document: PetroRio has agreed to the acquisition from Chevron of the latterâs 51.74% interest + operatorship in the Frade field + 154-sq km lease, Campos Basin, boosting PetroRio's interest here from 18.26% to 70%. Until now, Chevron (op), partners Petrobras + PetroRio.
summary: Brazil, Frade