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.
Result:
A total of 2560 meters was drilled without any adverse effects for the inhabitants in the surrounding apartment blocks.
Equipment:
Hammer
Wassara W100
Bit
Sandvik 115 mm
Pump
Hammelman 210 bar, 320 liter/min
Drilling fluid
Clean water, no recirculation
Drill pipe
Wassara 3000 mm, 89 mm OD
Rig
Nemek 710
Formation
Granite with quartzite
Other
Wassara Swivel Stenberg 600