HOUSTON, Sept. 29 (Xinhua) -- The number of active drilling rigs in the United States rose to 623 this week, down by seven from the previous week and by 142 from this time last year, according to the weekly data released by Houston-based oilfield services company Baker Hughes on Friday.
These active drilling rigs included 502 oil rigs operating in U.S. oil fields, down by five from the previous week; 116 gas rigs, down by two; and five miscellaneous rigs, unchanged from last week.
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