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In 2014







Baker Hughes pumps

water supply

7 x geophones

5 x geophones

Figure b

y: Geir Ov


Above: UNIS CO2 Lab well park with the deepest well, Dh4, completed at 970m subsurface.



Figure left: Geir Ove Titlestad
Well Schematic planned for Dh5R as part of the 
2012 injection tests

Figure right: Telescope drill strings and their uses.

2015 Status of wells in Longyearbyen CO2 Well Park

All deeper wells in Adventdalen were drilled as telescope operations, with cement shoes fixing drill tubes into the 
well bore as casing for each step in the operation. All wells have been outlined in drilling programs by Titlestad (2010-
2012), and summarized in post-job reports of Titlestad (2010-2013). 

All drill strings standing - cemented-in tubes in the wells are identical except for the size (diameter). The biggest size 
is HQ followed by NQ, BQ and the smallest size is WL46. When starting to drill a well the biggest string is employed 
and the well is finished with the smallest string, on accord with a telescopic drilling. All the string can enter each other 
– NQ goes inside HQ, BQ goes inside NQ etc.  

To stablelice the drill string when final depth is reached, cement is pumped down the string and up on the outside, to 
create a stable cement shoe. Then the next, smaller drill string is placed inside and drilled down to a deeper level. This 
is repeated until the targeted depth is reached.

Detailed reports on the drilling and design of wells Dh5 to Dh8 are presented by Titlestad (2010-2013). For further 
information around these wells and their completion, can be found at:

  UNIS CO2 Lab reports. 

Drilling technique and technical achievements