Cooper Basin geothermal powers up

GEOTHERMAL exploration and development pioneer Geodynamics has completed the long-awaited flow test at its Habanero 4 well, part of the Innamincka Deeps joint venture in the Cooper Basin in South Australia.

In a statement to shareholders, the company said the open flow test achieved a maximum production rate of 35kg per second at 29 megapascals.

The 82-minute test recorded temperatures of 241 degrees Celsius at depths of 4130m and indicated that the well had the potential to flow at even higher rates. Drilling reached a depth of 4200m, and the company stated that the successful result kept the venture on schedule.

Geodynamics managing director and chief executive Geoff Ward said he was pleased with the success, after numerous setbacks at previous wells.

“This is the highest productivity result achieved at the Habanero location and confirms our view of the quality of the Habanero 4 well,” he said.

“The results exceed those achieved at Habanero 3, which recorded a stabilised flow of 27kg/s [kilograms per second] after local stimulation, and again confirms the high productivity and temperature of the Habanero resource – positioning Geodynamics well for a successful trial of [the] 1MWe [megawatt electrical] Habanero Pilot Plant in the first half of next year.”

The Innamincka Deeps JV is focussed on higher temperature-enhanced geothermal systems deeper than 3500m. Geodynamics is the operator of the venture (with a 70 per cent stake) and is in partnership with Origin Energy (30

per cent).

The Habanero 4 results vindicated Geodynamics; Origin had seemingly lost faith in the project and refused to contribute any more money after several delays created a $2.8 million cost blowout.

Geodynamics reported that local stimulation of Habanero 4 was planned and further testing would follow.

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