The definitive work on fracture relative permeability was performed by E.S. Romm in 1966. His research concluded that relative permeability is a linear function of saturation. Since that time very few attempts have been made to calculate relative permeability in fractures. This paper presents the results of an independent experimental investigation to test the validity of Romm's results. The research was conducted with the same kerosene and water systems in a parallel glass plate fracture applying modern day techniques.

The technique of videoimaging was used for measuring saturations in the fracture. Relative permeability ratios were computed using Welge's interpretation of the Buckley-Levrett theory after fractional flow was obtained from the displacement.

Results indicated that relative permeability is not a linear function of saturation as was shown in the past.

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