Despite a strong rebound in oil prices, seeing them hit three-year highs, U.S. shale oil producers are sticking to their output discipline, Reuters reports , citing rig count data and industry insiders. While West Texas Intermediate has passed the $70-per-barrel mark that makes a lot more shale output profitable, producers are wary of bringing back too much production too quickly. Under other circumstances, drillers would have been adding rigs consistently, but this year, the rig count has been swinging between weekly additions and declines , according to Baker Hughes data. Reuters notes in its report that the last time WTI traded at $73 per barrel, there were more than 1,000 active drilling rigs in the shale patch. To date, there are some 470. Production also fluctuates. Last week, the Energy Information Administration estimated total national output of 11.1 million bpd for the week to June 18. That was down […]