Subsecond pore-scale displacement processes and relaxation dynamics in multiphase flow

Water Resources Research
Ryan T ArmstrongS Berg

Abstract

With recent advances at X-ray microcomputed tomography (μCT) synchrotron beam lines, it is now possible to study pore-scale flow in porous rock under dynamic flow conditions. The collection of four-dimensional data allows for the direct 3-D visualization of fluid-fluid displacement in porous rock as a function of time. However, even state-of-the-art fast-μCT scans require between one and a few seconds to complete and the much faster fluid movement occurring during that time interval is manifested as imaging artifacts in the reconstructed 3-D volume. We present an approach to analyze the 2-D radiograph data collected during fast-μCT to study the pore-scale displacement dynamics on the time scale of 40 ms which is near the intrinsic time scale of individual Haines jumps. We present a methodology to identify the time intervals at which pore-scale displacement events in the observed field of view occur and hence, how reconstruction intervals can be chosen to avoid fluid-movement-induced reconstruction artifacts. We further quantify the size, order, frequency, and location of fluid-fluid displacement at the millisecond time scale. We observe that after a displacement event, the pore-scale fluid distribution relaxes to (quasi-) equil...Continue Reading

References

Aug 14, 2009·Environmental Science & Technology·Riyadh I Al-Raoush
Nov 13, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Hu Dong, Martin J Blunt
Jul 12, 2011·Applied Optics·Glenn R MyersAdrian P Sheppard
Feb 23, 2013·Proceedings of the National Academy of Sciences of the United States of America·Steffen BergMarco Stampanoni
Nov 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ryan T Armstrong, Steffen Berg

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Citations

Jul 5, 2018·Journal of Microscopy·M N D'EurydiceR T Armstrong
Nov 15, 2016·Physical Review. E·Ryan T ArmstrongSteffen Berg
Jan 15, 2016·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·R HilferH Ott
May 19, 2019·Journal of Colloid and Interface Science·Martin J BluntBranko Bijeljic

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Methods Mentioned

BETA
X-ray

Software Mentioned

TOMCAT
Python
NumPy
Robuglas®
ImageJ
Octopus
Avizo Fire
Matplotlib

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