Borehole instability is the undesirable condition of an openhole interval that does not maintain its gauge size and shape and/or its structural integrity
Causes
- Mechanical failure caused by in-situ stresses
- Erosion caused by fluid circulation
- Chemical caused by interaction of borehole fluid with the formation
Types and associated problems
- Hole closure or narrowing
- Hole enlargement or washouts
- Fracturing
- Collapse
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