Oil pared its weekly advance as investors weigh supply reductions from the U.S. to Nigeria against the return of some output from Canadian producers after wildfires eased. Futures slid as much as 1.4 percent in New York after climbing 7.5 percent the previous three sessions. Prices pared losses after Exxon Mobil Corp. was said to invoke a legal clause allowing it to suspend shipments of Qua Iboe crude from Nigeria without breaching contracts. Militant attacks have cut the country’s output by as much as 600,000 barrels a day, while U.S. production decreased for a ninth week. Enbridge Inc. is readying its oil-sands pipelines for startup after the blaze in Alberta, according to Chief Executive Officer Al Monaco. Oil has rebounded after slumping to the lowest level since 2003 earlier this year on signs the worldwide glut is easing as U.S. output declines. The global surplus in the first half […]