0

Full Content is available to subscribers

Subscribe/Learn More  >

Reactive Geochemical Flow Modeling With CT Scanned Rock Fractures

[+] Author Affiliations
Dustin Crandall

National Energy Technology Laboratory, Morgantown, WV

Hang Wen, Li Li

Pennsylvania State University, University Park, PA

Alexandra Hakala

National Energy Technology Laboratory, Pittsburgh, PA

Paper No. FEDSM2014-21579, pp. V01CT24A004; 10 pages
doi:10.1115/FEDSM2014-21579
From:
  • ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1C, Symposia: Fundamental Issues and Perspectives in Fluid Mechanics; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Gas-Solid Flows: Dedicated to the Memory of Professor Clayton T. Crowe; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes
  • Chicago, Illinois, USA, August 3–7, 2014
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4623-0
  • Copyright © 2014 by ASME

abstract

Obtaining quality three-dimensional geometries of fractures in a natural medium, such as rock, is a non-trivial task. This paper describes how several geothermal fractured rocks were scanned using computed tomography (CT), the reconstruction procedure to generate the three-dimensional (3D) geometry of the fractured rock, and the methodology for isolating the fracture from the CT scan. A conversion process to capture the relevant geometric features of the fracture is then discussed. The scanned aperture distribution was then used to simulate the reactive flow and transport processes using a reactive transport code CrunchFlow. The accurate use of CT images in fluid flow models within complex structures allows detailed understanding on how the aperture distribution affects mineral dissolution and fracture property evolution during the EGS process. Our preliminary simulation results show the formation of the preferential flow in zones with larger apertures, which led to higher calcite dissolution rates and even larger aperture size over time in these zones. Because calcite only occupied 10% of the solid phase, its dissolution did not completely open up the aperture because other relatively non-reactive minerals (clay and quartz) remained. The traditional measure of mechanical aperture could not take into account the partial increase in void space in the rock matrix and underestimated the increase in average aperture. The chemical and hydraulic apertures, which explicitly take into account changes in mineral volumes in the rock matrix, relate better to the overall change in the effective permeability of the sample.

Copyright © 2014 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In