The effect of supercritical CO2 on failure mechanisms of hot dry rock

Abstract

Hot dry rock is a clean, renewable resource of geothermal energy with good stability and a high utilization rate. Supercritical CO2 has shown promising results for improving the permeability and heat exchange of hot dry rock. In order to demonstrate the effect of supercritical CO2 on the failure mechanism of granite, the acoustic emission of granite during its failure process were studied in addition to X-ray diffraction, scanning electron microscopy, and optical electron microscopy investigations. The experimental results showed that for granite without supercritical CO2 treatment, as it approached failure, there were many acoustic emission events with a waiting time less than 0.0001 s, and that the power law exponent of the acoustic emission energy distribution decreased. The failure mechanisms were a combination of fracture and friction, with fracturing dominant. After immersion in supercritical CO2 , new cracks and pores appeared in the granite due to the dissolution of minerals, but friction was also a factor evidenced in particle crumbing. Generally, the acoustic emission statistical distributions of granite before and after supercritical CO2 soaking conformed to the seismic statistical distribution law. This study is conducive to increasing the understanding of artificial earthquakes induced by the development of hot dry rock.

Cited as: Li, H., Jiang, X., Xu, Z., Bowden, S. The effect of supercritical CO2 on failure mechanisms of hot dry rock. Advances in Geo-Energy Research, 2022, 6(4): 324-333. https://doi.org/10.46690/ager.2022.04.07

References

Anyim, K., Gan, Q. Fault zone exploitation in geothermal reservoirs: Production optimization, permeability evolution and induced seismicity. Advances in Geo-Energy Research, 2020, 4(1): 1-12.

Baisch, S., Weidler, R., Vörös, R., et al. A conceptual model for post-injection seismicity at Soultz-sous-Forêts. Transactions-Geothermal Resources Council, 2006, 30: 601-605.

Baró, J., Corral, A., Illa, X., et al. Statistical similarity between the compression of a porous material and earthquakes. Physical Review Letters, 2013, 110(8): 088702.

Baró, J., Vives, E. Analysis of power-law exponents by maximum-likelihood maps. Physical Review E, 2012, 85(6): 066121.

Bauke, H. Parameter estimation for power-law distributions by maximum likelihood methods. The European Physical Journal B, 2007, 58: 167-173.

Beckers, K. F., Lukawski, M. Z., Anderson, B. J., et al. Levelized costs of electricity and direct-use heat from Enhanced Geothermal Systems. Journal of Renewable and Sustainable Energy, 2014, 6(1): 013141.

Bongole, K., Sun, Z., Yao, J., et al. Multifracture response to supercritical CO2 -EGS and water-EGS based on thermo-hydro-mechanical coupling method. International Journal of Energy Research, 2019, 43(13): 7173-7196.

British Columbia Oil and Gas Commission. Investigation of observed seismicity in the Horn River basin. Technical Report, 2012.

Cai, C., Kang, Y., Wang, X., et al. Mechanism of supercritical carbon dioxide (SC-CO2 ) hydro-jet fracturing. Journal of CO2 Utilization, 2018, 26: 575-587.

Castillo-Villa, P. O., Baró, J., Planes, A., et al. Crackling noise during failure of alumina under compression: The effect of porosity. Journal of Physics: Condensed Matter, 2013, 25(29): 292202.

Chang, S. H., Lee, C. I. Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(7): 1069-1086.

Clauset, A., Shalizi, C. R., Newman, M. E. J. Power-law distributions in empirical data. SIAM Review, 2009, 51(4): 661-703.

Corral, A. Local distributions and rate fluctuations in a unified scaling law for earthquakes. Physical Review E, 2003, 68(3): 035102R. Davidsen, J., Kwiatek, G., Charalampidou, E. M., et al. Triggering processes in rock fracture. Physical Review Letters, 2017, 119(6): 068501.

Duchane, D., Brown, D. Hot dry rock (HDR) geothermal energy research and development at Fenton Hill, New Mexico. Geo-Heat Centre Quarterly Bulletin, 2002, 23: 13-19.

Eberhardt, E., Stead, D., Stimpson, B. Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression. International Journal of Rock Mechanics and Mining Sciences, 1999, 36(3): 361-380.

Ershadnia, R., Wallace, C. D., Soltanian, M. R. CO2 geological sequestration in heterogeneous binary media: Effects of geological and operational conditions. Advances in Geo-Energy Research, 2020, 4(4): 392-405.

Garcia, J., Hartline, C., Walters, M., et al. The northwest geysers EGS demonstration project, california: Part 1: Characterization and reservoir response to injection. Geothermics, 2016, 63: 97-119.

Goldstein, M. L., Morris, S. A., Yen, G. G. Problems with fitting to the power-law distribution. The European Physical Journal B-Condensed Matter and Complex Systems, 2004, 41(2): 255-258.

Haering, M. O., Schanz, U., Ladner, F., et al. Characterisation of the Basel 1 enhanced geothermal system. Geothermics, 2008, 37(5): 469-495.

Hofmann, H., Weides, S., Babadagli, T., et al. Potential for enhanced geothermal systems in Alberta, Canada. Energy, 2014, 69: 578-591.

Hou, Z. M., Kracke, T., Zhou, L., et al. Rock mechanical influences of hydraulic fracturing deep underground the North German Basin: Geological integrity of the cap rock salt and maximum magnitude of induced microseismicity based on the GeneSys stimulation in May 2011. ErdÖl Erdgas Kohle, 2012, 11: 454-460.

Jiang, X., Jiang, D., Chen, J., et al. Collapsing minerals: Crackling noise of sandstone and coal, and the predictability of mining accidents. American Mineralogist, 2016b, 101(12): 2751-2758.

