Measuring Oil and Water Relative Permeability in a Single Fracture and Researching Its Impacting Factors

Abstract

For the research of oil and water relative permeability in single fracture it is important to study the law of flow in fractured-vuggy reservoirs. Base on the wetting property of the field, single-fracture acrylic models with different fracture apertures are created. Using these models, oil and water relative permeability with different water-oil viscosity ratio, different fracture aperture, different fracture dip, and different displacing velocity are measured by the steady-state method. How the relative permeability is influenced by these factors is further studied. The results show that: when the water-oil viscosity ratio is close to 1, the shape of relative permeability curve is similar to X. Relative permeability of oil and water decreases with increasing water-oil viscosity ratio and decreasing fracture aperture and increasing displacing velocity. Fracture dip has little effect on the shape of the relative permeability curve. Residual oil saturation decreases with decreasing water-oil viscosity ratio, increasing fracture aperture, increasing fracture dip, and increasing displacing velocity.