‘Several large sheens’ observed after leak at Cook Inlet oil platform

Published: Apr. 1, 2017 at 8:41 PM AKDT
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UPDATE 9:20 P.M.:

State officials are investigating the cause of an oil leak that was discovered late Saturday morning near a Hilcorp platform in the Upper Cook Inlet, according to a report by the Alaska Department of Environmental Conservation.

According to the report, personnel working on Anna Platform “felt an impact to the platform” and noticed an oil sheen at 11:20 a.m. The exact time of the release, and the amount of oil leaked are unknown at this time, according to ADEC.

Hilcorp has shut-in production at Anna and the neighboring Bruce Platform. The company has also reduced pressure on a nearby 8 inch underwater oil line.

During an overflight of the area at 12:30 p.m., Hilcorp personnel saw six oil sheens, one of which was 3.5 miles away from the Anna Platform. But during a second overflight an hour later, no oil sheen was seen.

“The oil spill response vessel Perseverance arrived at the Anna Platform around 12:45 p.m. and scouted the area for sheens with no success,” ADEC wrote in the report. “Hilcorp has hired a diving contactor to investigate the line and conduct repairs. It is anticipated that this work can be conducted late next week.”


State officials on Saturday were investigating a leak from a Hilcorp oil platform in Cook Inlet, according the Department of Environmental Conservation.

“We can confirm there has been an oil leak today at the Anna Platform in Upper Cook Inlet,” wrote DEC spokesperson Candice Bressler in an email. “I know that several large sheens were seen.”

According to Bressler, Hilcorp has shut-in production on the platform. She said DEC will be releasing a situation report on the leak "soon."

The news comes as Hilcorp works to repair another leak from a natural gas pipeline, also in Cook Inlet. That leak was first identified on Feb. 7, according to the company’s website. Hilcorp on Monday said that it had reduced the pipeline to its minimum pressure to reduce the leak rate until repairs can be completed.

This is a developing story. Check back for updates.