Table 1. Casing size options.
 
OD casing
(in.)
Open hole
(bit size)
(in.)
OD casing
coupling
(in.)
Weight
(lb/ft)
ID
(nominal)
(in.)
Drift
(in.)
Cemented? TD
range
(m)
20 24 21 94.0 19.124 18.936 No 40–80
16 20 17 75.0 15.124 14.936 Cemented below
20 in. casing

40–80
or
200–500

13 17 14 54.5 12.615 12.456 Yes 300–700
10 14 10 40.5 10.050 9.894 Yes 500–1500

Note: Recommended casing configurations to avoid running an underreamer to create the open hole for the casing are 16:10 in. and 20:13 in.