Hydraulic and thermal fracturing techniques for successful stimulation in unconventional geothermal energy recovery
DOI:
https://doi.org/10.21701/bolgeomin.131.3.006Keywords:
CT scanning, geothermal, hydraulic fracturing, permeability, thermal fracturingAbstract
Unconventional or enhanced geothermal systems (EGSs) have been recently identified as potential geothermal resources which can be utilized to extract the heat trapped in the deep geological formations. However, due to the low formation porosity in these systems, an underground heat exchanger must be artificially created to enhance reservoir permeability. A number of reservoir stimulation techniques are adopted in EGSs to enhance their permeability, including hydraulic fracturing and thermal fracturing. The aim of the present work is to provide an in-depth understanding of these reservoir stimulation techniques based on our current laboratory experimental work. Recent literature on the topic has been comprehensively reviewed, and advanced laboratory tests have been conducted to understand hydraulic and thermal fracturing techniques under reservoir conditions. Experiments were conducted utilizing the high-temperature high-pressure rock tri-axial apparatus and quenching treatments were performed by injecting cold water into granite rocks heated to different temperatures. Flow-through experiments were also conducted on intact and fractured granite rocks and the results were compared to predict production enhancement upon stimulation. CT scanning technology was employed to determine micro-scale characteristics following stimulation. Experimental work revealed that the propagation paths and apertures of hydraulic and thermal fractures are controlled by the in-situ stress and temperature and the heterogeneity of the rock matrix. Although the induced fractures contributed substantial enhancement of reservoir permeability, they were sensitive to stress and temperature changes due to the larger effective stresses and thermally induced volumetric expansion.
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References
Blanton, T. L. An experimental study of interaction between hydraulically induced and pre-existing fractures. SPE Unconventional Gas Recovery Symposium, 1982. Society of Petroleum Engineers. https://doi.org/10.2523/10847-MS
Bose, C. C., Gul, A., Fairchild, B., Jones, T. & Barati, R. Nano-proppants for fracture conductivity improvement and fluid loss reduction. SPE Western Regional Meeting, 2015. Society of Petroleum Engineers. https://doi.org/10.2118/174037-MS
Breede, K., Dzebisashvili, K., Liu, X. & Falcone, G. 2013. A systematic review of enhanced (or engineered) geothermal systems: past, present and future. Geothermal Energy, 1, 4. https://doi.org/10.1186/2195-9706-1-4
Bunger, A., Jeffrey, R., Kear, J., Zhang, X. & Morgan, M. Experimental investigation of the interaction among closely spaced hydraulic fractures. 45th US Rock Mechanics/ Geomechanics Symposium, 2011. American Rock Mechanics Association. https://doi.org/10.2118/140426-MS
Bunger, A. P., Jeffrey, R. G. & Detournay, E. Application of scaling laws to laboratory-scale hydraulic fractures. Alaska Rocks 2005, The 40th US Symposium on Rock Mechanics (USRMS), 2005. American Rock Mechanics Association.
Chitrala, Y., Moreno, C., Sondergeld, C. & Rai, C. 2013. An experimental investigation into hydraulic fracture propagation under different applied stresses in tight sands using acoustic emissions. Journal of Petroleum Science and Engineering, 108, 151-161. https://doi.org/10.1016/j.petrol.2013.01.002
Deng, J., Lin, C., Yang, Q., Liu, Y., Tao, Z. & Duan, H. 2016. Investigation of directional hydraulic fracturing based on true tri-axial experiment and finite element modeling. Computers and Geotechnics, 75, 28-47. https://doi.org/10.1016/j.compgeo.2016.01.018
Dmitriev, A. P. 1972. Physical properties of rocks at high temperatures, National Aeronautics and Space Administration; National Technical Information Service, Springfield, Va.
Dwivedi, R. D., Goel, R. K., Prasad, V. V. R. & Sinha, A. 2008. Thermo-mechanical properties of Indian and other granites. International Journal of Rock Mechanics and Mining Sciences, 45, 303-315. https://doi.org/10.1016/j.ijrmms.2007.05.008
El Rabaa, W. Experimental study of hydraulic fracture geometry initiated from horizontal wells. SPE Annual Technical Conference and Exhibition, 1989. Society of Petroleum Engineers. https://doi.org/10.2118/19720-MS
Fallahzadeh, S., Rasouli, V. & Sarmadivaleh, M. 2015. An investigation of hydraulic fracturing initiation and near-wellbore propagation from perforated boreholes in tight formations. Rock Mechanics and Rock Engineering, 48, 573-584. https://doi.org/10.1007/s00603-014-0595-8
Fan, T.-G. & Zhang, G.-Q. 2014. Laboratory investigation of hydraulic fracture networks in formations with continuous orthogonal fractures. Energy, 74, 164-173. https://doi.org/10.1016/j.energy.2014.05.037
Fanning, D. S., Keramidas, V. Z. & El-Desoky, M. A. 1989. Micas. Minerals in soil environments, 551-634. Flores, M., Davies, D., Couples, G. & Palsson, B. Stimulation of geothermal wells: can we afford it? Proceedings World Geothermal Congress, 2005. 1. https://doi.org/10.2136/sssabookser1.2ed.c12
Fredrich, J. T. & Wong, T. F. 1986. Micromechanics of thermally induced cracking in three crustal rocks. Journal of Geophysical Research: Solid Earth, 91, 12743-12764. https://doi.org/10.1029/JB091iB12p12743
Geraud, Y. 1994. Variations of connected porosity and inferred permeability in a thermally cracked granite. Geophysical Research Letters, 21, 979-982. https://doi.org/10.1029/94GL00642
Gischig, V. S. & Preisig, G. Hydro-fracturing versus hydro-shearing: a critical assessment of two distinct reservoir stimulation mechanisms. 13th ISRM International Congress of Rock Mechanics, 2015. International Society for Rock Mechanics.
