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  4. Experimental study on nonmonotonicity of Capillary Desaturation Curves in a 2-D pore network
 
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Experimental study on nonmonotonicity of Capillary Desaturation Curves in a 2-D pore network

Publikationstyp
Journal Article
Date Issued
2015-10
Sprache
English
Author(s)
Rodríguez de Castro, Antonio  
Shokri, Nima  
Karadimitriou, Nikolaos K.  
Oostrom, Mart  
Joekar-Niasar, Vahid  
TORE-URI
http://hdl.handle.net/11420/10674
Journal
Water resources research  
Volume
51
Issue
10
Start Page
8517
End Page
8528
Citation
Water Resources Research 51 (10): 8517-8528 (2015-10)
Publisher DOI
10.1002/2015WR017727
Scopus ID
2-s2.0-84956571938
Immiscible displacement in porous media is important in many applications such as soil remediation and enhanced oil recovery. When gravitational forces are negligible, two-phase immiscible displacement at the pore level is controlled by capillary and viscous forces whose relative importance is quantified through the dimensionless capillary number Ca and the viscosity ratio M between liquid phases. Depending on the values of Ca and M, capillary fingering, viscous fingering, or stable displacement may be observed resulting in a variety of patterns affecting the phase entrapment. The Capillary Desaturation Curve (CDC), which represents the relationship between the residual oil saturation and Ca, is an important relation to describe the phase entrapment at a given Ca. In the present study, we investigated the CDC as influenced by the viscosity ratio. To do so, we have conducted a comprehensive series of experiments using a high-resolution microscope and state-of-art micromodels to investigate the dynamics and patterns of phase entrapment at different Ca and M. By postprocessing of the experimental high-resolution images, we calculated the CDC and quantified the effects of the Ca and M on the phase entrapment and number of blobs trapped in the micromodel and their size distributions during immiscible two-phase flow. Our results show that CDCs are not necessarily monotonic for all M, and the physical mechanisms causing this nonmonotonic behavior are discussed.
Subjects
Capillary Desaturation Curve
capillary number
micromodel
phase entrapment
viscosity ratio
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