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Table T1. Operations, Site M0063.

Core Coring
method 		Date
(2013) 		Time
(UTC) 		Depth (mbsf) Recovered
(m) 		Recovery
(%) 		Mud type Comments
Top Bottom
347-M0063A-
    8 Oct 0225           Arrived on location at Site M0063
    8 Oct 0345           Steady on site; approval to run pipe given
    8 Oct 0400           Seabed template in the moonpool
    8 Oct 0450           Template on the seabed and was compensating
    8 Oct 0515           4× collars on plus first API
    8 Oct 0945           20 m discrepancy in water depth: template raised to touch string near the expected bottom; to determine how many pipes to add; done because seabed might be too soft to notice when mudline is tagged
    8 Oct 1040           Lowered 1 m push sampler to determine how far above mudline the BHA is
    8 Oct 1043           Tool caught in string: pulled back and flush to clear
1P PCA 8 Oct 1049 0.00 0.49 0.49 100 Seawater Very soft, black, aromatic mud recovered
2H PCS 8 Oct 1120 0.00 3.30 3.97 120.3 Seawater Fired piston from calculated mudline (push sample filled back in to gap as it was so soft)
3H PCS 8 Oct 1225 3.30 6.60 3.09 93.64 Seawater Had to hammer and use small amount of flush to release corer; overshot pins changed
4H PCS 8 Oct 1325 6.60 9.90 2.70 81.82 Seawater Core squeezing into the lifting sub of the piston corer
5H PCS 8 Oct 1435 9.90 13.20 3.15 95.45 Seawater  
6H PCS 8 Oct 1515 13.20 16.50 3.25 98.48 Seawater Core continued to fill liner and up into the top sub of corer
7H PCS 8 Oct 1615 16.50 19.50 2.71 90.33 Seawater  
8H PCS 8 Oct 1715 19.50 22.80 3.70 112.12 Seawater Spline from the overshot “chaser/messenger” came off downhole; unsuccessful attempt to recover corer
    8 Oct 1930           Deployed fishing tools including directional magnet; one attempt picked up corer but dropped it at a narrow tool joint; spline fell faster than corer and both came together at a lower tool joint and jammed solid; despite being able to grab the corer on a number of occasions, we were not able to free it and so tripped the pipe
    8 Oct 2130           Pulled pipe until stuck PC revealed
    9 Oct 0050           Ran pipe back in to template
    9 Oct 0253           Washed down to 22.8 mbsf
9H PCS 9 Oct 0323 22.80 26.10 3.57 108.18 Seawater 60 bar
10H PCS 9 Oct 0510 26.10 29.40 3.70 112.12 Seawater  
    9 Oct 0630           Overshot release sleeve dropped out of slot on the way to recover the corer, jamming it in the string; prepared to fish with magnet; 2 attempts failed
    9 Oct 0745           Wired 2 basket catchers into a Rumohr tube with magnet at top; successfully recovered spline on 2nd attempt
11H PCS 9 Oct 0815 29.40 32.70 3.42 103.64 Seawater Good clean fire; soft, expanding gray clay
12H PCS 9 Oct 0930 32.70 36.00 3.60 109.09 Seawater  
13H PCS 9 Oct 1030 36.00 39.30 3.87 117.27 Seawater  
14H PCS 9 Oct 1115 39.30 42.60 3.97 120.3 Seawater 40 bar
15H PCS 9 Oct 1240 42.60 45.90 3.80 115.15 Seawater Slow build, possibly due to time taken to add pipe; blew at 40 bar
16H PCS 9 Oct 1330 45.90 49.20 3.74 113.33 Seawater 40 bar
    9 Oct 1400           PCS could not be recovered from the BHA even after heavy pulling and back-hammering with a little mud flush; after a lot of pulling and hammering, PCS recovered with a good core included
17H PCS 9 Oct 1525 49.20 52.50 3.64 110.3 Seawater 70 bar
18H PCS 9 Oct 1635 52.50 55.80 3.36 101.82 Seawater  
19H PCS 9 Oct 1740 55.80 59.10 1.52 46.06 Seawater 80 bar to shear/good release; corer stuck; back-hammering/low-level pumping did not release; overshot recovered to with pumping (mud valve closed); pressured string to 40 bar and blockage cleared, presumed to be a seal; second deployment of overshot recovered corer; reduced recovery due to high-level pumping
20H PCS 9 Oct 1920 59.10 62.40 3.69 111.82 Seawater Recovered first time
21H PCS 9 Oct 2035 62.40 65.70 3.38 102.42 Seawater  
22H PCS 9 Oct 2145 65.70 69.00 3.70 112.12 Seawater 40 bar
23H PCS 9 Oct 2359 69.00 72.30 3.49 105.76 Seawater  
24H PCS 10 Oct 0108 72.30 75.60 3.52 106.67 Seawater  
25H PCS 10 Oct 0213 75.60 78.90 3.64 110.3 Seawater  
26H PCS 10 Oct 0350 78.90 82.20 3.42 103.64 Seawater  
27H PCS 10 Oct 0505 82.20 85.50 3.48 105.45 Seawater  
28H PCS 10 Oct 0625 85.50 88.80 3.55 107.58 Seawater  
29H PCS 10 Oct 0730 88.80 92.10 3.45 104.55 Seawater Good fire of 60 bar, slow to rise but fell in two steps to zero
30H PCS 10 Oct 0845 92.10 93.90 1.80 100 Seawater Good fire and cleared to zero
