Table T2. Expedition 348 operations plan.
| Operation | Base ROP (m/day) |
Days | Subtotal (days) |
Total (days) |
|---|---|---|---|---|
| 1. Transit, deploy transponders, retrieve corrosion cap, preparation for spud | 4.5 | 4.5 | ||
| Transit from Shingu to the site | 0.5 | |||
| Deploy 10 transponders/calibration | 1 | |||
| Wellhead survey and recover corrosion cap | 1 | |||
| Preparation for run BOP and riser | 2 | |||
| 2. Run and set BOP and riser | 11 | 15.5 | ||
| Run BOP and riser w/fairing at low-current area | 7 | |||
| Drift from low-current area to the site | 2 | |||
| Test BOP | 2 | |||
| 3. Set 13-3/8 inch casing | 19 | 34.5 | ||
| Run 17 inch bit w/MWD/LWD BHA, DOC inside 20 inch casing | 2 | |||
| Kick off from 880 m, 880–1170 mbsf | 100 | 3 | ||
| Drill 17 inch hole w/LWD, 1170–2300 mbsf | 180 | 7 | ||
| Run and cement 13-3/8 inch casing | 5 | |||
| Test BOP | 2 | |||
| 4A. Set 11-3/4 inch casing | 43 | 77.5 | ||
| DOC and LOT | 2 | |||
| Cut 10-5/8 inch RCB core 100 m interval, 2300–2400 mbsf | 25 | 4 | ||
| Drill 12-1/4 inch hole w/LWD to 3600 mbsf, 2300–3600 mbsf | 100 | 13 | ||
| Open hole to 14-1/2 inch w/underreamer, 2300–3600 mbsf | 100 | 13 | ||
| Run and cement 13-3/8 inch casing | 5 | |||
| Test BOP (3 times) | 6 | |||
| 4B. Set 9-5/8 inch casing | 38 | 72.5 | ||
| DOC and LOT | 2 | |||
| Cut 10-5/8 inch RCB core 100 m interval, 2300–2400 mbsf | 25 | 4 | ||
| Drill 12-1/4 inch hole w/LWD, 2300–4400 mbsf | 100 | 21 | ||
| Run and cement 9-5/8 inch casing | 5 | |||
| Test BOP (3 times) | 6 | |||
| 5. Suspend hole | 8 | 85.5 (80.5) | ||
| Set cement plug or bridge plug in hole | 2 | |||
| Retrieve BOPs and marine risers | 6 | |||
| 6. Set corrosion cap, retrieve transponders, transit | 2.5 | 2.5 | 88 (83) | |
| 7. Contingency | 41 | 129 (124) | ||
| Mechanical downtime (operation time × 4%) | 4 | |||
| Wait on weather (operation time × 15%) | 13 | |||
| Typhoon evacuation (2 times × 12 days) | 24 | |||
| Total: | 129 (124) |
ROP = rate of penetration. BOP = blowout preventer. MWD = measurement-while-drilling, LWD = logging-while-drilling, BHA = bottom-hole assembly. DOC = drill out cement. LOT = leak-off test. RCB = rotary core barrel. Green shading = optional Operation 4.
Previous | Close | Top of page