The South Welch Unit of the Welch Field commenced full scale injection of CO2 beginning in September of 1993. The flood design was based on the performance of a 180 acre pilot conducted from 1982 to 1987. A compositional model study of the pilot performance was used to design a CO2processing facility and the full scale flood operating approach. Primary, secondary and tertiary performance matching were used to verify the reservoir and process description and to forecast performance under a full field scenario. Scaleup was based on floodable pay from the modeled area related to the remaining areas under consideration for flood.

Reservoir simulation and economic analysis were used to investigate water alternating gas (WAG) cycle lengths, WAG ratio, and total slug sizes. Phasing of areas was coupled to level plant loading considerations, water handling limits, and short term profitability to develop an operating plan for the Unit.

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