Table T1. Summary of operations, Hole 395A. Operations included (A) retrieving existing Hole 395A CORK and 600 m long thermistor string installed in 1997, (B) downhole logging with the microbiology tool string (Deep Exploration Biosphere Investigative tool [DEBI-t]), and (C) installing a new multilevel subseafloor borehole observatory (CORK).
| Operational task | Start | End | ||||
|---|---|---|---|---|---|---|
|
Date (2011) |
Time (h) |
Date (2011) |
Time (h) |
Task time | ||
| Hours | Days | |||||
| (A) Retrieve existing Hole 395A CORK | ||||||
| End sea voyage/lower thrusters and hydrophones | 20 Sep | 2330 | 21 Sep | 0030 | 1.00 | 0.04 |
| Clear riser hatch, remove crossover sub, make up to CORK pulling tool | 21 Sep | 0030 | 21 Sep | 0200 | 1.50 | 0.06 |
| Remove and lay out upper guide horn | 21 Sep | 0200 | 21 Sep | 0300 | 1.00 | 0.04 |
| Pick up and make up CORK pulling tool, replace bushings, hang in slips | 21 Sep | 0300 | 21 Sep | 0330 | 0.50 | 0.02 |
| Install mousehole, assemble stabber, install bales and elevators | 21 Sep | 0330 | 21 Sep | 0415 | 0.75 | 0.03 |
| Pick up single drill collar | 21 Sep | 0415 | 21 Sep | 0430 | 0.25 | 0.01 |
| Open moonpool doors; blown hydraulic hose | 21 Sep | 0430 | 21 Sep | 0515 | 0.75 | 0.03 |
| Pick up drill collars | 21 Sep | 0515 | 21 Sep | 0630 | 1.25 | 0.05 |
| Handle bottom-hole assembly | 21 Sep | 0630 | 21 Sep | 0630 | 0.00 | 0.00 |
| Trip: surface to mudline, plus 0 h in 4481 m of water | 21 Sep | 0630 | 21 Sep | 1530 | 9.00 | 0.38 |
| Trip: drift tubulars/strap (measure) drill pipe, plus 3 h in 4481 m of water | 21 Sep | 1530 | 21 Sep | 1530 | 0.00 | 0.00 |
| Pick up top drive and space out drill pipe | 21 Sep | 1530 | 21 Sep | 1600 | 0.50 | 0.02 |
| Repair VIT camera system winch hydraulics | 21 Sep | 1600 | 22 Sep | 1645 | 24.75 | 1.03 |
| Deploy VIT camera system to seafloor | 22 Sep | 1645 | 22 Sep | 1900 | 2.25 | 0.09 |
| Space out drill pipe/install sinker bars | 22 Sep | 1900 | 22 Sep | 2000 | 1.00 | 0.04 |
| Maneuver ship for reentry | 22 Sep | 2000 | 22 Sep | 2045 | 0.75 | 0.03 |
| Verify CORK engagement/pick up drill pipe 5 m | 22 Sep | 2045 | 22 Sep | 2100 | 0.25 | 0.01 |
| Run in hole with sinker bars/engage and recover thermistor string | 22 Sep | 2100 | 22 Sep | 2200 | 1.00 | 0.04 |
| Apparent 200 lb weight gain; however, no thermistor string recovered at surface on first attempt | ||||||
| Run in hole with sinker bars/engage and recover thermistor string | 22 Sep | 2200 | 22 Sep | 2315 | 1.25 | 0.05 |
| Again apparent weight gain; however, no thermistor string on second attempt; overshot latch fingers not engaging—likely because of detritus over pulling neck | ||||||
| Handle VIT camera system | 22 Sep | 2315 | 22 Sep | 2330 | 0.25 | 0.01 |
| Run in hole with sinker bars/engage and recover thermistor string | 22 Sep | 2330 | 23 Sep | 0100 | 1.50 | 0.06 |
| Still no CORK recovery despite circulation and heavier jar force; abandon attempt to recover thermistor string with wireline | ||||||
