The effects of the unswept zone mobility (kh/µ) on steam inject1v1ty were Investigated. Six falloff tests were run in a steamflood near Maricopa, California. The tests were analyzed using the radial composite model with the aid of the Barua-Horne and the Kappa Saphir well test analysis software packages.

Computer aided matching of the radial composite model with steam injection well falloff data provided remarkable agreement between field data and model simulation. It was possible to find skin, well bore storage, steam zone mobility and compressibility, and the mobility and compressibility of the zone ahead of the steam front. Low mobility ahead of the steam zone was found to limit steam injectivity in several field cases.

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