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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.

WyomingUnited statesJeffrey nivitanontShane murphyDana caultonEric robertsonGraeme finleyMatt burkhartEnvironmental protection agencyCenters of excellenceUw school of energy resourcesUw department of atmospheric scienceUniversity of wyoming enhanced oil recovery instituteNational emissions inventoryMethane emissionsEnhanced oil recovery institute