Petrobras, the Brazilian state-controlled oil producer, posted an $11 billion impairment in the first quarter after revising down its outlook for crude prices. Even without the impairment, Petrobras reported a loss in the quarter on lower oil prices and the devaluation of Brazil’s real, the worst-performing major currency this year. While low oil prices have battered the industry, Petrobras ended up benefitting from the rebounding oil demand in China.