WRAPUP 2-Tumbling oil prices slam profit at Exxon Mobil, Chevron
July 31, 2015 at 11:02 AM EDT
July 31 (Reuters) - Weak oil prices shriveled quarterly profit at Exxon Mobil Corp and Chevron Corp , compelling both companies to rethink operations and plan for what many expect to be a sustained period of cheap crude.