A New Dynamic Analysis Method for Hang’s Mudding-Off Technique based on Circulation Loss in ReturnHong Liu, Pu Liu, Feng-ling Xu, Qiao Chen, Hong-ling Zhu and De-gui SuE3S Web Conf., 143 (2020) 02049DOI: https://doi.org/10.1051/e3sconf/202014302049