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Open space between casing and rocks (no cement filling) |
Channels and fractures in cement, filling the space between casing and rocks |
Gaps between cement sheath and rocks due to poor cement-rocks bond |
Gaps between cement sheath and casing due to poor cement-casing bond |
Fissure network in rocks behind cement cement sheath |
Fig. 1. Example of Behind-Casing Cross-Flow captured by the temperature and noise logs (courtesy of TGT Oilfield Services) |
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