Devico as olkiluoto september 2007
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Devico AS Olkiluoto September, 2007. Olkiluoto nuclear power plant. Olkiluoto Nuclear Power Plant is one of Finland's two nuclear power plants. The Olkiluoto plant consists of two reactors each 860 MW. One 1720 MW reactor is under construction. Supposed to start in 2011. Onkalo.

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Devico as olkiluoto september 2007

Devico ASOlkiluotoSeptember, 2007


Olkiluoto nuclear power plant
Olkiluoto nuclear power plant

Olkiluoto Nuclear Power Plant is one of Finland's two nuclear power plants.

The Olkiluoto plant consists of two reactors each 860 MW.

One 1720 MW reactor is under construction. Supposed to start in 2011.


Onkalo
Onkalo

All nuclear waste produced in Finland must be disposed in Finland.

Olkiluoto has been determined to become the site of disposal of Finnish nuclear waste.

Long term project, intend to start up in 2020.


Repository
Repository

Access tunnel:5.5 km tunnel 1:10

Main characterisation

level –420 m

Lower characterisation

level –530 m

Repository

Ventilation shaft


Ventilation shaft
Ventilation shaft

Depth: 530 meter deep.

The ventilation shaft will be reamed up later.

Our drilling demands was less than 1,75 meter deviation from vertical axis.


Olkiluoto 2005
Olkiluoto 2005

Devico was first time hired in 2005 in Olkiluoto for a similar project

Successful results, no survey shows more than 2 meters deviation from vertical axis.

3 steerings on the way down.


SMOY

  • Worked in cooperation with SMOY.

  • - Diamec U8 drill rig.

  • - NQ rods.

  • Triple tube Corac N3/50.

  • 2 shifts – App. 25 days to finish the borehole.


Directional drilling
Directional drilling

  • Challenges:

  • - Stringent demands

  • - Find the correct direction.

  • Find the toolface.

  • Solutions:

  • Accurate surveying.

  • Repeated and overlapping surveying.

  • Some statistical approaches.




Drilling
Drilling

Drilled two sections à 9 meters.

100-110 meters:Dogleg setting 2.5 / Dogleg app. 7

320-330 meter:Dogleg setting 2.5 / Dogleg app. 5

No return water.

Dark, very hard granite. Almost without fractures, but quart veins.


Results 0 345 meters
Results – 0-345 meters.

PeeWee

DeviFlex

Smoy’s EMS

North - East


Conclusion
Conclusion

  • Possible to orientate hole within stringent demands.

  • Some “confusing” survey results.

  • Important to know the steering capabilities of the DeviDrill in the rock.

  • Teamwork, teamwork! Easy cooperation on the drill site in this project.



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