$BP, $CVX, $COP, $XOM, $RDSA, $TOT, $MTR, $AR, $SM, $CPE, $OAS, $LPI, $XOG, $CPG, $CDEV, $WLL, $PDCE U.S. crude oil drops below $15/bbl for the first time since 1999 in early trading https://t.co/M0eKKy1EwR