By Jeff Fick 

RIO DE JANEIRO--Brazilian state-run energy company Petróleo Brasileiro said Friday that it would offer voluntary buyouts to some workers as it attempts to boost productivity and cut costs amid a large spending plan to develop oil fields.

Petrobras said in a regulatory filing that the buyouts would be offered to workers age 55 and older. Petrobras currently employs 62,779 people, a company spokeswoman said. Petrobras didn't provide any further details about how many workers were being targeted.

The buyouts would help Petrobras reduce costs as the company spends $237 billion through 2017 to develop oil fields discovered off Brazil's coast. The undertaking has come at great cost to Petrobras, which has seen its debt more than quadruple to $86.5 billion as the company borrows heavily to finance the spending.

Petrobras said the buyouts would help the company meet targets set by the investment plan.

The move also could represent an effort by the government to reduce spending, which economists say contributes to higher inflation. Brazil ended 2013 with inflation at 5.91%, above the government's 4.5% target and the 5.84% rate in 2012. The upswing in prices frustrated the government and central bank, which had pledged to deliver a lower inflation rate last year.

State-run utilities holding company Centrais Eletricas Brasileiras SA announced a voluntary severance plan last year aimed at cutting costs so the company could boost investments. A person with knowledge of the plan said at the time that Eletrobras hoped to cut 5,000 workers.

Write to Jeff Fick at jeff.fick@wsj.com

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