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Table T1. Operation plan and time estimate for Expedition 316. (See table notes.)

Hole PTD
(mbsf)
Water
depth (m)
Total
(mbsl)
Operation Estimated
days
Number
of cores
Proposed Site NT1-03
B 600
3955
4555
Move to site, preparation for drilling (BHA, etc.)
1.0

RIH HPCS/ESCS
0.5

Core with HPCS/ESCS to 600 mbsf:- HPCS and ESCS to PTD; if cannot reach PTD, go to Hole C- Require core orientation- Hole size: 11-7/16 inch- Temperature measurement every 50 m by APCT-3 or DVTP (0.5 days)
5.5
63
POOH, lay out HPCS/ESCS
1.0

Total drilling days:
8.0


C 950
3955
4905
Move to Hole C, RIH RCB
0.5

Drill to 600 mbsf by RCB:- If Hole A <PTD, start core at Hole A refusal depth(take overlapping cores in Hole C)- Limit progress to 400 m per day to maintain good hole- Hole size: 9-7/8 inch
1.5

Core with RCB to 950 mbsf:- Take 400 m of core by RCB- Take overlapping core of Hole B- Penetration rate: 100 m per day
3.5
37
Displace with weighted mud, POOH, lay out RCB assembly
1.0

Total drilling days:
6.5


Proposed Site NT2-01
B 600
2391
2991
Move to site (13 nmi), RIH HPCS/ESCS assembly
1.0

Core with HPCS/ESCS to 600 mbsf:- HPCS/ESCS to PTD; if cannot reach PTD, go to Hole C- Require core orientation- Hole size: 11-7/16 inch- Temperature measurement every 50 m by APCT-3 or DVTP
5.5
64
POOH, lay out HPCS/ESCS assembly
0.5

Retrieve guidehorn
0.5

Total drilling days:
7.5


C 1000
2391
3391
Move to Hole C, set riserless wellhead with 20 inch casing
2.0

Install guidehorn
0.5

RIH RCB assembly
0.5

Drill with RCB to 600 mbsf:- If Hole B <PTD, take core from Hole A refusal depth- Limit progress to 400 m per day to maintain good hole- Hole size: 9-7/8 inch
1.5

Core with RCB to 1000 m- Take 400 m core by RCB- Take overlapping core of Hole A- Penetration rate: 100 m per day
4.0
43
POOH
0.5

RIH hole opener
0.5

Open hole to 17-1/2 inch (penetration rate: 400 m per day)
2.5

Wiper trip, spot high-viscosity mud, POOH stand-back hole opener
1.0

Run 13-3/8 inch casing
1.0

Cement with POOH running tool
0.5

Retrieve guidehorn, etc.
1.0

Total drilling days:
15.5


Expedition 316 total drilling days:
37.5

Transit between base and location:
0.5

Equipment and fuel supply before expedition:
0.0

Equipment discharge after expedition:
2.0

Total operation days (without contingency):
40.0

Contingency (including weather and equipment downtime):
9.5

Expedition 316 total operation days:
49.5

Notes: PTD = proposed total depth. HPCS = hydraulic piston coring system, ESCS = extended shoe coring system, RCB = rotary core barrel, BHA = bottom-hole assembly. RIH = run in hole, POOH = pull out of hole. DVTP = Davis-Villinger Temperature Probe, APCT-3 = third-generation advanced piston corer temperature tool.

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