Page 430 - Enhanced Oil Recovery in Shale and Tight Reservoirs

398 Enhanced Oil Recovery in Shale and Tight Reservoirs

Baseline (DI-Water) – Coreflood #4 1wt% Surf (Type-I) – Coreflood #5
Time (PVs) Time (PVs)
0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167 0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167
0.180 30
Dl-Water
0.175 1wt% Surf (Type-I) 1wt% Surf (Type-I)
25 Dl-Water
Water Saturation in Core 0.165 Pressure Drop (psi) 15
0.170
20
0.160
0.155
10
0.150
0.145 5
0.140 0
0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35
Time (hrs) Time (hrs)
Baseline (DI-Water) – Coreflood #6 1wt% Surf (Type-II) – Coreflood #7
Time (PVs) Time (PVs)
0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167 0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167
0.180 30
Dl-Water 25 1wt% Surf (Type-II)
Water Saturation in Core 0.175 Pressure Drop (psi) 20
1wt% Surf (Type-II)
Dl-Water
0.170
0.165
15
0.160
0.155
10
0.150
5
0.145
0.140 0
0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35
Time (hrs) Time (hrs)
Baseline (DI-Water) – Coreflood #1 1wt% Surf (Type-III) – Coreflood #3
Time (PVs) Time (PVs)
0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167 0.000 0.167 0.333 0.500 0.667 0.833 1.000 1.167
0.180 30
Dl-Water
1wt% Surf (Type-III)
0.175 1wt% Surf (Type-III)
25 Dl-Water
Water Saturation in Core 0.165 Pressure Drop (psi) 15
0.170
20
0.160
0.155
10
0.150
0.145 5
0.140 0
0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35
Time (hrs) Time (hrs)
Figure 12.55 Comparison of changes of overall water saturations and the pressure
drop across the core during flow back and hydrocarbon production among DI water
and various surfactant cases (Liang et al., 2017a).