1. Design and experimental study on a novel sealing structure of rotary control head for coalbed methane underbalanced drilling. (September 2022) Authors: Liu, Yang; Qian, Liqin; Xia, Chengyu; Yi, Xianzhong Journal: Engineering failure analysis Issue: Volume 139(2022) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