Introduction Technological innovation in drilling and production has caused rapid growth in U.S. oil and natural gas production during the past few years. One way of developing deeper insight into this rapid growth is to probe how U.S. oil and natural gas wells have changed. This report looks at the distribution of wells by size and technology to understand these trends. U.S. oil production reached 9.97 million barrels per day (b/d) in December 2017 and 12.04 million b/d in December 2018, and U.S. natural gas gross withdrawals reached 97.59 billion cubic feet per day (Bcf/d) in December 2017 and 108.56 Bcf/d in December 2018 [1] . At the same time, the number of producing wells in the United States increased from 729,000 in 2000 to a high of 1,035,000 wells in 2014, then declined to 982,000 wells in 2018—mostly because of lower oil prices (Figure 1). Technological change is […]