| The government says the removing of fuel subsidies was necessary to free funds for infrastructure [Reuters] | 
Nigeria, Africa's largest oil exporter, sends about 40 per cent of  its oil to the US, making it the fifth largest producer of oil to the  United States.
 However, Nigeria relies on imports for around 85 per cent of its  domestic consumption because it lacks refining capacity. Strikes over  the lifting of a popular fuel subsidy that has led to prices more than  doubling at the pump are now threating oil output.
 The OPEC member's biggest oil union said it was ready to halt oil output if the government did not reinstate the subsidy, piling pressure on President Goodluck Jonathan to reach a compromise.
 But Robin Mills, head of consulting at Manaar, a Dubai-based energy  consultancy, told Al Jazeera that the halting of production will not  have much impact in the short term and that Nigeria can keep up the  exports.
"If a strike does happen to go on for more than a few days, then  there is the risk of the fuel reserves in the Niger Delta getting  depleted," he said.
 The strikes, which have been going on for almost a week, have not hit oil exports yet, according to traders and oil officials.
 This is partly due to the fact that processes are automated and  offshore operating platforms are not dependent on unionised workers.
 However, the threat of a cut in oil output was still apparently a  deciding factor in prompting the government to start negotiations with  union leaders.
 Ports closed
 Strikes have already forced ports to close, resulting in tankers being held outside ports at the expense of charterers.
 "Ports are shut, so yes it is affecting things. Nothing in or out at the moment," a fuel trader said.
 | Inside Story: Is Nigeria sliding into chaos? | 
Demurrage costs, about $8,000 a day, are payable to a ship owner by a  charterer. However, shippers say these costs have not increased despite  the current strike.
 "They [Nigerian shipments] are fairly prone to delays anyway but even  more than usual now with the strike. So far it's fairly flat," a  shipping source said.
 Fighters in the Niger Delta have caused widespread disruptions in the  past by attacking oil facilities, workers and also stealing oil.
 Mills said this violence in the delta is more significant than the union strikes.
 The Movement for the Emancipation of the Niger Delta  (MEND), the main group responsible for such disruptions, claims to be  seeking a redistribution of oil wealth and greater local control of the  sector.
 While the government has managed to reconcile with them and achieve relative calm, the risk of violence is still high.
 "There is always the risk of disruption in the delta due to the lack of delivery of public services," Mills said.
 Little oil benefits
 The government says the removing of fuel subsidies was essential to  allow much of the $8bn a year to be ploughed into improving the  country's woefully inadequate infrastructure.
 But people are united in anger against the scrapping of subsidies,  which they view as their only benefit from the nation's oil wealth.
 "The subsidy issue is politically very difficult - the government  will be saving lots of money that it could spend in the right way, but  the subsidy is the only thing that people see. They don't trust the  government to deliver," Mills said.
 "Most of the oil is exported, and on top of that, most of the  refining is done out of the country - the local refineries are state  owned and are run corruptly."
 Mills said that because the refined oil prices are very low, there is  lots of smuggling of refined product back out of the country.
 "And very important people are involved in this illegal trade in one way or the other," he added.
 The NNPC has four refineries, two in Port Harcourt, and one each in Kaduna and Warri - however, three of them are regularly out of service.
 Nigeria's refineries operate on a very low level, forcing them to  re-buy all their oil on the open international market for gasoline  sales, said Elizabeth Dickinson, a journalist covering Africa.
 Nigeria imports refined petroleum products from neighbouring Ivory  Coast as well as from Holland and England, Austin Oniwon of the Nigerian  National Petroleum Corporation (NNPC) was quoted as saying in a daily national newspaper.
 The Abuja-based Leadership newspaper reported in December  that out of the 445,000 barrels of oil allocated to the NNPC daily, only  170,000 were refined in the country.
 
