1. Department of Offshore Oil and Gas Engineering, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China
2. Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, P. R. China
3. Drilling Engineering Division, CNPC Offshore Engineering Company Limited, Tianjin 300280, P. R. China
4. Boxing Branch, CNPC Offshore Engineering Company Limited, Tianjin 300451, P. R. China