Page 232 - Fundamentals of Enhanced Oil and Gas Recovery

220 Mohammad Ali Ahmadi

The pilot-scale analysis was further evaluated to estimate the likely recovery factor
for both the linear and radial system based on water saturation. Fig. 7.8 shows the
average saturation behind the fluid front determined by the intersection between the
tangent line and f w 5 1.
Hence, at the water breakthrough, the oil recovery factor can be estimated by the
expression

30
Radial
Linear
25
Waterfront location (ft) 20

15

10

5

0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Waterflooding time (days)
Figure 7.7 Plot of waterfront location and waterflooding time.

1.1
1
0.9
0.8
0.7
Water cut 0.6 Fw (linear)
0.5
0.4 Fw (radial)
0.3
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1 1.2
Water saturation
Figure 7.8 Average water saturation for both linear and radial systems.