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Experimental research on sweep efficiency and displacement efficiency of ASP flooding

LIU Chun-lin1,2,YANG Qing-yan1,2,LI Bin-hui2,LAN Yu-bo2 (1.China University of Geosciences,Beijing 100083;2.Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,China)  
In order to understand mechanism of ASP flooding,the dynamic characteristics of sweep efficiency and displacement efficiency in ASP flooding process is studied through three-dimensional physical simulation,and contribution degree of displacement efficiency and sweep efficiency of different reservoirs in ASP flooding to enhancing oil recovery is also given quantitatively.Results show that,with barrier existing,the contribution of medium permeable reservoirs is up to 25.29%,secondly,contribution of low permeable reservoirs is up to 44.31%,and contribution of high permeable reservoirs is up to 30.40%.Analysis shows that the key role of ASP flooding is dominant on improving sweep efficiency,especially for that of high permeable layer,and can increase sweep efficiency of low and medium permeable layer.Contribution generated from displacement oil to enhance oil recovery is obtained,which is 33.27%,and sweep efficiency contribution is 66.73%.
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