Rio de Janeiro (Platts)--21Oct2014 Financially troubled Brazilian oil producer Oleo e Gas Participacoes, or OGPar, expects output from its flagship Tubarao Martelo field to peak at about 30,000 b/d in 2016, the company said Tuesday. OGPar, formerly known as OGX, will invest $200 million-$500 million at the field over the next few years to drill two additional product..