Natural gas spewed uncontrolled from a well off the Louisiana coast on Tuesday after a blowout that forced the evacuation of 44 workers aboard a drilling rig, authorities said.

No injuries were reported in the midmorning blowout and there was no fire as of Tuesday evening at the site, about 88.5 km off the Louisiana coast in the Gulf of Mexico.

Eileen Angelico of the Bureau of Safety and Environmental Enforcement (BSEE) confirmed the incident to The Associated Press.

The drilling rig involved was evacuated early Tuesday when the blowout occurred.

Experts from Wild Well Control Inc. were to assess the well site overnight and develop a plan to shut down the flow of gas, said Jim Noe, executive vice president of Hercules Offshore Inc., owner of the drilling rig where the blowout occurred, and a contractor for exploration and production company Walter Oil & Gas Corp.

Mr. Noe stressed that gas, not oil, was flowing from the well. He said it is an important distinction because gas wells in relatively shallow areas this one was in 47 metres of water sometimes tend to clog with sand, effectively snuffing the wells out. “That is a distinct possibility at this point”, he said. “But until we have our Wild Well Control personnel on the rig, we won’t know much more.”

Tuesday’s blowout occurred near an unmanned offshore gas platform that was not currently producing natural gas, said Ms. Angelico. The workers were aboard a portable drilling rig known as a jackup rig.

She added that it wasn’t immediately clear what caused the gas to ignite. And it wasn’t known what efforts to extinguish the blaze were being made early on Wednesday.

The Coast Guard and BSEE kept state and coastal officials apprised of the well’s status. “According to federal officials, there is no imminent danger at this time”, said Kevin Davis, head of the Louisiana governor’s homeland security office said.

Still, the Coast Guard kept nautical traffic out of the area within 500 metres of the site, where the spewing gas posed a fire hazard. The Federal Aviation Administration restricted aircraft up to 610 metres above the area. BSEE said a firefighting vessel with water and foam capabilities would reach the scene by Tuesday night.

BSEE said inspectors flying over the site soon after the blowout saw a light sheen covering the area. However, it was dissipating quickly.

Walter Oil & Gas reported to the BSEE that the rig was completing a “sidetrack well” a means of re-entering the original well bore, Ms. Angelico said. The purpose of the sidetrack well in this instance was not immediately clear. Industry websites say sidetrack wells are sometimes drilled to remedy a problem with the existing well bore.

“It’s a way to overcome an engineering problem with the original well”, Ken Medlock, an energy expert at Rice University’s Baker Institute said. “They’re not drilled all the time, but it’s not new.”

Earlier this month, a gas well flowed for several days before being sealed off the Louisiana coast. In 2010, an oil rig exploded off the state’s coast, leading to a blowout that spewed millions of gallons of oil into the Gulf in the worst offshore disaster in the United States.

Coastal officials stressed that Tuesday’s blowout was nothing of that magnitude.

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