Amoco Canada has been operating a pressure cycling fireflood at Morgan, in the Lloydminster area of Alberta, Canada, since the mid 1980's. A pressure cycle consists of air injection into a central injector accompanied by production from its surrounding producers. The reservoir contains a 12 API heavy crude and the wells are laid out in 30-acre (12 ha), 7-spot patterns. The rapid drop in the crude oil prices in 1986 led to the successful development and implementation of an innovative pressure cycling-combustion process. This paper looks at the performance of the project and the numerical modelling done to history match the results. The numerical modelling effort was undertaken to explain the high oil rates (individual wells at 120+ STB/D- 19m3/D) and the extraordinarily low injected air-to--produced oil ratio (AOR) of less than 2 MSCF/STB (355 m3/m3). Mechanisms incorporated in the numerical model include: (1) A high speed channel from the injector to the producer, (2) Combustion gas entrainment by the oil phase and (3) Oil upgrading. The physics involved with these mechanisms are explained and the model results are compared with the actual field data. Also, model sensitivities to variations in the assumptions regarding the mechanisms are discussed.

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