Cleanup is underway after a well blowout in North Dakota on Saturday released an estimated 550 barrels of oil.
According to Reuters, the XTO Energy owned Deep Creek Federal 43X-5D well suffered a blowout during hydraulic fracturing operations and leaked about 23,100 gallons of crude and 110 barrels, or 4,620 gallons, of saltwater.
A pressure control valve failure may have caused the incident.
No injuries were reported and the blowout was brought under control on Sunday.
An estimated 90 barrels of brine and 450 barrels of oil have been recovered, the North Dakota Department of Health said.
Some of the leaked crude left the wellpad area and affected surrounding grass, Reuters added.
The well is located in Dunn County, about 18 miles southeast of Watford City.
“We are working to understand the cause. We are very sorry this incident has occurred,” XTO Energy told Reuters.
XTO Energy said its emergency response team responded to the blowout.