thursday, shares of Bakken operator Continental Resources Inc stumbled as much as 8 percent after the company raised its capital budget for this year by $500 million to $4.55 billion and said some well completion techniques would be costlier. The company also replaced a key executive. But oil’s […]