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Surface casing (Supporting structure (Sea Deck/ splashzone (Centralizer…

- - - - Fin plate
      - Rubber diaphragm
      - None
    - - Framing type
      - Cantilever type (monobore only)
    - - Composite wrap
        
        Helicoid
        
        Belzona
      - Pipe sleeve
        
        Weld
        
        Bolting
      - Hanging frame (to prevent dropped object)
    - - Scab casing, To secure prior to pulling up 9-5/8" casing
  - - - Fin plate (used when infilled well is much smaller than original)
        potentially stuck if guide bucket does not have bottom cone
      - Rubber diaphragm
      - None
      - Clamp/ wedge installed by diver
        potentially stuck if guide bucket does not have bottom cone
    - - Framing type
      - Cantilever type (monobore only)
      - Wedge/ clamp installed by diver
    - - Top & Bottom cone shape
      - Top cone shape only
        Potentially stuck
  - - - Added slot
        
        Straight well
        
        Unable to self stand in any condition
        Decreasing CD beam capacity**
        
        Self standing under in-service condition
        
        Curved well
        
        Self standing under in-service condition
        
        Unable to self stand in any condition
        Decreasing CD beam capacity**
        
        Require Transfer beams to support BOP/hung loads
      - Original slot location
        
        Infilled project
        
        Unable to self stand in any condition
        Decreasing CD beam capacity**
        
        Self standing under in-service condition
        
        Original well design
        
        Self standing under in-service condition
    - - Weak capacity**
- - - - Single well inside
      - Straight conductor OD >= 20"
      - Self standing (considered as pile)
    - - multi wells inside
      - Infilled slot
        
        Mouth hole location
        
        Above mudline
        
        Below or at mudline
        
        Potential stuck **
        
        Vertical load transferring
        
        hanging on sub cellar deck
        
        recommend to retrieve as 1st slot **
        
        Self standing (sit on existing stump)
      - Straight OD >= 26"
    - - Objective
        
        to prevent VIV
        
        Curved casing
      - geometry
        
        Straight scab - OD 13-3/8", 20", 26"
        
        curved scab - 13-3/8"
      - Vertical load transferring
        
        Support shall be secured prior to
        retrieving internal casing **
        
        hanging on +10' or sub cellar deck
  - - - 3-string
        
        OD 9-5/8"
      - 4-string
        
        OD 13-3/8"