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 and Production Services. Drilling Services provides contract land drilling services to a group of oil and gas exploration and production companies with its fleet of 62 drilling rigs. Its Production Services provides a range of services to exploration and production companies, including well servicing, wireline services, coiled tubing services, and fishing and rental services. Its production services operations are concentrated in the United States onshore oil and gas producing regions in the Mid-Continent and Rocky Mountain states and in the Gulf Coast, both onshore and offshore.