Equitrans Midstream Corp. has flooded a natural gas storage well that had leaked for more than 10 days, releasing over 1 Bcf into the atmosphere, according to preliminary estimates. 

Equitrans

Spokesperson Natalie Cox told NGI the leak was discovered on Nov. 6. The company worked through a series of setbacks with Texas-based Cudd Well Control to stop the leak at the Rager Mountain Storage facility in Cambria County’s Jackson Township, about 70 miles east of Pittsburgh. No injuries were reported and area residents were not ordered to evacuate at any time.

Equitrans said crews flooded the well Nov. 19 to stop the flow of natural gas and placed one of two planned plugs. A second plug was set on Nov. 20 and cement was pumped into the wellbore above the plugs. 

Equitrans technicians found gas escaping from a small vent on the George L Reade 1 well after they responded. The well was drilled in 1965 to produce oil and gas before it was converted to storage. 

It is one of 10 operating storage wells at the facility, which has a capacity of 9 Bcf. Equitrans said the valve was working to relieve pressure from the casing as designed. 

The company said a “conservative estimate” pegged the leak at 100 MMcf/d. “We are unable to provide an accurate account of the gas loss until an inventory verification study is completed,” Cox said.

Pennsylvania Department of Environmental Protection spokesperson Lauren Camarda told NGI that regulators were at the site until the well was brought under control. 

The company said it would coordinate with federal and state regulators to complete a root cause analysis. An environmental assessment is also planned. 

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The facility in the center of the Appalachian Basin was full as the winter heating season gets underway. The leak represents a major loss of natural gas. 

By comparison, the Aliso Canyon storage facility near Los Angeles leaked 109,000 metric tons, or roughly 4 Bcf, over a 112-day period between October 2015 through February 2016. That incident was the largest methane release in U.S. history.