HOUSTON, May 26 (Xinhua) -- The number of active drilling rigs in the United States fell to 711 this week, down by nine from the previous week and by 16 from last year, according to the weekly data released Friday by Houston-based oilfield services company Baker Hughes.
These active drilling rigs included 570 oil rigs operating in the U.S. oil fields, down by five from the previous week; 137 gas drilling rigs, down by four from last week; and four miscellaneous rigs, same as last week.
The rigs included 689 land drilling rigs, two inland water rigs, and 20 offshore drilling rigs.
Of them, 52 are directional drilling rigs, 642 are horizontal drilling rigs and 17 are vertical drilling rigs.
The Permian Basin in western Texas and eastern New Mexico has been the largest source of shale oil production growth in the United States, and an engine of supply growth outside the Organization of the Petroleum Exporting Countries in the past years. ■