A union has called for the shutdown of all American supermajor Exxon Mobil’s facilities in the Niger Delta.
It is not known whether members of the Nigerian oil workforce union had complied with the order.
Sources said there had been no impact on production in the notoriously dangerous delta.
Madubuezi Azubuike, who chairs the Petroleum and Natural Gas Senior Staff Association of Nigeria (PENGASSAN) in Rivers state, said the call followed the breakdown of talks with the company over sackings and was part of a strike that began last week.
The industrial action is in protest at the sacking of 150 workers in December, of which 82 were PENGASSAN members.
Nigerian labour unions have held a number of strikes in the last few months over the dismissal of oil workers.