{"name":"Hf Sinclair Corporation Drilling Activity in Effingham County, Illinois","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/hf-sinclair-corporation/illinois/effingham","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-08-06","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Hf Sinclair Corporation","operatorSlug":"hf-sinclair-corporation","state":"IL","county":"Effingham","totalWells":29,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":null,"rankInCounty":8,"firstPermitDate":"1972-05-20","lastPermitDate":"1998-04-01"}