Petroleo Brasileiro , Brazil 's government-run oil company , known as Petrobras , said it was in preliminary talks with Lyondell Chemical of Texas to buy its controlling stake in an oil refinery in Houston .
Brazil
Petrobras
/business/company_shareholder/major_shareholder_of
Petrobras
Brazil
/business/company/major_shareholders
LOCATION
Brazil
ORGANIZATION
Petrobras
LOCATION
Houston