• Based on encouraging results to date, a re-entry into the Sue Duroche 3
exploration well is currently underway, two weeks after reaching total depth.
• A work-over rig is now onsite to convert the exploration well into a monitoring well
within the coming days. Following this workover, long term surface pressure and
gas monitoring data will be acquired over the coming months.
• Monitoring of this data is critical to both planning and executing an extended well
test, following the completion of the drilling of the back-to-back wells.
• Analyses of mud gas samples from elevated helium zones observed in the mud
gas logs within the Pre-Cambrian basement are expected back from Isotech
Laboratories Inc. by early next week.
• Murfin Rig 116 rig is being mobilised to Blythe 13-20 well site and is on track to
spud the well around May 20th
.
• Seismic acquisition program has completed on time, on budget, with no HSE
incidents. The seismic was acquired in a new greenfields hydrogen and helium
area within the Nemaha Project to support future drilling targets.
HyTerra Limited (HyTerra or the Company) has two firm wells in the drilling sequence
which began in April 2025 at the Nemaha Project in Kansas, USA. This marks the first steps for the
Company in executing a comprehensive 12-month exploration work program designed to unlock
the potential of natural (white) hydrogen in Kansas through its 100% owned and operating
subsidiary HYT Operating LLC. This exploration program funding is sourced from the recent
investment in the Company by Fortescue Future Industries Technologies Pty Ltd.
Sue Duroche 3 update
The Sue Duroche 3 well was drilled to a total depth (TD) of 3,453ft MDkb (1,052m) on time, on
budget, with no HSE incidents. The well reached TD on May 1
st, 2025. The mud gas log recorded
hydrogen gas readings at different intervals when drilling, indicating the presence of a hydrogen
play in this area. As previously announced by the Company (6
th May ASX Release), mud gas
samples from an independent laboratory verified hydrogen concentrations of up to 96.1%1
.
Additionally, while drilling deeper into the Pre-Cambrian basement section, elevated helium
readings were also visible on the real time mud gas log data. Analyses of mudgas samples from
deeper in the well (including helium) are awaiting final confirmation from Isotech Laboratories Inc.
The Company will release the mud log results for the well once these are known. Results are
expected by early next week. Continuing petrophysical analysis by expert consultants shows zones
with matrix porosity, dolomitization, and fractures.
Based on mud logs readings and samples received to date, combined with petrophysical analysis,
the Company has decided to accelerate the re-entry of the Sue Duroche 3 exploration well (moving
to ‘Monitor’ in Figure 1 below). The work-over rig (Hurricane Services Rig 735 see in Figure 2) has
mobilised to site and will commence the re-entry and conversion work this week to allow long term
surface pressure and gas monitoring to support planning of potential flow testing.
Unlike conventional hydrocarbons there is not yet a clear methodology for testing hydrogen wells.
Therefore, the Company plans on an intermediate ‘monitoring’ stage to allow data to be gathered
to enable an informed decision to execute a testing programme. It is expected that the monitoring
stage could take several weeks or months but it is required to ensure the best possible well test is
performed. The decision to execute an extended well test decision will be made after the back-twoback wells are finished. Ultimately, extended well testing would be used to evaluate the productivity,
volume, and reservoir characteristics, and ultimately commerciality of any well (“Test” phase in
Figure 1).
Blythe 13-20 update
Murfin Rig 116 is currently being mobilised to Blythe 13-20 location in Morris County and, when the
crew return from their break, the Company expects to spud on or before May 20th
. Drilling is
expected to take approximately 3-4 weeks as the planned total depth (TD) is projected to be deeper
into the basement than Sue Duroche 3. Blythe 13-20 is located approximately 1380m due east of
the historic Scott-1 well (1982) which reported hydrogen concentrations of up to 56%2
. Very little
data for the Scott-1 well is preserved in the Kansas open file well data repository so the intent of
this well is to determine which geological unit is most prospective in this location. If drilling results
are encouraging, the Company will progress towards monitoring of pressure and gas composition
of the well, similar to Sue Duroche 3.
Seismic Acquisition Completed
The Company’s seismic acquisition program has been completed by Paragon Geophysical on time,
on budget, with no HSE incidents. Data will be processed and interpreted along with the recently
acquired airborne survey data, to generate prospects in a new greenfield area for the next drilling
program, currently planned for the second half of 2025.
Benjamin Mee, Executive Director says “We are writing the playbook now on how to drill
hydrogen wells and gather the right information to test them. Unlike conventional hydrocarbons
there is not yet a clear methodology for testing hydrogen wells. It is great to get going on gathering
dynamic information in a cost-effective way by converting a drilled exploration well to a monitoring
well within 2 weeks of TD. This intermediate ‘monitoring’ stage is crucial to both plan and decide on
any future well tests. It really helps to have great local relationships and being surrounded by oil
and gas services that are a phone call away. Further, we are about to drill another well in a different
geological play which will keep accelerating our understanding of these hydrogen and helium
systems. A lot is going on, but happy to say we are meeting all our milestones to ensure safe,
multiple ‘shots on goal.”