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Table T1. Summary of operations, Hole U1382A. Operations included (A) installing a reentry cone with 53 m of 16 inch casing, (B) drilling a 14.75 inch hole, (C) installing/cementing 10.75 inch casing, (D) RCB coring, (E) downhole logging and packer experiments, and (F) installing a new subseafloor borehole observatory (CORK).

Operational task Start End Task time
Date
(2011)
Time
(h)
Date
(2011)
Time
(h)
Hours Days
(A) Start round-trip for Hole U1382A: install reentry cone and 16 inch casing
Install reentry cone 1 Oct 1230 1 Oct 1400 1.50 0.06
Handle BHA 1 Oct 1400 1 Oct 1500 1.00 0.04
Rig up/down for casing 1 Oct 1500 1 Oct 1545 0.75 0.03
Case with 16 inch casing from 0 to 53 mbsf at 3 joints/h, plus 0 h 1 Oct 1545 1 Oct 1730 1.75 0.07
Rig up/down for casing 1 Oct 1730 1 Oct 1730 0.00 0.00
Make up DQ running tool and replace master bushings 1 Oct 1730 1 Oct 1830 1.00 0.04
Pick up drill collars 1 Oct 1830 1 Oct 1915 0.75 0.03
Pull master bushings/lower and engage DQ running tool with reentry cone 1 Oct 1915 1 Oct 1945 0.50 0.02
Pick up reentry cone and open moonpool doors/lower reentry cone 1 Oct 1945 1 Oct 2030 0.75 0.03
Pick up tapered drill collar and 2 stands of 5.5 inch transition drill pipe 1 Oct 2030 1 Oct 2115 0.75 0.03
Damaged face on top joint of 5.5 inch transition drill pipe; lay out 2 stands and replace with 2 new stands of 5.5 inch transition drill pipe            
Trip: surface to mudline, plus 0.75 h in 4494 m of water 1 Oct 2115 2 Oct 0630 9.25 0.39
Repair broken hydraulic hose on iron roughneck after RIH with 2 stands of 5 inch drill pipe            
Install float valve in BHA—pipe trip slowed for periodic pipe filling            
Deploy camera system at 70 stands while RIH with drill string 2 Oct 0630 2 Oct 0700 0.50 0.02
Pick up top drive and space out drill pipe 2 Oct 0700 2 Oct 0745 0.75 0.03
Jet-in casing (takes 5 h) 2 Oct 0745 2 Oct 1030 2.75 0.11
Release running tool 2 Oct 1030 2 Oct 1030 0.00 0.00
Set back top drive 2 Oct 1030 2 Oct 1100 0.50 0.02
Trip: mudline to surface, plus 0 h in 4494 m of water 2 Oct 1100 2 Oct 1730 6.50 0.27
Recover camera system while POOH with drill string 2 Oct 1730 2 Oct 1800 0.50 0.02
Handle BHA 2 Oct 1800 2 Oct 1930 1.50 0.06
(B) Drill 14.75 inch hole with tricone bit for 10.75 inch casing
Handle BHA 2 Oct 1930 2 Oct 2000 0.50 0.02
Trip: surface to mudline, plus 0 h in 4494 m of water 2 Oct 2000 3 Oct 0330 7.50 0.31
Maneuver ship for reentry 3 Oct 0330 3 Oct 0345 0.25 0.01
Pick up top drive and space out drill pipe; official reentry time of 0348 h 3 Oct 0345 3 Oct 0415 0.50 0.02
Move bit from (mudline) 0 to 53 mbsf 3 Oct 0415 3 Oct 0445 0.50 0.02
Handle camera system 3 Oct 0445 3 Oct 0530 0.75 0.03
Drill ahead sediment to basement: 53–91 mbsf at 30 m/h 3 Oct 0530 3 Oct 0715 1.75 0.07
Drill ahead basement: 91–110 mbsf at 5 m/h 3 Oct 0715 3 Oct 1200 4.75 0.20
Circulation 3 Oct 1200 3 Oct 1245 0.75 0.03
Basement at ~90 mbsf            
Wiper trip: 110 to 60 mbsf and back 3 Oct 1245 3 Oct 1315 0.50 0.02
Circulation 3 Oct 1315 3 Oct 1515 2.00 0.08
Set back top drive (clear seafloor at 1605 h) 3 Oct 1515 3 Oct 1545 0.50 0.02
