HOUSTON, Feb. 14 (Xinhua) -- The number of active drilling rigs in the United States stands at 588 this week, up by two from the previous week but down by 33 from a year ago, according to the weekly data released Friday by Houston-based oilfield services company Baker Hughes.

These active drilling rigs include 481 oil rigs operating in the U.S. oil fields, up by one from the previous week, 101 gas drilling rigs, up by one from last week, and six miscellaneous rigs, the same as the previous week.

The rigs include 572 land drilling rigs, two inland water rigs, and 14 offshore drilling rigs.

Of them, 51 are directional drilling rigs, 524 are horizontal drilling rigs and 13 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. Enditem

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