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Table T1. Operations, Site M0060.

Core
Coring
method
Date
(2013)
Time
(UTC)
Depth (mbsf)
Recovered
(m)
Recovery
(%)
Mud type
Comments
Top
Bottom
347-M0060A-
    23 Sep 0100           Rigged up and tested downhole camera system; system working but will not pass through the BHA
    23 Sep 0145           Ship on location in new position
    23 Sep 0445           Commenced operations; raised rooster box; checked new valve
    23 Sep 0506           Lowered template
    23 Sep 0600           Ran camera survey from in pipes only
    23 Sep 0745           Camera on deck, secured reel; set seabed template, still in the moonpool; retrieved drill pipe to drill floor; prepared drill floor with mouseholes, etc; made up BHA with core barrel + 2× collars and added pipe; did not use bit from Hole M0059C and fit new 6 cone rock roller
    23 Sep 0825           Reopened moonpool to fit bit into bit guide
    23 Sep 0845           Lowered seabed template to seabed; ready to run BHA and string
    23 Sep 0912           First drill pipe on
1H PCS 23 Sep 0950 0.00 0.00 0.00 0 Seawater No penetration, trace of sand on shoe
    23 Sep 1040           Second attempt; new valve (BOP) blew at 40 bar and pins did not shear; deck was sprayed with seawater
                  New valve (BOP) broken beyond repair; continued operations with old procedure
2H PCS 23 Sep 1113 0.00 0.00 0.00 0 Seawater Pins sheared but string rose, reducing penetration; apparent failure of seabed template clamps; barrel on deck; ~20 cm of sand recovered
    23 Sep 1140           Recovered template to deck to investigate problem
    23 Sep 1155           Template in moonpool and rebuilding the drill floor
    23 Sep 1348           Mouseholes replaced
3H PCS 23 Sep 1400 0.00 3.00 3.00 100 Seawater 100 bar, pressure did not release, left for 40 s before raising the rooster box
4H PCS 23 Sep 1450 3.00 4.90 1.90 100 Seawater 65/70 bar then up to 100, again left for 30 s before releasing pressure; both seals missing
5O NCA 23 Sep 1510 4.90 6.00 0.00 0 Seawater Open hole by washing down, no insert bit
6H PCS 23 Sep 1540 6.00 6.20 0.20 100 Seawater 60 bar, pressure released straight away
7O NCA 23 Sep 1600 6.00 9.00 0.00 0 Seawater  
8H PCS 23 Sep 1647 9.00 12.30 3.10 93.94 Seawater Clay: basket catcher removed
9H PCS 23 Sep 1730 12.30 15.60 2.46 74.55 Seawater 60 bar
10H PCS 23 Sep 1810 15.60 18.90 3.27 99.09 Seawater Double fire at 35 bar
11H PCS 23 Sep 1845 18.90 22.20 3.19 96.67 Seawater Replaced flapper catcher with a single basket and a spacer; double fire at 35 bar
12H PCS 23 Sep 1945 22.20 25.50 3.33 100.91 Seawater 60 bar
13H PCS 23 Sep 2020 25.50 28.80 3.37 102.12 Seawater Sample winch rope parted; tripped pipe
    23 Sep 2045           Replacing snapped slip bowl
    23 Sep 2330           First collar in slips
14O NCA 24 Sep 0000 28.80 30.53 0.00 0 Seawater Open hole
15H PCS 24 Sep 0045 30.53 33.83 3.53 106.97 Seawater  
16H PCS 24 Sep 0120 33.83 37.13 3.32 100.61 Seawater  
17H PCS 24 Sep 0200 37.13 40.43 3.31 100.3 Seawater  
18H PCS 24 Sep 0240 40.43 43.73 3.39 102.73 Seawater  
19H PCS 24 Sep 0315 43.73 47.03 3.68 111.52 Seawater  
  PCS 24 Sep 0355 47.03         First attempt failed to pressurize; pressure in hole, possibly did not drill out; flushed hole before reattempting
20H PCS 24 Sep 0450 47.03 50.33 3.57 108.18 Seawater  
21H PCS 24 Sep 0535 50.33 53.63 3.60 109.09 Seawater Fired at 65 bar before dropping, then rising to 85 bar and then 100 bar
