{"name":"Calvert Drilling Drilling Activity in Logan County, North Dakota","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/calvert-drilling/northdakota/logan-nd","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-08-06","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Calvert Drilling","operatorSlug":"calvert-drilling","state":"ND","county":"Logan","totalWells":9,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":9,"topFormation":null,"rankInCounty":1,"firstPermitDate":"1956-12-26","lastPermitDate":"1957-02-26"}