Devico ASOlkiluotoSeptember, 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.

OnkaloAll 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.

RepositoryAccess tunnel:5.5 km tunnel 1:10

Main characterisationlevel –420 m

Lower characterisationlevel –530 m

Repository

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

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

Challenges:

- Stringent demands

- Find the correct direction.

- Find the toolface.

Solutions:

- Accurate surveying.

- Repeated and overlapping surveying.

- Some statistical approaches.

StatisticsDepth Direction Inclination

455 101.62 -89.5

458 318.19 -89.47

461 156.68 -89.79

464 62.17 -89.32

467 340.71 -89.33

470 195.76 -89.88

473 217.34 -89.87

474 72.38 -89.32

475 8.04 -89.19

476 100.17 -89.63

StatisticsDepth Direction Inclination

455 101.62 -89.5

458 318.19 -89.47

461 156.68 -89.79

464 62.17 -89.32

467 340.71 -89.33

470 195.76 -89.88

473 217.34 -89.87

474 72.38 -89.32

475 8.04 -89.19

476 100.17 -89.63

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.

DeviFlexPeeWee

Smoy’s EMS

North - East

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.

Thanks for the attention!