How ADX Energy (ASX:ADX) plans to combine HOCH-1 gas testing with Vienna Basin well work

Sonal Goyal

06 October 2026 05:34 PM AEDT

How ADX Energy (ASX:ADX) plans to combine HOCH-1 gas testing with Vienna Basin well work

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ADX Energy Ltd (ASX:ADX) has outlined a combined well programme in Austria that pairs further flow testing of its HOCH-1 gas well with production enhancement work at its Vienna Basin oil and gas fields, according to an announcement released on 6 October 2026.

The company said a contracted workover rig will begin the programme on 19 October 2026. The Vienna Basin well work is expected to add approximately 100 barrels of oil equivalent per day (BOEPD), which ADX said represents an approximate 40% increase in its Austrian production. Phase 2 flow testing at HOCH-1 is planned to commence on 15 December 2026.

HOCH-1 results to date

HOCH-1 was drilled, cased and completed, encountering up to eight biogenic gas reservoirs in the Hall basin floor fan formation and the deeper Hall Channel sands, the company said. Phase 1 testing covered four reservoirs in the Hall Formation and one Hall Channel zone.

ADX said pressure build-up analysis indicated "excellent sand productivity" with a sand extent of at least 600 metres from the well, and that downhole gauge data confirm gas contributions from three additional zones during testing.

Phase 2 plans

Phase 2 will focus on the Hall Channel zones. ADX said post-drill 3D seismic mapping, correlated with nearby wells, indicates "the potential for a large lateral extension" of the Hall Channel reservoirs, with a figure in the release showing an extension of the stratigraphic trap of at least 2.5 kilometres to the southeast. The company said this interpretation is supported by historical reserves data from nearby Hall Channel production wells.

To reach the deeper zones, the rig must remove the current testing string, drill out a cement plug and re-run a testing completion before perforating Test Zone 6. ADX said further deeper Hall Channel reservoirs may also be tested "if considered appropriate".

Vienna Basin work

The rig programme at the Gaiselberg and Zistersdorf fields includes perforating a gas zone and installing a gas completion in an existing well, replacing a pump, and perforating a new production interval with a sand retention completion. ADX's website describes its Vienna Basin field near Zistersdorf as having operated since 1938.

Executive Chairman Ian Tchacos said the combined programme "allows ADX to utilise a contracted work over rig to efficiently and cost effectively incorporate HOCH-1 testing work". He added that results from zones tested so far provide "confidence regarding the testing of additional zones in the Hall Channel Sands."

Pricing context

The company cited Brent Crude at approximately US$100 per barrel and the European TTF November gas contract at approximately EUR 75 per MWh, which it equated to US$25 per MMBTU or an oil-equivalent price of US$152 per barrel. Prices can change.

What remains uncertain

Analysis: The update is primarily a schedule and plan rather than new test data. The production uplift is an expectation, not a result, and short-duration flow tests do not by themselves establish sustained commercial rates or reserves. The extent of the Hall Channel reservoirs rests on seismic interpretation and well correlation, and Phase 2 depends on the workover successfully accessing the deeper zones. The release does not disclose the overall cost of the programme.

ADX said it will report results from the Vienna Basin well work and the HOCH-1 testing as they become available. Technical information in the release was reviewed by Technical Director Paul Fink.

FAQs

Q: When does the ADX programme begin?

A: A contracted workover rig is due to start the programme on 19 October 2026, with Phase 2 flow testing at HOCH-1 planned to commence on 15 December 2026.

Q: How much extra production does ADX expect from the Vienna Basin work?

A: The company said the well work is expected to add approximately 100 barrels of oil equivalent per day, which it described as an approximate 40% increase in its Austrian production. This is an expectation rather than a result.

Q: What will Phase 2 at HOCH-1 target?

A: Phase 2 will focus on the Hall Channel zones, including perforating Test Zone 6. The company said 3D seismic mapping indicates potential for a large lateral extension, although that view rests on seismic interpretation and well correlation.

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