Trip: depth to surface: 110 mbsf to surface, plus 0 h in 4494 m of water 3 Oct 1545 3 Oct 2230 6.75 0.28
Handle BHA 3 Oct 2230 3 Oct 2300 0.50 0.02
(C) Make up and install 10.75 inch casing to 102 mbsf
Make up stand with DQ running tool and stand back in derrick 3 Oct 2300 3 Oct 2330 0.50 0.02
Slip/Cut drill line 3 Oct 2330 4 Oct 0130 2.00 0.08
Rig up/down for casing 4 Oct 0130 4 Oct 0215 0.75 0.03
Case with 10.75 inch casing from 0 to 102 mbsf at 4 joints/h, plus 0 h 4 Oct 0215 4 Oct 0445 2.50 0.10
Make up 10.75 inch casing hanger and weld coupling/weld all casing couplings 4 Oct 0445 4 Oct 0500 0.25 0.01
Make up DQ running tool to casing hanger/pull bushings/lower though rotary table 4 Oct 0500 4 Oct 0600 1.00 0.04
Make up 2 stands of 8.25 inch drill collars 4 Oct 0600 4 Oct 0615 0.25 0.01
Trip: surface to mudline, plus 0 h in 4494 m of water 4 Oct 0615 4 Oct 1300 6.75 0.28
Handle camera system 4 Oct 1300 4 Oct 1330 0.50 0.02
Maneuver ship for reentry; reenter at 1355 h 4 Oct 1330 4 Oct 1400 0.50 0.02
Pick up top drive and space out drill pipe 4 Oct 1400 4 Oct 1430 0.50 0.02
RIH with 10.75 inch casing/land casing hanger (land at 1515 h) 4 Oct 1430 4 Oct 1515 0.75 0.03
Cement casing shoe 4 Oct 1515 4 Oct 1700 1.75 0.07
Release cone/casing hanger 4 Oct 1700 4 Oct 1715 0.25 0.01
Displace drill pipe and perform survey of Hole 395A reentry cone 4 Oct 1715 4 Oct 1815 1.00 0.04
Trip: depth to surface: (mudline) 0 mbsf to surface, plus 1.25 h in 4494 m of water 4 Oct 1815 5 Oct 0100 6.75 0.28
Recover camera system 5 Oct 0100 5 Oct 0130 0.50 0.02
Handle BHA 5 Oct 0130 5 Oct 0215 0.75 0.03
De-torque DQ running tool and prepare to make up RCB coring assembly 5 Oct 0215 5 Oct 0300 0.75 0.03
(D) RCB coring
Make up RCB core barrel/center bit assembly 5 Oct 0300 5 Oct 0400 1.00 0.04
Make up C-7 RCB core bit and outer core barrel assembly 5 Oct 0400 5 Oct 0500 1.00 0.04
Space out core barrels 5 Oct 0500 5 Oct 0530 0.50 0.02
Install center bit 5 Oct 0530 5 Oct 0600 0.50 0.02
Handle BHA 5 Oct 0600 5 Oct 0700 1.00 0.04
Trip: surface to mudline, plus 0 h in 4494 m of water 5 Oct 0700 5 Oct 1300 6.00 0.25
Handle camera system 5 Oct 1300 5 Oct 1330 0.50 0.02
Maneuver ship for reentry; reenter at 1337 h 5 Oct 1330 5 Oct 1330 0.00 0.00
Handle camera system 5 Oct 1330 5 Oct 1430 1.00 0.04
Trip: mudline to depth: 0–87 mbsf, plus 0 h 5 Oct 1430 5 Oct 1445 0.25 0.01
Pick up top drive and space out drill pipe 5 Oct 1445 5 Oct 1515 0.50 0.02
Tag cement 14 m above casing shoe at 88 mbsf or 4582 mbrf            
Slow circulation (SCR) 5 Oct 1515 5 Oct 1530 0.25 0.01
Drill out cement: 87–110 mbsf at 10 m/h, or 0 h 5 Oct 1530 5 Oct 1745 2.25 0.09
Circulation will take 1.25 h 5 Oct 1745 5 Oct 1900 1.25 0.05
Recover RCB center bit 5 Oct 1900 5 Oct 2015 1.25 0.05
Check core barrel spaceout against center bit spaceout 5 Oct 2015 5 Oct 2045 0.50 0.02
Pump down RCB core barrel and record SCRs 5 Oct 2045 5 Oct 2115 0.50 0.02
RCB core basement: 110.0–113.3 mbsf at 5 m/h; Core 336-U1382A-2R on deck at 2245 h 5 Oct 2115 5 Oct 2245 1.50 0.06
RCB core basement: 113.3–122.9 mbsf at 5 m/h; Core 336-U1382A-3R on deck at 0525 h 5 Oct 2245 6 Oct 0530 6.75 0.28
RCB core basement: 122.9–132.5 mbsf at 5 m/h; Core 336-U1382A-4R on deck at 0910 h 6 Oct 0530 6 Oct 0915 3.75 0.16
