HOUSTON, April 5 (Xinhua) -- The number of active drilling rigs in the United States decreased to 620 this week, down by one from the previous week and by 131 from last year, according to the weekly data released by Houston-based oilfield services company Baker Hughes on Friday.
These active drilling rigs included 508 oil rigs operating in U.S. oil fields, up by two from the previous week; 110 gas rigs, down by two; and two miscellaneous rigs, down by one.
