Highlights

  • ADX Energy has scheduled Phase 2 testing at the HOCH-1 gas discovery to begin on 15 December 2026.
  • Phase 1 testing recorded gas flow from multiple zones over short-duration test periods.
  • A coordinated Austrian workover programme is scheduled to start on 19 October 2026.
  • The planned work includes HOCH-1 recompletion and production-enhancement activities at the Gaiselberg and Zistersdorf fields.

ADX Energy Ltd (ASX:ADX) is an ASX-listed, Europe-focused oil and gas production and exploration company with operations in Austria and other European markets. Its 6 October 2026 update outlines the next testing phase for the HOCH-1 gas discovery and a coordinated Austrian workover programme for the final quarter of 2026.

HOCH-1 Moves to the Next Testing Phase

The HOCH-1 well is within the ADX-AT-I exploration licence in Upper Austria. ADX said it was drilled, cased and completed on 15 May 2026 and encountered up to eight biogenic gas reservoirs. The company operates the discovery and holds a 50 per cent economic interest.

Phase 2 testing is scheduled to begin on 15 December 2026. ADX plans to test Hall Channel reservoirs, with Test Zone 6 identified as the minimum interval. A workover rig will remove the existing completion, drill out the cement plug and reposition equipment before perforation. Deeper Hall Channel reservoirs may also be tested if appropriate.

What Phase 1 Testing Reported

During Phase 1, Zone 2 produced gas at a stable average rate of 2.7 million cubic feet per day (MMCFPD), equivalent to 450 barrels of oil equivalent per day (boepd), over 11 hours. ADX also reported a potential rate of 3.5 MMSCFPD from pressure build-up analysis.

A second flow period combined Zones 2, 3, 4 and 5 and averaged 3.15 MMCFPD, equivalent to 548 boepd, over 12 hours. Downhole gauges indicated contributions from three additional zones. These were short-duration tests, not established long-term production rates.

Vienna Basin Workover Programme

Alongside HOCH-1, ADX has scheduled a coordinated workover programme to begin on 19 October 2026 across its Austrian operations. The programme combines the HOCH-1 recompletion with planned work at the Gaiselberg and Zistersdorf fields in the Vienna Basin.

Planned activities include perforating gas zones, installing completions, replacing pumps, drilling out the HOCH-1 cement plug and recompleting the well. ADX expects the combined programme to add approximately 100 barrels of oil equivalent per day, or roughly 40 per cent, to Austrian output. This remains a company expectation.

Operational Milestones for the Remainder of 2026

Workover activities are scheduled to start on 19 October 2026, followed by Phase 2 HOCH-1 testing from 15 December 2026. Results from the recompletion and additional gas-zone testing will shape the next operational steps.

Key Insights

ADX Energy’s 2026 Austrian programme combines appraisal of the HOCH-1 gas discovery with work intended to enhance output from existing fields. The Phase 1 flow tests confirmed gas from multiple zones over short test periods, while Phase 2 is designed to examine additional Hall Channel reservoirs. The workover programme also links exploration and production activity within a single operating schedule, with the key outcomes dependent on execution and the results of the planned testing and recompletion work.