SÃ O PAULO—Brazil's state-controlled oil company Petroleo Brasileiro SA, or Petrobras, confirmed the sale of $2.5 billion in a 100-year bond, the latest sign of robust demand from investors for bonds that offer higher rates than safe government debt.

The company will pay an annual yield of 8.45%. Deutsche Bank and J.P. Morgan coordinated the operation, which attracted a demand of around $13 billion from investors, according to a person close to the operation, who declined to be named.

Petrobras became the second Latin America borrower to tap international debt markets with a century bond issue in recent weeks. Mexico's government in April sold a 100-year bonds worth €1.5 billion ($1.65 billion) with a yield of 4.2%.

Petrobras has tapped U.S. and European debt markets for tens of billions of dollars in recent years, paying yield-starved investors interest rates that often fell below 5%. Petrobras' free cash flow remains deeply negative as it continues to invest heavily to develop ultra-deep-water oil reserves off the coast of Brazil.

Last month, the company said interest and amortization on existing debt are expected to cost $21 billion this year, and capital expenditures are forecast at $29 billion. The company's operations, on the other hand, are seen generating only $25 billion in cash during 2015.

But with the biggest debt load of any major oil company, investors' willingness to lend more money to Petrobras at affordable interest rates remains to be seen. A corruption investigation by federal prosecutors alleging a massive bribery and kickback scheme around the company further damaged its credibility.

Petrobras wrote off more than $2 billion in 2014 related to the corruption allegations. The company considers itself a victim of the ploy and has begun filing a series of lawsuits against contractors who allegedly profited from it.

Write to Rogerio Jelmayer at rogerio.jelmayer@wsj.com

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