Calfrac Well Services Ltd. engages in the provision of specialized oilfield services. It operates through the following segments: the United States, Canada, Argentina, and Corporate. The United States segment offers fracturing services to oil companies operating in the Bakken oil shale play in North Dakota; in the Rockies area; and in Texas and New Mexico, where it services the Eagle Ford and Permian basins. The Canada segment focuses on the provision of fracturing and coiled tubing services to a diverse group of oil and natural gas exploration and production companies operating in Alberta, northeast British Columbia, Saskatchewan, and Manitoba. The Argentina segment consists of pressure pumping services from its operating bases in Argentina. The company was founded by Ronald P. Mathison and Douglas R. Ramsay on June 28, 1999 and is headquartered in Calgary, Canada.