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Through-Pipe Evaluation
Schlumberger
CBL Interpretation Chart
M-1
Casing size (mm)
Centered tool only, 3-ft [0.914-m] spacing
194 140 176
115
273 340 dB/m 1
70
Compressive strength (psi) (mPa)
4
2 50
8
40
3
30
4
12
30
20
5
15
6
20
10 9 8 7 6
7
25
24
0.5
28
4 10
0.4
10
9 32
15 2000
lbm 7 in. 29
8
5
3000 20
Casing thickness (mm) (in.) 0.6 15
10 8 0.3 7
3
1000
1000
11 36 6
2
12
800
40 5
0.2
13
5
14 48 15 0.5
16 52 17 56
Foamed cement
44
1
7 51⁄2
133⁄8 103⁄4
dB/ft
500 3
4 2 250
500 3
1 100 300
0.5 2
M 50
18
0.2 41⁄2
5
6
Standard cement
CBL amplitude (mV)
4000 16
0.3 200
75⁄8
1
Casing size (in.) 100 © Schlumberger
See opposite page for instructions.
7-19