U.S. energy companies added 10 oil rigs this week, the biggest increase since June, as crude prices rose to their highest levels in three years, prompting drillers to return to the well pad. The total rig count rose to 752 in the week to Jan. 12, the most since September, General Electric Co’s Baker Hughes energy services firm said in its closely followed report on Friday. The U.S. rig count, an early indicator of future output, is much higher than a year ago when only 522 rigs were active after energy companies boosted spending plans in 2017 as crude started recovering from a two-year price crash. The increase in U.S. drilling lasted 14 months before briefly stalling in the second half of last year as some producers trimmed their 2017 spending plans after prices turned softer over the summer. “Drilling activity may not be up every week, […]