RCB core basement: 132.5–142.1 mbsf at 5 m/h; Core 336-U1382A-5R on deck at 1220 h 6 Oct 0915 6 Oct 1215 3.00 0.13
RCB core basement: 142.1–151.7 mbsf at 5 m/h; Core 336-U1382A-6R on deck at 1555 h 6 Oct 1215 6 Oct 1600 3.75 0.16
RCB core basement: 151.7–161.3 mbsf at 3 m/h; Core 336-U1382A-7R on deck at 2045 h 6 Oct 1600 6 Oct 2045 4.75 0.20
Work drill string (hole trouble on Core 7R) 6 Oct 2045 6 Oct 2130 0.75 0.03
Trip: wiper trip: 161.3 mbsf to 102 mbsf and back 6 Oct 2130 7 Oct 0015 2.75 0.11
Circulation 7 Oct 0015 7 Oct 0100 0.75 0.03
Deploy core barrel 7 Oct 0100 7 Oct 0130 0.50 0.02
RCB core basement: 161.3–170.9 mbsf at 4 m/h; Core 336-U1382A-8R on deck at 0415 h 7 Oct 0130 7 Oct 0415 2.75 0.11
RCB core basement: 170.9–180.5 mbsf at 4 m/h; Core 336-U1382A-9R on deck at 0905 h 7 Oct 0415 7 Oct 0900 4.75 0.20
RCB core basement: 180.5–190.1 mbsf at 4 m/h; Core 336-U1382A-10R on deck at 1325 h 7 Oct 0900 7 Oct 1330 4.50 0.19
RCB core basement: 190.1–199.7 mbsf at 4 m/h; Core 336-U1382A-11R on deck at 1710 h 7 Oct 1330 7 Oct 1715 3.75 0.16
RCB core basement: 199.7–210 mbsf at 4 m/h 7 Oct 1715 7 Oct 2130 4.25 0.18
Circulation 7 Oct 2130 7 Oct 2200 0.50 0.02
RIH with wireline and recover Core 336-U1382A-12R; on deck at 2320 h 7 Oct 2200 7 Oct 2330 1.50 0.06
Planning used 5 m/h based on ROP for first 100 m of basement in Hole 395A while coring; actual round-trip wireline time was ~1.5 h            
Problem with stabbing sinker bars delayed going after Core 3R until ~0400 h            
Wiper trip 1: 210–80 mbsf and back; a couple of tight spots—likely bridges but not bad overall 7 Oct 2330 8 Oct 0130 2.00 0.08
Circulation 8 Oct 0130 8 Oct 0200 0.50 0.02
Wiper trip 2: 210–80 mbsf and back; all good (lowered without rotation or circulation)—no fill, bridges, or ledges; flush hole with high-vis mud followed with 2 volumes of saltwater 8 Oct 0200 8 Oct 0245 0.75 0.03
Circulation 8 Oct 0245 8 Oct 0330 0.75 0.03
Wiper trip 3: 210–80 mbsf and back (without circulation or rotation; ultimately required rotation and circulation); tagged bridges at 4663, 4666, 4677, and 4682 m; no fill on bottom 8 Oct 0330 8 Oct 0500 1.50 0.06
This time no circulation on bottom            
Pull back above 4663 mbrf; lower with no pump or circulation            
Wiper trip 4: 210–80 mbsf and back 8 Oct 0500 8 Oct 0530 0.50 0.02
Attempt final wiper trip to/from casing shoe without circulation or rotation; if successful, POOH without additional circulation            
Wiper trip 5: 210–80 mbsf and back 8 Oct 0530 8 Oct 0630 1.00 0.04
Set back top drive 8 Oct 0630 8 Oct 0715 0.75 0.03
Trip: depth to surface: 210 mbsf to surface, plus 0 h in 4494 m of water; clear seafloor at 0729 h 8 Oct 0715 8 Oct 1400 6.75 0.28
Handle BHA 8 Oct 1400 8 Oct 1430 0.50 0.02
Clear rotary table at 1430 h            
Make up and paint 6.75 inch stand of perforated drill collar for CORK (will take 2 h) 8 Oct 1430 8 Oct 1645 2.25 0.09
(E) Downhole logging, packer experiment, and hole depth check
Handle BHA 8 Oct 1645 8 Oct 1745 1.00 0.04
Trip: surface to mudline, plus 1.25 h in 4494 m of water 8 Oct 1745 9 Oct 0000 6.25 0.26
Handle camera system 9 Oct 0000 9 Oct 0030 0.50 0.02
