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Drilling operations 


and well-logging



Out of the wells drilled on behalf of the Longyearbyen CO2 Lab; 

2 wells were drilled in Hotellneset along the road side towards the airport (Dh’s1-2).  Dh1, 2, and 3 underwent a well 
bore collapse when attempting to drill through the fault zone in layers at 450-500 m. DH1 and 2 were abandoned. Dh3 
was confirmed to be open down to 300 m in February 2010, but freezes in the top 100 meters.  

It was through the experience of these critical challenges that Dh4 was successfully drilled in Adventdalen in 2009 
using a series of telescope drill strings. Reaching a depth of 969,8 m it is the deepest hole  drilled on behalf of the 

Dh4 saw the successful completion  of Phase 1 of the Longyearbyen CO2 Lab 2007 - 2009

Table below: Alvar Braathen
Well Status as reported in the “Longyearbyen CO2 lab 2007-2009 Phase 1 Final report” 

5.  Drilling operations and well-logging, 2010-2012

After the unsuccessful attempt to drill at Hotellneset the drill site was moved to Adventdale Dh3 being the first well 
drilled at this location. The Adventdalen valley was developed into what now is referred to as the UNIS CO2 Well Park. 
Adventdalen is situated 5-6 km outside of Longyearbyen, Svalbard, and is well situated to service the mine, the pow-
erstation and the community. The Well Park in Adventdalen has 6 wells with depths from 61 m to 970 m.

The Longyearbyen CO2 project has drilled 7 deeper wells for testing and monitoring purposes. In addition, one swal-
low well (61m) was drilled and cored to harvest information on the permafrost and its status within the subject area. 
In the Phase 2 project, wells Dh5 to Dh8 were drilled, and are described herein. Dh1 to Dh4 are summarized in the 
Phase 1 report (see Braathen et al. 2010). The last well that was drilled was the well DH5R in 2012, when all exploration 
drilling operations for the Longyearbyen CO2 project were finalized. 

Table below: From Senger et al. (2013 – UNIS report 2013-6) 

Overview of the wellbores with critical parameters. The positions were measured using a different glob-

al positioning system (DGPS) and co-ordinates are related to the WGS84 projection system. ‘A.k.a’=also 

known as/alternate borehole name.

Status of drilling operation at the end of Phase 1