The sun is seen behind a crude oil pump jack in the Permian Basin in Loving County, Texas, U.S., November 22, 2019. REUTERS/Angus Mordant/File Photo
Aug 1 (Reuters) - Shale producers Pioneer Natural Resources Co (PXD.N) and Devon Energy Corp (DVN.N) on Tuesday tightened budgets and warned of lower drilling and completions activity in coming months after a drop in oil and gas…