Casing string

In drilling technology, casing string is a long section of connected oilfield pipes that is lowered into an wellbore and cemented in place. The purpose of the casing pipe is to:

  • Prevent the borehole from collapsing.
  • Prevent formation fluids from entering the borehole in an uncontrolled way (blow out).
  • Prevent fluids in the borehole (such as produced oil or gas, drilling mud, etc.) from entering other formations.
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