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Specific type of Downhole cross-flow occurring behind the casing through:
| open Open space between casing and rocks |
| channels Channels and fractures in cement, filling the space between casing and rocks |
| gaps Gaps between cement and rocks due to poor cement-rocks bond |
| gaps Gaps between cement and casing due to poor cement-casing bond |
fissure Fissure network in rocks behind cement |
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