State oil and gas regulators are blaming mechanical failure for a natural gas well blowout in eastern Wyoming last month.
The Casper Star-Tribune reports Thursday that the Wyoming Oil and Gas Conservation Commission investigation also found that workers at the rig didn't properly engage part of the wellhead apparatus.
The blowout of the Chesapeake Energy Corp. natural gas well near Douglas occurred on April 27.
The well vented about 2 million cubic feet of gas and up to 31,500 gallons of oil-based drilling "mud" over nearly three days before workers were able to control it. No workers were injured.
The Oil and Gas Commission report says the integrity of the well itself was not compromised and the wellhead parts involved are still being examined.