CNPC's Baoshi Pipe successfully deployed its self-developed BJC-FJ threaded casing in Xinjiang's first 5,500m "casing-in-casing" test well. This breakthrough enables China to master high-end casing tech for aging well reconstruction. Over 38 hours, technicians installed 2,000m of casing under extreme conditions, achieving all technical targets after cementing. The innovation addresses low-yield well challenges in unconventional oil/gas extraction. (Photo/ China Youth Daily)

By Wang Xinyuan,Li Yuanyuan,Jiang Xinyi(intern) and Li Zi‘ang/China Youth Daily