Research on Prediction Methods of Wellbore Hydrate Formation of Ultra-Deep Gas Wells in Northwest SichuanQilin Liu, Jian Yang, Lang Du, Jianxun Jiang, Dan Ni, Rong Zheng, Zhaoqian Luo and Peng LiuE3S Web Conf., 329 (2021) 01076DOI: https://doi.org/10.1051/e3sconf/202132901076