文献类型：期刊文献

英文题名：Effect of clay type and content on the mechanical properties of clayey silt hydrate sediments

作者：Tang, Qiongqiong[1];Chen, Yuanbo[1];Jia, Rui[2];Guo, Wei[2];Chen, Weiqiang[3];Li, Xiaoshuang[1];Gao, Huicai[1];Zhou, Yu[1]

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

年份：2023

卷号：220

外文期刊名：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000891781900001)、、EI(收录号：20224713140082)、Scopus(收录号：2-s2.0-85141976275)、WOS

基金：This study was supported by Major projects of Natural Science Foundation of China (Grant No. 51890914), China Postdoctoral Science Foundation (2022M71105), Shaoxing University Project (2021LG005) and College Students' Innovative Entrepreneurial Training Plan Program of Jilin University (202010183156). 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. Thank Dr. Yuan Wang and researcher Shengli Li for their help, so that the first author can complete her study during her doctor's period.

语种：英文

外文关键词：Clay type; Clay content; Hydrate -bearing sediments; Strength and deformation

外文摘要：Knowledge of the mechanical properties of natural gas hydrate reservoirs is fundamental to the safe and com-mercial extraction of natural gas hydrate. In our work, according to the characteristics of marine sediments in the South China Sea, gas hydrate samples with matrices containing 0%, 10%, 20%, and 30% montmorillonite or illite were prepared based on the saturated gas method. Under effective confining pressures of 2, 3 and 4 MPa, drained compression tests were performed on the samples. The results show that the clay type and clay content affect the failure strength and deformation of clayey silt hydrate sediments. The presence of clay causes the clayey silt hydrate samples to exhibit strain hardening behavior accompanied by shear shrinkage, and the failure strength and stiffness decrease with increasing clay content, as does the internal friction angle. The strength, stiffness, and Poisson's ratio of samples containing illite are generally greater than those containing montmorillonite. In addition, due to the strong bound water between particles, the cohesion of hydrate samples containing mont-morillonite with similar hydrate saturations is higher than that of samples containing illite, while the internal friction angle is lower. These results are valuable for production well siting assessment in clayey silt hydrate reservoir and provide requisite theoretical basis for wellbore safety design.