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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.
item
description
principal dimensions
hole size
core size
liner
Outer Barrel
Outer Core Barrel for all systems
178mm OD, 6.25m Long
242mm
n/a
n/a
Outer Barrel Core Bits
Roller Cone, TC and Diamond bits for all Fms
Various OD, all 76mm ID
242mm
n/a
n/a
Inner Barrel - Piston Coring
'ODP' style Piston Corer
4.5m core length
92mm
62mm
yes
Inner Barrel - non-rotating
T6 86 corebarrel used with main bit
5m long core barrel
241mm
64mm
yes
Inner Barrel - Extended Coring
T6 86 corebarrel used ahead of main bit
5m long core barrel
92mm
64mm
yes
Inner Barrel - Extended Coring
Piston coring tube extended as ODP XCB
Up to 5m core length
93mm
62mm
yes
Inner Barrel - rotating push
As above but with rotation linked to outer
Inner Rod - Insert Bit
Heavyweight inner tube with pilot drill bit
Makes main bit a drill bit
242mm
n/a
n/a
Inner Rod - Push Coring
Heavyweight inner tube with valved head
Shelby tubes 2" & 3"
56/77mm
52/74mm
no


Heavy Wall + catcher (1.5&3)
73mm
59mm
yes
Inner Rod - temperature probe
Memory tool to sit in formation outside bit
Projection of up to 250mm
n/a
n/a
n/a
APC temperature shoe
Temperature shoe for piston corer
As piston core shoe
n/a
n/a
n/a
Overshot for retrieval
Longyear System with matching CB heads
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.
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
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

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