The purpose of casing

Casing that is cemented in place, aids the drilling process in several ways:

• Prevent contamination of fresh water well zones.
• Prevent unstable upper formations from caving-in and sticking the drill string or forming large caverns.
• Provides a strong upper foundation to use high-density drilling fluid to continue drilling deeper.
• Isolates different zones, that may have different pressures or fluids - known as zonal isolation, in the drilled formations from one another.
• Seals off high pressure zones from the surface, avoiding potential for ablowout
• Prevents fluid loss into or contamination of production zones.
• Provides a smooth internal bore for installing production equipment.                                           
  
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