Jiang, X., Liu, H., Main, I. G., et al. Predicting mining collapse: Superjerks and the appearance of record-breaking events in coal as collapse precursors. Physical Review E, 2017, 96(2): 023004.

Jiang, D., Xie, K., Jiang, X., et al. Statistical analysis of acoustic emission energy distribution during uniaxial compression of shale. Chinese Journal of Rock Mechanics and Engineering, 2016a, 35(S2): 3822-3828. (in Chinese)

Kim, J. S., Lee, K. S., Cho, W. J., et al. A comparative evaluation of stress-strain and acoustic emission methods for quantitative damage assessments of brittle rock. Rock Mechanics and Rock Engineering, 2015, 48: 495-508.

Kim, K. H., Ree, J. H., Kim, Y., et al. Assessing whether the 2017 Mw 5.4 Pohang earthquake in South Korea was an induced event. Science, 2018, 360(6392): 1007-1009.

Kun, F., Varga, I., Lennartz-Sassinek, S., et al. Approach to failure in porous granular materials under compression. Physical Review E, 2013, 88(6): 062207.

Legarth, B., Huenges, E., Zimmermann, G. Hydraulic fracturing in a sedimentary geothermal reservoir: Results and implications. International Journal of Rock Mechanics and Mining Sciences, 2005, 42(7-8): 1028-1041.

Li, H., Zhou, L., Lu, Y., et al. Changes in pore structure of dry-hot rock with supercritical CO2 treatment. Energy & Fuels, 2020a, 34(5): 6059-6068.

Li, H., Zhou, L., Lu, Y., et al. Influence of supercritical CO2 saturation on the failure process of hot dry rock with acoustic emission monitoring. Powder Technology, 2020b, 374: 241-249.

Lu, Y., Chen, X., Tang, J., et al. Relationship between pore structure and mechanical properties of shale on supercritical carbon dioxide saturation. Energy, 2019, 172: 270-285.

Luo, F., Xu, R., Jiang, P. Numerical investigation of fluid flow and heat transfer in a doublet enhanced geothermal system with CO2 as the working fluid (CO2 -EGS). Energy, 2014, 64: 307-322.

Nataf, G. F., Castillo-Villa, P. O., Bar ´o, J., et al. Avalanches in compressed porous SiO2 -based materials. Physical Review E, 2014a, 90(2): 022405.

Nataf, G. F., Castillo-Villa, P. O., Sellappan, P., et al. Predicting failure: Acoustic emission of berlinite under compression. Journal of Physics: Condensed Matter, 2014b, 26(27): 275401.

Pan, X., Chen, J., Jiang, D., et al. Statistical characteristics of sandstone acoustic emission under triaxial unloading confining pressure. Journal of China Coal Society, 2018, 43(10): 2750-2757. (in Chinese)

Salje, E. K. H., Dahmen, K. A. Crackling noise in disordered materials. Annual Review of Condensed Matter Physics, 2014, 5(1): 233-254.

Salje, E. K. H., Liu, H., Xiao, Y., et al. Avalanche mixing and the simultaneous collapse of two media under uniaxial stress. Physical Review E, 2019, 99(2): 023002.

Salje, E. K. H., Planes, A., Vives, E. Analysis of crackling noise using the maximum-likelihood method: Power-law mixing and exponential damping. Physical Review E, 2017, 96(4): 042122.

Salje, E. K. H., Soto-Parra, D. E., Planes, A., et al. Failure mechanism in porous materials under compression: Crackling noise in mesoporous SiO2 . Philosophical Magazine Letters, 2011, 91(8): 554-560.

Sathar, S., Worden, R. H., Faulkner, D. R., et al. The effect of oil saturation on the mechanism of compaction in granular materials: Higher oil saturations lead to more grain fracturing and less pressure solution. Journal of Sedimentary Research, 2012, 82(8): 571-584.

Soto-Parra, D., Vives, E., Botello-Zubiate, M. E., et al. Acoustic emission avalanches during compression of granular manganites. Applied Physics Letters, 2018, 112(25): 251906.

Utsu, T. Representation and analysis of the earthquake size distribution: A historical review and some new approaches. Pure and Applied Geophysics, 1999, 155: 509-535.

Xie, K., Jiang, X., Jiang, D., et al. Change of crackling noise in granite by thermal damage: Monitoring nuclear waste deposits. American Mineralogist, 2019, 104(11): 1578-1584.

Xie, K., Jiang, D., Sun, Z., et al. NMR, MRI and AE statistical study of damage due to a low number of wetting-drying cycles in sandstone from the Three Gorges Reservoir Area. Rock Mechanics and Rock Engineering, 2018, 51: 3625-3634.

Xu, T., Zhang, Y., Zeng, Z., et al. Technology progress in an enhanced geothermal system (hot dry rock). Science & Technology Review, 2012, 30(32): 42-45. (in Chinese)

Yin, H., Zhou, J., Xian, X., et al. Experimental study of the effects of sub-and super-critical CO2 saturation on the mechanical characteristics of organic-rich shales. Energy, 2017, 132: 84-95.

Zhang, C., Liang, W., Li, Z., et al. Observations of acoustic emission of three salt rocks under uniaxial compression. International Journal of Rock Mechanics and Mining Sciences, 2015, 77: 19-26.

Zhou, J., Hu, N., Xian, X., et al. Supercritical CO2 fracking for enhanced shale gas recovery and CO2 sequestration: Results, status and future challenges. Advances in Geo-Energy Research, 2019, 3(2): 207-224.