| Lay out sinker bars | 23 Sep | 0100 | 23 Sep | 0115 | 0.25 | 0.01 |
| Set back top drive | 23 Sep | 0115 | 23 Sep | 0145 | 0.50 | 0.02 |
| Lay out knobbies/drill pipe and space out for max reentry cone clearance | 23 Sep | 0145 | 23 Sep | 0200 | 0.25 | 0.01 |
| Trip: mudline to surface, plus 0 h in 4481 m of water | 23 Sep | 0200 | 23 Sep | 0930 | 7.50 | 0.31 |
| Handle bottom-hole assembly | 23 Sep | 0930 | 23 Sep | 1030 | 1.00 | 0.04 |
| Remove ROV platform in moonpool | 23 Sep | 1030 | 23 Sep | 1130 | 1.00 | 0.04 |
| Remove long recovery tool | 23 Sep | 1130 | 23 Sep | 1215 | 0.75 | 0.03 |
| Retrieve data logger at surface | 23 Sep | 1215 | 23 Sep | 1530 | 3.25 | 0.14 |
| Lay out Hole 395A CORK and stinger | 23 Sep | 1530 | 23 Sep | 1700 | 1.50 | 0.06 |
| (B) Downhole microbiology logging (DEBI-t) | ||||||
| Handle bottom-hole assembly | 23 Sep | 1700 | 23 Sep | 1800 | 1.00 | 0.04 |
| Trip: depth to depth, from (mudline) 0 to 2000 mbsf, plus 0 h in 4481 m of water | 23 Sep | 1800 | 23 Sep | 2045 | 2.75 | 0.11 |
| Handle VIT camera system | 23 Sep | 2045 | 23 Sep | 2100 | 0.25 | 0.01 |
| Trip: depth to mudline, from 2000 mbsf to mudline, ±0.5 h | 23 Sep | 2100 | 24 Sep | 0100 | 4.00 | 0.17 |
| Check pipe tally and space out for reentry | 24 Sep | 0100 | 24 Sep | 0115 | 0.25 | 0.01 |
| Maneuver ship for reentry | 24 Sep | 0115 | 24 Sep | 0130 | 0.25 | 0.01 |
| Trip: mudline to depth (4550 mbrf; 56 mbsf), from 0 to 56 mbsf, plus 0 h; including space out for logging and spotting log tool pallet | 24 Sep | 0130 | 24 Sep | 0200 | 0.50 | 0.02 |
| Handle VIT camera system | 24 Sep | 0200 | 24 Sep | 0200 | 0.00 | 0.00 |
| Rig up special triple combo tool string for temperature and DEBI-t microbiological scanning | ||||||
| Rig up | 24 Sep | 0200 | 24 Sep | 0500 | 3.00 | 0.13 |
| Triple combo: log from 56 to 110 mbsf at 200 m/h | 24 Sep | 0500 | 24 Sep | 1500 | 10.00 | 0.42 |
| POOH with logging line to clean hole | 24 Sep | 1500 | 24 Sep | 1430 | –0.50 | –0.02 |
| Bridge at 4670 mbrf would not pass logging tool string; POOH | ||||||
| Run in hole with logging bit to clear bridge | 24 Sep | 1430 | 24 Sep | 1530 | 1.00 | 0.04 |
| Rig up | 24 Sep | 1530 | 24 Sep | 1615 | 0.75 | 0.03 |
| Triple combo: log from 56 to 590 mbsf at 200 m/h (up, down, plus double passes) | 24 Sep | 1615 | 25 Sep | 0300 | 10.75 | 0.45 |
| Rig down | 25 Sep | 0300 | 25 Sep | 0400 | 1.00 | 0.04 |
| Hole 395A depth check (without circulation or rotation) | ||||||
| Move bit from 56 to 196 mbsf, which will take 0 h | 25 Sep | 0400 | 25 Sep | 0400 | 0.00 | 0.00 |
| Trip: log depth to depth, from logging depth of 196 mbsf to 600 mbsf; no problem running drill pipe to 600 m without circulation or rotation | 25 Sep | 0400 | 25 Sep | 0500 | 1.00 | 0.04 |
| Trip: depth to mudline, from 600 mbsf to mudline, plus 0.5 h | 25 Sep | 0500 | 25 Sep | 0615 | 1.25 | 0.05 |
| Trip: mudline to surface, plus 0 h in 4481 m of water | 25 Sep | 0615 | 25 Sep | 1200 | 5.75 | 0.24 |
| Handle bottom-hole assembly | 25 Sep | 1200 | 25 Sep | 1230 | 0.50 | 0.02 |
