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Cementing Evaluation Logging (SCMT) Emerson Rodrigues BRZ Well Integrity Domain Champion Schlumberger
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Cementing Evaluation Logging (SCMT)
Emerson Rodrigues
BRZ Well Integrity Domain Champion
Schlumberger
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3/28/2014
CBL - Tools & Physical principles
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3/28/2014
CBL - example
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3/28/2014
CBL – quantitative interpretation
Bond Index (BI):
CBL amplitude at interest zone [mVolt]
CBL amplitude at cement section [mVolt]
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3/28/2014
- VDL records the complete signal from the receiver (5ft).
- The detected wave is represented in a qualitative way during
a period of 1 ms (200 a 1200 µs).
VDL - Tools & Physical principles
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3/28/2014
SCMT - Tools & Physical principles
- 3 ft receiver (CBL)
- 5 ft receiver (VDL)
- 2 ft receiver directional: 8 sensors are used to
generate a cement map (qualitative cement
distribution).
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3/28/2014
SCMT - Slim Cement Mapping Tool
Toolstring
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3/28/2014
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3/28/2014
SCMT log
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3/28/2014
SCMT log
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3/28/2014
SCMT log SCMT log inside a 5.5” 17 lb/ft liner with water and cemented with a regular class g cement.
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3/28/2014
SCMT log SCMT log inside a 5.5” 17 lb/ft liner with water and cemented with a regular class g cement.
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3/28/2014
SCMT log SCMT log inside a 4.5” liner cemented with a regular class g cement across a swellable packer, the CBL (Blue Solid curve
Track 2) response across the swellable packer indicating Poor bond (~ 80mv) which agrees with the MAP receivers, the pop
joint above and below the packer seem to have a reasonable bond. A swellable packer is basically a layer of rubber coating the
external side of the casing. When swollen, it can be considered – from an acoustic point of view – as a medium with properties
in between rubber and solvent (water or oil). In any case, the contrast of acoustic impedance between the swellable packer
(swollen or unswollen) and the casing-cement will be very high. Thus, it is expected the material to behave as a liquid: the log
below is consistent with this view. High CBL is expected across any swellable packer, due to low attenuation (low shear
velocity, low density).
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3/28/2014
SCMT log
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3/28/2014
SCMT log
