Norwegian operator Statoil has confirmed that its has no staff in the South American country as troubles continue.
President Nicolás Maduro has faced violent protests at his rise to power, with opposition groups often clashing with government forces in recent weeks.
Statoil said that in total three people have left the country “temporarily”.
The spokesman added: “I can confirm that Statoil’s expatriates in Venezuela are currently outside of the country, some of which is related to planned vacation time.”
Spanish firm Repsol are also believed to have pulled foreign staff out of the troubled country.
The Madrid headquartered company has been contacted for comment.
Chevron and Total are also said to have removed a small number of staff.
Oil output accounts for 95% of Venezuela’s foreign-currency earnings.
Violence escalated ahead of the July vote to elect members of the constituent assembly, with the opposition denouncing the move as a power-grab by President Nicolas Maduro. While the election faced accusations of fraud, including from the company that provided voting machines for the ballot, the new assembly convened last week. One of its first actions was to remove the chief prosecutor, who had been critical of the government.