Abstract
Geothermal energy is the thermal energy stored in the earth. Favorable geological settings consist of deep granite covered by a layer of insulating sediments which minimizes heat loss over the time. The key problem stems from the fact that the rock formations which are candidates for geothermal exploitation are located at great depth and that, even if they are locally fractured, their permeability is very low, regarding their economic viability. Indeed, in order to extract the heat, the project consists in artificially fracturing the rock, and next in creating a closed loop. Once at ground level, hot water can be used to generate electricity, or else to feed heat circuits. Heat production is simulated in a thermo-poroelastic framework incorporating a crack propagation model to simulate hydrofracturing processes. Stimulation and circulation tests at the Soultz-sous-Forêts reservoir conducted in 1997 are run in a finite element setting with emphasis on the impedance and efficiency of Enhanced Geothermal Systems (EGSs). The particular configuration of a porous medium with two porosities and individual constituent temperatures is also shown to be relevant in the early times of the injection operations in EGS.
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Notes
- 1.
- 2.
Annual consumption per capita in France in 2015: 476 TWh/66 M \(\sim \) 7.2 MWh, equivalent to a power of 7.2/(365\(\times \)24) MWe \(=\) 0.82 kWe, equivalent to 0.82 MWe for 1000 people.
- 3.
As a matter of comparison, the content of an Olympic swimming pool 50 m\(\times \)25 m\(\times \)2 m is equal to 2500 m\(^3\).
- 4.
http://www.haute-sorne.ch/fr/Vivre/Geothermie/Geothermie-profonde-Haute-Sorne.html (last visit: August 25, 2017).
- 5.
The radial component of the convective acceleration is equal to \(v_r\,\partial v_r/\partial r=(\phi /r)\partial (\phi /r)/\partial r\) with \(\phi =r\,v_r\). If \(\phi =\phi (z)\), this component simplifies to \(-\phi (z)^2/r^3\), and the radial equation becomes nonlinear.
- 6.
The vertical geostatic stress accounts for the apparent mass density of the rock, say \(\rho =n_{r}\,\rho _{r}+n_{f}\,\rho _{f}\) where \(n_{k}\) and \(\rho _{k}\) are, respectively, the volume fraction and the mass density of the constituent k, namely rock or fluid. In contrast, the lithostatic stress which accounts only for the mass of the rock is calculated with the mass density \(\rho =n_{r}\,\rho _{r}\). Unless tectonic stresses have developed significantly in the zone, the horizontal stresses are often assumed to be equal and calculated assuming an isotropic elastic rock formation with drained Poisson’s ratio \(\nu \): under lateral confinement (zero horizontal strain), they scale with the vertical stress via a factor \(\nu /(1-\nu )\).
- 7.
Compare with Fig. 7.26 where the maximum permeability enhancement was obtained at year 1 for the same injection pressure profile.
References
AbuAisha, M. (2014). Enhanced geothermal systems: Permeability stimulation through hydraulic fracturing in a thermo-poroelastic framework. Ph.D. thesis, Université de Grenoble, France (2014).
AbuAisha, M., & Loret, B. (2016a). Influence of hydraulic fracturing on impedance and efficiency of thermal recovery from HDR reservoirs. Geomechanics for Energy and the Environment. https://doi.org/10.1016/j.gete.2016.02.001.
AbuAisha, M., & Loret, B. (2016b). Stabilization of forced heat convection: Applications to enhanced geothermal systems (EGS). Transport Porous Media. https://doi.org/10.1007/s11242-016-0642-x.
AbuAisha, M., Loret, B., & Eaton, D. (2016). Enhanced geothermal systems (EGS): Hydraulic fracturing in a thermo-poroelastic framework. Journal of Petroleum Science and Engineering, 146, 1179–1191.
Anderson, D. N., & Lund, J. W. (1979). Direct utilization of geothermal energy: A technical handbook. In D. N. Anderson & J. W. Lund (Eds.), Geothermal Resources Council, Special report \({\rm n}^{\circ }8\) (250 pp.), Davis, CA, USA.
Atkinson, B. K. (1991). Fracture mechanics of rock (2nd ed.). London: Academic Press Limited.
Baisch, S., Weidler, R., Vörös, R., Wyborn, D., & de Graaf, L. (2006). Induced seismicity during the stimulation of a geothermal HFR reservoir in the Cooper Basin, Australia. Bulletin Seismological Society America, 96, 2242–2256.
