Comparison of Residual Saturation and Capillary Pressure Model for Granular Materials with UNSODA Data

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The capillary pressure model correlates drainage and imbibition data from the UNSODA database, provided that the data incorporate the entry head, a minimum displacement required for drainage to begin. According to the model, the imbibition pressure equals the drainage pressures at a critical minimum saturation of 0.301; below this critical saturation, no additional reversible drainage should occur. Some of the UNSODA data sets had a minimum saturation approximately half this value. The difference is attributed to the presence of fissures, which would lower the residual wetting and critical minimum saturations by reducing the fraction of the void volume controlled by ... continued below

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LAURINAT, JAMESE. November 1, 2004.

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The capillary pressure model correlates drainage and imbibition data from the UNSODA database, provided that the data incorporate the entry head, a minimum displacement required for drainage to begin. According to the model, the imbibition pressure equals the drainage pressures at a critical minimum saturation of 0.301; below this critical saturation, no additional reversible drainage should occur. Some of the UNSODA data sets had a minimum saturation approximately half this value. The difference is attributed to the presence of fissures, which would lower the residual wetting and critical minimum saturations by reducing the fraction of the void volume controlled by capillary pores. If the UNSODA saturations are adjusted for this discrepancy, a probability distribution of minimum saturations for each data set peaks near the predicted critical minimum saturation. Maximum saturations for each data set have a peak near the predicted residual nonwetting saturation of 0.884.

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  • Journal Name: Transport in Porous Media

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  • Report No.: WSRC-MS-2004-00172, Rev. 1
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 835063
  • Archival Resource Key: ark:/67531/metadc779780

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  • November 1, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 5:38 p.m.

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LAURINAT, JAMESE. Comparison of Residual Saturation and Capillary Pressure Model for Granular Materials with UNSODA Data, article, November 1, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc779780/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.