HOUSTON, April 4 (Xinhua) -- The number of active drilling rigs in the United States stands at 590 this week, down by two from the previous week and by 30 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 489 oil rigs operating in U.S. oil fields, up by five from the previous week, 96 gas rigs, down by seven, and five miscellaneous rigs, the same as the previous week.

The rigs included 573 land drilling rigs, three inland water drilling rigs, and 14 offshore drilling rigs.

Of them, 48 were directional drilling rigs, 529 were horizontal drilling rigs and 13 were vertical drilling rigs.

So far, the Permian Basin in western Texas and eastern New Mexico has been the largest source of shale oil production growth in the United States, having become an engine of supply growth outside the Organization of the Petroleum Exporting Countries in the past years. Enditem

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