Barenblatt, G. I., Zheltov, Y. P., & Kochina, I. N. (1960). Basic concepts in the theory of seepage of homogeneous liquids in fissured rocks. Journal of Applied Mathematics and Mechanics (PMM) (English Translation), 24(5), 1286–1303.
Bataillé, A., Genthon, P., Rabinowicz, M., & Fritz, B. (2006). Modeling the coupling between free and forced convection in a vertical permeable slot: Implications for the heat production of an Enhanced Geothermal System. Geothermics, 35, 654–682.
Baumgärtner J., Jung R., Gérard A., Baria R., & Garnish, J. (1996, January 22–24). The European HDR project at Soultz-sous-Forêts: Stimulation of the second deep well and first circulation experiments. Proceedings of the 21st Workshop on Geothermal Reservoir Engineering. Stanford University, Stanford, California.
Baumgärtner, J., Gérard, A., Baria, R., & Garnish, J. (2000, January 24–26). Progress at the European HDR project at Soultz-sous-Forêts: Preliminary results from the deepening of the well GPK2 to 5000 m. Proceedings of the 25th Workshop on Geothermal Reservoir Engineering. Stanford University, Stanford, California.
Beardsmore, G. R. (2007). The burgeoning Australian geothermal energy industry. Geo-Heat Center Bulletin, 28(3), 20–26.
Bertani, R. (2015, April 19–25). Geothermal Power Generation in the World 2010–2014 Update Report, 19 pp. Proceedings World Geothermal Congress 2015. Melbourne, Australia.
Blaisonneau, A., Peter-Borie, M., & Gentier, S. (2013). Experimental study of the permeability evolution of a rock fracture under THMC conditions. In M. Kwasniewski & D. Lydzba (Eds.), Proceedings Rock Mechanics for Resources, Energy and Environment (pp. 217–222). London: Taylor & Francis Group. ISBN 978-1-138-00080-3.
Brown, D. W., Franke, P. R., Smith, M. C., & Wilson, M. G. (1987). Hot Dry Rock Geothermal Energy Development Program. Annual Report Fiscal Year 1985 LA-11101-HDR.
Brown, D., & Duchane, D. (1999). Scientific progress on the Fenton Hill HDR project since 1983. Geothermics, 28, 591–601.
Brown, D. (2009, February 9–11). Hot dry rock geothermal energy: important lessons from Fenton Hill. In Proceedings of the 34th Workshop on Geothermal Reservoir Engineering. Stanford University, Stanford, California.
Bruel, D. (1995). Modelling heat extraction from forced fluid flow through stimulated fractured rock masses: Evaluation of the Soultz-sous-Forêts site potential. Geothermics, 24(3), 439–450.
Bruel, D. (2002). Impact of induced thermal stresses during circulation tests in an engineered fractured geothermal reservoir. Oil & Gas Science and Technology, 57(5), 459–470.
Chen, Y., Zhou, C., & Sheng, Y. (2007). Formulation of strain-dependent hydraulic conductivity for a fractured rock mass. The International Journal of Rock Mechanics and Mining Sciences, 44(7), 981–996.
Cheng, A. H.-D., Ghassemi, A., & Detournay, E. (2001). Integral equation solution of heat extraction from a fracture in hot dry rock. International Journal for Numerical Analytical Methods Geomechanics, 25, 1327–1338.
Duchane, D., & Brown, D. (2002, December 13–19). Hot Dry Rock (HDR) geothermal energy research and development at Fenton Hill, New Mexico. Geo-Heat Center Bulletin.
Elsworth, D., & Bai, M. (1992). Flow-deformation response of dual-porosity media. Journal of Geotechnical Engineering, 118(1), 107–124.
Evans, K., Genter, A., & Sausse, J. (2005). Permeability creation and damage due to massive fluid injections into granite at 3.5 km at Soultz: 1. Borehole observations. Journal of Geophysical Research, 110, B04203. https://doi.org/10.1029/2004JB003168.
Evans, K., Valley, B., Häring, M., Hopkirk, R., Baujard, C., & Kohl, Th., et al., (2009). Studies and support for the EGS reservoirs at Soultz-sous-Forêts. Technical report, Center for Geothermal Research, University of Neuchâtel, Switzerland.
Fjaer, E., Holt, R. M., Horsrud, P., Raaen, A. M., & Risnes, R. (2008). Petroleum related rock mechanics (2nd ed.). Amsterdam: Elsevier B.V.
