Abstract
Abstract The saturation distribution of steam, water, and oil within the steam zone in a steam-injection process at constant injection rates is examined. It is shown theoretically that for typical values of injection parameters the oil saturation in the steam zone rapidly reaches its residual value at steam zone conditions. This result, which corroborates previous experimental evidence, is a consequence of the relatively fast changes in phase saturations compared with the rate of the advance of the steam front. Explicit expressions for the steam saturation distribution are obtained. It is shown that the average steam saturation is a slightly decreasing function of time and approaches a limiting value that is a nearly constant fraction of the steam saturation at the injection point. This result provides theoretical justification for the assumption of constant average steam saturation in steam-injection calculations.
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