1. Institute of Safety Assessment and Integrity, State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Tubular Goods Research Center of CNPC, Xi’an 710077, China
2. No. 10 Oil Production Plant of PCOC, Jiayuguan 745000, Gansu, China
3. PetroChina Coalbed Methane Company Limited, Beijing 100028, China
4. Southwest Gas Production Plant of PetroChina Zhejiang Oilfield Company, Yibin 645250, Sichuan, China