Unconventional wells that were hydraulically fractured and drilled horizontally accounted for 69% of all oil and natural gas wells drilled in the United States in 2016 and 83% of the total linear footage drilled in the nation, according to the Energy Information Administration (EIA). The unconventional wells accounted for about 10.7 million of the nearly 13 million feet of total drilled footage in 2016. About 670,000 of the 977,000 producing wells in the United States that year were hydraulically fractured and horizontally drilled. The combination of fracturing and horizontal drilling has contributed to increases in U.S. oil and gas production, which are expected to reach record levels this year. EIA said.