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Gas Migration Studies using TOUGH2: Background, Conclusions & Future Work

Explore TOUGH2 studies on gas migration in porous media for radioactive waste disposal, plus conclusions and future research directions for better repository design and layout.

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Gas Migration Studies using TOUGH2: Background, Conclusions & Future Work

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  1. Gas migration studies using TOUGH2 Ellie Kuitunen UNTF 2010

  2. Contents • Background to disposal of L/ILW • TOUGH2 studies • Conclusions and future work

  3. Background

  4. Background

  5. TOUGH2 • Numerical simulator for modelling multiphase fluid flows in porous media • Developed at the Lawrence Berkeley National Laboratory • Used widely in radioactive waste disposal, contaminant transport, oil sequestration studies etc

  6. BACKFILL WASTE CANISTER CROSS-SECTION OF THE REPOSITORY TUNNEL Repository Processes • Re-saturation • Gas generation • 2-phase flow

  7. BACKFILLED TUNNEL Sg (air) = 90% P = atmospheric HOST ROCK Sg (air) = 0% P = 3 MPa 1 m 1 m 10 m 30 m

  8. Re-saturation – Top Cell

  9. Two-phase Flow H2 GROUNDWATER GROUNDWATER + H2 SINGLE PHASE 2-PHASE

  10. Two-phase Flow BACKFILLED TUNNEL Sg (H2) = 50% P = hydrostatic HOST ROCK Sg (H2) = 0% P = hydrostatic HOST ROCK Sg (H2) = 0% P = hydrostatic + 10 m 45 m

  11. Two-phase Flow

  12. Two-phase Flow

  13. Two-phase Flow

  14. Far-field Migration of Gases 900 m Gas generation 105m

  15. Far-field Migration of Gases

  16. Far-field Migration of Gases • Rock features • Rocks with different properties • Non-horizontal low permeability barrier • Faults

  17. Conclusions and Future Work • Initial studies • Demonstrated use of TOUGH2 • Improved understanding of the behaviour of gases • Parametric study to investigate different features of the repository • Design • Layout • Repository materials

  18. Thank you

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