| Slip/Cut drill line | 25 Sep | 1230 | 25 Sep | 1345 | 1.25 | 0.05 |
| Repair iron roughneck hydraulic hose | 25 Sep | 1345 | 25 Sep | 1415 | 0.50 | 0.02 |
| (C) Install new multilevel CORK | ||||||
| Make up 3 stands of perforated 6.75 inch drill collars, plus 1 joint of perforated steel 5.5 inch casing | 25 Sep | 1415 | 25 Sep | 1800 | 3.75 | 0.16 |
| Rig up umbilicals, attach miniscreens, prep for make up 4.5 inch casing | 25 Sep | 1800 | 25 Sep | 1915 | 1.25 | 0.05 |
| Deploy 2 joints of 4.5 inch fiberglass casing | 25 Sep | 1915 | 25 Sep | 2015 | 1.00 | 0.04 |
| Lost 1.5 h grinding 4.5 inch casing elevators to fit fiberglass pipe | 25 Sep | 2015 | 25 Sep | 2245 | 2.50 | 0.10 |
| Deploy 2 joints of 4.5 inch fiberglass casing | 25 Sep | 2245 | 25 Sep | 2330 | 0.75 | 0.03 |
| Make up packer assembly No. 1 | ||||||
| Make up fiberglass to steel crossover | 25 Sep | 2330 | 25 Sep | 2345 | 0.25 | 0.01 |
| Make up landing sub No. 1 | 25 Sep | 2345 | 26 Sep | 0000 | 0.25 | 0.01 |
| Make up packer No. 1 (B-1) | 26 Sep | 0000 | 26 Sep | 0015 | 0.25 | 0.01 |
| Make up steel to fiberglass casing crossover | 26 Sep | 0015 | 26 Sep | 0030 | 0.25 | 0.01 |
| Make up 1 joint of 4.5 inch fiberglass casing and lower packer to moonpool | 26 Sep | 0030 | 26 Sep | 0045 | 0.25 | 0.01 |
| Connect umbilicals to upper and lower ends of packer | 26 Sep | 0045 | 26 Sep | 0215 | 1.50 | 0.06 |
| Make up 2.96 m 4.5 inch fiberglass casing pup | 26 Sep | 0215 | 26 Sep | 0230 | 0.25 | 0.01 |
| Make up and deploy 4.5 inch fiberglass casing | ||||||
| Make up 4 joints of 4.5 inch fiberglass casing | 26 Sep | 0230 | 26 Sep | 0330 | 1.00 | 0.04 |
| Install 3(?) miniscreens | 26 Sep | 0330 | 26 Sep | 0445 | 1.25 | 0.05 |
| Make up 1 joint of 4.5 inch fiberglass casing plus one 2.96 m casing pup | 26 Sep | 0445 | 26 Sep | 0515 | 0.50 | 0.02 |
| Make up 29 joints of 4.5 inch fiberglass casing | 26 Sep | 0515 | 26 Sep | 0930 | 4.25 | 0.18 |
| Make up packer assembly No. 2 | ||||||
| Make up fiberglass to steel crossover | 26 Sep | 0930 | 26 Sep | 0945 | 0.25 | 0.01 |
| Make up landing sub No. 2 | 26 Sep | 0945 | 26 Sep | 1000 | 0.25 | 0.01 |
| Make up packer No. 2 (B-2) | 26 Sep | 1000 | 26 Sep | 1015 | 0.25 | 0.01 |
| Make up steel to fiberglass casing crossover | 26 Sep | 1015 | 26 Sep | 1030 | 0.25 | 0.01 |
| Make up 1 joint of 4.5 inch fiberglass casing and lower packer to moonpool | 26 Sep | 1030 | 26 Sep | 1030 | 0.00 | 0.00 |
| Connect umbilicals to upper and lower ends of packer | 26 Sep | 1030 | 26 Sep | 1245 | 2.25 | 0.09 |
| Make up and deploy 4.5 inch fiberglass casing | ||||||
| Make up 1.74 m fiberglass pup | 26 Sep | 1245 | 26 Sep | 1245 | 0.00 | 0.00 |
| Make up 3 joints of 4.5 inch fiberglass casing | 26 Sep | 1245 | 26 Sep | 1315 | 0.50 | 0.02 |
| Make up 1.74 m fiberglass pup | 26 Sep | 1315 | 26 Sep | 1330 | 0.25 | 0.01 |
| 4.5 inch elevator fit up for steel casing elevators | 26 Sep | 1330 | 26 Sep | 1400 | 0.50 | 0.02 |
| Makeup packer assembly No. 3 | ||||||