22H PCS 24 Sep 0610 53.63 56.63 3.63 121 Seawater Fired at 70 bar, then dropped to 50 bar before holding for a short time and then dropping to zero
23H PCS 24 Sep 0645 56.63 60.23 3.49 96.94 Seawater Small rounded stone in clay in the shoe
24H PCS 24 Sep 0720 60.23 63.53 3.56 107.88 Seawater High pressure: fired at 50 bar, rose to 100 bar, bled off, then pressurized again; on releasing the template clamps the pressure reduced as the rooster box rose
25H PCS 24 Sep 0800 63.53 66.83 3.40 103.03 Seawater Full with very hard clay in shoe; drilled ahead to ream hole and clean barrel; very hard then back to more “normal” drilling
26H PCS 24 Sep 0845 66.83 69.83 3.01 100.33 Seawater One each brass and steel pin; fired at 80 bar, dropped to 50 and then 40 bar; had to open clamps and let pipe rise to remove pressure fully; 3 m hard clay recovered
27H PCS 24 Sep 0930 69.83 72.83 3.01 100.33 Seawater One each brass and steel pin; fired at just under 100 bar, dropped to 50 bar, back up to 60 bar until opened clamps, dropped to 25 bar almost straight away
    24 Sep 1037           2× steel pins; string pressurized to 100 bar before pump stalled; pressure dropped steadily to 60 bar before stopping until clamps opened and rooster box raised; tool recovered to deck for examination before running downhole again
28H PCS 24 Sep 1105 72.83 75.80 2.83 95.29 Seawater  
    24 Sep 1125           Sample winch rope snapped attempting to recover piston core
    24 Sep 1135           Attempted to fish overshot; tool recovered to deck twice to evaluate progress; on third recovery pulled pipe
    24 Sep 1450           First collar in the slips
    24 Sep 1500           Overshot at deck level, assessing damage and possible cause of failing of rope
    24 Sep 1520           Carried out a pull test on the rope on the deck to determine if it had weakened with time
    24 Sep 1600           Running pipe; tongs tips cracked, so stopped to repair the IR
    24 Sep 1935           Realigned damaged IR frame
    24 Sep 1950           Running pipe
    24 Sep 2010           IR hydraulics not functioning correctly, working on the tongs
    24 Sep 2030           Collars on
    24 Sep 2200           Washed down to 75.8 mbsf
29H PCS 24 Sep 2240 75.80 79.10 3.62 109.7 Seawater  
30H PCS 24 Sep 2335 79.10 82.40 3.58 108.48 Seawater  
31H PCS 25 Sep 0010 82.40 84.80 2.25 93.75 Seawater Only a partial stroke after double high pressure firing
32H PCS 25 Sep 0055 84.80 88.10 3.46 104.85 Seawater  
33H PCS 25 Sep 0135 88.10 91.40 3.22 97.58 Seawater Note some fingers of basket catcher ripped off and in core
34H PCS 25 Sep 0245 91.40 94.70 3.30 100 Seawater Strong backpressure when recovering sample, sand into tools; changed to Guar drill mud
    25 Sep 0350           Attempted piston core did not fire: returned to deck and flushed; lots of flowback so left out core barrel and flushed with mud; bottom 30 cm of hole seemed to be sand
35H PCS 25 Sep 0450 94.70 97.70 3.00 100 Guar Fired and then pressured to 100 bar; stayed at that pressure until released the string from the clamps and raised the rooster box; 3 m recovery but some may be reworked as very soft and not “core like”
    25 Sep 0530           Drilled and added pipe; very fast, no bit weight
36H PCS 25 Sep 0550 97.70 97.70 0.00 0 Guar Fired to 120 bar and only dropped when rooster box was lifted; attempted hammer sample at same depth
37S HS 25 Sep 0615 97.70 98.01 0.31 100 Guar Hard gray clay
