1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P.R. China
2. Engineering Technology Operation Center, CNOOC LTd.-Tianjin, Tianjin, P.R. China
3. Project Department, China Nanhai--Magcobar Mud Corporation, Ltd., Shenzhen, Guangdong, P.R. China