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188 Part III Underbalanced Drilling Systems

Illustrative Example 9.2 (Continued )
Foam Quality Index
0.00 0.20 0.40 0.60 0.80 1.00 1.20
0
1000

2000
3000
Depth (ft) 4000
5000

6000
7000
Annular profile
8000
In-pipe profile
9000
Figure 9.9 Calculated foam quality profile along the flow path.

3
Mixture Density (Ib/ft )
0 10 20 30 40 50 60
0
1000
2000
3000
Depth (ft) 4000

5000
6000
7000
Annular profile
8000
In-pipe profile
9000
Figure 9.10 Calculated density profile along the flow path.