Texas is one of the United States' leading oil producing states. The Eagle Ford Shale Play, located in Texas, is one of the most actively drilled targets for unconventional oil and gas. There were 68 oil rigs in the Eagle Ford region as of mid 2019. Texas is also the leading natural gas producing state in the U.S., though Pennsylvania, the second-largest gas producing state contains the Marcellus Shale Area along with West Virginia, which has the highest number of gas rigs in the country.
Due to the relatively high cost of oil and gas production in the U.S., the recent oil glut has been problematic for many U.S.-based production projects. However, technological advances have meant that shale oil and gas projects in the U.S. are increasingly viable, to the extent that shale oil production accounts for over half of the crude oil production in the U.S. as of 2018. This has caused the U.S. to become the world's largest oil producer as of 2018, when it produced three million barrels of oil per day more than Saudi Arabia. This impacts the U.S. economy as well as U.S. energy security.