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The total number of wells producing crude oil and natural gas in the United States fell to 991,000 in 2017, down from a peak of 1,039,000 wells in 2014. This recent decline in the number of wells reflects advances in technology and drilling techniques. EIA’s updated U.S. Oil and Natural Gas Wells by Production Rate report shows how daily production rates of individual wells contributed to U.S. total crude oil and natural gas production in 2017.

Wells classified as nonhorizontal in the report—most of which are vertical wells—have decreased from 940,000 in 2014 to 864,000 in 2017. Horizontal wells are relatively less common, but they are growing as a share of the total: the 99,000 horizontal wells drilled in 2014 accounted for 10% of the total. In 2017, 127,000 horizontal wells accounted for 13% of total wells drilled.

Although horizontal wells are more expensive to drill than vertical wells, they contact more reservoir rock and therefore produce greater volumes. Only 1% of vertical wells...

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