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A wellbore is the hole that is drilled to help find and recover material from a well, and becomes the actual well hole.[1]


Wellbores may be encased or open, and safety can be a major concern depending on where it occurs. Unstable wellbores are linked to complex geological structures and certain areas underground.[2]

Types of wellbore

The major types of wellbore include:[3]

  • Vertical wellbores
  • Horizontal wellbores
  • Complex wellbores (which deviate in multiple directions as they move underground)

See also