Table T1. Summary of operations completed, Holes U1383D, U1383E, U1382B, and U1384A.
| Operational task | Start | End | Task time | |||
|---|---|---|---|---|---|---|
| Date (2011) |
Time (h) |
Date (2011) |
Time (h) |
|||
| Hours | Days | |||||
| Hole U1383D: APC core to basement, XCB core basement contact | ||||||
| Position hole on line halfway between Holes U1383B and U1383C, then offset 5 m at 315° | ||||||
| Handle BHA (will take 3 h) | 7 Nov | 0315 | 7 Nov | 0715 | 4.0 | 0.17 |
| Trip: surface to mudline, ±2 h in 4425 m of water. | 7 Nov | 0715 | 7 Nov | 1245 | 5.5 | 0.23 |
| Pick up top drive and space out drill pipe (will take 1 h) | 7 Nov | 1245 | 7 Nov | 1345 | 1.0 | 0.04 |
| Spud Hole U1383D at 1426 h | ||||||
| APC core (no orientation): (mudline) 0–45 mbsf; recover Cores 336-U1383D-1H through 6H | 7 Nov | 1345 | 7 Nov | 2015 | 6.5 | 0.27 |
| Change coring system (will take 0.75 h) | 7 Nov | 2015 | 7 Nov | 2100 | 0.8 | 0.03 |
| XCB core basement: 45–46 mbsf at 1 m/h (1 m of penetration in 1 h) | 7 Nov | 2100 | 7 Nov | 2315 | 2.3 | 0.09 |
| Trip: depth to mudline: from 46 mbsf to mudline, plus 0 h | 7 Nov | 2315 | 7 Nov | 2345 | 0.5 | 0.02 |
| Clear seafloor at 2350 h | ||||||
| Hole U1383D totals: | 7 Nov | 0315 | 7 Nov | 2345 | 20.5 | 0.85 |
| Hole U1383E: APC core to basement, XCB core basement contact | ||||||
| Offset 10 m on bearing of 135° from Hole U1383D | ||||||
| Run into hole with APC core barrel and space out with bit at 4419 mbrf (will take 2 h) | 7 Nov | 2345 | 8 Nov | 0045 | 1.0 | 0.04 |
| Spud Hole U1383E at 0038 h, 8 Nov 2011 | ||||||
| APC core without orientation: 0–43.2 mbsf | 8 Nov | 0045 | 8 Nov | 0730 | 6.8 | 0.28 |
| Change coring system (will take 0.75 h); basement = 43.2 mbsf | 8 Nov | 0730 | 8 Nov | 0745 | 0.2 | 0.01 |
| XCB core sediment: 43.2–44.2 mbsf at 1 m/h | 8 Nov | 0745 | 8 Nov | 0945 | 2.0 | 0.08 |
| Trip: depth to mudline: from 44.2 mbsf to mudline, plus 1 h | 8 Nov | 0945 | 8 Nov | 1015 | 0.5 | 0.02 |
| Clear seafloor at 1000 h | ||||||
| Hole U1383E totals: | 7 Nov | 2345 | 8 Nov | 1015 | 10.5 | 0.44 |
| Transit to Hole U1382B | 8 Nov | 1015 | 8 Nov | 1445 | 4.5 | 0.19 |
| Hole U1382B: APC core to basement, XCB core basement contact | ||||||
| Arrive on location at 1522 h | ||||||
| Trip: from 4300 to 4450 mbrf (will take 0.5 h) | 8 Nov | 1445 | 8 Nov | 1515 | 0.5 | 0.02 |
| Pick up top drive and space out drill pipe (will take 1 h) | 8 Nov | 1515 | 8 Nov | 1615 | 1.0 | 0.04 |
| APCT-3: do 3 tests | 8 Nov | 1615 | 8 Nov | 1700 | 0.8 | 0.03 |
| APC core without orientation: 0–90 mbsf; spud hole at 1700 h | 8 Nov | 1700 | 9 Nov | 0845 | 15.8 | 0.66 |
| APCT-3 temperatures taken on Cores 3H–5H (not on 6H); poor recovery/quality for Cores 3H–5H; abandon temperature measurements | ||||||
