These U.S. oil companies are most at risk in the danger zone

Antero Midstream Corp Apache Corp Archrock Inc CNX Resources Corp Callon Petroleum Company Consol Energy Inc Core Laboratories Ord Shs Denbury Resources Exterran Corp Gulfport Energy Corp Halliburton Co Kinder Morgan Laredo Petroleum Holdings Inc Marathon Petroleum Matador Resources Company Nabors Industries Noble Corp Noble Energy ONEOK Oasis Petroleum Inc Occidental Petroleum Par Petroleum Corp Penn VA Corp Range Resources Sm Energy Company Southwestern Energy Tetra Technologies U.S. Silica Holdings Inc Williams Companies