ADX Energy Ltd.: Resumption of Welchau Testing
Wien (pta005/13.02.2026/07:40 UTC+1)
Well prepared for acid stimulation and testing of the Reifling Formation at the Welchau 1 well
"An acid stimulation will be performed to overcome wellbore damage and test the shallowest potential reservoir encountered in Welchau 1 well. The testing program is intended to determine if moveable hydrocarbons are present and the flow characteristics of the Reifling Fm. which is interpreted to be at or near a light oil accumulation mapped updip of Welchau."
Key points:
- Welchau Testing: Preparation for the resumption of testing the Welchau 1 well in the ADX-AT-II licence is complete. Flow testing of the Reifling Fm. will be undertaken after acidisation* of the reservoir to overcome formation damage during drilling. The Reifling Formation is the shallowest of four (4) fractured carbonate reservoirs intersected at Welchau 1. Only one of the three considered to be testing candidates has been tested to date.
*Acidisation is a long-established practice to overcome wellbore damage and enhance productivity in carbonate reservoirs
- Flow Testing Objectives: To determine the hydrocarbon content and flow characteristics of the Reifling Fm. as well as potentially providing confirmation of updip light oil in theWelchau anticline mapped approximately 500 metres westward, updip of the Welchau 1 well (refer to Figure 1).
- Disruption of Testing: The Reifling Formation testing was interrupted in January 2025 due to objections to environmental clearances for drilling and testing by environmental non-governmental organisations (ENGOs). In September 2025 the Upper Austrian State Administrative Court ruled that ADX may resume testing activities at the Welchau 1 well.
- Regional Hydrocarbon Play with Multiple Appraisal Objectives: Welchau is a strategically significant gas condensate and potential light oil discovery, characterised by overpressured reservoir conditions with multiple petroleum sources across several formations. Further appraisal can be undertaken by a side track (targeting updip light oil) or deepening (targeting gas-condensate) of the Welchau 1 well (refer ASX release dated 4 February 2026).
- Welchau Drilling Results: The Welchau 1 well encountered hydrocarbon shows over a 450-metre interval intersecting three (3) primary fractured carbonate reservoirs that are considered promising for testing and ongoing appraisal. Continuous hydrocarbon shows and light oil recovered at Welchau 1 confirm the presence of a light oil system. Pressure and structural data demonstrate pressure continuity and aquifer communication between Welchau 1 and the downdip Molln 1 gas-condensate discovery well, indicative of an extensive, interconnected petroleum system with significant gas condensate resources.
For more details please see the PDF file.
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| Emitter: |
ADX Energy Ltd. Ölzeltgasse 3/8 1030 Wien Austria |
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|---|---|---|
| Contact Person: | Vesna Blazevic | |
| Phone: | +43 676 6893465 | |
| E-Mail: | office@adx-energy.at | |
| Website: | www.adx-energy.com | |
| ISIN(s): | AU000000ADX9 (Share) | |
| Stock Exchange(s): | Free Market in Frankfurt, Hamburg, Munich, Stuttgart, Tradegate BSX | |
| Other Stock Exchanges: | Australian Securities Exchange (ASX), Sydney |