Effective Use of Rota-Sonic Drilling in Site Investigation
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1 Effective Use of Rota-Sonic Drilling in Site Investigation Wesley Wray Business Development Manager Boart Longyear E&I Drilling Division 1
2 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 2
3 Rota-Sonic Drilling What is it and How does it Work 3
4 Basic Principle of Rota-Sonic Drilling Vibratory Force Two counter-rotating weights Inside the Sonic drill head create high frequency sonic vibrations. face of bit achieves localised displacement to shear and penetrate Rotary Force Slow Rotation to enhance energy & penetration of hard layers Axial Force or Feed Force Steady down pressure to aid advancement 4
5 Basic Principle of Rota-Sonic Drilling 5
6 Different Types of Rota Sonic/Sonic Drill rigs 6
7 Different Types of Rigs 7
8 Rota-Sonic or Sonic Drilling Method Depth Capability Rota-Sonic Drilling Rotation, Sonic and axial/feed force 200 to 250m depending on ground conditions - Fully Cased Sonic Drilling Sonic and linear/vertical down feed Approximately 20 to 30m depending on ground conditions Limited casing capabilities Ground conditions Max BH Diameter Max Sample size Max Install Size Anything! can drill through obstructions which other methods refuse 300mm (12 inches) 254mm (10 inches) 185mm OD Loose sands and gravels, soft clays, very weathered rock, will hit refusal on boulders and man made obstructions 125mm (5 inches) 102mm (4 inches) 33mm OD or 42mm OD pre-pack screen 8
9 Why Consider using Rota-Sonic Drilling On Nuclear Sites / Related GI s? 9
10 Safety Limited lifting required Lighter tooling Automatic rod breaking Rig guarded Remote Operating Panel 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 10
11 RED Site Drilling - Cleanliness 11
12 RED Site Drilling Fully Cased System 12
13 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. 13
14 Full Containment System 14
15 Not Subject to Refusal 15
16 Granular Material Sampling V s Rota-Sonic Sample Cable Percussive Sample 16
17 High Quality Samples Continuous Core Sample Controlled extrusion of sample Safe handling for contaminated samples No dilution/crosscontamination of sample Engineers get to log the facts Not interpret the losses Make decisions on borehole based on visual evidence 17
18 High Quality Samples 18
19 High Quality Samples 19
20 High Quality Samples 20
21 High Quality Samples 21
22 High Quality Samples 22
23 Plume Delineation Iso-Flow System 23
24 Rota-Sonic Project Examples 24
25 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 25
26 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 26
27 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. 27
28 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 28
29 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? 29
30 Boart Longyear E&I Thank you for your Time Any Questions? Wesley Wray Boart Longyear E&I Business Development Manager Tel:
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