Application Research on Liner Tube without Variable Diameter of Shale Gas Plunger Gas Lift WellheadChengzhi Duan, Haonan Xu, Jing Fan, Lujun Wen and Jianhui NiE3S Web Conf., 375 (2023) 01005DOI: https://doi.org/10.1051/e3sconf/202337501005