U.S. shale production has investors, traders pulling back Faith in OPEC’s ability to drain glut with cuts is receding Shale producers risk drowning in their own surplus — again. On Tuesday, oil slid into its first bear market in 10 months, falling 21 percent from its high for the year. The swoon dragged down driller shares amid concern that unceasing production from U.S. shale fields is overwhelming OPEC efforts to ease a global supply glut. Explorers who came of age at a time when ever-increasing production was rewarded with ever-higher prices are now having a bit of a déjà vu from their fall from grace in 2014. The S&P 500 Energy Index has lost 14 percent this year, while West Texas Intermediate crude, the U.S. benchmark, has fallen 19 percent. Buoyed by prices that hit $54.45 a barrel in February, U.S. explorers have boosted the number of rigs drilling […]