Drilling of a geothermal well at Akureyri, Iceland, in November 2001. The first 200 meter of the well was drilled with a conventional air hammer but then water in the well prevented further use of this technology. Since the rate of penetration with traditional tri-cone bits was too slow (1 meter/hour) it was decided to use Wassara W100 system. The drilling was carried out by Alvarr/Geovarme, a joint venture between Alvarr ehf and Geovarme AS, with financial support from Orkusjodur (Icelandic Energy Fund).
The rate of penetration was increased to 25 meter/hour with the Wassara system. Total drilled depth was 404 meter.
Wassara 115 mm
Pratissoli MH 45
Clean water, no recirculation
60 mm coiled tubing (2500 meter on the reel)