{"name":"Calvert Drilling Drilling Activity in Richland County, Illinois","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/calvert-drilling/illinois/richland-il","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-09-04","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Calvert Drilling","operatorSlug":"calvert-drilling","state":"IL","county":"Richland","totalWells":123,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":null,"rankInCounty":4,"firstPermitDate":"1954-02-04","lastPermitDate":"2015-12-17"}