U.S. oil drillers add rigs for 2nd week in a row -Baker Hughes

June 10 (Reuters) - U.S. energy firms this week added rigs drilling for oil for a second week in a row for the first time since August, energy services firm Baker Hughes Inc said on Friday, after crude prices this week rallied to an 11-month high over $51 a barrel. Analysts and producers have said U.S. crude prices over $50 would trigger a return to the well pad after a near two-year slump in drilling. Drillers added three oil rigs in the week to June 10, bringing the total rig count u