Transocean and Diamond Offshore, two major offshore oil and gas drilling contractors, said they had evacuated the families of expatriate workers from Egypt due to civil unrest in the country.
Officials for the two companies said the offshore rigs could sustain themselves for several days.
Transocean, which employs 1000 people in Egypt on land and offshore, said its Cairo office was closed along with the expatriate accommodation.
A spokesman told Reuters that the company kept a skeletal onshore presence to support its rigs.
The Switzerland-based company has 10 rigs in Egypt, including five currently working and one in the shipyard.
Diamond said about a dozen people had been evacuated, mostly the spouses and children of its staff, who support its three rigs working in the waters near Egypt.
A Diamond spokesman said the deep-water rig Ocean Endeavor, which moved last year from the Gulf of Mexico to Egypt to work for Burullus Gas Co, had recently managed a crew change.