Greaves, G. N., Greer, A., Lakes, R. & Rouxel, T. 2011. Poisson's ratio and modern materials. Nature Materials, 10, 823-837. https://doi.org/10.1038/nmat3134
Guo, T., Zhang, S., Qu, Z., Zhou, T., Xiao, Y. & Gao, J. 2014. Experimental study of hydraulic fracturing for shale by stimulated reservoir volume. Fuel, 128, 373-380. https://doi.org/10.1016/j.fuel.2014.03.029
Haimson, B. & Fairhurst, C. 1967. Initiation and extension of hydraulic fractures in rocks. Society of Petroleum Engineers Journal, 7, 310-318. https://doi.org/10.2118/1710-PA
Heard, H. 1989. Thermal stress cracking in granite. Journal of Geophysical Research, 94, 1745-1758. Heuze, F. High-temperature mechanical, physical and thermal properties of granitic rocks-a review. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1983. Elsevier, 3-10. https://doi.org/10.1016/0148-9062(83)91609-1
Hogarth, R., Holl, H. & McMahon, A. Flow testing results from Habanero EGS Project. Proceedings Australian Geothermal Energy Conferences, 2013.
Huenges, E. "Enhanced geothermal systems: Review and status of research and development." Geothermal Power Generation. 2016. 743-761. https://doi.org/10.1016/B978-0-08-100337-4.00025-5
Hussain, A., Arif, S. M. & Aslam, M. 2017. Emerging renewable and sustainable energy technologies: State of the art. Renewable and Sustainable Energy Reviews, 71, 12-28. https://doi.org/10.1016/j.rser.2016.12.033
Jung, R., 2013, May. EGS-goodbye or back to the future. In ISRM International Conference for Effective and Sustainable Hydraulic Fracturing. International Society for Rock Mechanics and Rock Engineering. https://doi.org/10.5772/56458
Kitao, K., Ariki, K., Hatakeyama, K. & Wakita, K. 1990. Well stimulation using cold-water injection experiments in the Sumikawa geothermal field, Akita prefecture, Japan. Geothermal Resource Council Transactions, 14, 1219-1224.
Kumari, W., Ranjith, P., Perera, M., Shao, S., Chen, B., Lashin, A., Al Arifi, N. & Rathnaweera, T. 2017. Mechanical behaviour of Australian Strathbogie granite under in-situ stress and temperature conditions: An application to geothermal energy extraction. Geothermics, 65, 44-59. https://doi.org/10.1016/j.geothermics.2016.07.002
Kumari, W. G. P., Ranjith, P. G., Perera, M. S. A., Li, X., Li, L. H., Chen, B. K., Isaka, B. L. A. & Silva, V. R. S. D. 2018. Hydraulic fracturing under high temperature and pressure conditions with micro CT applications: Geothermal energy from hot dry rocks. Fuel, 230, 138-154. https://doi.org/10.1016/j.fuel.2018.05.040
Lemmon, E. W., Huber, M. L. & Mclinden, M. O. 2002. NIST reference fluid thermodynamic and transport properties- REFPROP. NIST standard reference database, 23, v7.
Liang, F., Sayed, M., Al-Muntasheri, G. A., Chang, F. F. & Li, L. 2016. A comprehensive review on proppant technologies. Petroleum, 2, 26-39. https://doi.org/10.1016/j.petlm.2015.11.001
Mao, R., Feng, Z., Liu, Z. & Zhao, Y. 2017. Laboratory hydraulic fracturing test on large-scale pre-cracked granite specimens. Journal of Natural Gas Science and Engineering, 44, 278-286. https://doi.org/10.1016/j.jngse.2017.03.037
Ohno, I. 1995. Temperature variation of elastic properties of alpha quartz up to the alpha beta transition. Journal of Physics of the Earth, 43, 157-169. https://doi.org/10.4294/jpe1952.43.157
Sarmadivaleh, M. 2012. Experimental and numerical study of interaction of a pre-existing natural interface and an induced hydraulic fracture. PhD, Curtin University.
