宋永臣

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:能源与动力学院

学科:能源与环境工程

办公地点:能动大楼810

联系方式:songyc@dlut.edu.cn

电子邮箱:songyc@dlut.edu.cn

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Comparative analysis of the consolidation and shear behaviors of CH4 and CO2 hydrate-bearing silty sediments

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论文类型:期刊论文

发表时间:2020-03-01

发表刊物:JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING

收录刊物:EI、SCIE

卷号:75

ISSN号:1875-5100

关键字:Gas hydrate; Silty sediment; CH4-CO2 replacement; Consolidation behavior; Strength; Contraction behavior

摘要:The successful production trial in Ignik Sikumi located in Alaska North Slope showed the significant potential of applying the CH4-CO2 replacement method to natural hydrate production. The comparison on the mechanical behaviors of CH4 and CO2 hydrate-bearing sediments is the key factor in assessing the geomechanical stability of hydrate reservoirs before and after the CH4-CO2 replacement. Large amount of hydrates have been discovered in silty reservoirs. However, studies focusing on the mechanical behaviors of CH4 and CO2 hydrate-bearing silty sediments are rare to date. This paper reports the results of a comparative analysis of the mechanical behaviors, including the isotropic consolidation behaviors and stress-strain relationships of CH4 and CO2 hydrate-bearing silty sediments. The results show that the CH4 and CO2 hydrate-bearing silty sediments present similar compression and swelling indexes. Various hydrate saturation shows differential effects on the strength and stiffness of CH4 and CO2 hydrate-bearing silty sediments. In addition, CO2 hydrate-bearing silty sediments displays weaker contraction behaviors than that of CH4 hydrate-bearing silty sediments.