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Time-of-flight flow imaging using NMR remote detection.

J Granwehr1, E Harel, S Han

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California at Berkeley, 94720-1460, USA. joga@waugh.cchem.berkeley.edu

Physical Review Letters
|October 4, 2005
PubMed
Summary

A novel time-of-flight imaging technique visualizes fluid flow and dispersion in porous media using Nuclear Magnetic Resonance (NMR). This method enhances sensitivity for detailed flow dynamics analysis.

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Area of Science:

  • Geophysics
  • Chemical Engineering
  • Physics

Background:

  • Understanding fluid dynamics in porous materials is crucial for various scientific and industrial applications.
  • Existing imaging techniques may lack the sensitivity or temporal resolution for detailed flow analysis.

Purpose of the Study:

  • To introduce and demonstrate a new time-of-flight imaging technique for visualizing fluid flow and dispersion.
  • To enhance the sensitivity and temporal resolution of Nuclear Magnetic Resonance (NMR) imaging for porous media studies.

Main Methods:

  • Utilized a time-of-flight imaging approach with Nuclear Magnetic Resonance (NMR).
  • Employed radiofrequency (rf) pulses and magnetic field gradients to encode fluid spatial coordinates.
  • Recorded modulated nuclear spin magnetization after fluid passage through the sample using a second rf coil.

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Main Results:

  • Successfully visualized time-dependent fluid flow and dispersion through a porous medium.
  • Demonstrated the technique's capability by imaging gas flow through porous rock.
  • Showcased enhanced sensitivity through separate optimization of encoding and detection subsystems.

Conclusions:

  • The developed time-of-flight NMR imaging technique provides a powerful tool for visualizing fluid dynamics in porous media.
  • This method offers improved sensitivity and temporal resolution for studying complex flow phenomena.
  • The technique has direct applications in fields such as petroleum engineering and hydrogeology.