Francke, H., & Thorade, M. (2010). Density and viscosity of brine: An overview from a process engineers perspective. Chemie der Erde, 70(S3), 23–32.
Fritz, B., Jacquot, E., Jacquemont, B., Baldeyrou-Bailly, A., Rosener, M., & Vidal, O. (2010). Geochemical modelling of fluid-rock interactions in the context of the Soultz-sous-Forêts geothermal system. Compte Rendus Geoscience, 342(7–8), 653–667.
Garcia-Gutiérrez, A., Espinosa–Paredes, G., & Amaro-Espejo, G. (2005, April 24–29). Effect of variable rheological properties of drilling muds and cements on the temperature distribution in geothermal wells. Proceedings of World Geothermal Congress 2005. Antalya, Turkey.
Gelet, R. (2011, September). Thermo-hydro-mechanics of deformable porous media with double porosity and local thermal non-equilibrium. Ph.D. thesis, Université de Grenoble, France. https://tel.archives-ouvertes.fr/tel-00712459.
Gelet, R. M., Loret, B., & Khalili, N. (2012a). Thermal recovery from a fractured medium in local thermal non-equilibrium. International Journal for Numerical and Analytical Methods in Geomechanics, 37(15), 2471–2501.
Gelet, R., Loret, B., & Khalili, N. (2012b). A thermo-hydro-mechanical coupled model in local thermal non-equilibrium for fractured HDR reservoir with double porosity. Journal of Geophysical Research, Solid Earth, 117, B07205. https://doi.org/10.1029/2012JB009161.
Gelet, R., Loret, B., & Khalili, N. (2012c). Borehole stability analysis in a thermoporoelastic dual-porosity medium. International Journal of Rock Mechanics and Mining Sciences, 50, 65–76. https://doi.org/10.1016/j.ijrmms.2011.12.003.
Gérard, A., Genter, A., Kohl, Th., Lutz, Ph., Rose, P., & Rummel, F. (2006). The deep EGS (Enhanced Geothermal System) project at Soultz-sous-Forêts (Alsace, France). Geothermics, 35(5–6), 473–483.
Ghassemi, A., Tarasovs, S., & Cheng, A. H.-D. (2005). Integral equation solution of heat extraction-induced thermal stress in enhanced geothermal reservoirs. International Journal for Numerical and Analytical Methods in Geomechanics, 29, 829–844.
Ghassemi, A., Nygren, A., & Cheng, A. (2008). Effects of heat extraction on fracture aperture: A poro-thermoelastic analysis. Geothermics, 37, 525–539.
Grecksch G., Jung R., Tischner T., & Weidler, R. (2003). Hydraulic fracturing at the European HDR / HFR test site Soultz-sous-Forêts (France) - a conceptual model. Proceedings of the European Geothermal Conference. Leibniz Institute for Applied Geosciences GGA, Germany.
Gringarten, A. C., Witherspoon, P. A., & Onishi, Y. (1975). Theory of heat extraction from fractured hot dry rock. Journal of Geophysical Research, 80(8), 1120–1124.
Häring, M. O., Schanz, U., Ladner, F., & Dyer, B. C. (2008). Characterization of the Basel 1 enhanced geothermal system. Geothermics, 37, 469–495.
Jiang, F. M., Luo, L., & Chen, J. L. (2013). A novel three-dimensional transient model for subsurface heat exchange in enhanced geothermal systems. International Communications in Heat and Mass Transfer, 41, 57–62.
Jupe, A. J., Bruel, D., Hicks, T., Hopkirk, R., Kappelmeyer, O., Kohl, T., et al. (1995). Modelling of a European prototype HDR reservoir. Geothermics, 24(3), 403–419.
Kagel, A., Bates, D., & Gawell, K. (2005, April 22). A guide to geothermal energy and the environment, Pennsylvania Ave. SE, Washington, DC: Geothermal Energy Association. Retrieved from August 16, 2017. http://www.charleswmoore.org/pdf/Environmental Guide.pdf.
Kaieda, H., Jones, R. H., Moriya, H., Sasaki, S., & Ushijima, K. (2000, May 28–June 10). Ogachi HDR reservoir evaluation by AE and geophysical methods. Proceedings World Geothermal Congress 2000 (pp. 3755–3760). Kyushu - Tohoku, Japan.
