CO2 assisted steam flooding in late steam flooding in heavy oil reservoirs

XI Changfeng,QI Zongyao,ZHANG Yunjun,LIU Tong,SHEN Dehuang,MU Hetaer,DONG Hong,LI Xiuluan,JIANG Youwei,WANG Hongzhuang

Table 4 Predicted development effects of different development schemes.

Scheme Cumulative steam injection/104t Cumulative CO2 injection/104t Cumulative oil production/104 m3 Cumulative oil steam ratio Enhanced recovery/% Whole reservoir perforation steam flooding 112.06 0 3.92 0.035 4.7 Steam flooding after perforation adjusted 112.06 0 13.40 0.119 16.1 CO2-assisted steam flooding after perforation adjusted 112.06 2.67 16.68 0.160 21.5