Borehole instability

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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