Chemical fluid component and Injection Strategy
After finalizing well pattern and rock-fluid parameters, injection
parameters were set in the simulator. Initially, the secondary
water-flood injection stage continued for a period of 0.1444 days (208
min) at a flow rate of 0.00024 m3/day. This was
followed by chemical flood injection, in which
surfactant/polymer/nanoparticle based aqueous fluids were injected at
the same rate to recover additional oil trapped within pore-throat
regions. This process continued for 86 min duration until cumulative
period of 0.2041 day. Finally, chase water was injected during
0.2041-0.3083 day period (~150 min) to maintain pressure
gradient. Earlier researchers developed simulation models using
CMG-STARS and CMOST for core-scale flooding studies [61-63]. This is
advantageous in understanding reservoir and fluid properties, and
accurately simulate enhanced flooding performance parameters
[62,63]. Table 4 shows the flooding model comparisons for different
injection schemes employed during displacement experiments.