1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China e-mail:
2. CNPC Key Laboratory for Tubular Goods Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3. School of Material Science and Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China