CBL Interpretation Chart [PDF]

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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