38H PCS 25 Sep 0630 98.70 101.20 2.66 106.4 Guar 2× steel pins; again pressurized to 100 then 120 bar, stayed until lifted rooster box
39H PCS 25 Sep 0630 101.20 101.20 0.00 0 Guar No penetration; 2× steel pins, blew pump pressure release valve at 120 bar; released pressure by lifting string
40X ECS 25 Sep 0815 101.20 104.70 0.00 0 Guar No recovery; sand on face of core bit
41S HS 25 Sep 0905 104.70 104.70 0.10 100 Guar 20 blows
42X ECS 25 Sep 0940 104.70 106.70 0.00 0 Guar No recovery; shoe destroyed by stones
43O NCA 25 Sep 1100 106.90 109.70 0.00 0 Guar  
44X ECS 25 Sep 1120 109.70 112.70 0.00 0 Guar  
45P PCA 25 Sep 1220 112.70 113.70 0.02 2 Guar Only 0.5 metric ton required to push ahead
    25 Sep 1310 113.70         Attempted piston core with 2× brass pins; no penetration, no recovery
46H PCS 25 Sep 1400 113.70 114.20 0.10 20 Guar 2× steel pins; fired at 110 bar, stalled pump, pressure only released by raising the rooster box; large granite stone in show with some slightly silty shelly sand with gravel
47O NCA 25 Sep 1444 114.20 116.70 0.00 0 Guar Easy drilling; no torque or pressure
48H PCS 25 Sep 1535 116.70 118.20 1.50 100 Guar 115 bar; cracked pressure release to remove string pressure
    25 Sep 1545           Overshot unable to pick up sample tube; flushed string; pressure built before eventually going to zero
    25 Sep 1630           Flushed and rotated to ensure all sand(?) out of string
                  Unable to pick up sample tube; flushed again; several attempts at picking up sample tube eventually paid off
    25 Sep 1915           Added pipe; breaking pipes at deck, high volume flowing water from string
49O NCA 25 Sep 1950 118.20 119.70 0.00 0 Guar Open hole to 3 m beyond last sample start
    25 Sep 2015           Stalled pump at 120 bar; not known if pins sheared; pressure dropped to 50 bar before rooster box was raised and took some time to bleed off completely; failed to fire: not a run
50H PCS 25 Sep 2055 119.70 123.00 3.40 103.03 Guar Stalled pump at 135 bar; not known if pins sheared; pressure dropped to zero when rooster box was raised
51H PCS 25 Sep 2235 123.00 126.30 2.57 77.88 Guar  
52H PCS 25 Sep 2350 126.30 129.60 2.43 73.64 Guar  
53H PCS 26 Sep 0045 129.60 132.90 2.00 60.61 Guar  
54H PCS 26 Sep 0135 132.90 136.20 2.57 77.88 Guar 150 bar
    26 Sep 0220           Stopped drilling, cleared decks to lift seabed template after clamps on frame ceased working; lifted template, repaired, and tested; ready to be lowered to seabed again
    26 Sep 0530           Drill string rotated to bottom of borehole, less 1 m of infill
55H PCS 26 Sep 0630 136.20 139.50 3.00 90.91 Guar Fired and kept pressure to 150 bar and released only when pipe lifted
    26 Sep 0700           No obvious drilling change when drilling down to next sample point
56H PCS 26 Sep 0710 139.50 142.80 2.83 85.76 Guar Fired as before; same material
57H PCS 26 Sep 0800 142.80 146.10 2.60 78.79 Guar No change in conditions
    26 Sep 0850           Drilled to next sample point, started to get mud pressure and slower drilling for final meter or so; possibly clay
58H PCS 26 Sep 0900 146.10 149.40 1.93 58.48 Guar Fired at 80 bar; more of a pause before increasing to 125 bar and holding until pipe was released and lifted
59H PCS 26 Sep 1025 149.40 152.40 0.15 5 Guar  
60H PCS 26 Sep 1120 152.40 155.40 1.60 53.33 Guar Pump stalled at 150 bar
61H PCS 26 Sep 1220 155.40 155.70 0.30 100 Guar Apparently reworked clay
