{"name":"Union Oil Co. Of California Drilling Activity in Isabella County, Michigan","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/union-oil-company-of-california/michigan/isabella","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-09-04","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Union Oil Co. Of California","operatorSlug":"union-oil-company-of-california","state":"MI","county":"Isabella","totalWells":83,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":"Antrim","rankInCounty":3,"firstPermitDate":"1929-02-11","lastPermitDate":"1948-12-13"}