Stability analysis of seabed strata and casing structure during the natural gas hydrates exploitation by depressurization in horizontal wells in South China Sea oleh Peng-fei Xie, Lin Yang, Qian-yong Liang, Xu-hui Zhang, Liang-hua Zhang, Bin Zhang, Xiao-bing Lu, Hui-ce He, Xue-min Wu, Yi-fei Dong