62N NRCB 26 Sep 1335 155.70 158.40 0.00 0 Guar Because of near zero recovery and apparent reworked/cuttings recovered, cored 3 m using ECS; on recovery there was no sample in the barrel but the catchers were inverted
63H PCS 26 Sep 1410 158.40 160.30 1.89 99.47 Guar Piston again recovered 1.89 m of reworked material; possibly the slipped core from the previous run
64O NCA 26 Sep 1525 158.40 159.40 0.00 0 Guar Drilled down 1 m to clear dropped core and any possible disturbed ground from piston Core 63H
65H PCS 26 Sep 1540 159.40 162.40 1.58 52.67 Guar Apparent reworked material recovered; thought this is damage caused by the basket catchers and changed to flapper catcher and one basket
66H PCS 26 Sep 1725 162.40 164.20 1.90 105.56 Guar Liner deformed because of suction pressure
67H PCS 26 Sep 1910 164.20 166.30 2.12 100.95 Guar Liner deformed because of suction pressure
68H PCS 26 Sep 2020 166.30 168.80 2.45 98 Guar Liner deformed because of suction pressure
69H PCS 26 Sep 2125 168.80 172.10 2.37 71.82 Guar Sand jammed piston
70H PCS 26 Sep 2300 172.10 175.40 2.30 69.7 Guar Sand jammed piston
71H PCS 27 Sep 0020 175.40 178.70 1.64 49.7 Guar  
72H PCS 27 Sep 0115 178.70 182.00 3.48 105.45 Guar  
73H PCS 27 Sep 0200 182.00 185.30 2.83 85.76 Guar  
74H PCS 27 Sep 0313 185.30 188.60 0.05 1.52 Guar PCS overshot wire snapped when trying to retrieve
    27 Sep 0315           Retrieved wireline to deck; ~15 m of rope on it
    27 Sep 0330           Prepared fishing tool with barbs; picked up but too sharp and shredded rope
    27 Sep 0430           Remade with smoother barbs; no success with two attempts
    27 Sep 0555           Prepared to trip pipe
    27 Sep 0615           Tripped pipe
    27 Sep 0710           Heated up pipe joints to free
    27 Sep 0845           Unable to free drill collar joint
    27 Sep 1000           Unable to free collars
    27 Sep 1100           Requested to use BGS Scorpion to free collars; successful on two joints
    27 Sep 1400           Ran pipe
    27 Sep 1530           Flowing water at joints between pipes 8 and 11 and again less so at various intervals down the hole
                  Hole sticky from 105 mbsf
    27 Sep 1900           Mouseholes in place, piston corer ready with 2× steel pins
    27 Sep 1900           Worked on sample winch hydraulics; fit diverter/safety valve to avoid snapping rope again
    27 Sep 2010           Tested winch settings
    27 Sep 2045           Washed down to point before last piston sample attempt with NCA in place
    27 Sep 2100           Extracted NCA/deployed PCS
75H PCS 27 Sep 2135 188.60 191.90 2.93 88.79 Guar 100 bar
                  Hole caved in while washing down to 191.9 mbsf
76H PCS 28 Sep 0000 191.90 195.20 2.66 80.61 Guar  
77H PCS 28 Sep 0115 195.20 198.50 3.42 103.64 Guar  
78S HS 28 Sep 0335 198.50 198.80 0.25 100 Guar Hammer sample used after two piston corer attempts failed to fire
79O NCA 28 Sep 0355 198.80 199.50 0.00 0 Guar  
80S HS 28 Sep 0415 199.50 199.54 0.00 0 Guar Fired at 50 bar then stopped; started pump again and raised pressure to 150 bar, then lowered to almost zero; prepared insert bit and push sample tube
81O NCA 28 Sep 0520 199.50 202.50 0.00 0 Guar  
82P PCA 28 Sep 0600 202.50 203.55 1.05 100 Guar  
83O NCA 28 Sep 0615 203.55 205.50 0.00 0 Guar  
84P PCA 28 Sep 0715 205.50 205.60 0.10 100 Guar  
85O NCA 28 Sep 0738 205.60 208.50 0.00 0 Guar Insert bit stuck in mud valve
86P PCA 28 Sep 0743 208.50 208.50 0.00 0 Guar  
87O NCA 28 Sep 0830 208.80 211.50 0.00 0 Guar  
88S HS 28 Sep 0900 211.50 211.70 0.20 100 Guar 20 blows with little penetration
