HOUSTON- Energy firms and ports along the U.S. Gulf Coast were bracing on Tuesday for another test as Hurricane Zeta, the 11th hurricane of the season, entered the Gulf of Mexico.

BP, Chevron and Equinor evacuated oil workers and Royal Dutch Shell paused drilling as winds intensified on Monday. Pipeline operator Enbridge evacuated two offshore platforms and on Tuesday plans to remove workers from a Louisiana natural gas processing plant.

Some oil producers were pulling workers for at least the sixth time since June, a process made more difficult by the novel coronavirus pandemic with workers required to be tested for the virus before returning to work.

Zeta was the third named storm this month to hit Mexico's Quintana Roo state, forecasters said, setting a new record for the month. Winds decreased to 70 miles per hour (110 kph) after sweeping across the Yucatan Peninsula but are forecast to rise to 85 mph as its churns over the Gulf of Mexico, the NHC said.

On Monday, it became the 11th hurricane of the Atlantic season, which on average has six.

A hurricane watch was issued for parts of Louisiana to the Mississippi-Alabama border by the U.S. National Hurricane Center (NHC). Zeta could hit the U.S. coast on Wednesday at or near hurricane strength, the NHC said.

Energy ports from Baton Rouge to Pascagoula were operating under advisories warning of the potential for gale force winds. A Louisiana deep water oil export port said it was implementing its inclement weather plan.

Energy producers shut 16%, or 293,656 barrels per day (bpd) of oil and 6% of natural gas output, or 162.57 million cubic feet per day, according to data from the U.S. offshore energy regulator.

U.S. Gulf of Mexico offshore oil production accounts for about 17% of total U.S. crude oil output and 5% of total U.S. dry natural gas production.

Crude futures gained 1% in London trading after falling more than 3% on Monday over fears of rising COVID-19 cases and increased crude supplies. 

(Reporting by Erwin Seba Writing by Gary McWilliams Editing by Robert Birsel and David Holmes) ((Gary.McWilliams@thomsonreuters.com; +1 713-210-8513;))