Simulation and Production Optimization on Enhanced Oil Recovery during the Middle and Late Period for SAGD Development in Ultraheavy Oil Reservoirs with Interlayers

Table 5

Comparison of production characteristics for model C.

Scheme	Time (d)	Cumulative steam injection (10^4 t)	Cumulative oil production (10^4 t)	Cumulative oil to steam ratio (cOSR) (f)	Oil recovery factor (%)	Oil recovery ratio (%)
Conventional SAGD	3494	216993	52728	0.243	48.4	5.06
Infilled vertical injector	4480	278275	67438	0.242	61.9	5.04
Infilled horizontal injector between SAGD well pair	3395	224424	56165	0.250	51.5	5.54
Infilled horizontal producer between SAGD well pair	3246	217024	54072	0.249	49.7	5.59
Infilled horizontal injector above interlayer	3601	262094	65359	0.249	60	6.08
Infilled horizontal producer above interlayer	2471	261223	57496	0.220	52.7	7.78