The decommissioning campaign in question was executed at the North-West Shelf, offshore Western Australia.
The initial screening process had verified that annular cement was in place across the cap rock and so all lower abandonment options requiring removal of casing were discounted. However, the three alternative abandonment options remained:
- Bullhead cement
- Placement of a balanced cement plug thru-tubing using coiled tubing
- Placement of a balanced cement plug on drill pipe after removal of the upper completion
These methods were taken forward for detailed, probabilistic assessment applying the Monte Carlo probabilistic simulation functionality of our P1™ application.
Click here to read the full in-depth technical #usecase of the decommissioning project in Australia.