“Perforation of the upper part of the Reifling formation has not provided
sufficient flow to determine the reservoir fluid composition.
Sampling has recovered black solid particles of unknown composition, which
may be affecting well flow.
Further flow analysis and sampling will be undertaken prior to a decision on
forward program including reservoir acidization.”
Key points:
- ADX holds a 75% economic interest in the Welchau discovery and other emerging
prospects in the Welchau Investment Area located in ADX’ ADX-AT-II licence in Upper
Austria (refer Figure 3).
- The RED Drilling & Services W-102 workover rig (Workover Rig) has been set up and used
to install well completions required for testing the Welchau-1 well.
- Following testing of the Steinalm formation, the Steinalm perforations have been isolated
with a packer and a new test completion has been run in the well to perforate and test the
upper section of the 128 metre thick (vertical thickness) Reifling formation. Three intervals
have been perforated in the upper Reifling including (1) 1324 m to 1340 m (16 m), (2) 1346
m to 1351 m (5 m) and (3) 1358 m to 1382 m (24 m), all Measured Depths (refer Figure 1)
The shallower Reifling formation was perforated on the 28th of November 2024 and limited
inflow was observed at surface. The well was shut in over the weekend to provide enough
time for the well to flow a sufficient volume for reservoir fluids to enter the tubing string. The
fluid level in the well observed on the 3rd of December indicated limited inflow (less than 1
cubic metre or approx. 6 barrels). Sampling of the well fluid indicated only completion brine
and fine solid particles of unknown origin (“Solid Contaminants”) were present in the well
as shown in Figure 2. The Solid Contaminants recovered had a petroliferous odour.
- The well has been left shut in to determine if it can flow naturally, analyse the composition
of well fluids including the Solid Contaminants recovered to date and potentially flow
sufficient formation fluids (“Minimum Flow Volume”) to enter the production tubing - by filling
the annular space from the perforations to the bottom of the tubing string (“Further Well
Flow Information”).
- The forward program will be determined once Further Well Flow Information is collected
and assessed including whether to proceed with the acidization of the reservoir which is
common practice for overcoming well bore damage and enhancing productivity in
carbonate reservoirs.
ADX Energy Ltd reported the completion of the first flow test of the Steinalm formation in the
Welchau-1 discovery well on the 20th of November 2024. The Welchau-1 well is located in the ADX-AT-II licence
in Upper Austria. ADX holds a 75% economic interest in the Welchau Investment Area which contains the
Welchau discovery and other emerging prospects in the Northern Calcareous Alps (refer Figure 3).
Following testing of the Triassic Steinalm formation, the Steinalm testing perforations have been isolated with a
packer and a new test completion has been run in the well to perforate and test the upper section of the 128
metre thick Reifling formation. Three intervals have been perforated in the upper Reifling including (1) 1324 m
to 1340 m MD (16 m), (2) 1346 m to 1351 m (5 m) and (3) 1358 m to 1382 m (24 m) MD (refer Figure 1).
The Reifling formation was perforated on the 28th of November and limited inflow was determined from down
hole fluid levels. The well was shut in over the weekend to provide enough time for the well to flow a sufficient
volume for reservoir fluids to enter the tubing string. The fluid level in the well was observed on the 3rd of
December indicating limited inflow (less than 1 cubic metre or approx. 6 barrels). Sampling of the well fluid
indicated only completion brine (not reservoir fluid) and fine solid particles of unknown origin (“Solid
Contaminants”) were present in the well as shown in Figure 2. The Solid Contaminants recovered had a
petroliferous odour.
The well has been left shut in to determine if it can flow naturally, analyse the composition of well fluids recovered
to date and potentially flow sufficient formation fluids (“Minimum Flow Volume”) to enter the production tubing -
by filling the annular space from the perforations to bottom of the tubing string (“Further Well Flow Information”).
The forward program for the Welchau-1 well will be determined once Further Well Flow Information is collected
and assessed including whether to proceed with the acidization of the reservoir which is common practice for
overcoming well bore damage and enhancing productivity in carbonate reservoirs.