The United States may now be the world’s biggest crude producer, but the oil being produced in its prolific Permian basin is increasingly too light in density for domestic refiners or for exports, eroding prices for these orphan barrels. A drilling rig on a lease owned by Oasis Petroleum performs logging operations in the Permian Basin oil and natural gas producing area near Wink, Texas U.S. August 22, 2018. Picture taken August 22, 2018. REUTERS/Nick Oxford Over the past year, production from the Permian in West Texas and New Mexico has changed, with more super-light oil being extracted, as producers focus drilling in the western part of the basin. As those volumes increase and heavy crude supplies shrink, refiners are grappling with the mismatch in the density of oil they require and what the country produces, traders said. U.S. refineries, geared to mostly process heavier […]