Post on 27-Apr-2018
HKIE Civil Division - Technical Seminar
Application of Horizontal Directional Drilling
(HDD) Technique in Hong Kong(HDD) Technique in Hong Kong
28 January 2013
Creating
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Mr. MP CHAN
Ir. Neil WONG
Ir. Vincent CHAN
Contents
1. Current Application of HDD in Hong Kong
2. Advanced HDD Guidance System
3. Advanced HDD Drilling Method
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4. Potential Application of HDD in Hong Kong
5. Example of HDD Application in Hong Kong –
Submarine Outfall of Sewage Treatment Plants in
Lamma Island
6. Difficulties of Lamma HDD Project
7. Q & A Creating
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Current HDD Application in HK
� Water pipes
� Electric cable ducts
� Gas pipes
� Sewage pipes
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� Sewage pipes
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Horizontal ties installation
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Submarine outfalls installation
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Advanced HDD Guidance System
� Basic components of Paratrack II guidance system:
� Steering tool probe
� Drillers console interface
� Power guide supply
� Computer
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Computer
� Accuracy: +/- 2% of vertical depth of hole
� Capable of working over 300m depth
� Can work with Earth magnetic field and artificial
magnetic field
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Basic System
� Working on Earth magnetic field
� Continuous display of Azimuth, Inclination and Tool Face Angle readings
during drilling (MWD)
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Basic System
� Alignment of mudmotor bent-sub and Paratrack steering
tool probe “Tool Face Angle”
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Basic System
� Electric wire connection
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Basic System
� Paratrack II computer display during drilling
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Advanced System
� Guide Wire Tracking
� Working on artificial magnetic field, not affected by magnetic interference
� Display of electric wire loop on the PII computer display
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Electric Wire Loop Method
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Recent job reference in HK
� Lamma - YSW hole trajectory
� 0.6m from the target on plan after drilling 551m
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Recent job reference in HK
� Lamma - SKW hole trajectory
� 1.7m from the target on plan after drilling 762m
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Magnetic Source Method
� For sites with the following constraints: -
� Ground surface are with busy roads or private building lots etc.
� There is only one end access of the hole(s).
It is impossible to install guide wire loop to perform
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� It is impossible to install guide wire loop to perform
“Guide Wire Tracking”
� The magnetic source must be with known position reference
� High precision, centimeter accuracy
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Magnetic Source Method
� Magnetic Guidance
Tool (MGT) Technique
� Passive Magnet
Ranging (PMR)
� Micro-Coil Technique
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Ranging (PMR)
Technique
� Rotating Magnet (RM)
Technique
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Gyro Steering Tool (GST) Method
� High precision optical gyroscope
� 0.2m deviation for 300m drilling length, 0.7m for 1000m hole
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Parallel Drilling
� Parallel drilling using the MGT guidance method
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Intersect Drilling� Intersect drilling using the Magnetic Source guidance method
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Ground Freezing Hole Drilling
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Sacrificial Hole
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Grout Hole Drilling for Tunnel Works
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Grout Hole Drilling for Tunnel Works
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Drainage Hole Drilling for Slope Works
� Drainage of moving slopes
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Potential Application of HDD in HK
� Just add a bit imagination plus some creative
and innovative ideas, you should be able to
think of other potential HDD applications in HK.
� Lastly, new methods require prudent approach
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� Lastly, new methods require prudent approach
to make it work!
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Example of HDD Application
in Hong Kong
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� Lamma Island - an outlying island without any centralised
public sewerage systems at present
� Individual house owners still using septic tanks and soak-
Project Background
� Individual house owners still using septic tanks and soak-
away system for sewage treatment
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� Some septic tank and soak-away systems do not function
effectively due to site limitations and lack of regular
maintenance
Project Background
� Construction of village sewerage network systems and
sewage treatment works at both Yung Shue Wan (YSW) and
Sok Kwu Wan (SKW) is necessary
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Project BackgroundConstruction of Sewage Treatment Works (YSW & SKW)
Contract No. DC/2009/13
Client Drainage Services Department
Consultants Scott Wilson CDM Joint Venture
Main Contractor Leader Civil Engineering Corporation Limited
HDD Specialist VSL Intrafor HK
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Submarine
Outfall Pipe
Corals
Diffuser
Yung Shue Wan (YSW) Works
Sewers
Works under DC/2009/13
Legend:Yung Shue Wan
Sewage Treatment
Plant Existing Sewers
Corals
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Submarine
Outfall Pipe
Diffuser
Sok Kwu Wan (SKW) Works
乡村污水收集系统第1阶段工程污水处理厂建造工程
魚類養殖區
Existing Sewers
Works under DC/2009/13
Legend:
FCZ Fish Culture Zone
Sok Kwu Wan Sewage
Treatment PlantPumping Station No.2
Pumping
Station
No.1
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Comparison of Construction Methods for
Submarine Outfall
Dredging Method HDD
Majority of existing corals will be lost Existing corals would not be affected
Existing Fish Cultural Zones (FCZ) may be affected.
