A consideration on the development of liner hanger technologies in China

China’s liner hanger technology is confronting new challenges during deep and ultra-deep well drilling. This paperreviews the development history of the technology and analyzes the present situation. In addition, this paper summarizes five typicalchallenges during deep and ultra-deep well drilling and points out six key problems in rotation, hydraulic release, high temperatureresistance, slip-bar protection, corrosion resistance and large bypass area, to be resolved during liner hanger research and development.Finally, this paper presents that emphasis be laid on the future development of multi-purpose combined liner hangers and expandableliner hangers.