Eni Energy Bonaparte Pty Ltd is the titleholder of the Petrel gas field in the Bonaparte Basin in northern Western Australia. The Petrel field is located in permits NT/RL1 and WA-6-R, in water depths of ~95m.

The activity applies to two wells within NT/RL1 (Petrel-3 and Petrel-4) which were suspended in the 1980s.

The defined petroleum activity for the Petrel-3 and Petrel-4 Monitoring and Decommissioning EP (the petroleum activities) will be limited to:
- Annual general visual inspections (GVI) as part of the in-force Well Operations Management Plan (WOMP) until permanent Petrel-3 and Petrel-4 plug and abandonment (P&A). The current in-force WOMP will be updated in 2025 to include P&A activities, following the pre-decommissioning inspection
- A geophysical and geotechnical survey campaign
- A pre-decommissioning inspection to prepare the wells for decommissioning and inform wellhead removal methodology
- The decommissioning campaign, to permanently seal and abandon the Petrel-3 and Petrel-4 wells and retrieve subsea equipment at or below the mudline
- In the event that all reasonable attempts to remove and recover the wellheads and associated equipment are unsuccessful, a contingency activity to leave in-situ any property that could not be removed has been included, and
- A post-decommissioning seabed survey.