U.S. energy firms added oil rigs for a record 21st week in a row, extending a year-long drilling recovery as producers boost spending on expectations crude prices will rise in future months. Drillers added 8 oil rigs in the week to June 9, bringing the total count up to 741, the most since April 2015, energy services firm Baker Hughes Inc said on Friday. That is more than double the same week a year ago when there were only 328 active oil rigs. The pace of those additions has slowed with a decline in crude prices over the past two months, with the average total added over the past four weeks falling to just 7. U.S. crude futures were trading around $46 a barrel, putting the front-month on track […]