This paper presents a critical review of recent experimental and theoretical developments in the area of three-phase relative permeability along with a comparative evaluation of several models for estimating the oil relative permeability under three-phase flow conditions.

Reported experimental data on three-phase relative permeability were screened for reliability and completeness and three representative data sets were selected for use in evaluation of the prediction techniques. Eight different prediction models were selected for evaluation. Each model was tested with the three selected data sets for its ability to match the experimentally determined oil relative permeability under three-phase flow conditions.

It was found that none of the models predicted all of the tested data sets with high accuracy. However, there are models that give significantly more reliable predictions of three-phase oil relative permeability compared to the other models.

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