Chevron Corp completed a US$ 350 million purchase of a refinery in the Houston suburb of Pasadena, Texas, from Brazil’s Petrobras, Chevron said in a statement. The sale was agreed to in January, but Chevron put the transfer of the 112,229-barrel-per-day plant’s ownership on hold on April 2, telling Petrobras it had to prove the refinery would operate as promised.