Pore-throat size correlation from capillary pressure curves |
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Authors: | N C Wardlaw Y Li D Forbes |
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Institution: | (1) Department of Geology and Geophysics, University of Calgary, T2N 1N4 Calgary, Alberta, Canada;(2) Nanhi West Oil Corporation, P.O. Box 11, Potou, Zhanjiang, Guangdong, People's Republic of China;(3) Department of Geology and Geophysics, University of Calgary, T2N 1N4 Calgary, Alberta, Canada |
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Abstract: | Void spaces in porous media can be considered as three-dimensional networks consisting of bulges (pores) connected by constrictions (throats). Computer simulations of drainage-imbibition processes show that the critical end points of wetting-phase and nonwetting-phase saturation, in drainage and imbibition respectively, and the form of simulated relative permeability curves all were significantly different for uncorrelated and correlated pore-throat models. Since these models were identical except for the arrangement of throats in relation to pores, the degree of pore-throat size correlation appears to be an important property influencing flow and fluid displacement. Examples of uncorrelated and correlated pore-throat structures in rocks are presented and it is shown that this property, although difficult to quantify by direct observation, can be evaluated from capillary pressure curves. |
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Keywords: | Drainage imbibition capillary pressure pore throat relative permeability |
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