文献类型：期刊文献

英文题名：Impact of Clay on the Decompositional Mechanical Properties of Clayey Silt Hydrate Sediments

作者：Tang, Qiongqiong[1];Sun, Chengqi[1];Chen, Yuanbo[1];Guo, Wei[2];Jia, Rui[2];Gao, Huicai[1];Zhou, Yu[1];Chen, Weiqiang[3];Han, Guansheng[1];Xu, Xiangyang[4]

机构：[1]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China;[2]Jilin Univ, Coll Construct Engn, Changchun 130021, Peoples R China;[3]Univ Manchester, Sch Engn, Dept Mech Aerosp & Civil Engn, Manchester M13 9PL, England;[4]Soochow Univ, Sch Rail Transportat, Suzhou 215031, Peoples R China

年份：2024

卷号：38

期号：8

起止页码：6834

外文期刊名：ENERGY & FUELS

收录：SCI-EXPANDED(收录号：WOS:001200648500001)、、EI(收录号：20241515900723)、Scopus(收录号：2-s2.0-85189901238)、WOS

基金：This study was supported by China Postdoctoral Science Foundation (2022M71105), Major projects of the Natural Science Foundation of China (Grant No. 51890914), the National Natural Science Foundation of China (Grant No. 42302353 and 52308323), the Natural Science Foundation of Jiangsu Province (Grant No. BK20220502), and Shaoxing University Project (Grant No. 2021LG005). Also, thanks for the experimental conditions provided by the Key Laboratory of Drilling and Production Technology under Complex Conditions of the Ministry of Natural Resources and the training of the School of Construction Engineering of Jilin University.

语种：英文

外文关键词：Clay minerals - Gas hydrates - Gases - Hydration - Silt - Strain hardening - Stress-strain curves

外文摘要：For sustainable and safe gas production, it is crucial to correctly understand the mechanical properties of clayey silt hydrate reservoirs. To investigate the impact of clay on the decompositional mechanical behavior of clayey silt hydrate sediments during gas production, artificial hydrate samples with illite or montmorillonite were first prepared according to the survey data in the South China Sea. Then, depressurized decomposition was used to simulate the real gas production process. Finally, axial loads at different confining pressures were applied to samples with different residual hydrate saturations in multistage triaxial tests. Results show that clays considerably impact the decompositional mechanical properties of clayey silt hydrate sediments. Although both sediment types exhibit strain hardening and shear shrinkage during gas production, illite-containing clayey silt hydrate samples have a lower stiffness to resist deformation but a higher strength to resist failure than montmorillonite-containing clayey silt hydrate samples at similar residual hydrate saturations. The stress-strain curves of completely decomposed montmorillonite-containing clayey silt hydrate samples almost coincide with those of hydrate-free samples, while those of completely decomposed iIllite-containing samples are slightly higher than those of hydrate-free samples. Furthermore, a modified Mohr-Coulomb strength criterion was established for clayey silt hydrate sediments with different clays during hydrate dissociation. This study guides the future commercial extraction of hydrates from clayey silt reservoirs.