Devico AS Olkiluoto September, 2007. Olkiluoto nuclear power plant Olkiluoto Nuclear Power Plant is one of Finland's two nuclear power plants. The Olkiluoto.

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Presentation transcript:

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 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 Access tunnel: 5.5 km tunnel 1:10 Main characterisation level –420 m Lower characterisation level –530 m Repository 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.

Statistics DepthDirectionInclination

Statistics DepthDirectionInclination

Drilling Drilled two sections à 9 meters meters: Dogleg setting 2.5 / Dogleg app meter: Dogleg setting 2.5 / Dogleg app. 5 No return water. Dark, very hard granite. Almost without fractures, but quart veins.

Results – meters. DeviFlex PeeWee 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!