Affiliation: | ZHI Qingong(1,2),ZHAO Yizhong2,CHENG Yuanfang1,SUN Dexu2 and DU Peng2 1.College of Petroleum Engineering,China University of Petroleum,Qingdao 266580,Shandong,China; 2.Oil Production Research Institute,Shengli Oilfield,Dongying 257000,Shandong,China |