Horizontal Directional Drilling - · PDF fileHorizontal Directional Drilling Large-scale,...
Transcript of Horizontal Directional Drilling - · PDF fileHorizontal Directional Drilling Large-scale,...
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Horizontal Directional Drilling
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Horizontal Directional Drilling
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Why HDD
� Surface is neither broken nor damaged
� Restoration and repair are not required
� No public hazard or traffic disturbance
� Low social costs, because detours are
avoided
� Short equipping, drilling and construction
times
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Why HDD
� Very economic for river, road, canal, rail
track, bridge crossings
� Least chance of accident & injury of workers
� Wide spectrum of application
� Pulling force measurement and position
determination are possible
� Latest Modern Organized System.
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Horizontal Directional Drilling
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The Skipper Advantage
� Providing services for over a decade
� Rendering HDD Services to eminent clients
� HDD Services to eminent clients:
• Reliance, Vodafone, Airtel
• CESC, KMC, KMDA, WBSEB
• JUSCO, PHED, BSNL, MTNL
• TTSL, VSNL, Eastern Command, SIDCGL
• Green Gas, IOCL, OFDC, GAIL , L&T
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The Skipper Advantage
� Skipper has mid sizes HDD Rigs for smaller
applications such river crossings, canal
crossings, road crossings up to 550 m.
� Technical expertise with a team of
professionals
� Financial stability of Skipper ensures that
every project is executed successfully
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Horizontal Directional Drilling
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HDD Technology
� HDD Technology stands for subsurface
construction works
� Applied when fewer trenches or non-
continuous trenches are required
� Rapidly growing sector of the construction
and civil engineering industry
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Horizontal Directional Drilling
� Large-scale, high-technology version of
guided boring with computerized remote
control over the drilling head
� Can traverse large distances horizontally and
work at greater depths
� Better guidance and tracking system using
radio-driven locator technology to track the
drilling head
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Horizontal Directional Drilling
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Steps in HDD
� Preliminary Survey: Gather all details of the
project area like location, topography,
vicinity, underground activity & utilities
� Planning: Study or drill path area, gradient
to be maintained, length of drilling based on
• Ground Penetrating Radar Survey
• Soil Testing
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Horizontal Directional Drilling
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Non Surface-launched Trenchless Drilling
� Non surface-launched TTs require entry and exit pit
� These are not done from the ground surface only
� Distinguished from guided boring or HDD by a lack of
directional control at the cutting head
� Traditional boring/coring uses a receiving pit to
“catch” the drilling apparatus so localized
directional control is not required
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Non Surface-launched Trenchless Drilling
� Pipe Pulling/Pushing: Uses hydraulic,
mechanical, or air jacks to push/pull a pipe
through a horizontal stratum
� Compaction methods: Distinguished from
jacking methods because they do not remove
soil which is compacted in situ, and remains
around the installed pipe.
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Non Surface-launched Trenchless Drilling
� Water Pressure: Used for assisting the
drilling or cutting operation. Pressure makes
space through the soil for laying of pipe.
� Tunneling: Technique that involves
excavating soil or rock at the leading edge of
the boring machine and erecting a lining
system from within the excavated space
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Ground Penetrating Radar System
� RADAR (Radio Direction and Ranging)
technology used for detecting underground
utilities.
� Helps identify the utilities like water supply
pipeline, power cables, telephone cables
� Helps determine depth and age of utility
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Ground Penetrating Radar System
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Soil Testing & Plastic Index
� Soil tested to determine physical
characteristics like hardness, compressive
strength, plasticity
� The plastic index, which indicates the ideal
working condition for drilling operation to
take place, is determined
� The drilling fluid, appropriate to the plastic
index, is prepared & supplied to the drilling
hole
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Pilot Boring
� A drill bit is chosen depending upon the type of rock
material and soil condition
� Soil drilling fluid is prepared according to the Plastic
Index
� The data log sheet is prepared based on the surveys
and the necessary RPM, Pitch, angle/deflection
� Depths are derived from invert levels along with the
pulling force required
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Pilot Boring
� A entry pit and exit pit may be excavated if
necessary
� The Pilot bore is drilled slowly maintaining
the necessary gradient using the tracking &
guidance system.
� The Tracker measures the depth at every
meter already marked by lime (CaCO3)
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Tracking
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Reaming
� The pilot drill bit is removed and the reamer
of necessary size is attached for enlarging
the hole
� Reaming is done in two or three passes with
sufficient step increase in the reamer size
� Reaming also evens the bore hole
� Helps stabilize pipe laying by spraying
bentonite fluid
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Reamers
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Product Pipe Laying
� Once the hole is ready for the next step:
pulling the product pipe
� The reamer in the last pass at the exit
location is attached by the product pipe
conduit that is prepared
� The pipe is then pulled through the bore
hole and placed at the desired location
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Pipelines
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Water & Sewerage Pipelines
� HDPE: High Density Polyethylene
Used for water & sewerage lines. Conform to
IS 4984,IS 14333 of grade PE 80 and PE 100
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HDPE Pipelines
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Water & Sewerage Pipelines
� MS Pipes: Mild Steel Pipes, API pipes
Excellent resistance to corrosion, can
withstand high pressure. Conform to IS:1239
/ IS:3589 / IS:4270 / IS:1978 /IS 9295 etc.
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Steel Pipelines
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Thank you
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