Table T1. Operations and time estimates for Expedition 319. (See table notes.)
|
Proposed Site |
PTD (mbsf) |
Water depth (m) |
Total (mbsl) |
Operation |
Estimated days |
Number of cores |
|---|---|---|---|---|---|---|
|
NT2-11B |
||||||
|
1600 |
2060 |
3660 |
Move to site, preparation for drilling (BHA, etc.) | 7 |
|
|
| Run and jet-in 36 inch conductor to 60 mbsf | 3 |
|
||||
|
Drill 26 inch hole to 700 m - Run and cement 20 inch casing |
8.5 |
|
||||
| Run BOP w/riser fairing, land and test BOP | 11 |
|
||||
|
Make up and run 17 inch DOC assembly - Displace hole w/mud - XLOT - Drill 12-1/4 inch hole to 1510 mbsf - Cut RCB core (90 m) to 1600 mbsf - Wiper trip - Wireline Log 1 - Open hole to 17 inches for 13-3/8 inch casing - Wiper trip - Run and cement 13-3/8 inch casing |
21.5 | ? | ||||
| Run 13-3/8 inch casing scraper | 1 |
|
||||
| Run USI-CBL-VDL-GR | 1 |
|
||||
| Run VSI, zero offset and walkway | 2 |
|
||||
| (contingency – dummy casing hanger/temp recorder) | (2) |
|
||||
| Retrieve BOP, riser, and fairing | 7 |
|
||||
| Set corrosion cap, retrieve transponders | 2 |
|
||||
| Contingency days | 19 |
|
||||
| Total days | 83 |
|
||||
|
NT2-01J |
||||||
|
525 |
2535 |
3060 |
Move to site, prepare for drilling (BHA, etc.) | 2 |
|
|
| Prepare and rig up 20 inch casing | 4.5 |
|
||||
| Run and jet-in 20 inch conductor to 36 mbsf | 2.5 |
|
||||
|
Make up and run 12-1/4 inch LWD assembly - Drill LWD to 525 mbsf - Wiper trip - Set 9-5/8 inch casing - Dummy sensor run - Wireline logging |
10.5 |
|
||||
|
Set retrievable bridge plug w/sensors Set suspension cap, retrieve transponders |
2.5 |
|
||||
| Contingency days | 7 |
|
||||
| Move to Shingu | 1 |
|
||||
| Total days | 31 |
|
||||
Notes: PTD = proposed total depth. mbsf = meters below seafloor. BHA = bottom-hole assembly. DOC = depth-of-cut. XLOT = extended leak-off test. RCB = rotary core barrel. USI = ultrasonic imager, CBL = cement bond log, VDL = variable density logger, GR = gamma ray. LWD = logging-while-drilling.