ANCHORAGE, Alaska (AP) — The president of Shell Oil Co. said Tuesday exploratory drilling off Alaska's northwest coast is going well despite stormy weather last week that caused the company to halt operations for a few days. [...] in an interview with The Associated Press Marvin Odum said he expects further protests against the company's plans for Arctic drilling like the ones in Seattle and Portland where activists in kayaks tried to block Shell vessels. Arctic offshore drilling is bitterly opposed by environmental groups that say a spill cannot be cleaned in ice-choked waters and that industrial activity will harm polar bears, walrus and ice seals already harmed by diminished sea ice. In Portland, Oregon, Greenpeace USA protesters hung from the St.