Existing Fish Cultural Zones (FCZ) would not be affected during may be affected. would not be affected during
construction by HDD
Dredging and disposal of large amount of materials required
Only small amount of dredged materials will be generated
Complaints about sediment and chemicals release during large-scale
dredging works
Relatively lower chance of complaints as the scale and extent of dredging is
small
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Comparison of Construction Method for
Submarine Outfall (Cont’d)
Dredging Method HDD
Complaints from mariners about large quantity of barges working in
large construction area
Less plant, smaller construction area and shorter duration of construction
Mitigation measures during dredging Nearly no influence on the daily life Mitigation measures during dredgingand backfilling will affect the daily life
of fishermen and mariners
Nearly no influence on the daily life of fishermen and mariners
Operation of Helipad which is in close vicinity to Site will be affected
No influence on the operation of Helipad
Modification of existing seawall structure is required
No modification of existing seawall structure is required.
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Scope of Works (HDD)
Yung Shue Wan Sok Kwu Wan
Diameter of Outfall Pipe 400mm 280mm
Length of Outfall Pipe 550m 730m
Diameter of Drill Hole 600mm 450mm
Max. Depth of Drill Hole -55.5mPD -43.2mPD
Curvature 600m 500m
Geological Condition Marine Deposit
to Grade II Rock
Marine Deposit/ Alluvium
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Principles of HDDLand Side Marine Side
Land Side Marine Side
Pilot Hole
Reaming
Receiving
Pit
Seabed
`
`
Entry Pit
Entry Pit
Land Side Marine SidePipe Pulling
Seabed
Seabed
`
`
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Drill Rods Storage
Water Storage Tank
Site Establishment
Site Boundary
Storage
45t Mobile
Crane Control Cabinet
High Pressure
Mud Pump
Active Tank
Drill Rig
Recycling
Unit
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Drill Rig
High Pressure
Mud Pump
Site Establishment
Entry Pit
Recycling
Unit
Mud Pump
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Pilot Drilling
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Pilot Drilling
250mm Roller Bit
� 6 ¾” Mud Motor
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� Receiving Platform: Steel Frame + Pontoon
Working Platform Steel Frame to support the Temporary Casing
PontoonPlan
View
Reaming
Sea Water Level
Temporary Casing
(700mm Dia.) Alignment of Pilot Drill
PontoonPontoon
Elevation
View
Sea bed Level
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Receiving PlatformTemporary Casing
hung on Platform
Flat Top Barge
Backhoe
Reaming
Flat Top Barge
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Reaming
Support Frame
Temporary Casing hung
on Steel FramePontoon
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Reaming
Reaming
450mm Hole Opener
600mm Hole Opener
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Derrick Lighter
(Assist Pulling)
Pontoon
Receiving Platform
Derrick Lighter (Control
Pipe End Alignment
During Pulling)
Pipe Pulling
Welded Pipe Pulled
toward Receiving Platform
Alignment of
Submarine Outfall
YSW Sewerage
Treatment Work
Drill Rig
Patrol Sampan
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Pipe Pulling
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Pull Head
Pipe Pulling
Pull Head
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Difficulties in Lamma
HDD ProjectHDD Project
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Difficult Ground Profile to Drill Through
� Inferred ground profile by the pilot hole drilling rates at YSW site
Joint number J0-J1 J2-J4 J5-J15 J16-J41 J42-J43 J44-J56
Hole section length 0-24m 24-53m 53-159m 159-411m 411-430m 430-551m
0.7 0.5 3.0 10.1 0.3 1.3 Drilling shift
0.7
shift
0.5
shift
3.0
shift
10.1
shift
0.3
shift
1.3
shift
Average drilling rate34.4
m/shift
58.0
m/shift
35.4
m/shift
25.0
m/shift
64.3
m/shift
92.2
m/shift
Inferred
ground profileSeawall
CDG /
HDGMDG SDG MDG / HDG
CDG, ALL &
MD
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Difficult Ground Profile to Drill Through
� Need to deal with both the softest (Marine Clay) and the hardest (200 MPa Granite) ground which did influence the design and operation considerations.
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HDD Path
Marine Deposit
Grade I / II Granite
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Pulling Stress < 33% of the Pipe Material Tensile Strength
� Pipe buoyancy during pull back operation
� Solution: Fill the pipe with drill mud
Soil / Rock
Product
Pipe
Air Drill Mud
Filter Cake
Cuttings
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Cuttings Cleaned Out from the Product Pipe at
YSW
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Unforeseen Ground Condition
� Design of SKW hole trajectory at tender stage
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Thank You
Q & A
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