Drilling of 16 wells, 160 meter deep, for remote heating and cooling of the main office of Vattenfall AB at Råcksta outside Stockholm, March 1999. Contractor: Malmberg Borrning AB. Wassara W100 drilling system with its low energy consumption, high rate of penetration and minimal effects on the environment in the form of dust was the obvious choice.
A total of 2560 meters was drilled without any adverse effects for the inhabitants in the surrounding apartment blocks.
Sandvik 115 mm
Hammelman 210 bar, 320 liter/min
Clean water, no recirculation
Wassara 3000 mm, 89 mm OD
Granite with quartzite
Wassara Swivel Stenberg 600