{"name":"Calvert Drilling Drilling Activity in Foster County, North Dakota","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/calvert-drilling/northdakota/foster","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":"ND","county":"Foster","totalWells":2,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":2,"topFormation":null,"rankInCounty":2,"firstPermitDate":"1956-07-26","lastPermitDate":"1956-07-31"}