Casing Inspection - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 223

complete inspection for wall thickness and splits in one run of the cable in the well.
Examples of a tubing profi le and a split-detector log are shown in Fig. 13.2 .

Table 13.1 Caliper sizes
Tool diameter (in.) Number of feelers Casing or tubing OD (in.)

Casing-profi le calipers
3 5/8 40 4 1/2 to 6

5 5/8 64 6 5/8 to 7 5/8

7 1/4 64 8 5/8 to 9

7 3/4 64 9 5/8

8 1/4 64 10 3/4

9 9/16 64 11 3/4

11 5/16 64 13 1/8

13 5/8 64 13 1/8

13 5/8 64 16

17 5/8 64 20

Tubing-profi le calipers
1 1/2 20 2

1 1/2 20 2 1/16

1 3/4 26 2 3/8

2 3/16 32 2 7/8

2 11/16 44 3 1/2

3 1/32 44 4

Casing Profiles

Casing-profi le calipers are available to log 4½ through 20-in. OD casing. These
tools are especially valuable where drilling operations have been carried on for an
extended period of time through a string of casing. The determination of casing
wear is of great importance when deciding if a liner can be safely hung, or if a full
production string is required. In producing wells, the casing-profi le caliper will
locate holes or areas of corrosion that may require remedial work.

Fig. 13.2 Tubing-profi le and split-detector logs. Courtesy DIA-LOG Company