Kaieda, H., Sasaki, S., & Wyborn, D. (2010, April 25–29). Comparison of characteristics of micro-earthquakes observed during hydraulic stimulation operations in Ogachi, Hijiori and Cooper Basin HDR Projects. Proceedings World Geothermal Congress 2010, 6 pp. Bali, Indonesia.
Khalili, N., & Loret, B. (2001). An elasto-plastic model for non-isothermal analysis of flow and deformation in unsaturated porous media formulation. International Journal of Solids Structures, 38, 8305–8330.
Khalili, N., & Valliappan, S. (1996). Unified theory of flow and deformation in double porous media. European Journal of Mechanics, 15(2), 321–336.
Klimczak, C., Schultz, R. A., Parashar, R., & Reeves, D. (2010). Cubic law with aperture-length correlation: Implications for network scale fluid flow. Hydrogeology Journal, 18(4), 851–862.
Kneafsey, T. J., Nakagawa, S., Dobson, P. F., & Kennedy, B. M. (2015, January 26–28). Fracture sustainability in EGS systems - results of laboratory studies. Proceedings of the Fourtieth Workshop on Geothermal Reservoir Engineering (pp. 676–684). Stanford University, Stanford, California.
Kohl, Th., & Mégel, T. (2007). Predictive modeling of reservoir response to hydraulic stimulations at the European EGS site Soultz-sous-Forêts. International Journal of Rock Mechanics and Mining Sciences, 44(8), 1118–1131.
Kolditz, O. (1995). Modelling flow and heat transfer in fractured rocks: Dimensional effect of matrix heat diffusion. Geothermics, 24(3), 421–437.
Kolditz, O., & Clauser, C. (1998). Numerical simulation of flow and heat transfer in fractured crystalline rocks: Application to the hot dry rock site in Rosemanowes (U.K.). Geothermics, 27(1), 1–23.
Lee, S. H., & Ghassemi, A. (2010, February 1–3). Thermo-poroelastic analysis of injection-induced rock deformation and damage evolution. Proceedings of the Thirty-Fifth Workshop on Geothermal Reservoir Engineering. Stanford: Stanford University.
Lee, S. H., & Ghassemi, A. (2011, January 31–February 03). Three-dimensional thermo-poro-mechanical modeling of reservoir stimulation and induced microseismicity in geothermal reservoir. Proceedings of the Thirty-Sixth Workshop on Geothermal Reservoir Engineering. Stanford University, Stanford, California.
Likhachev, E. R. (2003). Dependence of water viscosity on temperature and pressure. Technical Physics, 48(4), 514–515.
Loret, B., & Khalili, N. (2002). An effective stress elastic-plastic model for unsaturated soils. Mechanics of Materials, 34(2), 97–116.
Loret, B., & Simões, M. F. (2016). Biomechanical aspects of soft tissues. Boca Raton, FL: CRC Press.
Lund, J., Sanner, B., Rybach, L., Curtis, R., & Hellström, G. (2004). Geothermal (ground-source) heat pumps: A world overview. Geo-Heat Center Bulletin, 1–10.
Lund, J. W. (2007). Characteristics, development and utilization of geothermal resources. Geo-Heat Center Bulletin, pp. 1–9.
Lund, J. W., & Boyd, T. (2015, April 19–25). Direct utilization of geothermal energy 2015 worldwide review. In Proceedings of the World Geothermal Congress. Melbourne, Australia, 31 pp.
McTigue, D. F. (1986). Thermoelastic response of fluid-saturated porous rock. Journal of Geophysical Research, 91(B9), 9533–9542.
Murphy, H. D., Lawton, R. G., Tester, J. W., Potter, R. M., Brown, D. W., & Aamodt, R. L. (1977). Preliminary assessment of a geothermal energy reservoir formed by hydraulic fracturing. Society of Petroleum Engineers Journal, 17, 317–326.
Murphy, H. D., Tester, J. W., Grigsby, C. O., & Potter, R. M. (1981). Energy extraction from fractured geothermal reservoirs in low-permeability crystalline rock. Journal of Geophysical Research, Solid Earth, 86(B8), 7145–7158.
Murphy, H., Brown, D., Jung, R., Matsunaga, I., & Parker, R. (1999). Hydraulics and well testing of engineered geothermal reservoirs. Geothermics, 28, 491–506.
Papanastasiou, P. (1999). The effective fracture toughness in hydraulic fracturing. International Journal of Fracture, 96, 127–147.
