Negative Other LL with DNO

Oselvar (A-1 H, A-2 H, A-3 HT2) – P&A

PSA Finding

• Not significant, but PSA raised the question whether one double barrier was sufficient despite identifying more zones with the potential of flowing.
• Though not registered as a deviation, Statoil had a somewhat lacking understanding of the ALARP principle, which means that a company must reason in detail why a certain method/solution is not implemented, in this case using 1 plug instead of 2.

PSA Comments

Risk: • 1 double barrier was utilized to save time, despite identifying multiple zones with flow potential.
Comment:
• Statoil could prove through simulations and suspected flow paths that 1 double barrier was sufficient.
• A thorough risk analysis was performed and accepted with regards to the use of 1 double barrier.