Evaluation and Design of a CO2 Miscible Flood Project-SACROC Unit, Kelly-Snyder Field

The SACROC Unit, encompassing about 98% of the reservoir, was formed in 1953 and initiated in Sept. 1954 a massive pressure maintenance program consisting of water injection into a centerline row of wells located along the longitudinal axis of the reservoir. This program, together with controlled production under unitized operations, has effectively rebuilt BHP, restored a large portion of the reservoir to liquid-saturated conditions, and stabilized producing GOR's at near solution levels. In 1968, a technical committee, investigating potential alternatives, recommended use of a water-driven slug of carbon dioxide to miscibly displace the oil in the nonwater- invaded portion of the reservoir and development of a pattern injection program in this area to implement the slug process and improve ultimate oil recovery. A summary is presented of the methods used in evaluating alternatives and designing the final program of COD2U injection, which was initiated in early 1972.