The Weyburn and Midale oil fields were discovered in 1954 near Midale, Saskatchewan.
The Weyburn Oilfield covers an area of some  and has a current oil production rate of ~3,067 m3/day. Original oil-in-place is estimated to be . The oil is produced from a total of 963 active wells made up of 534 vertical wells, 138 horizontal wells, and 171 injection systems. There are also 146 enclosed wells. Current production consists primarily of medium-gravity crude oil with a low gas-to-oil ratio.
The Midale oil field is about  in size, and has  of oil-in-place. It began injecting CO in 2005.
Various enhanced oil recovery techniques were used in the Weyburn field prior to the introduction of CO, between the 1970s and 1990s.  These include additional vertical drilling, the introduction of horizontal drilling, and the use of waterfloods to increase pressure in the reservoir. In October 2000, Cenovus (formerly Pan Canadian, Encana) began injecting significant amounts of carbon dioxide into the Weyburn field in order to boost oil production. Cenovus was the operator and held the largest share of the 37 current partners in the oilfield prior to the sale of local assets to Whitecap in 2017.