Effect of perforation shear on viscosity of polymer solution Xi Yan, Xiaoyan Wang, Wei Wang, Zeyu Lin, Guangyu Yuan, Nan Zhan, Song Han, Xidong Cai, Xing Wu and Yanbin Liang E3S Web Conf., 375 (2023) 01042 Published online: 27 March 2023 DOI: 10.1051/e3sconf/202337501042