Directional Drilling

What can Devico technology help in

Tunnelling Projects

For Hong Kong Tunnelling SocietyChris Tai

Devico AS Regional Manager

www.devico.no

30th Nov 2007

Devico AS – The Company

• Founded in 1988 by Mr. Viktor Tokle, the inventor of Devico Technologies

• Norway based with branches in North America, Bulgaria and Hong Kong

• All tools and equipment are made and calibrated in our own workshop in Norway

• 30+ employees worldwide2

CEDD/GEO TGN-24 (21-Jan-05)

• GEO Technical Guidance Notes 24– Site Investigation for Tunnel Works– “3.1 Drilling of the horizontal boreholes can be carried out

either from the excavation face, an intermediate shaft or from the other end of the tunnel to investigate the ground conditions, in particular to check whether suspected features of poor ground are present and if so their nature and extent.”

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TGN-24

– “4.1 Directional drilling techniques are now available to drill from ground level to great depth and then along a horizontal alignment. This method does not require provision of working space at the tunnel level and can be very useful in GI for deep tunnels.”

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Directional Drilling - Definition

• The direction of drilling can be controlled

• The drill hole is drilled to follow the pre-defined drill hole trajectory as close as possible

• The drill hole is drilled to hit the pre-defined target

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Directional Drilling - Definition

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Directional Drilling - Definition

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Product

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Product

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Devico Method – A complete solution

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Planning

Drilling

Surveying

Devico Method – DeviSoft Planning

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Devico Method – DeviDrill WL 76 Drillling

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DeviDrill Wireline 76 (US Patent : 6,516,900)

Technical Specification

• Hole : N-Size (76mm) • Core : 31.5mm / 3m length• Recommended dogleg = 9deg/30m

( R=180m )• Max. dogleg = 12deg/30m• Onboard survey tool• Measure while drilling (MWD)• Requires no reaming out• Bluetooth communication

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Dogleg

• A jargon in directional drilling industry• Three dimensional (3D) borehole trajectory• Expressed in terms of deg/30m

– E.g. dogleg = 9 means deviated 9 degrees in 30m as a summation of both in inclination and azimuth(bearing)

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DeviTool Peewee

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Technical Specification

Electronic Multishot System (EMS) Weight : 2.4 kg / 5.29lb w/ batteriesDiameter : 30mm / 1.18”Length = 975mm / 38.4”Battery Capacity : ~40,000 measuresInternal Memory : 1,984 measuresTemperature : -15 to 75oC (5 to 167oF)Pressure : 300bar / 4350psiAzimuth Range : 0o-360o

Inclination Range : 0o-180o

Bluetooth communicationAccuracy :-

Inclination : 0.2o

Azimuth : 0.5o

Toolface (Gravity) : 0.2o

Toolface (Magnetic) : 1o

DeviFlex

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Technical Specification

Electronic Multishot System (EMS) Weight : 20kgDiameter : 40mmLength = 4mBattery Capacity : 3-4months (continues)Internal Memory : 1,984 measuresTemperature : -15 to 75oC (5 to 167oF)Pressure : 300bar / 4350psiInclination Range : 0o-180o

Bluetooth communicationAccuracy :-

Inclination : 0.2o

Azimuth : 0.01o/stationToolface (Gravity) : 0.2o

Applications

• Geotechnical projects – Drill to follow the tunnel alignment to investigate the geological information

• Mining industry – Multilateral borehole drilling, sidetracking

• Target drilling – By pass certain area under the ground and hit the ultimate target

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DeviCase – Eagle’s Nest Tunnel (HKG)

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DeviCase – Eagle’s Nest Tunnel (HKG)

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DeviCase – Po Shan Road (HKG)

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DeviCase – New York City (USA)

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Water supply tunnel in New York City

Site under Manhattan Bridge

Start angle -45 Degree to horizontal

Length 900 m

December 2002.

Operator Kinectriks

DeviCase – Shinkansen (Japan)

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Tunnel for Shinkansen high speed train Length 500 meter Deviation 20 degrees Date Nov-Dec 2002 Operator Nikko Exploration

DeviCase – Bømlafjord (Norway)

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Subsea tunnel Length 930 mReduced riskImproved QA Resulted in redesigned tunnel allignment

DeviCase – Boston (USA)

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Metrowest water tunnel

Length 700 meter

Reduced risk and better bids

DeviCase – Aurora / Guyana (S. America)

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DeviCase – Shea Creek (Canada)

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Thank you

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www.devico.no