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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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Accurate phase-shift velocimetry in rock.

Matsyendra Nath Shukla1, Antoine Vallatos2, Vernon R Phoenix3

  • 1School of Geographical and Earth Sciences, University of Glasgow, United Kingdom; Glasgow Experimental MRI Centre, Institute of Neuroscience and Psychology, University of Glasgow, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 26, 2016
PubMed
Summary

Phase-shift velocimetry errors in porous media stem from molecular displacement asymmetries. A new method using Pulsed Field Gradient (PFG) velocimetry corrects these errors, enabling accurate flow analysis in rocks and low porosity materials.

Keywords:
BentheimerFlowMRIPFG NMRPorous mediaRockSandstoneVelocimetryVelocity

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Area of Science:

  • Physics
  • Geophysics
  • Fluid Dynamics

Background:

  • Spatially resolved Pulsed Field Gradient (PFG) velocimetry offers insights into fluid flow in opaque systems like rocks.
  • These techniques are crucial for enhancing flow models in reservoir engineering and hydrogeology.
  • Phase-shift velocimetry is a rapid method for generating velocity maps, but accuracy issues persist in porous media.

Purpose of the Study:

  • To identify the primary causes of inaccuracies in phase-shift velocimetry when applied to porous media.
  • To develop and validate a method for obtaining accurate phase-shift velocimetry maps in rocks and low porosity materials.

Main Methods:

  • Combined Pulsed Field Gradient (PFG) measurements with numerical simulations for flow through Bentheimer sandstone.
  • Analyzed molecular displacement distributions within each voxel to pinpoint sources of error.
  • Developed a novel method to minimize phase measurement noise and correct for displacement asymmetries.

Main Results:

  • Asymmetries in molecular displacement distributions within voxels were identified as the main source of phase-shift velocimetry errors.
  • Demonstrated that symmetric displacement distributions and minimized phase noise are achievable when flow-related displacements are small compared to self-diffusion.
  • Validated the developed method for accurate velocity mapping across various flow rates in porous media.

Conclusions:

  • Accurate phase-shift velocimetry in rocks and low porosity media is now feasible.
  • This advancement facilitates more rapid and precise velocity analysis for industrial applications and theoretical modeling.
  • Improved understanding of flow dynamics in subsurface environments is enabled by this technique.