IODP Expedition 316 Scientific Prospectus

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

Hole	PTD (mbsf)	Water depth (m)	Total (mbsl)	Operation	Estimated days
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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