Amplitude Energy has completed its Annie-2 development well offshore Victoria, Australia, with flow testing recording an average stabilised gas rate of 57.2 million standard cubic feet per day (MMscf/day) as part of the East Coast Supply Project (ECSP).
The well reached a peak surface-constrained flow rate of 58.8 MMscf/day during clean-up testing on 9–10 November 2026. According to the company’s 11 November announcement, the peak rate was limited by surface testing equipment rather than the well’s deliverability.
The main flow period lasted approximately eight hours and 20 minutes. No formation water was recovered during testing.
Annie-2 encountered 50 metres of gross pay, including 43.6 metres of net pay, within the Waarre C reservoir sands. Preliminary data indicate higher permeability, porosity and potential deliverability than those identified in the original Annie discovery in 2019.
Gas composition samples were consistent with the earlier discovery, with carbon dioxide content of approximately 7 mol%.
The well was drilled using Transocean‘s semi-submersible rig Transocean Equinox, reaching a total measured depth of 2,253 metres on 28 October 2026. It has since been cased and completed with a subsea tree and is being suspended in preparation for future development.
Annie-2 is located in permit VIC/L37 in Australian Commonwealth waters, approximately 10 kilometres north of its planned connection to the existing Casino Henry Netherby (CHN) pipeline.
Amplitude Energy holds a 50% interest in the permit, with O.G. Energy owning the remaining 50%.
The company previously reported gross 2C contingent resources of 65 petajoules for Annie, equivalent to 32.4 petajoules net to its interest. These figures predate the latest drilling results. No revised reserves or contingent resource estimate was announced in the 11 November update.
Interpretation of the Annie-2 results is continuing, while updated reserve assessments for Annie and Juliet are expected over the coming weeks.
Amplitude Energy said the Annie-2 programme was progressing ahead of schedule and below budget. None of the general contingency allocated to the ECSP drilling campaign had been used as of the announcement.
The company reached a final investment decision for the ECSP development phase on 30 September 2026, alongside approval to proceed with drilling the Nestor exploration prospect.
Operations at Annie-2 were expected to conclude during the week of 11 November. Transocean Equinox will then move to Nestor to drill the final well in the ECSP campaign.
