Directional Drilling/Gas Drainage Logistics - Baijigou...
Transcript of Directional Drilling/Gas Drainage Logistics - Baijigou...
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Directional Drilling/Gas
Drainage Logistics
- Baijigou Mine
Frank Hungerford
Valley Longwall Drilling
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Introduction – Mine Audits
• Mine Safety - safe to operate in?
• Seam conditions – is the coal drillable?
• Drilling applications
• Services – air, water, power – fittings
• Access, transport, dimensions
• Surface facilities
• Accommodation
• Location, access to mine site
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Baijigou Service Project
• CAMDA – AMSI hold contract to gas drain Baijigou longwall blocks
• GeoGAS consulted for gas content and drainage characteristics
• Drilling Project in 2 components
• VLD to complete the underground component
• Mitchell Drilling to complete the SIS component
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Location - Ningxia
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Baijigou Mine
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Drive to Baijigou Mine
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Baijigou – Mountain Drive
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Baijigou – Local Environment
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Baijigou Township
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Baijigou Township
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Contract Signing Ceremony
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Contract Signing Ceremony
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Initial Borehole Layout - Baijigou Mine
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Initial Audit Results
• Cross-measure drilling from under the seam
• Stone strength apparently f2 (20 MPa)
– Revised to f7-f12 (70-120 MPa)
• Angled drilling would require rig with
vertical adjustment – Modular
• Mono-rail requirement for each site
• Design straight stone sections to allow for
rotary roller-cone drilling if required
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Baijigou Rotary Gas Drainage
-40
10
60
-150 -100 -50 0 50 100 150
Baijigou Rotary Cross-Section
Vert
ical
Dis
pla
cem
en
t (m
)
1640 Roadway
40 deg
55 deg
66 deg 67 deg
Seam
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Borehole Layout - Baijigou Mine
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Modular Rig – Feed Frame
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Modular Rig – Power Pack
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Modular Rig – Operators Console
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Site Preparations
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Site Layout - Baijigou Mine
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Drill Site – Side View
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Borehole Collar – Standpipe Fittings
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Gas Manifold – Drill Site
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Water Trap – Drill Site
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Drilling Design
• Rotary roller-cone 150mm x 3m - standpipe
• Rotary roller-cone 98mm to coal
• Directional drill up into seam roof
• Branch from coal intersect and follow 8m line
below roof
• 1.5 deg/6m lateral curve and 1.0 deg/6m vertical
curve (combined 1.8 deg/6m)
• Regular sharp roof intersections for profile
definition – unstable upper seam coal
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Drill Site – Rig Alignment
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Profile Design
0
50
100
150
0 100 200 300 400 500 600
Baijigou B1 - Borehole Depth (m)
Vert
ical
Dis
pla
cem
en
t (m
)
Road
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Lateral Design
-150.0
-100.0
-50.0
0.0
0 100 200 300 400 500 600
Baijigou B1 - Down Track (m)
Late
ral
Devia
tio
n (
m)
Target Azimuth 305.0 deg
Roadway - borehole has to be outside 100m Left
Entry Heading 280.0 deg
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Borehole B1 Profile
0
50
100
150
0 100 200 300 400 500 600
Baijigou B1 - Borehole Depth (m)
Vert
ical
Dis
pla
cem
en
t (m
)
Road
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Borehole Layout - Baijigou Mine
-150.0
-100.0
-50.0
0.0
0 100 200 300 400 500 600
Baijigou B1 - Down Track (m)
Late
ral
Devia
tio
n (
m)
Target Azimuth 305.0 deg
Roadway - borehole has to be outside 100m Left
Entry Heading 284.2deg (280.0 deg)
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Profile Design
0
50
100
150
0 100 200 300 400 500 600
Baijigou B2,B3 - Borehole Depth (m)
Vert
ical
Dis
pla
cem
en
t (m
)
Right-hand Leg 3m Lower
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Borehole Layout - Baijigou Mine
-150.0
-100.0
-50.0
0.0
0 100 200 300 400 500 600
Baijigou B2,B3 - Down Track (m)
Late
ral
Devia
tio
n (
m)
Target Azimuth 305.0 deg
Entry Heading 287.0 deg
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Borehole Layout - Baijigou Mine
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Calibration Site and SIS Environment
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Calibration Site and SIS Environment