Ensign Energy Services Inc. (Ensign) is engaged in the provision of oilfield services to the crude oil and natural gas industries in Canada, the United States and internationally. Oilfield services provided by Ensign include drilling and well servicing, oil sands coring, directional services, underbalanced drilling, equipment rentals, transportation, wireline services, production testing / frac flowback services and custom manufacturing. As at December 31, 2011, Ensign owned and operated a fleet totaling 344 land drilling and specialty rigs worldwide, which included 168 in Canada, 117 in the United States and 59 internationally. Ensign also owned and operated 139 well servicing rigs (103 in Canada and 36 in the United States) and the various oilfield services support equipment. On September 1, 2011, it purchased the land drilling business of Rowan Companies, Inc. through a subsidiary, Ensign United States Drilling (S.W.) Inc.