Effect of Initial Saturation on Two-Phase Flow in Smooth and Rough Walled Single Fracture


Effect of Initial Saturation on Two-Phase Flow in Smooth and Rough Walled Single Fracture

CETI 14-047

Authors: A.A. Alturki, B.B. Maini, I.D. Gates, University of Calgary

Volume 2, Number 2

This work experimentally examines the effects of initial saturations in a single fracture on two-phase relative permeability to oil and water. A set of experiments for different fracture configurations were designed to investigate the concurrent flow of oil and water in neutral-wet, water-saturated, smooth and rough walled single fractures. Two smooth walled fractures with different nominal apertures (0.0254 and 0.0381 cm) were used. In the rough walled fracture, a 0.125 cm thick spacer was used with measured porosity of 65.4%. The essence of the work is to examine the effects of initial saturation of the fracture on the phase distribution and flow regimes development, and the combined effects of fracture aperture variations, flow rate ratios, fracture wall roughness, and inclination angle on relative permeability to oil and water. Experimental relative permeability data exhibited variations in shape and extent over a wide range of saturation profiles reflecting the effects of the aforementioned factors. Roughness increases oil-water phase interference and hysteresis of the flow when scanning up and down (increasing and decreasing) in water saturation with increasing and decreasing flow rate ratios The saturation exponent and homogenous single-phase models fitted the relative permeability data to a good extent, whereas the fits of other models, like X-Curve, Corey and Brooks-Corey, were not satisfactory.

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© 2012 Canadian Energy Technology & Innovation (CETI) Group
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Canadian Energy Technology & Innovation (CETI) Group

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