HOUSTON, Nov. 8 (Xinhua) -- The number of active drilling rigs in the United States decreased by five to 817 this week, down 264 rigs year-on-year, according to the weekly data released by Baker Hughes on Friday.
According to the Houston-based oilfield services company, these active drilling rigs included 684 oil rigs operating in the U.S. oil fields, down 7 from the previous week; 130 gas drilling rigs, unchanged from the previous week and three miscellaneous rigs, increasing by one from last week.
Of the 817 rigs, 793 are land drilling rigs, down 6 from the previous week, 23 offshore drilling rigs, up one, and inland waters drilling rigs remained at one.
Of them, 56 are directional drilling rigs, 710 are horizontal drilling rigs and 51 are vertical drilling rigs.
During the week, Alaska and California were the only two states that saw an increase of rig count with each of them adding one rig. New Mexico and Texas led the lost with four and three, respectively.
The number of horizontal drilling rigs this week decreased the most by 7, down 225 rigs year-on-year.
By far, the Permian basin has been the largest source of shale oil production growth in the United States, which has become the engine of supply growth outside the Organization of the Petroleum Exporting Countries in the past years.