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Effective Use of Rota-Sonic
Drilling in Site Investigation
Wesley Wray
Business Development Manager
Boart Longyear E&I Drilling Division
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Introduction
• Rota-sonic drilling – What is it and how does it work?
• Different Types of Sonic / Rota-sonic rigs
• Why Consider using Rota-sonic Drilling?
• Project Examples
• Summary
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Rota-Sonic Drilling – What is it and How does it Work
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Basic Principle of Rota-Sonic Drilling
Axial Force or Feed Force
Vibratory Force
Rotary Force
Two counter-rotating weights Inside the
Sonic drill head create high frequency
sonic vibrations.
Energy @ face of bit achieves localised
displacement to shear and penetrate
Slow Rotation to enhance energy &
penetration of hard layers
Steady down pressure to aid
advancement
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Basic Principle of Rota-Sonic Drilling
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Different Types of Rota Sonic/Sonic Drill
rigs
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Different Types of Rigs
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Rota-Sonic or Sonic
Rota-Sonic Drilling Sonic Drilling
Drilling
Method
Rotation, Sonic and axial/feed force Sonic and linear/vertical down feed
Depth
Capability
200 to 250m depending on ground conditions
- Fully Cased
Approximately 20 to 30m depending on ground
conditions – Limited casing capabilities
Ground
conditions
Anything! – can drill through obstructions
which other methods refuse
Loose sands and gravels, soft clays, very weathered
rock, will hit refusal on boulders and man made
obstructions
Max BH
Diameter
300mm (12 inches) 125mm (5 inches)
Max Sample
size
254mm (10 inches) 102mm (4 inches)
Max Install
Size
185mm OD 33mm OD or 42mm OD pre-pack screen
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Why Consider using Rota-Sonic Drilling On Nuclear Sites / Related GI’s?
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Safety
• Serious finger and hand injuries are common
• Poor guarding
• Manual Handling and Heavy lifting can’t be
avoided
• Rig stability during installation
• Inherently un-safe operation
• Not a career option
• Limited lifting required
• Lighter tooling
• Automatic rod breaking
• Rig guarded
• Remote Operating Panel
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RED Site Drilling - Cleanliness
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RED Site Drilling – Fully Cased System
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Reduction in Waste Arisings
• Rota-sonic drilling method produces in the region of 70% to 80% less waste
arisings – Both drilling flush and spoil.
• Reduces costs associated with: – Handling
– Transporting
– Sampling
– Testing
– consigning drilling derived waste.
• Reduces the risk of cross contamination to both the local environmental and
operatives.
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Full Containment System
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Not Subject to Refusal
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Granular Material Sampling
V’s
Cable Percussive
Sample
Rota-Sonic Sample
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High Quality Samples
• Continuous Core Sample
• Controlled extrusion of
sample
• Safe handling for
contaminated samples
• No dilution/cross-
contamination of sample
• Engineers get to log the facts – Not
interpret the losses
• Make decisions on borehole based on
visual evidence
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High Quality Samples
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High Quality Samples
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High Quality Samples
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High Quality Samples
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High Quality Samples
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Plume Delineation – Iso-Flow System
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Rota-Sonic Project Examples
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Rota-Sonic Project Examples
Sellafield Nuclear Licensed Site • Drilled in excess of 300 boreholes both inside
and outside SEP Area
• Drill rigs modified to work on Nuclear Licensed
sites
• System chosen due to:
• Innovative Approach
• Speed of drilling
• Reduction in waste produced
• Cleanliness of drilling system
• Not Subject to Refusal
• Quality of core recovered
• Projects completed include:
• Contaminated Land and Groundwater
Management Project
• HAST GI
• SMF GI
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Rota-Sonic Project Examples
EDF, Chinon – Nuclear License Site
• Environmental Ground Investigation
• Ground water Monitoring wells around Reactor
building.
• Part of Decommissioning Works for the site
• Chosen due to:
• minimising risks associated with cross
contamination
• Minimising Dose uptake
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Rota-Sonic Project Examples
CEA – Nuclear Licensed Site, France
• Removal of disused 17inch diameter by 6m
deep steel storage vessel’s.
• Buried in ground within concrete
• Used conventional core barrel and specially
designed 18inch corebarrel.
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Conclusions
•Raise the awareness of rota-sonic drilling / it’s
capabilities
•Another drilling method for your toolbox
•Very Versatile Drilling System
•Provides many advantages for completing GI’s on
Nuclear Sites of sites classified as RED
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Conclusions – Myths and Facts
•Can Rota-Sonic drill for VOC’s?
•Can Rota-Sonic drill dry?
•Can Rota-Sonic Penetrate all materials?
•Can Rota-Sonic Provided a Representative Sample?
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Thank you for your Time – Any Questions? B
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E&
I
Wesley Wray
Boart Longyear E&I
Business Development Manager
Tel: 01259 727780
Email:
