A Bottomhole Drillability Model in Spherical Symmetric Coordinates
SHI Xiangchao1*, TAO Zuwen1，2, MENG Yingfeng1, ZHAO Xiangyang1，3, TAO Yun4
西南石油大学学报(自然科学版) . 2016, (4): 130 -135 .  DOI: 10.11885/j.issn.1674-5086.2014.09.03.05