“In 2015 nearly 77% of the most prolific U.S. oil wells, or those producing more than 400 barrels of oil equivalent (BOE) per day, were horizontally drilled wells. For about 85,000 moderate rate wells producing in 2015, defined here as more than 15 BOE per day and up to 400 BOE per day, 42% were drilled horizontally. Of the approximately 370,000 lowest-rate, marginal oil wells in 2015, also known as stripper wells, only about 2% were horizontal wells.”—EIA