Study on wellbore instability mechanism and drilling fluid optimization of Yingsha block in southwest Tarim BasinYong Sheng, Yan Ye, Zhishi Zhou, Guangxu Zhou, Wei Luo, Lingling Ren and Hanxuan SongE3S Web Conf., 252 (2021) 03045DOI: https://doi.org/10.1051/e3sconf/202125203045