U.S. oil drillers add rigs for 2nd time in 2016 -Baker Hughes

June 3 (Reuters) - U.S. energy firms this week added rigs drilling for oil for the second time this year, energy services company Baker Hughes Inc said on Friday, after crude prices briefly tested a seven-month high over $50 a barrel over the past two weeks. That is a key price level that analysts and producers have said would likely trigger a return to the well pad. Drillers added 9 oil rigs in the week to June 3, bringing the total rig count up to 325, compared with 642 a year ago, Bak