Rig up circulating head/pump pig to clear pipe of any rust 9 Oct 0030 9 Oct 0100 0.50 0.02
Rig down circulating head/spaceout for reentry 9 Oct 0100 9 Oct 0130 0.50 0.02
Maneuver ship for reentry; reenter Hole U1382A at 0138 h 9 Oct 0130 9 Oct 0145 0.25 0.01
Trip: mudline to depth: 0–60 mbsf, plus 0.25 h 9 Oct 0145 9 Oct 0200 0.25 0.01
Rig up 9 Oct 0200 9 Oct 0300 1.00 0.04
Triple combo with DEBI-t: log 60–250 mbsf at 275 m/h; power failure downhole on logging tools; back to surface after almost completing first pass 9 Oct 0300 9 Oct 1215 9.25 0.39
FMS-sonic: log 60–250 mbsf at 275 m/h 9 Oct 1215 9 Oct 2100 8.75 0.36
FMS tools unable to reenter drill pipe—problems started at ~1612 h; tool was freed at 1815 h; nothing left in hole—damage consisted of a bent pad on 1 caliper arm            
Rig down 9 Oct 2100 9 Oct 2200 1.00 0.04
Pick up top drive and space out drill pipe 9 Oct 2200 9 Oct 2230 0.50 0.02
Pressure test system 9 Oct 2230 9 Oct 2245 0.25 0.01
Set packer depth 9 Oct 2245 9 Oct 2315 0.50 0.02
Install pressure gauges and deploy packer setting go-devil 9 Oct 2315 10 Oct 0000 0.75 0.03
Stand by 30 min for hydrostatic pressure reference 10 Oct 0000 10 Oct 0030 0.50 0.02
Inflate and lock packer element by setting weight down 10 Oct 0030 10 Oct 0045 0.25 0.01
Packer slipped 3 times. Hold for ~5 min. Fine balance between too much weight down and large heave (2.5–3.0 m)–induced release            
Packer held >10 min but then deflated again; flow testing was abandoned            
Inflate and lock packer element by setting weight down (will take 1.75 h) 10 Oct 0045 10 Oct 0245 2.00 0.08
Wireline trip to get go-devil out of packer (will take 1.75 h); end of drill string packer permeability flow testing 10 Oct 0245 10 Oct 0445 2.00 0.08
Break out pressure gauges and lay out knobby 10 Oct 0445 10 Oct 0500 0.25 0.01
Set back top drive 10 Oct 0500 10 Oct 0515 0.25 0.01
Lower drill string for depth check to total depth of 210 mbsf; passed through problem zone (per caliper log) at 112–132 mbsf twice with no overpull or drag            
Trip: depth to depth: 60–210 mbsf, plus 0.75 h in 4494 m of water 10 Oct 0515 10 Oct 0630 1.25 0.05
Trip: depth to surface: 210 mbsf to surface, plus 0 h in 4494 m of water; clear seafloor at 0655 h 10 Oct 0630 10 Oct 1245 6.25 0.26
Handle BHA (will take 1.25 h) 10 Oct 1245 10 Oct 1330 0.75 0.03
Logging bit cleared rotary table at 1328 h            
Slip and cut drill line 10 Oct 1330 10 Oct 1500 1.50 0.06
(F) Make up CORK observatory
Make up CORK stinger assembly, packer, and 4.5 inch casing, plus umbilicals (will take 7 h) 10 Oct 1500 10 Oct 2200 7.00 0.29
Open stabber, change elevator bales, position CORK head, make up running tool, and make up CORK head to top of casing string 10 Oct 2200 10 Oct 2300 1.00 0.04
Remove bushings and lower CORK head into moonpool for umbilical termination 10 Oct 2300 10 Oct 2315 0.25 0.01
Cut umbilicals to length, install miniscreens, and make up final connections to L-CORK head 10 Oct 2315 11 Oct 0000 0.75 0.03
Hang off CORK head in moonpool on C-plates and elevators 11 Oct 0000 11 Oct 0045 0.75 0.03
Remove CORK running tool 11 Oct 0045 11 Oct 0100 0.25 0.01
Make up and lower OsmoSampler string into CORK            
