Growth in U.S. shale oil production is renewing supply-side concerns and sending crude oil prices into negative territory. File photo by Brian Kersey/UPI Jan. 19 (UPI) — Oil prices pulled away from the record territory set in previous sessions on Friday after reports validated concerns about supply-side strains from U.S. shale. A geopolitical risk premium emanating from North Korean nuclear tensions, U.S. sanctions on Iran and general global unrest helped push crude oil prices to fresh highs this year. The early January rally was supported by a late 2017 decision by the Organization of Petroleum Exporting Countries to extend an effort to balance an oversupplied market through this year. The rise of U.S. shale oil production, coupled with a previous OPEC policy to defend a market share with robust production, pushed oil prices to historic lows two years ago. OPEC’s new policy helped set a floor under crude oil […]