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Wyoming's Abandoned Oil, Natural Gas Wells Said to Account for Under 1% of Methane Emissions

Wyoming’s Abandoned Oil, Natural Gas Wells Said to Account for Under 1% of Methane Emissions Abandoned and unplugged oil and gas wells in Wyoming may be responsible for no more than 1% of reported methane emissions from the state’s oil and gas operations, according to research by the University of Wyoming’s (UW) Enhanced Oil Recovery Institute (EORI).  A sample of 10 orphan wells surveyed in Wyoming’s Powder River Basin by UW’s Department of Atmospheric Science accounted for 651 milligrams/hour (mg/h) of methane emissions. For comparison, the researchers noted that the average dairy cow emits 11,900 mg/h of methane. 

UW, EORI Complete Study of Methane Emissions from Abandoned Wells | News

April 9, 2021 Abandoned and unplugged oil and gas wells are likely responsible for less than 1 percent of reported methane emissions from the state’s oil and gas operations, according to new research published by the University of Wyoming’s Enhanced Oil Recovery Institute (EORI). Sampling conducted at 10 such “orphan” wells in Wyoming’s Powder River Basin showed emission of minute amounts of methane, averaging 651 milligrams per hour. By comparison, the average dairy cow emits 11,900 milligrams per hour. Based upon that data and other considerations, the researchers calculated that the approximately 1,900 abandoned and unplugged wells in the state emit a total of 3.83 metric tons of methane per year. That’s less than 1 percent of reported methane emissions from all Wyoming oil and gas operations in the most recent National Emissions Inventory conducted by the Environmental Protection Agency.

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