| Make up fiberglass to steel crossover | 26 Sep | 1400 | 26 Sep | 1415 | 0.25 | 0.01 |
| Make up landing sub No. 3 | 26 Sep | 1415 | 26 Sep | 1430 | 0.25 | 0.01 |
| Make up packer No. 3 (C-1) | 26 Sep | 1430 | 26 Sep | 1445 | 0.25 | 0.01 |
| Make up 1 pup joint of 3 m steel casing | 26 Sep | 1445 | 26 Sep | 1500 | 0.25 | 0.01 |
| Make up 1 joint of 4.5 inch steel casing | 26 Sep | 1500 | 26 Sep | 1500 | 0.00 | 0.00 |
| Lower packer No. 3 into moonpool | 26 Sep | 1500 | 26 Sep | 1500 | 0.00 | 0.00 |
| Connect umbilicals to upper and lower ends of packer | 26 Sep | 1500 | 26 Sep | 1730 | 2.50 | 0.10 |
| Make up and deploy 4.5 inch steel casing | ||||||
| Make up 6 joints of 4.5 inch steel casing | 26 Sep | 1730 | 26 Sep | 1845 | 1.25 | 0.05 |
| Make up L-CORK head and running tool | ||||||
| Make up running tool to L-CORK head | 26 Sep | 1845 | 26 Sep | 1930 | 0.75 | 0.03 |
| Make-up L-CORK head to top of 4.5 inch steel casing string and lower into moonpool | 26 Sep | 1930 | 26 Sep | 2000 | 0.50 | 0.02 |
| Cut umbilicals to length and make up final connections to L-CORK head | 26 Sep | 2000 | 26 Sep | 2100 | 1.00 | 0.04 |
| Rig down moonpool work area/open doors/pull bushings | 26 Sep | 2100 | 26 Sep | 2130 | 0.50 | 0.02 |
| Attach packer/inflate hose and safety line from running tool to CORK head/lower to moonpool | 26 Sep | 2130 | 26 Sep | 2145 | 0.25 | 0.01 |
| Install bushings at rig floor | 26 Sep | 2145 | 26 Sep | 2200 | 0.25 | 0.01 |
| Pickup first stand of drill collars | 26 Sep | 2200 | 26 Sep | 2215 | 0.25 | 0.01 |
| Lower/Raise CORK below keel to purge air from all lines | 26 Sep | 2215 | 26 Sep | 2245 | 0.50 | 0.02 |
| Install osmo pump/check all valve positions and secure with rubber bands | 26 Sep | 2245 | 26 Sep | 2330 | 0.75 | 0.03 |
| Remove moonpool work platform and open moonpool doors | 26 Sep | 2330 | 27 Sep | 0000 | 0.50 | 0.02 |
| Test-fit VIT camera system sleeve over CORK | 27 Sep | 0000 | 27 Sep | 0030 | 0.50 | 0.02 |
| Make up remainder of bottom-hole assembly and run in hole with 2 stands of 5.5 inch transition pipe | 27 Sep | 0030 | 27 Sep | 0100 | 0.50 | 0.02 |
| Make up and deploy instrument string | ||||||
| Make up instrument string and top plug | 27 Sep | 0100 | 27 Sep | 0400 | 3.00 | 0.13 |
| Deploy instrument string (attempt to land top plug was unsuccessful) | 27 Sep | 0400 | 27 Sep | 0500 | 1.00 | 0.04 |
| Inspect latch (all appeared okay, except for significant pipe dope), rezero line counter | ||||||
| Deploy instrument string for second time and attempt to land top plug; shear overshot pin on 2nd attempt | 27 Sep | 0500 | 27 Sep | 0545 | 0.75 | 0.03 |
| Replace pin/redeploy overshot and engage latch assembly/test latch engagement | 27 Sep | 0545 | 27 Sep | 0645 | 1.00 | 0.04 |
| Run in, attempt to latch, shear off, repair CORK, POOH (note that trip was shorter for reentry because of 530 m casing below running tool) | 27 Sep | 0645 | 27 Sep | 1145 | 5.00 | 0.21 |
