Nigeria ’s two oil unions entered the second day of an indefinite strike that they say will curb exports from the West African nation responsible for pumping more than a quarter of the continent’s crude. “You will soon begin to see shutdowns of our oil flow,” Emmanuel Ojugbana, a spokesman for the Petroleum and Natural Gas Senior Staff Association of Nigeria, said by phone. Ohi Alegbe, an Abuja-based spokesman for the Nigerian National Petroleum Corp. and the Oil Ministry, declined to comment on exports. While talks between union leaders and authorities have been agreed, “the time and date is not yet fixed,” the union official said. “As soon as we confirm the time for talks, we will engage them. But as I speak the strike is continuing.” Any reduction in pumping would coincide with a collapse in the price of Nigeria’s biggest source of revenue. Brent crude oil plunged […]