By Arathy Somasekhar

HOUSTON, July 5 (Reuters) - Tropical Storm Beryl is

expected to have little impact on U.S. offshore oil and gas

production, energy companies said on Friday while evacuating

personnel from some facilities out of caution.

Beryl was downgraded from a hurricane and shifted over

Mexico's Yucatan Peninsula with maximum sustained winds dipping

to 70 mph (113 kph), the U.S. National Hurricane Center said.

U.S. Gulf of Mexico offshore production of about 1.8 million

barrels per day accounts for about 14% of total U.S. crude

output, according to data from the U.S. Energy Information

Administration. Any impact on supplies could push up prices of

U.S. oil and offshore crude grades.

Oil major Chevron Corp ( CVX ), among the biggest U.S.

offshore producers, said production from its operated assets

remained at normal levels, adding that it evacuated nonessential

personnel from some of its Gulf of Mexico facilities.

The company said it demobilized personnel at its Anchor

project, where first production is expected in the third

quarter.

Producer Murphy Oil Corp ( MUR ) said it did not expect any

impact on operations and had not evacuated personnel. Hess Corp ( HES )

said it did not expect any impact to its Gulf

facilities.

Occidental Petroleum ( OXY ) said it was monitoring the

storm's path, adding that it had plans to prepare facilities for

weather-related events.

On Thursday, Shell said it evacuated staff at its

Perdido facility in the U.S. Gulf and safely shut in production.

At its Whale facility, which is not scheduled to begin

operations until later this year, it evacuated all personnel.

Some drilling operations in the area were paused.

Texas gasoline and diesel markets are well-stocked, so no

significant supply disruption is expected for the long term,

fuel distributor Mansfield Energy wrote in an email to clients.

LNG producer Cheniere Energy said there was no

impact to operations and it was monitoring the storm's

development.

The U.S. Coast Guard implemented Condition Whiskey, which

can limit ship traffic, for the Port of Brownsville along the

U.S.-Mexico border and the Port of Corpus Christi in south Texas

on Wednesday. Whiskey is set when gale force winds are expected

to arrive at the port within 72 hours.