Numerical simulation of steam plus flue gas injection in heavy oil reservoir

In order to improve development effect of cyclic steam stimulation in late period and steam drive for extra heavy oil in Jiu 6 block of Karamay oilfield, studies have been carried out for mechanism of steam plus flue gas injection, sensitivity of geological parameters, optimization of injection - production parameters, and economic evaluation. The results of these studies show that under suitable reservoir conditions , the effectiveness of cyclic steam plus flue gas stimulation and steam plus flue gas drive have shown distinct improvement than that of straight cyclic steam stimulation and steam drive. By adding flue gas in the late period of cyclic steam stimulation, the number of cycles may increase 24, single well production increase 1 459 t, and the recovery percent of reserves improve 7 .02 % ; if adding flue gas during steam drive, the recovery percent of reserves may increase 3.7%.