Hurricane Claudette also affected the oil industry. ExxonMobil, Chevron Corporation, ConocoPhillips, Royal Dutch Shell, Marathon Oil, Unocal Corporation, and Anadarko Petroleum all limited production and evacuated many of their workers. Chevron, which evacuated more than 1,800 workers, returned many of its workers on the day when Claudette made landfall. Unocal closed 23 rigs and platforms in the region. The combined closures stopped the daily production of per day of oil and of natural gas, which accounted for 15% of the total production in the Gulf of Mexico.