ADX Energy Ltd
ADX Energy's HOCH-1 Drill Bit Is Turning — Here's What Investors Need to Know
ADX Energy Ltd (ASX: ADX) has confirmed that drilling is actively progressing at its Hochfeld-1 ("HOCH-1") shallow gas exploration well in Upper Austria, with the well advancing through its intermediate hole section at 398 metres measured depth as of 27 April 2026. This ADX Energy HOCH-1 drilling update marks a meaningful operational checkpoint in what the company describes as the first of three permitted shallow gas wells planned for 2026 — a programme that, in a success case, could unlock material gas resources in one of Europe's established gas-producing regions.
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Drill in the Ground, Clock Ticking: Where HOCH-1 Stands Right Now
According to the company's operational update, HOCH-1 spudded on 16 April 2026 and has navigated an early operational setback — severe mud losses encountered in a gravel package at approximately 100 metres depth. The losses could not be resolved with cement plugs, requiring the team to redrill the interval with a larger 12¼ inch hole and run 9⅝ inch casing to 111 metres to isolate the problem zone before resuming drilling in 8½ inch hole.
The mud loss events in shallow gravel-heavy formations are a recognised hazard in this geological setting. The engineering response — widening the hole and setting casing — is a standard, if time-consuming, solution. The well is now drilling ahead and back on trajectory according to operational reports.
The immediate path forward from the current position is outlined as follows:
- Drill 8½ inch hole to 430 metres and run and cement 7 inch casing
- Drill 6⅛ inch hole from 430 metres to total depth of approximately 1,430 metres MD (1,145 metres true vertical depth)
- Run wireline logs to evaluate reservoir quality and gas presence
- Time to total depth from current position: approximately 7 days
- Wireline logging to follow within one to two days of reaching total depth
A successful well will be cased and suspended for production testing to determine reserves potential.
What Is HOCH-1 Actually Chasing?
The Miocene Hall Formation — A Proven Gas Host
According to company reports, HOCH-1 is targeting Miocene-aged sandstone reservoirs within the Hall formation — a gas-bearing interval with an established production track record in Upper Austria. Nearby analogous wells in this same formation have recorded initial production rates of up to 9 million standard cubic feet per day (mmscf/d), equivalent to approximately 1,500 barrels of oil equivalent per day (boepd) per well.
The prospect has been mapped using high-resolution 3D seismic data, with both amplitude anomalies and a Class 3 AVO (Amplitude Versus Offset) response confirming the presence of direct hydrocarbon indicators (DHIs) — geophysical signals that correlate with gas-bearing sands in this basin. The trap is described as a combination structural-stratigraphic feature: a three-way dip closure with an updip pinch-out seal.
Resource Potential at a Glance
The HOCH prospect carries the following unrisked prospective resource estimates (ADX 50% net interest):
| Scenario | Gross (BCF) | ADX Net 50% (BCF) |
|---|---|---|
| Low Estimate (P90) | 1.5 | 0.75 |
| Best Estimate (P50) | 5.2 | 2.60 |
| Mean | 8.0 | 4.0 |
| High Estimate (P10) | 17.3 | 8.65 |
Economic Context
At current gas prices, the company notes that an 8 BCF discovery would generate in excess of EUR 120 million in gross revenue — a figure that underscores why European gas pricing represents a meaningful tailwind for project economics in this jurisdiction.
Understanding the Technical Terms
Investors new to oil and gas exploration may encounter several terms throughout HOCH-1 updates. Here's what the most important ones mean:
Prospective Resources: Quantities of gas that may be recoverable if the well is successful. These are unrisked — meaning they don't factor in the probability of the well finding what it's looking for. They represent the upside if the geological model is correct, not a guarantee.
P90 / P50 / P10: Probability thresholds for resource estimates. P90 means there is at least a 90% probability that the actual recovery will meet or exceed that figure (the conservative case). P50 is the best estimate (50% probability of exceeding). P10 is the optimistic case (10% probability of exceeding). The Mean sits between P50 and P10.
BCF (Billion Cubic Feet): A standard unit of volume for natural gas. One BCF of gas, at European prices, represents a substantial revenue figure.
AVO (Amplitude Versus Offset): A seismic analysis technique that examines how seismic wave amplitudes change at different angles of incidence. A Class 3 AVO response, as seen at HOCH, is typically associated with gas-saturated sands — making it a useful pre-drill indicator.
DHI (Direct Hydrocarbon Indication): Geophysical anomalies in seismic data that are directly attributable to the presence of hydrocarbons. DHIs increase geological confidence before a well is drilled.
Measured Depth (MD) vs. True Vertical Depth (TVD): MD is the total length of the wellbore as drilled (including any horizontal or deviated sections). TVD is the straight-line vertical depth from surface. HOCH-1 has an MD of approximately 1,430m but a TVD of approximately 1,145m, indicating a slightly deviated well path.
