Gloves back on, OPEC and U.S. shale producers to deepen ties in Vienna By: Reuters: Company News June 14, 2018 at 07:01 AM EDT * OPEC, shale cos must work in tandem to balance market-analysts Read More >> Related Stocks: Centennial Resource Development Inc ConocoPhillips Continental Resources Hess Corp Pioneer Natural Resources Tortoise Energy Independence Fd, Inc