| Trip: surface to mudline (3/4 speed), plus 0 h in 4481 m of water; fill pipe every 30 stands (15–20 min per fill) | 27 Sep | 1145 | 27 Sep | 1915 | 7.50 | 0.31 |
| Handle VIT camera system | 27 Sep | 1915 | 27 Sep | 1945 | 0.50 | 0.02 |
| Maneuver ship for reentry | 27 Sep | 1945 | 27 Sep | 2000 | 0.25 | 0.01 |
| Reenter Hole 395A with L-CORK at 2003 h | ||||||
| Run in hole with CORK stinger assembly and L-CORK to 5000 m | 27 Sep | 2000 | 27 Sep | 2245 | 2.75 | 0.11 |
| Pick up top drive | 27 Sep | 2245 | 27 Sep | 2315 | 0.50 | 0.02 |
| Run in hole with CORK stinger assembly, open compensator, and land L-CORK | 27 Sep | 2315 | 28 Sep | 0000 | 0.75 | 0.03 |
| Pressure up drill string and inflate CORK packers | 28 Sep | 0000 | 28 Sep | 0030 | 0.50 | 0.02 |
| Recover VIT camera system from seafloor | 28 Sep | 0030 | 28 Sep | 0200 | 1.50 | 0.06 |
| Assemble and deploy ROV platform | ||||||
| Assemble ROV platform on moonpool and install “lunar lander” platform deployment tool/rig VIT camera system slings | 28 Sep | 0200 | 28 Sep | 0400 | 2.00 | 0.08 |
| Handle VIT camera system | 28 Sep | 0400 | 28 Sep | 0430 | 0.50 | 0.02 |
| Deploy VIT camera system to seafloor | 28 Sep | 0430 | 28 Sep | 0630 | 2.00 | 0.08 |
| Land and release ROV platform; attempt to release CORK running tool from CORK head from 0644 to 0734 h | 28 Sep | 0630 | 28 Sep | 0734 | 1.07 | 0.04 |
| Recover VIT camera system from seafloor | 28 Sep | 0734 | 28 Sep | 0930 | 1.93 | 0.08 |
| Remove ROV platform deployment slings and run in hole with VIT camera system | 28 Sep | 0930 | 28 Sep | 1130 | 2.00 | 0.08 |
| Inspect L-CORK installation (found CORK broken) | 28 Sep | 1130 | 28 Sep | 1145 | 0.25 | 0.01 |
| Trip: mudline to surface, plus 0 h in 4481 m of water | 28 Sep | 1145 | 28 Sep | 1930 | 7.75 | 0.32 |
| Handle VIT camera system | 28 Sep | 1930 | 28 Sep | 1830 | –1.00 | –0.04 |
| Handle bottom-hole assembly | 28 Sep | 1830 | 28 Sep | 1845 | 0.25 | 0.01 |
| Inspect CORK, remove OsmoSamplers, lay out to core technician shop roof | 28 Sep | 1845 | 28 Sep | 2015 | 1.50 | 0.06 |
| Rig down CORK running tool and close stabber | 28 Sep | 2015 | 28 Sep | 2030 | 0.25 | 0.01 |
| Install upper guide horn and secure moonpool | 28 Sep | 2030 | 28 Sep | 2245 | 2.25 | 0.09 |
| Lay out drill collars | 28 Sep | 2245 | 29 Sep | 0000 | 1.25 | 0.05 |
| Review 2400 h weather report/make decision on when and where to move because of Tropical Storm Philippe | 29 Sep | 0000 | 29 Sep | 0000 | 0.00 | 0.00 |
| Secure for transit | 29 Sep | 0000 | 29 Sep | 0130 | 1.50 | 0.06 |
| Pull thrusters and hydrophone; begin sea voyage at 0218 h 29 September 2011 | 29 Sep | 0130 | 29 Sep | 0215 | 0.75 | 0.03 |
| Hole 395A totals: | 20 Sep | 2330 | 29 Sep | 0215 | 194.75 | 8.11 |
Times are given in local ship time, which is Universal Time Coordinated (UTC) – 3 h for all on-site operations. VIT = vibration-isolated television, ROV = remotely operated vehicle, triple combo = triple combination, POOH = pull out of hole, L-CORK = lateral CORK.
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