Shell may be losing almost 50,000 barrels a day, says Rystad Royal Dutch Shell Plc and Exxon Mobil Corp. are the international oil companies most exposed to violence in the Niger River delta that has cut Nigeria’s output and fueled a rally in global crude prices, according to Rystad Energy. Shell and Exxon have the most production in vulnerable parts of the oil-rich region — onshore or near the coast, according to Per Magnus Nysveen, senior partner and head of analysis at the Oslo-based consultant. Shell is losing almost all of the 50,000 barrels a day it pumped in the delta last year, he said. That’s about a quarter of its output in the country. Exxon pumped 145,000 barrels a day last year — about half its Nigeria total — from shallow-water fields that could also be targeted, Nysveen said. The delta has been rocked by attacks since February […]