Numerical Model For Napl Migration In Double-Porosity Subsurface Systems

The double-porosity concept has been successfully applied by many researchers to simulate fluid flow in oil reservoirs over the past few decades. These oil reservoirs were typically considered to be made of fractured or fissured rock, hence the usance of the double-porosity concept. Nonetheless, do...

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Main Authors:	Ngien, S. K., Tan, Lit Ken
Format:	Conference or Workshop Item
Language:	English
Published:	2015
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/9426/ http://umpir.ump.edu.my/id/eprint/9426/ http://umpir.ump.edu.my/id/eprint/9426/1/Numerical%20Model%20For%20Napl%20Migration%20In%20Double-Porosity%20Subsurface%20Systems.pdf

id	ump-9426
recordtype	eprints
spelling	ump-94262018-02-06T07:37:23Z http://umpir.ump.edu.my/id/eprint/9426/ Numerical Model For Napl Migration In Double-Porosity Subsurface Systems Ngien, S. K. Tan, Lit Ken TA Engineering (General). Civil engineering (General) The double-porosity concept has been successfully applied by many researchers to simulate fluid flow in oil reservoirs over the past few decades. These oil reservoirs were typically considered to be made of fractured or fissured rock, hence the usance of the double-porosity concept. Nonetheless, double-porosity may also exist in soil either through soil aggregation, or through soil features such as wormholes, cracks and root holes. These attributes in soil that cause the occurrence of double-porosity are also known as secondary porosity features and are akin to the reservoir rock fractures or fissures. In the case of groundwater contamination, the occurrence of double-porosity in soil is highly influential since immiscible fluids have been found to flow preferentially through the secondary porosity features. Ergo, a numerical model for non-aqueous phase liquids (NAPL) migration in double-porosity groundwater systems was developed. This model was modified from the conventional double-porosity model applied in the petroleum industry. The difference is that while the standard double-porosity models usually simulate the fluid flows in both continua making up the doubleporosity medium, the double-porosity model presented here focuses the modelling on the secondary porosity features in the soil, therefore making it more pertinent in the context of groundwater contamination. In the modified model, the phase saturations and relative permeabilities are expressed as functions of the capillary pressures. The resultant nonlinear governing partial differential equations are solved using numerical methods. The problem is discretized spatially using the Galerkin’s weighted-residual finite element method whereas a fully implicit scheme is used for temporal discretization. Verification of the developed model has been done against similar works in the open literature and the preferential flow of NAPL through the secondary porosity features was validated. 2015 Conference or Workshop Item PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/9426/1/Numerical%20Model%20For%20Napl%20Migration%20In%20Double-Porosity%20Subsurface%20Systems.pdf Ngien, S. K. and Tan, Lit Ken (2015) Numerical Model For Napl Migration In Double-Porosity Subsurface Systems. In: E-proceedings of the 36th IAHR World Congress, 28 June – 3 July 2015 , Netherlands . pp. 1-5.. http://89.31.100.18/~iahrpapers/80229.pdf
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Ngien, S. K. Tan, Lit Ken Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
description	The double-porosity concept has been successfully applied by many researchers to simulate fluid flow in oil reservoirs over the past few decades. These oil reservoirs were typically considered to be made of fractured or fissured rock, hence the usance of the double-porosity concept. Nonetheless, double-porosity may also exist in soil either through soil aggregation, or through soil features such as wormholes, cracks and root holes. These attributes in soil that cause the occurrence of double-porosity are also known as secondary porosity features and are akin to the reservoir rock fractures or fissures. In the case of groundwater contamination, the occurrence of double-porosity in soil is highly influential since immiscible fluids have been found to flow preferentially through the secondary porosity features. Ergo, a numerical model for non-aqueous phase liquids (NAPL) migration in double-porosity groundwater systems was developed. This model was modified from the conventional double-porosity model applied in the petroleum industry. The difference is that while the standard double-porosity models usually simulate the fluid flows in both continua making up the doubleporosity medium, the double-porosity model presented here focuses the modelling on the secondary porosity features in the soil, therefore making it more pertinent in the context of groundwater contamination. In the modified model, the phase saturations and relative permeabilities are expressed as functions of the capillary pressures. The resultant nonlinear governing partial differential equations are solved using numerical methods. The problem is discretized spatially using the Galerkin’s weighted-residual finite element method whereas a fully implicit scheme is used for temporal discretization. Verification of the developed model has been done against similar works in the open literature and the preferential flow of NAPL through the secondary porosity features was validated.
format	Conference or Workshop Item
author	Ngien, S. K. Tan, Lit Ken
author_facet	Ngien, S. K. Tan, Lit Ken
author_sort	Ngien, S. K.
title	Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
title_short	Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
title_full	Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
title_fullStr	Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
title_full_unstemmed	Numerical Model For Napl Migration In Double-Porosity Subsurface Systems
title_sort	numerical model for napl migration in double-porosity subsurface systems
publishDate	2015
url	http://umpir.ump.edu.my/id/eprint/9426/ http://umpir.ump.edu.my/id/eprint/9426/ http://umpir.ump.edu.my/id/eprint/9426/1/Numerical%20Model%20For%20Napl%20Migration%20In%20Double-Porosity%20Subsurface%20Systems.pdf
first_indexed	2023-09-18T22:07:59Z
last_indexed	2023-09-18T22:07:59Z
_version_	1777414837146484736

Numerical Model For Napl Migration In Double-Porosity Subsurface Systems

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