Sarmadivaleh, M., Joodi, B., Nabipour, A. & Rasouli, V. 2013. Steps to conducting a valid hydraulic-fracturing laboratory test. The APPEA Journal, 53, 347-354. https://doi.org/10.1071/AJ12029
Schill, E., Cuenot, N., Genter, A. & Kohl, T. Review of the hydraulic development in the multi-reservoir/multi-well EGS project of Soultz-sous-Forets. Proceedings World Geothermal Congress 2015, 2015. 19-25.
Shao, S. 2015. Coupled Thermo-Hydro-Mechanical (THM) Behaviour of Rock Relevant to the Geothermal Industry (Doctoral dissertation). PhD, Monash University.
Shao, S., Wasantha, P. L. P., Ranjith, P. G. & Chen, B. K. 2014. Effect of cooling rate on the mechanical behavior of heated Strathbogie granite with different grain sizes. International Journal of Rock Mechanics and Mining Sciences, 70, 381-387. https://doi.org/10.1016/j.ijrmms.2014.04.003
Siratovich, P. A., Villeneuve, M. C., Cole, J. W., Kennedy, B. M. & Bégué, F. 2015. Saturated heating and quenching of three crustal rocks and implications for thermal stimulation of permeability in geothermal reservoirs. International Journal of Rock Mechanics and Mining Sciences, 80, 265-280. https://doi.org/10.1016/j.ijrmms.2015.09.023
Stephens, G. & Voight, B. 1982. Hydraulic fracturing theory for conditions of thermal stress. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 19, 279-284. https://doi.org/10.1016/0148-9062(82)91364-X
Tarasovs, S. and Ghassemi, A., 2011, January. Propagation of a system of cracks under thermal stress. In 45th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association.
Walsh, J. 1965. The effect of cracks in rocks on Poisson's ratio. Journal of Geophysical Research, 70, 5249-5257. https://doi.org/10.1029/JZ070i020p05249
Wanniarachchi, W.A.M., Gamage, R.P., Perera, M.S.A., Rathnaweera, T.D., Gao, M. and Padmanabhan, E., 2017. Investigation of depth and injection pressure effects on breakdown pressure and fracture permeability of shale reservoirs: an experimental study. Applied Sciences, 7(7), p.664. https://doi.org/10.3390/app7070664
Watanabe, K. & Takahashi, H. 1995. Fractal geometry characterization of geothermal reservoir fracture networks. Journal of Geophysical Research: Solid Earth (1978-2012), 100, 521-528. https://doi.org/10.1029/94JB02167
Wong, T.-F. 1982. Effects of temperature and pressure on failure and post-failure behavior of Westerly granite. Mechanics of Materials, 1, 3-17. https://doi.org/10.1016/0167-6636(82)90020-5
Wong, T.-F. & Brace, W. 1979. Thermal expansion of rocks: some measurements at high pressure. Tectonophysics, 57, 95-117. https://doi.org/10.1016/0040-1951(79)90143-4
Xu, X.-L., Gao, F., Shen, X.-M. & Xie, H.-P. 2008. Mechanical characteristics and microcosmic mechanisms of granite under temperature loads. Journal of China University of Mining and Technology, 18, 413-417. https://doi.org/10.1016/S1006-1266(08)60086-3
Yasuhara, H. & Elsworth, D. 2008. Compaction of a rock fracture moderated by competing roles of stress corrosion and pressure solution. Pure and Applied Geophysics, 165, 1289-1306. https://doi.org/10.1007/s00024-008-0356-2
Zhou, C., Wan, Z., Zhang, Y. & Gu, B. 2018. Experimental study on hydraulic fracturing of granite under thermal shock. Geothermics, 71, 146-155. https://doi.org/10.1016/j.geothermics.2017.09.006
Zhou, J., Chen, M., Jin, Y. & Zhang, G.-Q. 2008. Analysis of fracture propagation behavior and fracture geometry using a tri-axial fracturing system in naturally fractured reservoirs. International Journal of Rock Mechanics and Mining Sciences, 45, 1143-1152. https://doi.org/10.1016/j.ijrmms.2008.01.001
Zimmermann, G. & Reinicke, A. 2010. Hydraulic stimulation of a deep sandstone reservoir to develop an Enhanced Geothermal System: Laboratory and field experiments. Geothermics, 39, 70-77. https://doi.org/10.1016/j.geothermics.2009.12.003
Zoback, M., Rummel, F., Jung, R. & Raleigh, C. 1977. Laboratory hydraulic fracturing experiments in intact and pre-fractured rock. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 14, 49-58. https://doi.org/10.1016/0148-9062(77)90196-6
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