Remobilization of Residual Non-Aqueous Phase Liquid in Porous Media by Freeze−Thaw Cycles

Singh, Kamaljit; Niven, Robert K.; Senden, Tim J.; Turner, Michael L.; Sheppard, Adrian; Middleton, Jill; Knackstedt, Mark

doi:10.1021/es200151g

Cited by 37 publications

(19 citation statements)

References 32 publications

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“…In three-dimensions, the dynamics have not been investigated in such detail; studies using X-ray micro-tomography, e.g., refs 12–16, report end states, i.e., after drainage and imbibition, which provide detailed information about ganglia or disconnected non-wetting phase clusters, but do not describe the dynamics of trapping. This time-dependent information is important to validate models of pore-scale displacement 17, 18 and to quantify how the balance of viscous and capillary forces controls the exact nature of trapping.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of snap-off and pore-filling events during two-phase fluid flow in permeable media

Singh

Menke

Andrew

et al. 2017

Sci Rep

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181

153

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Understanding the pore-scale dynamics of two-phase fluid flow in permeable media is important in many processes such as water infiltration in soils, oil recovery, and geo-sequestration of CO2. The two most important processes that compete during the displacement of a non-wetting fluid by a wetting fluid are pore-filling or piston-like displacement and snap-off; this latter process can lead to trapping of the non-wetting phase. We present a three-dimensional dynamic visualization study using fast synchrotron X-ray micro-tomography to provide new insights into these processes by conducting a time-resolved pore-by-pore analysis of the local curvature and capillary pressure. We show that the time-scales of interface movement and brine layer swelling leading to snap-off are several minutes, orders of magnitude slower than observed for Haines jumps in drainage. The local capillary pressure increases rapidly after snap-off as the trapped phase finds a position that is a new local energy minimum. However, the pressure change is less dramatic than that observed during drainage. We also show that the brine-oil interface jumps from pore-to-pore during imbibition at an approximately constant local capillary pressure, with an event size of the order of an average pore size, again much smaller than the large bursts seen during drainage.

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Section: Introductionmentioning

confidence: 99%

Dynamics of snap-off and pore-filling events during two-phase fluid flow in permeable media

Singh

Menke

Andrew

et al. 2017

Sci Rep

Self Cite

181

153

View full text Add to dashboard Cite

show abstract

“…At the pore scale, micro-CT technology has the capability to image the location of the residual phases inside the pore space, thus providing detailed information on the size and shape of the residual ganglia [17][18][19][20][21][22][23][24][25][26][27][28]. Another important application of the micro-CT imaging is the measurement of contact angle at reservoir conditions (elevated temperature and pressure) [29], which is one of the main input parameters for pore-scale numerical modelling.…”

Section: Introductionmentioning

confidence: 99%

Modelling capillary trapping using finite-volume simulation of two-phase flow directly on micro-CT images

Raeini

Bijeljic

Blunt

2015

Advances in Water Resources

107

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“…Dann et al (2011) derive the physical and hydraulic properties of a coastal sand aquifer using micro and macro X-ray computed tomography techniques. Singh et al (2011) examined the pore-scale behavior of a non-aqueous phase liquid (NAPL) trapped as residual contamination in a porous medium, subject to freeze-thaw cycles, by X-ray micro-CT (Figure 8). By means of X-ray CT it was possible the render in 3D an X-ray tomogram of residual non-aqueous phase liquid (yellow) and water (blue) in bead pack (transparent).…”

Section:  Fluid Flow Analysismentioning

confidence: 99%

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Cnudde

Boone

2013

Earth-Science Reviews

1,266

700

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Please cite this article as: Cnudde, V., Boone, M.N., "High-resolution X-ray computed tomography in geosciences: a review of the current technology and applications", Earth Science Reviews (2013Reviews ( ), doi: 10.1016Reviews ( /j.earscirev.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T AbstractHigh-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming better appreciated in earth science research, the demands on this technique are also approaching certain physical limitations. As such, there remains a lot of research to be done in order to solve all the technical problems that occur when higher demands are put on the technique. In this paper, a review of the principle, the advantages and limitations of X-ray CT itself are presented, together with an overview of some current applications of micro-CT in geosciences. One of the main advantages of this technique is the fact that it is a non-destructive characterization technique which allows 4D monitoring of internal structural changes at resolutions down to a few hundred nanometers. Limitations of this technique are the operator dependency for the 3D image analysis from the reconstructed data, the discretations effects and possible imaging artefacts. Driven by the technological and computational progress, the technique is continuously growing as an analysis tool in geosciences and is becoming one of the standard techniques, as is shown by the large and still increasing number of publications in this research area. It is foreseen that this number will continue to rise, and micro-CT will become an indispensable technique in the field of geosciences.

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Remobilization of Residual Non-Aqueous Phase Liquid in Porous Media by Freeze−Thaw Cycles

Cited by 37 publications

References 32 publications

Dynamics of snap-off and pore-filling events during two-phase fluid flow in permeable media

Dynamics of snap-off and pore-filling events during two-phase fluid flow in permeable media

Modelling capillary trapping using finite-volume simulation of two-phase flow directly on micro-CT images

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

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