The company also now says it believes an oil sheen spotted near one of its platforms did not come from a pipeline leak, as originally thought.
The company and the feds are investigating a potential natural gas leak in Cook Inlet.
The state is fairly confident the final estimate for the oil spill in Cook Inlet won’t exceed 10 gallons, but pinning down exactly how much oil escaped won’t be easy.
The state doesn’t have its own estimate for how much oil was released into Cook Inlet or knowledge of what caused the leak. It’s latest in a string of incidents for Hilcorp, facing a wave of scrutiny from regulators and environmental groups.
State regulators on Monday said a leak from a crude oil pipeline in Cook Inlet was halted successfully.
After impact, workers on Hilcorp platform discover spill from an underwater pipeline in Cook Inlet.
The state is fining oil and gas company Hilcorp an additional $160,000 for using nitrogen without permission while working on two wells in 2015 — the same practice that nearly killed three North Slope workers.
Italian energy company Eni this month submitted an exploration plan to drill for oil in federal waters in the Beaufort Sea.
Regulators say an oil leak could cause much more environmental damage than the current natural gas leak. Both pipelines run through key habitat for endangered beluga whales.
State regulators have given preliminary approval to Hilcorp’s plan to monitor the environmental impacts of the gas leak in Cook Inlet.