BP's said it had sold its interest in a natural gas processing plant in Colorado to Andarko Petroleum for $575.5m (£351m).
The Wattenberg plant, located in the northeastern part of the state, has the capacity to process about 195 million cubic feet per day of natural gas and 15,000 barrels per day of natural gas liquids and gas condensate.
The sale follows BP offloading of other US assets after the Gulf of Mexico oil platform explosion which claimed 11 lives and sent the company into crisis mode.
Included in the sales have been a string of oilfields to Apache for $7bn. The group has a target of $30bn of sales by the end of the year.