1. Gathering and Transmission Technology Research Institute of PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610041, China
2. Gas Transportation Management Division of PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610213, China
3. School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China