This is a comprehensive evaluation of the background, operations and results of applying the emerging steam-foam technology to two patterns of a mature steamflood suffering excessive steam breakthrough.

Care was taken: (a) to establish a valid baseline for injection and production before the treatments, (b) to hold injection in the surrounding patterns at or below pretreatment levels, in order to isolate the causes of any oil rate increase, and (c) to monitor in detail the two pilots over an extended period of time.

Aspects of the project discussed include its design and implementation, the inferred reservoir mechanisms, the associated production operations and field performance, as well as the economics of the project.

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