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UPDATE 3-U.S. oil firms expand offshore production cuts, evacuations as storm approaches

Collin Eaton and Erwin Seba

approaches@ (Recasts first sentence with Exxon Mobil, adds details on storm and on oil company preparations)

HOUSTON, July 10 (Reuters) - Exxon Mobil Corp and Anadarko Petroleum Corp on Wednesday joined several other U.S. oil producers withdrawing staff from deepwater platforms in the U.S. Gulf of Mexico as what could be a major storm gathered.

The withdrawals helped push U.S. oil futures up 3.8% to more than $60 a barrel, and lifted gasoline prices. The U.S. Gulf of Mexico produces 17% of U.S. crude oil and 5% of natural gas. Gasoline futures also climbed more than 3.5% in New York trading.

A tropical depression is expected to form in the Gulf by Thursday, with the potential to strengthen to a hurricane by the weekend, according to the National Hurricane Center. The system could produce a storm surge and heavy rainfall from Louisiana to the upper Texas coast.

Exxon has evacuated nonessential staff from three platforms in the Gulf, but anticipates little effect on its production, spokeswoman Julie King said.

Anadarko, the third-largest U.S. Gulf producer by volume, is stopping oil and gas production and removing workers from its four central Gulf facilities: the Constitution, Heidelberg, Holstein and Marco Polo platforms. It is also evacuating nonessential staff from eastern Gulf platforms, the company said.

Royal Dutch Shell Plc expanded an earlier offshore evacuation to seven platforms and shut more production, the company said on Wednesday.

Operations at the Louisiana Offshore Oil Port, the only U.S. port where the largest crude tankers can load and unload, were normal on Wednesday morning, a spokeswoman said.

Oil refiners Motiva Enterprises' and Marathon Petroleum Corp were monitoring the developing storm and prepared to implement hurricane plans, the companies said.

Motiva's Port Arthur, Texas, refinery was one of four refineries in east Texas inundated by more than 5 feet (1.52 m) of rain in a single day during 2017's Hurricane Harvey.

Chevron Corp, Phillips 66, Exxon and Royal Dutch Shell were preparing for heavy rain and wind at refineries along the Gulf Coast, company representatives said. Exxon reported operations at its Gulf Coast refineries were normal on Wednesday morning.

Chevron has shut production at five Gulf platforms - Big Foot, Blind Faith, Genesis, Petronius and Tahiti - and has begun to evacuate all workers at those offshore facilities, spokeswoman Veronica Flores-Paniagua said.

BP Plc, the second-largest oil producer in the Gulf by volume, is shutting all production at its four Gulf platforms - Thunder Horse, Atlantis, Mad Dog and Na Kika - which produce more than 300,000 barrels of oil equivalent per day.

BHP Group Ltd was also removing staff from its two offshore energy platforms, according to a company statement.

Two independent offshore producers, Fieldwood Energy LLC and LLOG Exploration Company LLC, declined to comment. (Reporting by Collin Eaton and Erwin Seba in Houston; Editing by Alistair Bell and Matthew Lewis)