Well drilling

 

The well-drilling programme is based upon identifying approximately five production wells (for taking fluid from under the ground) and approximately six reinjection wells (for returning fluid to the under the ground) for each power station. Although all care will be taken to identify the best well sites, drilling geothermal wells typically has between a 50% and 80% success rate of finding wells that will deliver to the needs of the power station as well as achieving sustainable reservoir management.

Drilling each well is expected to take around 30-40 days of continuous activity, with additional time needed to move the drilling rig between well sites. This means that it could take around 12 months or more to complete well-drilling for one power station.

As drilling is a continuous activity, light may be visible from locations within the line of site of the drilling activities. The light intensity will not cause any nuisance to neighbours.

Before Top Energy applies for resource consent, the company will identify the likely noise impact on neighbours to the site, taking into consideration the contours of the land and how noise of this type will travel. Top Energy will then consult with those people who are likely to be directly affected by drilling noise to identify ways to avoid, remedy or mitigate this effect.

Top Energy will operate and test the wells before constructing the power station to ensure that the geothermal resource meets operational requirements. It is likely that the timeframe from beginning well-drilling for one power station to commissioning that power station will be around four years.