Pioneer Energy Services Corp. provides land-based drilling and production services to oil and gas exploration and production companies. It provides contract land drilling services in the Marcellus/Utica, Permian Basin and Eagle Ford, and Bakken regions, as well as in Colombia. The company operates 16 AC rigs in the United States and 8 SCR rigs in Colombia. It also provides well, wireline, and coiled tubing services to various exploration and production companies in the onshore oil and gas producing regions in the Gulf Coast, Mid-Continent, and Rocky Mountain states. As of December 31, 2018, the company had a fleet of 113 rigs with 550 horsepower and 12 rigs with 600 horsepower; and 9 coiled tubing units. The company was formerly known as Pioneer Drilling Company and changed its name to Pioneer Energy Services Corp. in 2012. Pioneer Energy Services Corp. was founded in 1968 and is headquartered in San Antonio, Texas.