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...

U.S. crude oil imports from Saudi Arabia and Iraq, two of the United States’ main sources for imported crude oil, have risen since reaching relatively low points in 2014 and 2015. On a combined basis, crude oil imports from these countries are the highest since late 2012. However, recent market developments, including the November 2016 agreement among certain members of the Organization of the Petroleum Exporting Countries (OPEC) to reduce production and the recent widening of price differences between Dubai/Oman crude oil and U.S.-produced Mars crude oil, suggest that U.S. imports from Saudi Arabia and Iraq are now becoming less attractive to U.S. refiners.

In late 2016, high production in Saudi Arabia and Iraq, as well as seasonally low internal demand in Saudi Arabia, contributed to record crude oil exports from Iraq and near-record exports from Saudi Arabia, according to data from the Joint Organizations Data Initiative (JODI). Saudi crude oil exports reached 8.3 million barrels per...

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