Table T1. Operations plan and time estimate for proposed Site NT2-03, Expedition 315.
| Hole |
PTD (mbsf) |
Water depth (m) | Total (mbsl) | Operations | Estimated days | Number of cores |
|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
|
| B | 600 | 2178 | 2778 | Prepare for drilling (guidehorn, BHA, etc.) |
1.0 |
|
|
|
|
|
|
RIH HPCS/ESCS assembly |
0.5 |
|
|
|
|
|
|
Core with HPCS and ESCS to 600 m |
5.5 |
64 |
|
|
|
|
|
Carry out jet-in test before coring and start coring at new hole - Try to take core by HPCS and ESCS to PTD; if PTD cannot be reached, go to Hole C - Require core orientation- Hole size: 11-7/16 inch - Temperature measurement every 50 m by APCT-3 or DVTP |
|
|
|
|
|
|
|
POOH, lay out HPCS/ESCS assembly |
0.5 |
|
|
|
|
|
|
Total drilling days: |
7.5 |
|
|
Hole B remarks:- No retrieving guidehorn - Penetration rate 120 m/day - HPCS/ESCS 9.5 m/bbl - Pump weighted mud into hole before POOH (abandonment) - May encounter thousands of faults and deformed sequences |
|
|
||||
|
|
|
|
|
|
|
|
| C | 1000 | 2178 | 3428 | Move to Hole C, RIH RCB assembly |
0.5 |
|
|
|
|
|
|
Drill to 600 m by RCB |
1.5 |
|
|
|
|
|
|
If Hole B cannot reach PTD, start to take core from refusal depth of Hole B - Limit daily progress to 400 m/day to maintain good hole - Hole size: 9-7/8 inch - Core with RCB to 1000 m |
6.5 |
69 |
|
|
|
|
|
Take 650 m core by RCB - Take overlapping core of Hole B - Wiper trip |
0.5 |
|
|
|
|
|
|
Displace with weighted mud, drop bit, POOH to seafloor |
0.5 |
|
|
|
|
|
|
POOH, lay out RCB assembly |
0.5 |
|
|
|
|
|
|
Retrieve guidehorn |
0.5 |
|
|
|
|
|
|
Total drilling days: |
10.5 |
|
|
Hole C remarks: - RCB 9.5 m/bbl - If core does not go to 700 m, consider coring at riser hole |
|
|
||||
|
|
|
|
|
Expedition 315 total drilling days: |
18.0 |
|
|
|
|
|
|
Transit between base and location: |
0.0 |
|
|
|
|
|
|
Equipment and fuel supply before expedition: |
0.0 |
|
|
|
|
|
|
Total operation days (without contingency): |
18.0 |
|
|
|
|
|
|
Contingency: |
4.0 |
|
|
|
|
|
|
Expedition 315 total operation days: |
22.0 |
|
|
|
|
|
|
|
|
|
| Riser | 700 | 2178 | 2878 | Prepare for running BHA and 36 inch conductor |
0.5 |
|
|
|
|
|
|
Run and jet-in 36 inch conductor to 60 m - Conductor setting depth will be decided by result of jet-in test |
1.5 |
|
|
|
|
|
|
Drill 26 inch hole to 700 m - Set guidehorn |
2.0 |
|
|
|
|
|
|
Run and cement 20 inch casing |
3.0 |
|
|
|
|
|
|
POOH, lay out BHA |
1.0 |
|
|
|
|
|
|
Total drilling days: |
8.0 |
|
|
Riser hole remarks: - No retrieving guidehorn |
|
|
||||
|
|
|
|
|
Expedition 315 riser total drilling days: |
8.0 |
|
|
|
|
|
|
Transit between base and location: |
0.0 |
|
|
|
|
|
|
Equipment and fuel supply before expedition: |
0.0 |
|
|
|
|
|
|
Total operation days (without contingency): |
8.0 |
|
|
|
|
|
|
Contingency: |
5.0 |
|
|
|
|
|
|
Expedition 315 riser total operation days: |
13.0 |
|
|
|
|
|
|
|
|
|
Notes: PTD = proposed total depth, BHA = bottom-hole assembly, RIH = run in hole, HPCS = hydraulic piston coring system, ESCS = extension shoe coring system, POOH = pull out of hole, DVTP = Davis-Villinger Temperature Probe, APCT-3 = third-generation advanced piston corer temperature tool, RCB = rotary core barrel