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Table 1 OOGP decommissioning options and the methods

From: A semi-automated approach to generate 4D/5D BIM models for evaluating different offshore oil and gas platform decommissioning options

  RIG-TO-REEF REMOVAL-TO-SHORE
Topsides T1:
Reverse Installation
T2:
Single Lift
T1:
Reverse Installation
T2:
Single Lift
Jacket J1:
Topple in Place for Reef
J2:
Single Lift
J3:
Offshore Deconstruction
  1. Reverse Installation (T1): Remove the platform following the reverse process of installation
  2. Single Lift (T2 or J2): Remove the topsides or jacket by only one lift with the help of huge lift vessel
  3. Offshore Deconstruction (J3): Cut the jacket into sections with ROV and lift onto barge before shipping to land
  4. Topple in Place for Reef (J1): Topple the whole jacket in the current place for the artificial reef program