Energy is the key to growth for Key Energy Services, one of the US's largest well-servicing and workover companies. The company provides maintenance, workover, and recompletion of wells, primarily for onshore drilling. It provides services such as contract drilling, well completion, oilfield fluid transportation, production testing, and storage and disposal services to major and independent oil companies. Key Energy Services has a fleet of 884 well service rigs in the US. It also has operations in Mexico and has a technology development and control systems business based in Canada. The company filed for Chapter 11 bankruptcy protection in 2016.