Geomechanics and Engineering

Techno-Press (테크노프레스)
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THM analysis for an in situ experiment using FLAC3D-TOUGH2 and an artificial neural network

  • Kwon, Sangki (Department of Energy Resources Engineering, Inha University) ;
  • Lee, Changsoo (Department of HLW disposal, Korea Atomic Energy Research Institute)
  • Received : 2018.03.20
  • Accepted : 2018.07.16
  • Published : 2018.11.20
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Abstract

The evaluation of Thermo-Hydro-Mechanical (THM) coupling behavior is important for the development of underground space for various purposes. For a high-level radioactive waste repository excavated in a deep underground rock mass, the accurate prediction of the complex THM behavior is essential for the long-term safety and stability assessment. In order to develop reliable THM analysis techniques effectively, an international cooperation project, Development of Coupled models and their Validation against Experiments (DECOVALEX), was carried out. In DECOVALEX-2015 Task B2, the in situ THM experiment that was conducted at Horonobe Underground Research Laboratory(URL) by Japan Atomic Energy Agency (JAEA), was modeled by the research teams from the participating countries. In this study, a THM coupling technique that combined TOUGH2 and FLAC3D was developed and applied to the THM analysis for the in situ experiment, in which rock, buffer, backfill, sand, and heater were installed. With the assistance of an artificial neural network, the boundary conditions for the experiment could be adequately implemented in the modeling. The thermal, hydraulic, and mechanical results from the modeling were compared with the measurements from the in situ THM experiment. The predicted buffer temperature from the THM modelling was about $10^{\circ}C$ higher than measurement near by the overpack. At the other locations far from the overpack, modelling predicted slightly lower temperature than measurement. Even though the magnitude of pressure from the modeling was different from the measurements, the general trends of the variation with time were found to be similar.

