Midale EOR

The Midale CO₂-EOR project is located in southeastern Saskatchewan, Canada, within the Williston Basin, and forms part of one of the world’s largest integrated CO₂ utilization and storage developments alongside the Weyburn field. Production targets Mississippian-age Midale and Frobisher carbonate formations, consisting of shallow-marine limestone and dolomite reservoirs characterized by strong structural and stratigraphic trapping. The field underwent primary production and extensive waterflooding prior to conversion to tertiary recovery using miscible CO₂ flooding to improve recovery efficiency from mature carbonate reservoirs. CO₂ is supplied via pipeline infrastructure, historically sourced from anthropogenic capture streams and regional CO₂ networks, and injected through pattern flood configurations incorporating water-alternating-gas (WAG) cycles to optimize sweep efficiency and control mobility in heterogeneous carbonate intervals. Produced CO₂ is separated at surface facilities, recompressed, and recycled for reinjection, while retained volumes contribute to long-term geologic storage through structural trapping, residual trapping, and dissolution within formation fluids.