Volume 4, Issue 2
Modeling of Low Salinity Effects in Sandstone Oil Rocks.

ARUOTURE VOKE OMEKEH, STEINAR EVJE, AND HELMER ANDR ́E FRIIS

Int. J. Numer. Anal. Mod. B,4 (2013), pp. 95-128

Published online: 2013-04

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  • Abstract
Low salinity water has been reported as being capable of improving oil recovery in sandstone cores under certain conditions. The objective of this paper is the development and examination of a one-dimensional mathematical model for the study of water flooding lab experiments with special focus on the effect of low salinity type of brines for sandstone cores. The main mechanism that is built into the model is a multiple ion exchange (MIE) process, which due to the presence of clay, will have an impact on the water-oil flow functions (relative permeability curves). The chemical water-rock system (MIE process) we consider takes into account desorption and adsorption of calcium, magnesium, and sodium. More precisely, the model is formulated such that the total release of divalent cations (calcium and magnesium) from the rock surface will give rise to a change of the relative permeability functions such that more oil is mobilized. The release of cations depend on several factors like (i) connate water composition; (ii) brine composition for the flooding water; (iii) clay content/capacity. Consequently, the model demonstrates that the oil recovery also, in a nontrivial manner, is sensitive to these factors. An appropriate numerical discretization is employed to solve the resulting system of conservation laws and characteristic features of the model is explored in order to gain more insight into the role played by low salinity flooding waters, and its possible impact on oil recovery.
  • AMS Subject Headings

35R35 49J40 60G40

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@Article{IJNAMB-4-95, author = {ARUOTURE VOKE OMEKEH, STEINAR EVJE, AND HELMER ANDR ́E FRIIS}, title = {Modeling of Low Salinity Effects in Sandstone Oil Rocks.}, journal = {International Journal of Numerical Analysis Modeling Series B}, year = {2013}, volume = {4}, number = {2}, pages = {95--128}, abstract = {Low salinity water has been reported as being capable of improving oil recovery in sandstone cores under certain conditions. The objective of this paper is the development and examination of a one-dimensional mathematical model for the study of water flooding lab experiments with special focus on the effect of low salinity type of brines for sandstone cores. The main mechanism that is built into the model is a multiple ion exchange (MIE) process, which due to the presence of clay, will have an impact on the water-oil flow functions (relative permeability curves). The chemical water-rock system (MIE process) we consider takes into account desorption and adsorption of calcium, magnesium, and sodium. More precisely, the model is formulated such that the total release of divalent cations (calcium and magnesium) from the rock surface will give rise to a change of the relative permeability functions such that more oil is mobilized. The release of cations depend on several factors like (i) connate water composition; (ii) brine composition for the flooding water; (iii) clay content/capacity. Consequently, the model demonstrates that the oil recovery also, in a nontrivial manner, is sensitive to these factors. An appropriate numerical discretization is employed to solve the resulting system of conservation laws and characteristic features of the model is explored in order to gain more insight into the role played by low salinity flooding waters, and its possible impact on oil recovery.}, issn = {}, doi = {https://doi.org/}, url = {http://global-sci.org/intro/article_detail/ijnamb/248.html} }
TY - JOUR T1 - Modeling of Low Salinity Effects in Sandstone Oil Rocks. AU - ARUOTURE VOKE OMEKEH, STEINAR EVJE, AND HELMER ANDR ́E FRIIS JO - International Journal of Numerical Analysis Modeling Series B VL - 2 SP - 95 EP - 128 PY - 2013 DA - 2013/04 SN - 4 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/ijnamb/248.html KW - low salinity KW - multiple ion exchange KW - porous media KW - two-phase flow KW - convection-diffusion equations and wettability alteration AB - Low salinity water has been reported as being capable of improving oil recovery in sandstone cores under certain conditions. The objective of this paper is the development and examination of a one-dimensional mathematical model for the study of water flooding lab experiments with special focus on the effect of low salinity type of brines for sandstone cores. The main mechanism that is built into the model is a multiple ion exchange (MIE) process, which due to the presence of clay, will have an impact on the water-oil flow functions (relative permeability curves). The chemical water-rock system (MIE process) we consider takes into account desorption and adsorption of calcium, magnesium, and sodium. More precisely, the model is formulated such that the total release of divalent cations (calcium and magnesium) from the rock surface will give rise to a change of the relative permeability functions such that more oil is mobilized. The release of cations depend on several factors like (i) connate water composition; (ii) brine composition for the flooding water; (iii) clay content/capacity. Consequently, the model demonstrates that the oil recovery also, in a nontrivial manner, is sensitive to these factors. An appropriate numerical discretization is employed to solve the resulting system of conservation laws and characteristic features of the model is explored in order to gain more insight into the role played by low salinity flooding waters, and its possible impact on oil recovery.
ARUOTURE VOKE OMEKEH, STEINAR EVJE, AND HELMER ANDR ́E FRIIS. (2013). Modeling of Low Salinity Effects in Sandstone Oil Rocks.. International Journal of Numerical Analysis Modeling Series B. 4 (2). 95-128. doi:
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