In 2019, the company's United States operations produced per day, representing 69% of the company's worldwide production, including per day in Permian Basin, where Occidental is the largest operator and oil producer. The company produced per day from unconventional oil directional drilling via Permian Resources and per day using a technique called enhanced oil recovery, whereby carbon dioxide and water are injected into underground formations to extract the oil and gas. The company also produced per day in the Denver Basin.