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

Table 4

Comparison of production characteristics for model B.

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	3600	282400	70830	0.251	65	6.59
Infilled vertical injector	3658	302082	78178	0.259	71.7	7.15
Infilled horizontal injector between SAGD well pair	3808	292687	73255	0.250	67.2	6.44
Infilled horizontal producer between SAGD well pair	3154	291185	71101	0.244	65.2	7.55
Infilled horizontal injector above interlayer	3802	303674	77358	0.255	71	6.82
Infilled horizontal producer above interlayer	2663	301456	69447	0.230	63.7	8.73