HOUSTON, Dec. 27 (Xinhua) -- The number of active drilling rigs in the United States stands at 589 this week, unchanged from the previous week but down by 33 from a year ago, according to the weekly data released Friday by Houston-based oilfield services company Baker Hughes.
These active drilling rigs include 483 oil rigs operating in U.S. oil fields, 102 gas drilling rigs and four miscellaneous rigs, all the same as the previous week.
