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Abstract

Summary

The hottest topic in geothermal energy development is the realization of enhanced geothermal systems in the ductile zone. The extraction of thermal energy may require from the surrounding rocks that may require hydraulic fracturing through rocks in the ductile zone. One of the key factors for the realization is, therefore, rock behaviour under high pressure and temperature conditions, where rocks are assumed to ductile materials. Though distinct element method is frequently used to understand failure mechanism of rock, hydraulic fracturing simulations including brittle-ductile transition has not been fully investigated. Considering fracture patterns and deformation of granite show drastic changes between brittle and ductile or at their transition, installation of the transitional behaviours is indispensable. In this study, hydraulic fracturing simulations with the degradation approaches, i.e. a bi-linear approximation model and a degradation model, to replicate semi-brittle or ductile behaviour at high temperature and confining pressure were demonstrated. The numerical simulation results showed that a bi-linear approximation model, which is suitable for replicating ductile behaviour of granite, gives the results consistent with the actual laboratory experiments under high temperature and confining pressure conditions. Moreover, it is indicated that joint modelling of both models could be useful to reproduce brittle-ductile transitional behaviours.

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/content/papers/10.3997/2214-4609.201900942
2019-06-03
2024-04-25

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References

  1. Al-Busaidi, A., Hazzard, J.F. and Young, R.P.
    [2004] Distinct element modeling of hydraulically fractured Lac du Bonnet granite. Journal of Geophysical Research, 110, B06302
     [Google Scholar]
  2. Brace, W.F., Walsh, J.B. and Frangos, W.T.
    [1968] Permeability of Granite under High Pressure. Journal of Geophysical Research, 73, 6, 2225–2236
     [Google Scholar]
  3. Hökmark, H., Lönnqvist, M. and Fälth, B.
    [2010] THM-issues in repository rock Thermal, mechanical thermo-mechanical and hydro-mechanical evolution of the rock at Forsmark and Laxemar sites. Technical report, TR-10-23, Swedish Nuclear Fuel and Waste Management Company
     [Google Scholar]
  4. Kumari, W.G.P., Ranjith, P.G., Perera, M.S.A., Shao, S., Chen, B.K., Lashin, A., AL Arifi, N. and Rathnaweera, T.D.
    [2017] Mechanical behavior of Australian Strathbogie granite under in-situ stress and temperature conditions: An application to geothermal energy extraction. Geothermics, 65, 44–59
     [Google Scholar]
  5. Li, W., Soliman, M. and Han, Y.
    [2016] Microscopic numerical modeling of Thermo-Hydro-Mechanical mechanisms in fluid injection process in unconsolidated formation. Journal of Petroleum Science and Engineering, 146, 959–970
     [Google Scholar]
  6. Ohtani, H., Mikada, H. and Junichi, T.
    [2019] Simulation of ductile failure of granite using DEM with adjusted bond strengths between elements in contact. 81st EAGE Conference & Exhibition 2019, Extended abstract, under review
     [Google Scholar]
  7. Potyondy, D.O. and Cundall, P.A.
    [2004] A bonded-particle model for rock. International Journal of Rock and Mining Sciences, 41, 8, 1329–1394
     [Google Scholar]
  8. Shimizu, H., Murata, S. and Ishida, T.
    [2011] The distinct element analysis for hydraulic fracturing in hard rock considering fluid viscosity and particle size distribution. International Journal of Rock and Mining Sciences, 48, 712–727
     [Google Scholar]
  9. Tomac, I. and Gutierrez, M.
    [2017] Coupled hydro-thermo-mechanical modeling of hydraulic fracturing in quasi-brittle rocks using BPM-DEM. Journal of Rock Mechanics and Geotechnical Engineering, 9, 92–104
     [Google Scholar]
  10. Tsuchiya, N., Asanuma, H., Okamoto, A., Sakaguchi, K., Hirano, N., Kizaki, A. and Watanabe, N.
    [2015] Fundamental Study for Beyond Brittle Geothermal Reservoirs. Proceedings World Geothermal Congress 2015
     [Google Scholar]
  11. Watanabe, N., Egawa, M., Sakaguchi, K., Ishibashi, T. and Tsuchiya, N.
    [2017] Hydraulic fracturing and permeability enhancement in granite from subcritical/brittle to supercritical/ductile conditions. Geophysical Research Letters, 44, 5468–5475
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900942
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Simulation of Hydraulic Fracturing Under Brittle-Ductile Transition Condition with Bond-Degradation Approaches
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201900942
/content/papers/10.3997/2214-4609.201900942
/content/papers/10.3997/2214-4609.201900942
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