Number of active U.S. drilling rigs up this week

HOUSTON, July 22 (Xinhua) -- The number of active drilling rigs in the United States increased to 758 this week, up by two from the previous week and 267 from this time last year, according to the weekly data released Friday by Houston-based oilfield services company Baker Hughes.

These active drilling rigs included 599 oil rigs operating in U.S. oil fields, unchanged from the previous week; 155 gas drilling rig