1. College of Petroleum Engineering, Xi'an Shiyou University,Xi'an,Shaanxi,China
2. No.8 Oil Production Plant of Changqing Oilfield Branch of Petro China,Xi'an,Shaanxi,China
3. School of Petroleum Engineering and Environmental Engineering, Yan'an University,Yan'an,Shaanxi,China
4. College of Civil Engineering, Xijing University,Xi'an,Shaanxi,China