The Bigger Picture: Three Wells, Ten Prospects, One Programme
HOCH-1 is not a standalone event. It is the first step in a 2026 shallow gas drilling programme that includes three permitted wells across two exploration licences in Upper Austria:
- HOCH-1 (ADX-AT-I licence) — drilling now
- GOLD-1 (ADX-AT-II licence) — to follow
- SCHOE-1 (ADX-AT-I licence) — to be drilled after GOLD-1
The company has also identified up to ten shallow gas prospects across its ADX-AT-I and ADX-AT-II licences. Below is a summary of the two drill-ready prospects within the ADX-AT-I licence that have been quantified:
| Prospect | Low P90 Gross (BCF) | Best P50 Gross (BCF) | Mean Gross (BCF) | High P10 Gross (BCF) |
|---|---|---|---|---|
| HOCH | 1.5 | 5.2 | 8.0 | 17.3 |
| SCHOE | 1.9 | 5.3 | 6.4 | 12.2 |
| AT-I Total | 3.4 | 10.5 | 14.4 | 29.5 |
The two prospects together carry a mean gross prospective resource of 14.4 BCF across the ADX-AT-I licence, with ADX holding a 50% net interest in both.
Crucially, the company has flagged a potential cluster development opportunity: if both HOCH and SCHOE are successful, shared infrastructure — including a gas processing plant and a tie-in to the existing Upper Austrian pipeline grid (approximately 2 km away from the HOCH drill site) — could allow both fields to be developed together, materially improving the economics of each standalone discovery.
Why the Economics Work Here
The economic case for HOCH-1 rests on several converging factors that are worth understanding individually:
- Shallow depths: Total depth of approximately 1,430 metres means lower drilling costs and faster well times compared to deep exploration targets
- High flow rates: Analogue Hall formation wells have produced at up to 9 mmscf/d, which drives rapid payback if reserves are confirmed
- Infrastructure proximity: The pipeline tie-in point is only 2 km from the drill site, removing a common barrier to monetisation for small gas discoveries
- European gas pricing: Gas prices in Europe have remained materially elevated relative to pre-2021 levels, improving the revenue outlook for any discovery
- Cluster potential: HOCH and SCHOE sit close enough together for shared facilities, creating the possibility of a multi-well development at reduced per-well capital cost
What Comes Next — Timeline to Watch
| Milestone | Expected Timing |
|---|---|
| Reach 8½ inch hole TD (approximately 430m) | Imminent |
| Run and cement 7 inch casing | Within days |
| Drill 6⅛ inch hole to TD (approximately 1,430m MD) | Approximately 7 days from current position |
| Wireline logging | 1–2 days after TD |
| Well results / initial evaluation | Within approximately 10 days of current status |
| GOLD-1 spud (ADX-AT-II) | Following HOCH-1 completion |
| SCHOE-1 spud (ADX-AT-I) | Following GOLD-1 completion |
ADX has confirmed it will provide regular operational updates as results become available — so the near-term news flow from this programme is likely to be active.
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Investment Thesis: Why ADX Energy Deserves a Closer Look
Key Takeaway:
"ADX Energy is executing on a multi-well shallow gas exploration programme in Upper Austria, targeting proven Miocene reservoirs with mean prospective resources of 8.0 BCF at HOCH alone. With the drill bit turning, wireline results expected within approximately 10 days, and two further permitted wells to follow, the next several weeks represent a significant catalyst window for the company."
Several elements combine to make this programme worth monitoring closely. Furthermore, each of the points below reinforces why the ADX Energy HOCH-1 drilling update warrants attention from investors tracking small-cap exploration opportunities.
1. Near-Term Binary Catalysts
Wireline logging results from HOCH-1 will arrive quickly, providing a clear read on whether the geological model has been validated. This is a concrete near-term event with meaningful implications for the share price and future programme decisions.
2. Scalable Prospect Inventory
Ten identified shallow gas prospects across two licences means a single success doesn't define the programme. Each discovery, however, builds the case for the next well and for an eventual cluster development — creating a compounding exploration narrative.
3. Proven Reservoir Analogue
The Hall formation is not speculative geology. Nearby wells have produced at high rates in the same formation, providing geological confidence that productive reservoirs exist in this basin. The question at HOCH is whether the specific trap holds gas — not whether the reservoir can produce.
4. Operator Control and Economic Interest
ADX operates the well and holds a 50% economic interest, giving the company direct control over operational decisions and timeline. In addition, this level of working interest means ADX captures a meaningful share of any upside from a discovery.
5. Infrastructure-Ready Setting
The proximity to existing pipeline infrastructure removes a common stumbling block for small-cap explorers. Consequently, the path from discovery to revenue is materially shorter than in frontier basins — a fact that strengthens the overall investment case for this ADX Energy HOCH-1 drilling update and the broader Upper Austria programme.
The next well update will be one to watch closely.
Ready to Dig Deeper Into ADX Energy's 2026 Drilling Programme?
With the drill bit turning at HOCH-1 and wireline results expected within days, ADX Energy's multi-well shallow gas programme in Upper Austria is entering a pivotal window for investors. From a proven Miocene reservoir to infrastructure-ready infrastructure and two further permitted wells to follow, the opportunity warrants a closer look. Visit adx-energy.com to explore the full details of ADX Energy's Austrian gas exploration strategy and assess what a discovery could mean for the company's trajectory.
