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Geothermal Drilling with W100 at Tunahus, Sweden

The apartment building complex of Tunahus in Lund, southern Sweden, wanted to reduce their heating costs for its 203 apartments. The answer was an energy storage consisting of 35 holes with a depth of 190 meters which gives a total of 6,650 meters. The first 30-60 meters are cased. Malmberg is the turn key contractor for the complete project which includes drilling (performed by Malmberg Borrning AB) and installation of the heat pump facility. Wassara was chosen due to the difficult formation, which consists of clay, silt, gravel and fractured zones in the bedrock.


The Wassara technology has been very advantageous in the "hard to penetrate" geology around Lund.



Wassara W100


Tubex XL 115, Wassara 115 mm


Malmberg Borrning AB, Woma-pump 320 l/200 bar

Drilling fluid

Clean water from a fire post

Drill pipe

OD 76 and 89 mm, 6,3 mm thickness


Nemek 700


Clay, silt and gravel on fractured bedrock


Wassara Swivel Stenberg 600, Wassara Service Equipment WSE-BP W80/W100