Keywords

Acknowledgement

Supported by : Inha University

References

  1. Carroll, K.C., Nguyen, B.N., Fang, Y., Richmond, M.C. and Murray, C.J. (2011), "Coupling of STOMP and ABAQUS for hydro-geomechanical modeling of fluid flow and rock deformation associated with subsurface $CO_2$ Injection", American Geophysical Union, Fall Meeting 2011, San Francisco,CA, USA.
  2. Dershowitz, W., Ambrose, R., Lim, D.H. and Cottrell, M. (2011), "Hydraulic fracture and natural fracture simulation for improved shale gas development", Proceedings of the AAPG Annual Convention and Exhibition, Houston, Texas, U.S.A.
  3. DOE (2012), Report on Modeling Coupled Processes in the Near Field of a Clay Repository, FCRD-UFD-2012-000223.
  4. Elyasi, A., Goshtasbi, K. and Hashemolhosseini, H. (2016), "A coupled geomechanical reservoir simulation analysis of $CO_2$-EOR: A case study", Geomech. Eng., 10(4), 423-436. https://doi.org/10.12989/GAE.2016.10.4.423
  5. Engelbrecht A.P. (2007), Computational Intelligence, John Wiley & Sons Ltd., Chichester, U.K.
  6. Gesto, J.M., Gens, A. and Arroyo, M. (2013), "THMC modelining of jet grouting", Proceedings of the 12th International Conference on Computational Plasticity: Fundamentals and Applications, Barcelona, Spain, September
  7. Gong, X. and Wan, R. (2013), "Simulation of geomechanical reservoir behavior during SAGD process using COMSOL multiphysics", Proceedings of the 2013 COMSIL Conference, Boston, Massachusetts, U.S.A.
  8. Guy, N., Enchery, G. and Renard, G. (2013), "Numerical modeling of thermal EOR: Comprehensive coupling of an AMR-based model of thermal fluid flow and geomechanics", Oil Gas Sci. Technol., 67(6), 1019-1028.
  9. Hu, L., Winterfeld, P.H., Fakcharoenphol, P. and Wu, Y.S.(2013), "A novel fully-coupled flow and geomechanics model in enhanced geothermal reservoirs", J. Petrol. Sci. Eng., 107, 1-11.
  10. Hudson, J.A., Stephasson, O. and Andersson, J. (2005), "Guidance on numerical modelling of thermo-hydro-mechanical coupled processes for performance assessment of radioactive waste repositories", Int. J. Rock Mech. Min. Sci., 42(5-6), 850-870. https://doi.org/10.1016/j.ijrmms.2005.03.018
  11. Itasca (2011), FLAC 7.0 User's Manual.
  12. Khan, S., Ansari, S., Khan, K. and Hussein, M. (2011), "Predicting wellbore stability in SAGD infill wells using 3D finite element modeling", Proceedings of the CSPG,CSEG,CWLS Convention, Calgary, Alberta, Canada, May.
  13. Klar, A., Soga, K. and Ng, M.Y.A. (2010), "Coupled deformation-flow analysis for methane hydrate extraction", Geotechnique, 60(10), 765-776. https://doi.org/10.1680/geot.9.P.079-3799
  14. Kwon, S., Lee, C., Jeon, S. and Choi, H.J. (2013), "Thermo-mechanical coupling analysis of APSE using submodels and neural networks", J. Rock Mech. Geotech. Eng., 5(1), 32-43. https://doi.org/10.1016/j.jrmge.2012.06.002
  15. Li, P. and Chalaturnyk, R.J. (2005), "Geomechanical model of oil sand", Proceedings of the SPE International Thermal Operations and Heavy Oil Symposium, Calgary, Alberta, Canada, November.
  16. Li, X., Zhang, C. and Rohlig, K.J. (2013), "Simulation of THM processes in buffer-rock barriers of high-level waste disposal in an argillaceous formation", J. Rock Mech. Geotech. Eng., 5(1), 277-286. https://doi.org/10.1016/j.jrmge.2012.09.002
  17. Loschetter, A., Smai, F., Sy, S., Burnol, A., Leynet, A., Lafortune, S. and Thoraval, A. (2012), "Simulation of $CO_2$ storage in coal seams: Coupling of TOUGH2 with the solver for mechanics CODE_ASTER(R)", Proceedings of the TOUGH Symposium 2012, LBNL, Berkeley, California, U.S.A.
  18. Magri, F., Tillner, E., Jolie, E., Kempka, T., Kolditz, O., Moeck, I., Wang, W., Watanabe, N. and Zimmermann, G. (2012), "3D numerical simulation of pore pressure and stress coupling for $CO_2$ storage in deep saline aquifers: A case study from the Northeast German Basin", Geophys. Res. Abstr., 14, EGU2012-3548.
  19. Pandey, S.N., Chaudhuri, A. and Kelkar, S. (2017), "A coupled thermo-hydro-mechanical modeling of fracture aperture alteration and reservoir deformation during heat extraction from a geothermal reservoir", Geothermics, 65, 17-31.
  20. Pruess, K., Oldenburg, C. and Moridis, G. (1999), TOUGH2 User's Guide, V2.0, Lawrence Berkeley National Laboratory Report LBNL-43134, Berkeley, California, U.S.A.
  21. Rutqvist, J. and Tsang, C.F. (2003), "TOUGH-FLAC: A numerical simulator for analysis of coupled thermal-hydrologic-mechanical processes in fractured and porous geological media under multi-phase flow conditions", Proceedings of the TOUGH Symposium 2003, Berkeley, California, U.S.A., May.
  22. Rutqvist, J. and Tsang, C.F. (2002), "A study of caprock hydromechanical changes associated with $CO_2$-injection into a brine formation", Environ. Geol., 42(2-3), 296-305. https://doi.org/10.1007/s00254-001-0499-2
  23. Rutqvist, J. and Moridis, G.J. (2008), Development of a Numerical Simulator for Analyzing the Geomechanical Performance of Hydrate-Bearing Sediments, Report Number: LBNL-467E.
  24. Rutqvist, J., Vasco, D.W. and Myer, L. (2010), "Coupled reservoir-geomechanical analysis of $CO_2$ injection and ground deformations at In Salah Algeria", Int. J. Greenhouse Gas Control, 4(2), 225-230. https://doi.org/10.1016/j.ijggc.2009.10.017
  25. Rutqvist, J. (2011), "Status of the TOUGH-FLAC simulator and recent applications related to coupled fluid flow and crustal deformations", Comput. Geosci., 37(6), 739-750. https://doi.org/10.1016/j.cageo.2010.08.006
  26. Shahrbanouzadeh, M., Barani, G.A. and Shojaee, S. (2015), "Analysis of flow through dam foundation by FEM and ANN models Case study: Shahid Abbaspour Dam", Geomech. Eng., 9(4), 465-481. https://doi.org/10.12989/gae.2015.9.4.465
  27. Stephen, W.W. (2011), EOS7C-ECBM Version 1.0: Additions for Enhanced Coal Bed Methane Including the Dusty Gas Model, Canyon Ridge Consulting Report CRC2011-0002, Sandia Park, New Mexico, U.S.A.
  28. Sugita Y., Massmann, J., Pan, P., Rutqvist, J. and Kwon, S. (2015), "Problem definition, team structure, achievement and issues Task 2, Decovalex-2015 project", Proceedings of the 7th DECOVALEX-2015 Workshop, Wakkanai, Horonobe, Japan.
  29. Tong F., Jing, L. and Zimmerman, R.W. (2010), "A fully coupled thermos-hydro-mechanical model for simulating multiphase flow, deformation and heat transfer in buffer material and rock masses", Int. J. Rock Mech. Min. Sci., 47, 205-217. https://doi.org/10.1016/j.ijrmms.2009.11.002
  30. Watanabe, N., McDermott, C.I., Wang, W., Taniguchi, T. and Kolditz, O. (2009), "Sensitivity analysis of thermo-hydro-mechanical(THM) coupled processes in a hot-dry-rock reservoir", Proceedings of the 34th Workshop on Geothermal Reservoir Engineering, Stanford, California, U.S.A., February.
  31. Yang, J., Chen, L., Liao, H. and Yang, F. (2013), "Simulation on THM coupling process of deep rock roadway with aquifer in coalmine", Adv. Mater. Res., 671-674, 1131-1134 https://doi.org/10.4028/www.scientific.net/AMR.671-674.1131
  32. Yildizdag, K. (2010), THM Modelling Manual of a 2D Tunnel for Disposal of Waste Repositories: Computed Thermal,Hydraulic and Mechanic Response of a 2D Axis-symmetric Tunnel Performed by the Software GeoSys/RockFlow, Lambert Academic Publishing.