Iranian President Hassan Rouhani has voiced Tehran's readiness for boosting energy cooperation with Moscow, underlining the presence of Russian companies in various energy sectors in Iran.

"We have built capacity of up to 2.4 million b/d, but [we are] currently producing about 1.9 million b/d," Omar Farouk, the special adviser on international energy relations to Nigeria's oil minister of state, said on the ministry's twitter handle.

The court judgment released on Wednesday found that the companies owed nearly 484 billion CFA francs in royalties to the Chadian government. It did not explain why the penalties amounted to more than 90 times that amount.

Shell says a fire has forced it to close a key oil pipeline feeding Nigeria's strategic Bonny Export Terminal, which militants attacked last week.

“This period of low oil price is not a time to jeopardize Nigeria’s long term interests by showing Nigeria as a place not to be trusted, and projecting our business environment as unconducive,”

Nigeria's crude oil production disruptions are concentrated in the Niger Delta region, an oil-rich area bordering the Gulf of Guinea that is the mainstay of the country's crude oil production. Since the beginning of 2016, the Niger Delta Avengers (NDA) have conducted many attacks on oil and natural gas infrastructure throughout the region. Although not the only militant group conducting attacks in the region, the NDA is currently the most active.

The World Bank is downgrading its 2016 global growth forecast to 2.4 percent from the 2.9 percent pace projected in January. The move is due to sluggish growth in advanced economies, stubbornly low commodity prices, weak global trade, and diminishing capital flows.

"Memorandum of understandings (MoUs) worth over $80 billion to be spent on investments in oil and gas infrastructure, pipelines, refineries, power, facility refurbishments and upstream have been signed with Chinese companies,"

Oil production in Nigeria has risen to about 1.9 million barrels per day (bpd), from 1.6 million bpd, due to repairs and more than a week having passed since a major pipeline attack in the Niger Delta

“We’re looking to raise about $40 to $50 billion,” Kachikwu said in the Bloomberg interview. “Going to places like China, which have a huge capacity to put money in the oil sector, is very helpful.”

The Ugandan and Tanzanian governments are trying to fast-track a $4 billion oil pipeline that would connect landlocked Uganda to foreign markets even though construction won’t start in August as they originally indicated.

Nigeria's crude oil and condensate production has fallen almost 50% from the start of the year to around 1.1 million b/d.

The international oil company said on Wednesday it was co-operating with officials from both the Netherlands and Italy as they investigate the $1.1bn deal, which Shell signed five years ago alongside Eni, the Italian oil company.