1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
2. National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Qingdao, Shandong 266580, China
3. Hainan Branch, CNOOC China Limited, Haikou, Hainan 570100, China
4. Drilling Division, CNPC Offshore Engineering Co., Ltd., Tianjin 300451, China