Temperature-driven hydrate dissociation in pressure-preserved coring:A fully coupled modeling study with burst-decay kineticsOA
Natural gas hydrate(NGH)extreme thermodynamic sensitivity poses challenges for pressure-preserved coring operations in reservoir evaluation and commercial development.Current preservation strategies employing“pressure-only”approaches fail to address temperature-induced instability,leading to sample degradation and compromised geological characterization.This study investigates temperature-pressure synergistic preservation mechanisms using fully coupled thermal-hydraulic-mechanical-chemical(THMC)numerical simulation of hydrate cores from the Shenhu area,South China Sea.Numerical modeling incorporating hydrate dissociation kinetics,multiphase fluid dynamics,and heat/mass transfer processes reveals that temperature variations trigger cascading destabilization mechanisms.Results demonstrate that temperature field evolution follows exponential growth patterns,generating steep radial gradients up to 35 K/cm that induce pressure surges from 0.11 MPa to 0.82 MPa,establishing positive feedback loops destabilizing hydrate structures.Hydrate dissociation kinetics conform to Kim-Bishnoi laws,exhibiting“S-shaped decay”patterns with 2 times rate acceleration under elevated temperatures,reducing dissociation completion times from 1200 s to 600 s.The investigation identifies“threshold effects”in relative permeability evolution,where growth exceeding three orders of magnitude occurs when hydrate saturation drops below 0.15-0.2,transforming core hydraulic properties.Multiphase fluid migration transitions from diffusive regimes(0-0.4×10^(-3) m/s)to explosive patterns(1×10^(-3)-1.25×10^(-3) m/s),exhibiting“burst-decay”kinetics that compromise sample integrity through rapid methane release and pore structure reconstruction.The study establishes quantitative criteria for developing temperaturepressure synergistic preservation technologies,with numerical results indicating potential sample quality loss reduction of 60%-80%.
Meng Xu;Ya-chen Xie;Le Zhao;Ling Chen;Chao Yuan;Jia-liang Chen;Cheng-hang Fu;Han Wu;Gui-kang Liu;Ming-zhu Qi;Ming Zhang;He-ping Xie
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China School of Mechanical Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China School of Mechanical Engineering,Sichuan University,Chengdu 610065,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,ChinaShenzhen Geotechnical Investigation&Surveying Institute(Group)Company Limited,Shenzhen 518028,ChinaShenzhen Geological Science and Technology Innovation Center,Shenzhen 518028,ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China School of Mechanical Engineering,Sichuan University,Chengdu 610065,China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China
能源科技
Natural gas hydrateCombustible iceUnconventional energyClean energyTemperature-pressure synergistic preservationMultiphysics couplingPressure-preserved coringHydrate dissociation kineticsNumerical simulationS-shaped decay
《China Geology》 2026 (3)
P.535-552,I0028-I0033,24
financially supported by Shenzhen Science and Technology Program(KJZD20231025152759002,JSGG20220831105002005)the support provided by the National Natural Science Fund Foundation of China(52374357,523B2101)。
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