89O NCA 28 Sep 0920 211.70 214.50 0.00 0 Guar Little pressure 2 m into run but then back into sand
    28 Sep 0955           Stopped operations to investigate mud leak from rotary valve stem when pipe is at lowest point
    28 Sep 1035           String broken in to allow the valve to be fully tightened by clamping it and turning swivel
90S HS 28 Sep 1135 214.50 214.60 0.10 100   Hard, compacted fine gray sand
91O NCA 28 Sep 1155 214.60 217.50 0.00 0 Guar  
92S HS 28 Sep 1245 217.50 217.70 0.20 100   32 blows
93O NCA 28 Sep 1310 217.70 220.50 0.00 0 Guar  
94S HS 28 Sep 1355 220.50 220.55 0.05 100   30 blows
95O NCA 28 Sep 1420 220.55 223.50 0.00 0 Guar Back of water up pipe at tool change
96S HS 28 Sep 1500 223.50 223.60 0.10 100   25 blows
97O NCA 28 Sep 1555 223.55 226.50 0.00 0 Guar String difficult to rotate following last sample; thought flowing water was bringing sand down with it; reamed entire pipe length to clear and stabbed ground to stop flow up string
98S HS 28 Sep 1655 226.50 226.60 0.10 100   25 blows
99O NCA 28 Sep 1715 226.60 229.50 0.00 0 Guar  
100S HS 28 Sep 1807 229.50 229.60 0.10 100   30 blows
101O NCA 28 Sep 1925 229.60 232.50 0.00 0 Guar Water followed NCA through mud valve; mud valve closed with pumping; overshot could not be released from NCA (blocked with sand), so lowered to deck; string became stuck and work commenced to release it
    28 Sep 2015           Gained 5 m of string and small amount of mud flow but no more
    28 Sep 2050           Attempted to hammer sand from string; estimated 24 m of sand in string
    28 Sep 2250           Stopped to repair hydraulics leak
    28 Sep 2330           Recommenced hammer sampling in pipe; possibly making progress, but no circulation of mud possible
    29 Sep 0130           Rigged up Pilcon winch to remove need for manual hammering
    29 Sep 0310           Stopped hammering and tried rotation and pulling
    29 Sep 0650           Restarted HS, measured progress: apparently at start position, thought that sand was still flowing in to string
    29 Sep 0750           Investigated running high-pressure air intake to mudline, which might shift sand and allow mud flow
    29 Sep 0910           After discussions of options, investigated decision to look at backing of string
    29 Sep 0920           Raised seabed template to inside the moonpool but below the first tool joint
    29 Sep 1020           Rigged up downhole camera; backed off string using tongs: went well and accomplished on the first attempt
    29 Sep 1120           Weight suggested only 4 or 5 pipes recovered; had a stick up of ~14 m from seabed
    29 Sep 1115           Rigged up ROV to monitor stick up while pushing down with the template
    29 Sep 1515           Successful leveling of stick-up pipe; ROV showed pipe leveled to seafloor with no protrusion
                  End of hole
347-M0060B-
    29 Sep 1600           Prepared BHA including torquing subs and 6 cone rock roller bit
    29 Sep 1835           Template moved into moonpool and lowered to seafloor
    29 Sep 1925           Ran string with BHA, 2 collars, and drill pipe
1H PCS 29 Sep 2050 0.00 2.80 2.71 96.79 Guar First run fired ~0.5 m above mudline
2H PCS 29 Sep 2140 2.80 2.80 0.00 0 Guar Uncertain if any sample ever went up into the barrel; may have fired on the way down
3H PCS 29 Sep 2225 2.80 6.10 2.70 81.82 Guar  
4H PCS 29 Sep 2305 6.10 9.40 3.29 99.7 Guar  
5H PCS 30 Sep 0010 9.40 12.70 2.87 86.97 Guar Used drilling mud to help stabilize sand at top of hole
