Well age reflects the difference between the calendar year and the year the well started producing. U.S. crude oil production from the Lower 48 states from new wells (drilled since the start of 2014) made up 48% of total U.S. crude oil production in 2015, up from 22% in 2007. Production from new wells has grown as advances in horizontal drilling and completion techniques led to growth in oil production from low-permeability tight reservoirs. In 2015, production from tight formations—which include, but are not limited to, shale plays—accounted for more than 4 million barrels per day (b/d), or 50% of total U.S. oil production. U.S. oil production from tight formations increased from 0.5 million b/d in 2009 to 4.6 million b/d in May 2015, at which point decreasing oil prices contributed to declines in oil production. As […]