Papanastasiou, P., & Thiercelin, M. (1993). Influence of inelastic rock behaviour in hydraulic fracturing. International Journal of Rock Mechanics and Mining Sciences, 30(7), 1241–1247.
Rejeb, A., & Bruel, D. (2001). Hydromechanical effects of shaft sinking at the Sellafield site. International Journal of Rock Mechanics and Mining Sciences, 38(1), 17–29.
Richards, H. G., Parker, R. H., Green, A. S. P., Jones, R. H., Nicholls, J. D. M., Nicol, D. A. C., et al. (1994). The performance and characteristics of the experimental hot dry rock geothermal reservoir at Rosemanowes, Cornwall (1985–1988). Geothermics, 23(2), 73–109.
Santoyo, E., Santoyo-Gutiérrez, S., García, A., Espinosa, G., & Moya, S. L. (2001). Rheological property measurement of drilling fluids used in geothermal wells. Applied Thermal Engineering, 21, 283–302.
Schulze, O., Popp, T., & Kern, H. (2001). Development of damage and permeability in deforming rock salt. Engineering Geology, 61, 163–180.
Shao, J. F., Zhou, H., & Chau, K. T. (2005). Coupling between anisotropic damage and permeability variation in brittle rocks. International Journal for Numerical and Analytical Methods in Geomechanics, 29(12), 1231–1247.
Solberg, P., Lockner, D., & Byerlee, J. D. (1980). Hydraulic fracturing in granite under geothermal conditions. International Journal of Rock Mechanics and Mining Sciences, 17, 25–33.
Souley, M., Homand, F., Pepa, S., & Hoxha, D. (2002). Damage-induced permeability changes in granite: A case example at the URL in Canada. International Journal of Rock Mechanics and Mining Sciences, 38(2), 297–310.
Soultz-sous-Forêts project. (2006). The deep EGS (Enhanced Geothermal System) project at Soultz-sous-Forêts (Alsace, France). Geothermics, 35, 473–483.
Taron, J., & Elsworth, D. (2009). Thermal-hydrologic-mechanical-chemical processes in the evolution of engineered geothermal reservoirs. International Journal of Rock Mechanics and Mining Sciences, 46, 855–864.
Tenma, N., Yamaguchi, T., & Zyvoloski, G. (2008). The Hijiori Hot Dry Rock test site, Japan. Evaluation and optimization of heat extraction from a two-layered reservoir. Geothermics, 37, 19–52.
Tenzer, H. (2001). Development of hot dry rock technology. Geo-Heat Center Bulletin, 32, 14–22.
Turcotte, D. L., & Schubert, G. (2002). Geodynamics (2nd ed.). Cambridge: Cambridge University Press.
Warren, J. E., & Root, P. J. (1963). The behavior of naturally fractured reservoirs. Society of Petroleum Engineers Journal, 3, 245–255.
Watanabe, N., Egawa, M., Sakaguchi, K., Ishibashi, T., & Tsuchiya, N. (2017). Hydraulic fracturing and permeability enhancement in granite from subcritical/brittle to supercritical/ductile conditions. Geophysical Research Letters, 44, 5468–5475. https://doi.org/10.1002/2017GL073898.
White, D. E. (1973). Characteristics of geothermal resources and problems of utilization. In P. Kruger & C. Otte (Eds.), Geothermal energy - resources, production, stimulation (pp. 69–94). Stanford: Stanford University Press.
Xie, L., Min, K. B., & Song, Y. (2015). Observations of hydraulic stimulations in seven enhanced geothermal system projects. Renewable Energy, 79, 56–65.
Zhou, X. X., Ghassemi, A., & Cheng, A. H.-D. (2009). A three-dimensional integral equation model for calculating poro- and thermoelastic stresses induced by cold water injection into a geothermal reservoir. International Journal for Numerical and Analytical Methods in Geomechanics, 33(14), 1613–1640.
Zyvoloski, G. A., Aamodt, R. L., Aguilar, R. G., et al. (1981). Evaluation of the second hot dry rock geothermal energy reservoir: Results of Phase I, Run Segment 5, Technical Report LA-8940-HDR, 94 pp. Los Alamos: Los Alamos National Laboratory.
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Loret, B. (2019). Enhanced Geothermal Systems (EGS): Hydraulic Fracturing in a Thermo-Poroelastic Framework. In: Fluid Injection in Deformable Geological Formations. Springer, Cham. https://doi.org/10.1007/978-3-319-94217-9_7
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