6H PCS 30 Sep 0130 12.70 16.00 3.27 99.09 Guar  
7H PCS 30 Sep 0240 16.00 19.30 3.46 104.85 Guar Good, clean fire and pressure drop; good sample, catcher partially fell out; changed to flapper/basket catcher
8H PCS 30 Sep 0325 19.30 22.60 3.41 103.33 Guar Good fire/pressure drop, required more pressure to go to zero; microbiology mud sample taken at pipe break
9H PCS 30 Sep 0530 22.60 25.90 3.30 100 Guar Pressure only ~30 bar, but piston stroked out
10H PCS 30 Sep 0615 25.90 29.20 3.66 110.91 Guar Good fire and pressure but hole beginning to stick, so changed to water for drilling
11H PCS 30 Sep 0715 29.20 32.50 3.66 110.91 Guar Drilled down to next sample point and circulated for 20 min as hole still tightening; flushed, allowing seawater to fill the hole rather than mud, which may be causing the clay to swell
                  Hole stable; circulated again after pipe addition and reaming down
12H PCS 30 Sep 0835 32.50 35.80 3.29 99.7 Guar Good firing sequence
13H PCS 30 Sep 0910 35.80 39.10 3.55 107.58 Guar 50 bar then dropped before rising to 80 bar and dropping away
14H PCS 30 Sep 0940 39.10 42.40 3.60 109.09 Guar Good fire and dropped to zero right away
15H PCS 30 Sep 1040 42.40 45.70 3.46 104.85 Guar Could not recover the piston corer at first attempt; overshot brought back to the rooster box and pipe flushed, second attempt successful; very stiff clay
16H PCS 30 Sep 1200 45.70 49.00 3.71 112.42 Guar  
17H PCS 30 Sep 1200 49.00 52.30 3.62 109.7 Guar 75 bar straight down to zero
18H PCS 30 Sep 1340 52.30 55.60 3.62 109.7 Guar 75 bar straight down to zero
19H PCS 30 Sep 1430 55.60 58.90 3.57 108.18 Guar  
20H PCS 30 Sep 1520 58.90 62.20 3.49 105.76 Guar 70 bar then down to 50 before up again
21H PCS 30 Sep 1635 62.20 65.50 3.43 103.94 Guar 60 bar then down before up to 70 bar
22H PCS 30 Sep 1705 65.50 68.00 2.50 100 Guar  
23H PCS 30 Sep 1805 68.00 70.50 2.50 100 Guar “Soft fire”: low fire level with drop in pressure before rising, only dropped to zero with raising of the string
24H PCS 30 Sep 1910 70.50 73.00 2.40 96 Guar Liner collapsed top 75 cm; reverted to 2 brass pins
25H PCS 30 Sep 2000 73.00 76.30 3.30 100 Guar  
26H PCS 30 Sep 2100 76.30 79.60 3.33 100.91 Guar  
27H PCS 30 Sep 2210 79.60 82.90 3.19 96.67 Guar Strong artesian backflow when retrieving PC barrel
28H PCS 30 Sep 2300 82.90 85.70 2.82 100.71 Guar Overshot failed to pick up core barrel on two attempts; much pumping of mud required to free barrel
                  End of hole; reamed out to 85.5 mbsf and filled with thick mud ready for logging
    1 Oct 0100         Guar Lifted string to ~20 mbsf
    1 Oct 0240         Guar Completed first downhole log, maximum depth 64 mbsf
    1 Oct 0340         Guar Completed second downhole log, maximum depth 62 mbsf
    1 Oct 0554         Guar Lifted logging wire; calipers not working properly on tool or in formation; on deck found clay behind them
    1 Oct 0635           Logging tools clear of deck
    1 Oct 0659           First collar in slips
    1 Oct 0735           Template on deck, doors closed, and BHA in template

ECS = extended coring system, HS = hammer sampler, NCA = noncoring assembly, NRCB = nonrotating core barrel, PCA = push coring assembly, PCS = piston coring system. BHA = bottom-hole assembly, BOP = blowout preventer, IR = iron roughneck, BGS = British Geological Survey, ROV = remotely operated vehicle, PC = piston core.

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