Pioneer Energy Services Corp., formerly Pioneer Drilling Company, provides drilling and production services to independent oil and gas exploration and production companies throughout much of the onshore oil and gas producing regions of the United States and internationally in Colombia. The Company operates in two segments: Drilling Services Division and Production Services Division. The Company�s Drilling Services Division provides contract land drilling services. The Company�s Production Services Division provides a range of services to oil and gas exploration and production companies. On December 31, 2011, the Company acquired Go-Coil, LLC.