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Related Experiment Video

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Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
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Subsecond pore-scale displacement processes and relaxation dynamics in multiphase flow.

Ryan T Armstrong1, Holger Ott2, Apostolos Georgiadis2

  • 1School of Petroleum Engineering, University of New South Wales New South Wales, Sydney, Australia.

Water Resources Research
|March 7, 2015
PubMed
Summary
This summary is machine-generated.

Researchers analyzed 2D radiograph data from fast X-ray microcomputed tomography (μCT) to observe pore-scale fluid displacement dynamics at millisecond timescales. This method overcomes imaging artifacts caused by rapid fluid movement in porous rock.

Keywords:
Haines jumpX-ray microcomputed tomographyfractional flowmultiphase flow, computed microtomographypore scale

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Area of Science:

  • Geosciences
  • Physics
  • Chemical Engineering

Background:

  • Recent advances in X-ray microcomputed tomography (μCT) enable dynamic, four-dimensional studies of pore-scale flow in porous media.
  • Fast fluid movement during μCT scans creates imaging artifacts, obscuring pore-scale displacement dynamics.
  • Understanding these dynamics is crucial for characterizing multiphase flow in porous rocks.

Purpose of the Study:

  • To develop a method for analyzing 2D radiograph data from fast-μCT to resolve pore-scale fluid displacement at millisecond timescales.
  • To identify and avoid fluid-movement-induced reconstruction artifacts in μCT data.
  • To quantify the characteristics of fluid-fluid displacement events and their relaxation dynamics.

Main Methods:

  • Analysis of 2D radiograph data acquired during fast X-ray microcomputed tomography (μCT) scans.
  • Identification of time intervals corresponding to pore-scale displacement events (e.g., Haines jumps).
  • Quantification of displacement event size, order, frequency, location, and subsequent fluid relaxation dynamics.

Main Results:

  • Pore-scale fluid displacement events were observed and quantified at the millisecond timescale (40 ms).
  • A methodology was established to select μCT reconstruction intervals that avoid movement artifacts.
  • Post-displacement relaxation to quasi-equilibrium occurs via cascades of pore-scale rearrangements with relaxation times of 0.5–2.0 s.

Conclusions:

  • The developed approach allows for the study of pore-scale fluid dynamics at near-intrinsic time scales, overcoming limitations of standard μCT.
  • Findings provide insights into flow regimes and relevant time/length scales for fractional flow in porous media.
  • The methodology is broadly applicable to various μCT applications involving rapid morphological changes.