By Amy Harder And Daniel Gilbert 

WASHINGTON--The Obama administration on Monday proposed new offshore oil and natural-gas drilling regulations aimed at preventing the kind of explosion that erupted nearly five years ago on BP's Deepwater Horizon rig, including many provisions the industry has already adopted.

The Interior Department draft rule imposes tougher standards on equipment designed to keep control of a well, including blowout preventers, and requires real-time monitoring for certain kinds of drilling that are in deep water or are done at high pressures.

A blowout preventer, which is designed to seal off wells in emergencies, failed on April, 20, 2010, and helped lead to the explosion on the BP rig in the Gulf of Mexico, which killed 11 people and caused the biggest offshore oil spill in U.S. history.

Interior Department officials stressed the collaboration between government and industry in strengthening drilling standards.

"Both industry and government have taken important strides to better protect human lives and the environment from oil spills, and these proposed measures are designed to further build on critical lessons learned from the Deepwater Horizon tragedy and to ensure that offshore operations are safe," Interior Secretary Sally Jewell said on a conference call Monday.

The Interior Department is expected to issue a final rule later this year with an effective date three months after that. Acknowledging how long it takes for companies to install new technologies, the government is allowing between three and seven years for companies to comply with the rule, depending on the particular provision.

The government estimates that the rule will cost the industry $883 million over a 10-year period and have monetized benefits, such as time savings and potential reduction in oil spills, of $656 million over the same period.

Industry officials reacted cautiously to Monday's proposal.

"We are reviewing the proposed rules and hope they will complement industry's own efforts to enhance safety," Erik Milito, upstream director for the American Petroleum Institute, the nation's largest trade group representing all parts of the oil and gas industry. "Improved standards for blowout preventers are one of the many ways industry has led the charge to make offshore operations even safer."

Some environmentalists suggested the new regulations could be stronger and noted that the proposal simply mirrors a standard the industry has already adopted.

"Are we really strengthening safety or are we just making these [provisions] official?" said Jackie Savitz, vice president of U.S. Oceans at environmental group Oceana.

Write to Amy Harder at amy.harder@wsj.com and Daniel Gilbert at daniel.gilbert@wsj.com

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