Phase field model of fracture propagation and pressure evolution induced by fluid injection considering the effect of initial stress field in power generation test project of Gonghe Basin,ChinaOA
Hydraulic stimulation technology is widely employed to enhance the permeability of geothermal reservoirs.Nevertheless,accurately predicting hydraulic fracture propagation in complex geological conditions remains challenging,thereby hindering the effective utilization of existing natural fractures.In this study,a phase field model was developed utilizing the finite element method to examine the influence of fluid presence,stress conditions,and natural fractures on the initiation and propagation of hydraulic fractures.The model employs Biot''s poroelasticity theory to establish the coupling between the displacement field and the fluid field,while the phase field theory is applied to simulate fracture behavior.The results show that whenσ_(x0)/σ_(y0)<3 or qf<20 kg/(m^(3)·s),the presence of natural fractures can alter the original propagation direction of hydraulic fractures.Conversely,in the absence of these conditions,the propagation path of natural fractures is predominantly influenced by the initial stress field.Furthermore,based on the analysis of breakdown pressure and damage area,the optimal intersection angle between natural fractures and hydraulic fractures is determined to range from 45°to 60°.Finally,once a dominant channel forms,initiating and propagating hydraulic fractures in other directions becomes increasingly difficult,even in highly fractured areas.This method tackles the challenges of initiating and propagating hydraulic fractures in complex geological conditions,providing a theoretical basis for optimizing Enhanced Geothermal System(EGS)projects.
Hong-wei Wang;Hai-dong Wu;He-juan Liu;Yong-bo Tie;Li-sha Hu;Lin-you Zhang;Xian-peng Jin
Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Ministry of Natural Resources,Tianjin 300304,China Chinese Academy of Geological Sciences,Ministry of Natural Resources,Beijing 100037,China Faculty of Engineering,China University of Geosciences,Wuhan 430074,China Chengdu Center of China Geological Survey(Geosciences Innovation Center of Southwest China),Ministry of Natural Resources,Chengdu 610081,ChinaCenter for Hydrogeology and Environmental Geology Survey,China Geological Survey,Ministry of Natural Resources,Tianjin 300304,China Energy and Geoscience Institute,University of Utah,Salt Lake City,UT 84108,USAState Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China University of Chinese Academy of Sciences,Beijing 100049,ChinaChengdu Center of China Geological Survey(Geosciences Innovation Center of Southwest China),Ministry of Natural Resources,Chengdu 610081,China Technology innovation center for risk prevention and mitigation of geohazard,Ministry of Natural Resources Chengdu 611734,China Observation and Research Station of Chengdu Geological Hazards,Ministry of Natural Resources,Chengdu 610000,ChinaCenter for Hydrogeology and Environmental Geology Survey,China Geological Survey,Ministry of Natural Resources,Tianjin 300304,ChinaCenter for Hydrogeology and Environmental Geology Survey,China Geological Survey,Ministry of Natural Resources,Tianjin 300304,ChinaCenter for Hydrogeology and Environmental Geology Survey,China Geological Survey,Ministry of Natural Resources,Tianjin 300304,China
天文与地球科学
Hot dry rock permeabilityEnhance geothermal system(EGS)Hydraulic stimulationPhase field modelFracture propagationBreakdown pressurePower generation testClean energy geological survey engineering
《China Geology》 2026 (1)
P.25-43,19
supported by the National Key Research and Development Program(2021YFB150740401)National Natural Science Foundation of China(42202336)the CAS Pioneer Hundred Talents Program in China(Y826031C01)。
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