Presenters
John Thrash, Houston Pipe Line Co.
The Twofreds Delaware Sand Reservoir was discovered in 1957 and developed as a water-flood unit in 1963. By 1973, after a moderately successful waterflood, the production rate had declined to near economic limit. Carbon Dioxide injection for oil recovery was instigated in 1974, therefore, oil recovery since 1974 represents tertiary oil recovery after water-flooding. This paper discusses the actual application of CO2 injection procedures and the field performance for the 6-year period since CO2 injection was started. Performance to date appears successful in recovering additional oil from reservoirs of this type.