Next Section | Table of Contents
doi:10.2204/iodp.sp.302.2004
APPENDIX III : BGS MARINE WIRELINE CORING SYSTEMS
BGS Marine Wireline Corebarrel System (New system)
Three full systems, plus spares, will be carried.
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item
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description
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principal dimensions
|
hole size
|
core size
|
liner
|
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Outer Barrel
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Outer Core Barrel for all systems
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178mm OD, 6.25m Long
|
242mm
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n/a
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n/a
|
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Outer Barrel Core Bits
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Roller Cone, TC and Diamond bits for all Fms
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Various OD, all 76mm ID
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242mm
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n/a
|
n/a
|
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Inner Barrel - Piston Coring
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'ODP' style Piston Corer
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4.5m core length
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92mm
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62mm
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yes
|
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Inner Barrel - non-rotating
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T6 86 corebarrel used with main bit
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5m long core barrel
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241mm
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64mm
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yes
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Inner Barrel - Extended Coring
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T6 86 corebarrel used ahead of main bit
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5m long core barrel
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92mm
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64mm
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yes
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Inner Barrel - Extended Coring
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Piston coring tube extended as ODP XCB
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Up to 5m core length
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93mm
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62mm
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yes
|
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Inner Barrel - rotating push
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As above but with rotation linked to outer
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|
|
|
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Inner Rod - Insert Bit
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Heavyweight inner tube with pilot drill bit
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Makes main bit a drill bit
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242mm
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n/a
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n/a
|
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Inner Rod - Push Coring
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Heavyweight inner tube with valved head
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Shelby tubes 2" & 3"
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56/77mm
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52/74mm
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no
|
|
|
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Heavy Wall + catcher (1.5&3)
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73mm
|
59mm
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yes
|
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Inner Rod - temperature probe
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Memory tool to sit in formation outside bit
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Projection of up to 250mm
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n/a
|
n/a
|
n/a
|
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APC temperature shoe
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Temperature shoe for piston corer
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As piston core shoe
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n/a
|
n/a
|
n/a
|
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Overshot for retrieval
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Longyear System with matching CB heads
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Sliding hammer action
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n/a
|
n/a
|
n/a
|
Notes:
1) A system comprises an outer BHA and two working sets of an inner barrel system.
2) All coring systems except piston corer can be run with a NRV for additional safety.
3) All latch-in systems have a latch-in indicator to ensure proper latching before coring.
4) Main Bit is only currently planned to have one OD size but this may change in the future.
Christensen - BGS System (Old system)
Three full sytems, plus spares, will be carried.
|
item
|
description
|
principal dimensions
|
hole size
|
core size
|
liner
|
|
Outer Barrel
|
Outer Core Barrel for all systems
|
159mm OD, 6.25m Long
|
216-232mm
|
n/a
|
n/a
|
|
Outer Barrel Core Bits
|
Roller Cone, TC and Diamond bits for all Fms
|
Various OD, all 76mm ID
|
216-232mm
|
n/a
|
n/a
|
|
Inner Barrel -non-rotating
|
Standard Inner Barrel - Competent Formations
|
5m core length
|
216-232mm
|
76mm
|
yes
|
|
Inner Barrel - push coring
|
Heavyweight inner tube with push core ahead
|
Geotech Shelby Tubes
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2" shelby
|
50mm
|
no
|
|
Inner Barrel - rotating push
|
As above but with rotation linked to outer
|
||||
|
Inner Barrel - Extended Coring
|
Heavyweight inner tube with core bit ahead
|
5m long (rarely used)
|
75mm
|
57.5mm
|
no
|
|
Inner Rod - Insert Bit
|
Heavyweight inner tube with pilot drill bit
|
Makes main bit a drill bit
|
216-232mm
|
n/a
|
n/a
|
|
Inner Rod - temperature probe
|
Memory tool to sit in formation outside bit
|
Projection of up to 500mm
|
n/a
|
n/a
|
n/a
|
|
Overshot for retrieval
|
Longyear PQ-modified CB heads to accept
|
Sliding hammer action
|
n/a
|
n/a
|
n/a
|
Notes:
1) A system comprises an outer BHA and two working sets of an inner barrel system except push/drill.
2) All coring systems and insert bit systems can be run with a NRV for additional safety.
3) Main Bit size refers to bits already available, other ODs could be provided.
Additional equipment
PQ Overshot and Spares
PQ overshot fishing tool
Handling tools and workshop
Scorpion tongs