RIO DE JANEIRO--Brazilian President Dilma Rousseff said Thursday that she views oil-industry requirements to use locally produced equipment and services as well as a more state-controlled regulatory scheme for key drilling areas as central to her energy strategy, damping investors" hopes for an overhaul.

Experts say both policies have deterred private investment in Brazil's energy sector and proven burdensome for state-run Petróleo Brasileiro SA. Rules demanding high levels of local content in the sector have contributed to delays and cost overruns for everything from drill rigs to refinery projects. And so-called production-sharing agreements, part of a regulatory framework Brazil adopted in 2010, allow tighter government control than an alternative model of concessions that is more friendly to investment.

Both Brazil's energy minister and Petrobras" top executive have signaled in recent weeks they would favor loosening the regulations, which Ms. Rousseff's Workers" Party adopted in the wake of massive oil discoveries off the Brazilian coast in the past decade. But Ms. Rousseff suggested she isn't open to major changes.

"The local-content policy is not something that can be shunned," Ms. Rousseff said in a speech at a Brazilian shipyard as a brand-new oil tanker was setting off on its maiden voyage. "The local-content policy in my government is the center of a policy of recuperation of this country's investment capacity."

Ms. Rousseff said she also plans to continue allowing oil companies to compete for concessions only in high-risk blocks. In areas known to possess large volumes of high-quality petroleum, the production-sharing agreements--requiring Petrobras to be the sole operator--will be used.

"No one can sanely think that it's a heavy burden for a company to have privileged access where there's oil, a lot of it, and of high quality," Ms. Rousseff said. "And that's what happens with Petrobras, in the case of the production-sharing model, from this government's viewpoint."

The firm has become the world's most indebted oil major in recent years as massive spending on fuel subsidies and expansion projects drained its cash. Petrobras has banned some two dozen of its biggest local suppliers from new contracts because of their alleged involvement in a huge corruption scandal being investigated by Brazilian prosecutors.

Chief Executive Aldemir Bendine said in a hearing at Brazil's Senate last month that any new well in the areas where Petrobras operates under production-sharing agreements would stress the company's finances due to a requirement that it hold a 30% minimum stake. Energy Minister Eduardo Braga, seeking to drum up enthusiasm at a recent oil conference in Houston, acknowledged the need to "fine-tune" local-content rules.

Brazil's Energy Ministry didn't respond to a request for comment Thursday.

Write to Paul Kiernan at paul.kiernan@wsj.com

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