{"name":"Gulf Refining Company Drilling Activity in Jefferson County, Illinois","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/gulf-refining-company/illinois/jefferson-il","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-08-06","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Gulf Refining Company","operatorSlug":"gulf-refining-company","state":"IL","county":"Jefferson","totalWells":144,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":null,"rankInCounty":1,"firstPermitDate":"1941-07-23","lastPermitDate":"2010-03-09"}