The disruptions are eating into company and government revenues, and contributing to concern about global supply that?s keeping oil prices 30% higher than a year ago.
While the price rise has offset some of the effect of the cuts, companies are turning to Nigeria?s deepwater fields or nearby West African countries, further from violence in the Niger River delta.
Shell Petroleum Development Co, or SPDC, a venture that?s 30% owned by Shell and 55% by state-run Nigerian National Petroleum Corp, is losing about two thirds of its normal output because of violence.




