HOUSTON, Dec. 9 (Xinhua) -- The number of active drilling rigs in the United States stood at 780 this week, down by four from the previous week and up by 204 from last year, according to the weekly data released Friday by Houston-based oilfield services company Baker Hughes.
These active drilling rigs included 625 oil rigs operating in the U.S. oil fields, down by two from the previous week, 153 gas drilling rig
