Oxy operates numerous gas processing facilities near its producing operations. These facilities typically use refrigeration and compression to eliminate water and separate hydrocarbon liquids in order to make saleable natural gas and liquid petroleum products.

Some of the largest of these facilities are located near Oxy's carbon dioxide (CO₂) floods in the Permian Basin of West Texas and southeast New Mexico. These plants separate the produced CO₂ from the gas, creating a saleable hydrocarbon gas and reclaiming the CO₂ to use in Oxy's enhanced oil recovery projects. The Century Plant in Pecos County, Texas, which began operation in late 2010, processes natural gas with high-CO₂ content, yielding methane gas for the market as well as providing a major new source of CO₂ for Oxy's Permian operations.

In California, Oxy completed construction of a cryogenic gas processing plant at the Elk Hills Field in Kern County. The plant became operational in the third quarter of 2012. The new plant's capacity of 200 million cubic feet per day will bring Elk Hills' total gas processing capacity to more than 600 million cubic feet per day — enough natural gas to supply nearly half of California’s residential consumers. This plant is the biggest in the state, bolstering Elk Hills' status as a regional gas hub for California.