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Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography
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Event-based contact angle measurements inside porous media using time-resolved micro-computed tomography.

Arjen Mascini1, Veerle Cnudde2, Tom Bultreys1

  • 1PProGRess/UGCT, Dept. of Geology, Ghent University, Krijgslaan 281/ S8, 9000 Ghent, Belgium.

Journal of Colloid and Interface Science
|April 8, 2020
PubMed
Summary

Analyzing fluid invasion events using time-resolved micro-computed tomography (mCT) provides more accurate pore-scale wettability characterization than static methods. This approach yields narrower, consistent contact angle distributions relevant to fluid dynamics.

Keywords:
Contact angleHaines jumpImagingInterfacial curvatureMultiphase flowPore-scalePorous mediaPrimary drainageWettabilityX-ray micro-tomography

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Area of Science:

  • Porous media physics
  • Multiphase flow dynamics
  • Advanced imaging techniques

Background:

  • Pore-scale wettability significantly influences multiphase flow in porous materials.
  • Static micro-computed tomography (mCT) studies reveal unexpectedly broad contact angle distributions.
  • Fluid dynamics may be better understood through time-resolved mCT analysis of invasion events.

Purpose of the Study:

  • To investigate the relevance of time-resolved mCT data for fluid dynamics.
  • To develop and apply a novel method for measuring contact angles during dynamic fluid invasion.
  • To compare dynamic contact angle measurements with traditional static methods.

Main Methods:

  • Utilized time-resolved mCT datasets of fluid drainage in glass bead packs and limestone.
  • Approximated receding contact angles locally in time and space prior to meniscus entry into pores.
  • Introduced a new force-based contact angle definition to match capillary pressure in invaded pore throats.

Main Results:

  • Geometric and force-based contact angles exhibited plausible, narrower distributions and were mutually consistent.
  • The novel methods provided more reliable wettability characterization compared to classical approaches.
  • Thermodynamically consistent methods proved sensitive to imaging artifacts and dissipation, yielding less credible results.

Conclusions:

  • Time-resolved mCT analysis offers a more appropriate method for pore-scale wettability characterization.
  • Dynamic analysis is crucial for accurately modeling fluid dynamics in porous media.
  • Further refinement is needed to reduce image analysis uncertainties in time-resolved mCT.