Crews have successfully drilled more than 18,437 feet to tap Sweetwater County’s Madison Limestone formation. The engineering feat, which took months, is a major step toward establishing what developers hope will be one of the largest carbon dioxide storage projects in the U.S.

At 3.5 miles, it’s the deepest Class VI carbon dioxide injection well in the U.S., according to project officials, and it is the second well completed for the Sweetwater Carbon Storage Hub project. It is part of the public-private Wyoming CarbonSAFE program, which aims to identify geologic formations to permanently store carbon dioxide from industrial facilities in the region.

The average depth for an oil or natural gas well in Wyoming is about 8,000 feet or 1.5 miles, according to industry sources. Anything more

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