Make up instrument string and top plug 11 Oct 0100 11 Oct 0200 1.00 0.04
Troubleshoot top plug latch, check release load with strain gauge, and modify latch 11 Oct 0200 11 Oct 0230 0.50 0.02
Spend 37 min to repair damage to iron roughneck track 11 Oct 0230 11 Oct 0315 0.75 0.03
Torque up pup joint on CORK running tool 11 Oct 0315 11 Oct 0315 0.00 0.00
Remove master bushing 11 Oct 0315 11 Oct 0330 0.25 0.01
Make up CORK running tool with CORK head and remove C-plates/open moonpool 11 Oct 0330 11 Oct 0330 0.00 0.00
Attach packer inflate hose and safety line from running tool to CORK head/lower to moonpool 11 Oct 0330 11 Oct 0400 0.50 0.02
Replace bushings at rig floor 11 Oct 0400 11 Oct 0415 0.25 0.01
Pick up first stand of drill collars 11 Oct 0415 11 Oct 0430 0.25 0.01
Inspect valve settings on CORK head prior to “dunking” 11 Oct 0430 11 Oct 0445 0.25 0.01
Open moonpool doors 11 Oct 0445 11 Oct 0445 0.00 0.00
Lower/Raise CORK below keel to purge air from all lines 11 Oct 0445 11 Oct 0500 0.25 0.01
Install osmo pump/check all valve positions and secure with rubber bands 11 Oct 0500 11 Oct 0530 0.50 0.02
Remove grating and open moonpool doors 11 Oct 0530 11 Oct 0545 0.25 0.01
Test-fit camera system sleeve over the CORK 11 Oct 0545 11 Oct 0615 0.50 0.02
Make up remainder of BHA and RIH with 2 stands of 5.5 inch transition pipe 11 Oct 0615 11 Oct 0630 0.25 0.01
Trip: surface to mudline, plus 1 h in 4494 m of water 11 Oct 0630 11 Oct 1530 9.00 0.38
Deploy camera system 11 Oct 1530 11 Oct 1600 0.50 0.02
Maneuver ship for reentry; reenter Hole U1382A at 1630 h 11 Oct 1600 11 Oct 1630 0.50 0.02
Pick up top drive and space out drill pipe 11 Oct 1630 11 Oct 1730 1.00 0.04
Land CORK (1820 h) and inflate packer 11 Oct 1730 11 Oct 1815 0.75 0.03
Deploy ROV platform            
Recover camera system (TV/sonar) from seafloor 11 Oct 1815 11 Oct 2030 2.25 0.09
Assemble ROV platform with camera system 11 Oct 2030 11 Oct 2145 1.25 0.05
Deploy and release ROV platform; platform released and settled over CORK head at 0055 h 11 Oct 2145 12 Oct 0100 3.25 0.14
Recover camera system (TV/sonar) from seafloor 12 Oct 0100 12 Oct 0215 1.25 0.05
Remove deployment slings and platform deployment tool 12 Oct 0215 12 Oct 0230 0.25 0.01
Troubleshoot/repair subsea TV/sonar system 12 Oct 0230 12 Oct 0245 0.25 0.01
Deploy camera system (TV/sonar) to seafloor 12 Oct 0245 12 Oct 0415 1.50 0.06
  12 Oct 0415 12 Oct 0430 0.25 0.01
Pull out of hole            
Set back top drive 12 Oct 0430 12 Oct 0500 0.50 0.02
Trip: mudline to surface, plus 1.25 h in 4494 m of water 12 Oct 0500 12 Oct 1100 6.00 0.25
Recover camera system 12 Oct 1100 12 Oct 1130 0.50 0.02
Handle BHA 12 Oct 1130 12 Oct 1145 0.25 0.01
CORK running tool clears the rig floor at 1145 h            
Beacon back on deck at 1210 h            
Hole U1382A totals: 1 Oct 1230 12 Oct 1145 263.25 10.97

Times are local ship time (Universal Time Coordinated [UTC] – 3 h) for all onsite operations. BHA = bottom-hole assembly, DQ = Dril-Quip, TDC = tapered drill collar, RIH = run in hole, POOH = pull out of hole. RCB = rotary core barrel. SCR = slow circulation rate.

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