Brigham Exploration Oil & Gas, 14649 Brigham Dr, Williston, ND 58801, US

Key Energy Services is one of the largest providers of land-based well service rigs in the United States and one of the leading, onshore, rig-based well servicing contractors in the world. The company provides rig-based well maintenance, work over, well completion and recompletion, fluid management, pressure pumping, ancillary oilfield, and fishing and rental services. It has operations in all major onshore oil and gas producing regions of the continental U.S. and internationally in Argentina and Mexico. Additionally, Key Energy Services has a technology development group based in Canada, as well as interests in a drilling and production services company in Canada and a drilling and work over services and sub-surface engineering and modeling company in the Russian Federation.