| Rehead core line after Core 5H (~1 h) | ||||||
| Change seals after Core 6H | ||||||
| Change coring system (will take 1 h); basement = 90 mbsf | 9 Nov | 0845 | 9 Nov | 0945 | 1.0 | 0.04 |
| XCB core basement: 90–98.8 mbsf at 8 m/h | 9 Nov | 0945 | 9 Nov | 1230 | 2.8 | 0.11 |
| Trip with top drive: from 98.8 to 7.8 mbsf at 4 stands/h | 9 Nov | 1230 | 9 Nov | 1315 | 0.8 | 0.03 |
| Clear seafloor at 1310 h | ||||||
| Hole U1382B totals: | 8 Nov | 1445 | 9 Nov | 1315 | 22.5 | 0.94 |
| Transit to Hole U1384A | 9 Nov | 1315 | 9 Nov | 1815 | 5.0 | 0.21 |
| Hole U1384A: APC core to basement, XCB core basement contact | ||||||
| Pick up top drive and space out drill pipe (will take 1 h) | 9 Nov | 1815 | 9 Nov | 1915 | 1.0 | 0.04 |
| Correct PDR depth of 4444.5 mbrf; set bit at 4440 mbrf for mudline core | ||||||
| Deploy APC core barrel (will take 0.5 h) | 9 Nov | 1915 | 9 Nov | 1945 | 0.5 | 0.02 |
| Recover water core (will take 0.5 h) | 9 Nov | 1945 | 9 Nov | 2030 | 0.8 | 0.03 |
| Determine original PDR depth in error (will take 0.5 h); new PDF depth = 4475.4 mbsf | 9 Nov | 2030 | 9 Nov | 2045 | 0.3 | 0.01 |
| Set bit at 4471 mbrf for mudline core | ||||||
| Run into hole to 4471.0 mbrf (will take 0.5 h) | 9 Nov | 2045 | 9 Nov | 2100 | 0.2 | 0.01 |
| Deploy APC core barrel (will take 0.5 h) | 9 Nov | 2100 | 9 Nov | 2130 | 0.5 | 0.02 |
| Spud Hole U1384A at 2125 h | ||||||
| APC core without orientation: 0–95 mbsf | 9 Nov | 2130 | 10 Nov | 1045 | 13.2 | 0.55 |
| Change coring system (will take 1 h) | 10 Nov | 1045 | 10 Nov | 1100 | 0.3 | 0.01 |
| XCB core sediment: 95–96 mbsf at 1 m/h; final depth = 96.2 mbsf | 10 Nov | 1100 | 10 Nov | 1300 | 2.0 | 0.08 |
| Set back top drive (will take 0.5 h) | 10 Nov | 1300 | 10 Nov | 1330 | 0.5 | 0.02 |
| Clear seafloor at 1345 h | ||||||
| Trip: depth to surface: from 96 mbsf to surface, ±1.5 h in 4476 m of water | 10 Nov | 1330 | 10 Nov | 2000 | 6.5 | 0.27 |
| Handle BHA (will take 2 h) | 10 Nov | 2000 | 10 Nov | 2200 | 2.0 | 0.08 |
| Lay out drill collars (will take 2 h) | 10 Nov | 2200 | 10 Nov | 2300 | 1.0 | 0.04 |
| Secure for transit (will take 1.25 h) | 10 Nov | 2300 | 11 Nov | 0015 | 1.2 | 0.05 |
| Pull bow thruster and switch over from dynamic positioning to bridge control (will take 0.5 h) | 11 Nov | 0015 | 11 Nov | 0045 | 0.5 | 0.02 |
| Hole U1384A totals: | 9 Nov | 1815 | 11 Nov | 0045 | 30.5 | 1.27 |
Operations included advanced piston coring (APC) of sediment overlying basement and extended core barrel (XCB) coring of the sediment/basement contact. Times are local ship time, which is Universal Time Coordinated (UTC) – 3 h. BHA = bottom-hole assembly. APCT-3 = advanced piston corer temperature tool. PDR = precision depth recorder.
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