1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China
2. Key Laboratory of Petroleum Tubular Goods and Equipment Ouality Safety for State Market Regulation, Xi’an 710077, China
3. Research Institute of drilling and Production Technology of Qinghai Oilfield, Dunhuang 736202, China
4. Oil and Gas Engineering Research Institute of Petro China Changqing Oilfield Company, Xi’an 710077, China
5. The No.4 Production Plant, Qinghai Oilfield, Mangya 816400, China