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Title: Pore-scale simulations of drainage of heterogeneous and anisotropic porous media

Abstract

A numerical model based on smoothed particle hydrodynamics (SPH) was used to simulate pore-scale liquid and gas flow in synthetic two-dimensional porous media consisting of non-overlapping grains. The model was used to study effects of pore scale heterogeneity and anisotropy on unsaturated flow and the saturation-pressure relationship. Pore scale anisotropy was created by using co-oriented non overlapping elliptical grains, and heterogeneity was created by inserting a micro-fracture in the middle of the porous domain consisting of non-overlapping circular grains. The effect of wetting fluid properties on drainage was also investigated. Capillary-pressure saturation curves resulting from fluid drainage through boundaries parallel and perpendicular the fracture alignment were qualitatively similar to those observed in gap-graded sediments with bimodal grain-size and pore-size distributions. Those derived from drainage on a boundary oriented perpendicular to particle and fracture alignment were qualitatively similar to those for mono-modal pore-size distributions. It is shown that pore-scale heterogeneity and anisotropy can gave rise to capillary pressure-saturation relationships and entry (bubbling) pressures that depend on flow direction suggesting that these properties should be described by tensor rather than scalar quantities.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
924058
Report Number(s):
PNNL-SA-52083
TRN: US200805%%36
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Physics of Fluids, 19(10):Art. No. 103301
Additional Journal Information:
Journal Volume: 19; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; POROUS MATERIALS; DRAINAGE; FLOW MODELS; PORE STRUCTURE; LIQUID FLOW; GAS FLOW; WETTABILITY; ANISOTROPY; HYDRODYNAMICS; SATURATION; smoothed particle hydrodynamics, multiphase flow, anisotropy, connectivity tensor, instability

Citation Formats

Tartakovsky, Alexandre M, Ward, Anderson L, and Meakin, Paul. Pore-scale simulations of drainage of heterogeneous and anisotropic porous media. United States: N. p., 2007. Web. doi:10.1063/1.2772529.
Tartakovsky, Alexandre M, Ward, Anderson L, & Meakin, Paul. Pore-scale simulations of drainage of heterogeneous and anisotropic porous media. United States. doi:10.1063/1.2772529.
Tartakovsky, Alexandre M, Ward, Anderson L, and Meakin, Paul. Mon . "Pore-scale simulations of drainage of heterogeneous and anisotropic porous media". United States. doi:10.1063/1.2772529.
@article{osti_924058,
title = {Pore-scale simulations of drainage of heterogeneous and anisotropic porous media},
author = {Tartakovsky, Alexandre M and Ward, Anderson L and Meakin, Paul},
abstractNote = {A numerical model based on smoothed particle hydrodynamics (SPH) was used to simulate pore-scale liquid and gas flow in synthetic two-dimensional porous media consisting of non-overlapping grains. The model was used to study effects of pore scale heterogeneity and anisotropy on unsaturated flow and the saturation-pressure relationship. Pore scale anisotropy was created by using co-oriented non overlapping elliptical grains, and heterogeneity was created by inserting a micro-fracture in the middle of the porous domain consisting of non-overlapping circular grains. The effect of wetting fluid properties on drainage was also investigated. Capillary-pressure saturation curves resulting from fluid drainage through boundaries parallel and perpendicular the fracture alignment were qualitatively similar to those observed in gap-graded sediments with bimodal grain-size and pore-size distributions. Those derived from drainage on a boundary oriented perpendicular to particle and fracture alignment were qualitatively similar to those for mono-modal pore-size distributions. It is shown that pore-scale heterogeneity and anisotropy can gave rise to capillary pressure-saturation relationships and entry (bubbling) pressures that depend on flow direction suggesting that these properties should be described by tensor rather than scalar quantities.},
doi = {10.1063/1.2772529},
journal = {Physics of Fluids, 19(10):Art. No. 103301},
number = 10,
volume = 19,
place = {United States},
year = {2007},
month = {10}
}