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Illustrative Example 3.1 (Continued )

Hole Drill Casing Casing Mud Mud
Size Pipe OD Depth Size Weight Viscosity

24" 6 5 /8" 120' 20", 94 Ib/ft 9.2 ppg 20 cp
(610mm) (168mm) (37 m) (508 mm, 140 kg/m) (1.10 SG) (0.020 Pa-s)
1400'
3
5
1
17 /2" 6 /8" (427m) 13 /8", 48 Ib/ft 9.6 ppg 15 cp
(445mm) (168mm) 7000' (339.7mm, 71.4kg/m) (1.15 SG) (0.015 Pa-s)
(2134 m)
12 1 /4" 5" 8 5 /8", 32 Ib/ft 10.4 ppg 10 cp
(318mm) (127mm) (219.1mm, 47.6kg/m) (1.25 SG) (0.01 Pa-s)
7
7 /8" 5"
(200mm) (127mm)
10000' 11 ppg 5cp
(3048 m) (1.38 SG) (0.005 Pa-s)

7 7 /8"
(200 mm)

Figure 3.2 Example of borehole geometry with extreme mud properties.