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WELL COMPLETION (CASING (FUNCTIONS (To prevent contamination of near…

- - - - set in competent rocks to prevent caving of weak formation
    - - set in transition zone below/above an over-pressured zone
    - - installed from surface to some shallow depth
    - - represents the last casing string
    - - marine conductor
    - - does not reach surface
      - hung on the intermediate casing using a suitable arrangement of a packer&slips(liner hanger)
  - - - to prevent the wall of hole from caving in during drilling
      - to provide a means of extracting petroleum if the well is productive
      - to prevent seepage of fluids
- - - - to provide a protective sheath around the casing
      - to segregate producing formation
      - The cementing operation that takes place immediately after the casing has been run into hole
      - to prevent undesirable migration of fluids
    - - includes a plug-back job, in which a plug of cement is positioned at a specific point in the well
      - Wells are plugged to shut off bottom water
      - Any cementing operation after the primary cementing operation
    - - to cause seals at the points of squeeze
      - a secondary cementing method
      - The forcing of cement slurry by pressure to specified points in a well
      - used to isolate a producing formation, seal off water, repair casing leaks