    10 Oct 0858           Failed to recover corer; released overshot and recovered to allow pumping; still no release at second attempt; again recovered overshot for further flushing; replaced overshot shear pins while circulating mud/water
    10 Oct 0928           Reran overshot while circulating a small amount of water; pressure spike when connecting to the PCS but successfully recovered this time; till
31H PCS 10 Oct 0950 93.90 95.80 1.92 101.05 Seawater Pressure up to 100 bar stopped by driller as no sign of firing point; on raising rooster box, pressure immediately dropped to zero
32X ECS 10 Oct 1210 95.80 96.80 0.00 0 Seawater Switched to extended nose in an attempt to recover tills and advance faster than using the piston
33X ECS 10 Oct 1450 96.80 97.80 0.00 0 Seawater Corer could not be recovered, so 3 runs had to be made to clear the pipe sufficiently to get it back on deck
34P PCA 10 Oct 1450 97.80 98.80 0.27 27 Seawater  
35O NCA 10 Oct 1515 98.80 101.80 0.00 0 Seawater  
36P PCA 10 Oct 1545 101.80 102.80 0.66 66 Seawater Soft gray clay in shoe with disturbed sand above; attempted PCS next run
  PCS 10 Oct 1610 102.80 102.80 0.00 0 Seawater Piston failed to penetrate sediment; attempted push sample from same depth
37H PCS 10 Oct 1705 103.80 103.80 0.00 0 Seawater Full penetration: no recovery; trace of silty sand and gravel in barrel
38O NCA 10 Oct 1750 103.80 105.80 0.00 0 Seawater Slow drilling, 1.5 metric tons on bit, no mud pressure; hint of red material on insert bit
39S HS 10 Oct 1905 105.80 105.83 0.03 100    
40O NCA 10 Oct 2015 105.83 115.80 0.00 0 Seawater 107.8 mbsf at 2100 h, slow drilling, 2 metric tons on bit; much backfall; pink till on insert bit
41S HS 11 Oct 0100 115.80 115.81 0.01 100    
    11 Oct 0150           Started to pull pipe and prepare hole for logging
    11 Oct 0320           Ready to run first log
    11 Oct 0430           First logging back on deck, reached 108 mbsf
    11 Oct 0447           Second logging string running downhole
    11 Oct 0503           Second log completed and on deck
    11 Oct 0522           Third logging string going downhole
    11 Oct 0700           Logging complete
    11 Oct 0723           All logging equipment off deck
                  Prepared and tripped pipe to above seabed for bump over to Hole M0063B
347-M0063B-
    11 Oct 0850           Completed bumping over operation; seabed frame above seabed until first sample collected
                  Coring strategy: collect 2 m of sediment per fire to allow core expansion in 3.3 m liner; pull back 1.3 m from the base of each washed out interval before pressurizing string; advance BHA 2 m after PCS sample run
1H PCS 11 Oct 0910 0.00 2.00 1.52 76 Seawater PCS kept ~1.3 m above seabed to allow 2 m core to be taken with room for expansion of gaseous sediment
    11 Oct 0940           Unable to release PCS, so recovered overshot to allow flushing; successful second attempt
2H PCS 11 Oct 0910 2.00 4.00 3.52 176 Seawater  
3H PCS 11 Oct 1220 4.00 6.00 2.61 130.5 Seawater  
4H PCS 11 Oct 1300 6.00 8.00 2.34 117 Seawater  
5H PCS 11 Oct 1350 8.00 10.00 3.50 175 Seawater  
6H PCS 11 Oct 1455 10.00 12.00 2.61 130.5 Seawater  
7H PCS 11 Oct 1555 12.00 15.00 3.60 120 Seawater  
8H PCS 11 Oct 1640 15.00 17.00 3.16 158 Seawater  
9H PCS 11 Oct 1740 17.00 19.00 2.50 125 Seawater  
10H PCS 11 Oct 1825 19.00 21.00 2.64 132 Seawater  
11H PCS 11 Oct 1900 21.00 23.00 3.45 172.5 Seawater  
12H PCS 11 Oct 2000 23.00 25.00 3.27 163.5 Seawater  
13H PCS 11 Oct 2055 25.00 27.00 3.10 155 Seawater  
14H PCS 11 Oct 2140 27.00 29.00 2.85 142.5 Seawater  
    11 Oct 2230           End of Hole M0063B; started lifting pipe
    12 Oct 0052           At start of drill collars
    12 Oct 0330           Seabed frame to below deck
    12 Oct 0355           BHA removed and seabed frame secured on deck
347-M0063C-
    12 Oct 2115           Fitted transponder and lowered seabed template into the moonpool
    12 Oct 2125           Connected BHA
    12 Oct 2255           Lowered seabed template to ~428 m
    12 Oct 2315           Finished repairs to torque twister and lowered drill pipe
    13 Oct 0215           All collars on
    13 Oct 0229           Bit 1.3 m above seafloor
1H PCS 13 Oct 0330 0.00 2.00 3.71 185.5 Seawater Shot from 1.3 m above seabed; lowered seabed template to seabed
2H PCS 13 Oct 0430 2.00 4.00 3.12 156 Seawater 70 bar
3H PCS 13 Oct 0530 4.00 6.00 2.50 125 Seawater Strong H2S smell and >50% expansion of core
4H PCS 13 Oct 0620 6.00 8.00 2.24 112 Seawater Not as explosive as last run
5H PCS 13 Oct 0705 8.00 10.00 3.02 151 Seawater  
6H PCS 13 Oct 0750 10.00 12.00 2.44 122 Seawater  
7H PCS 13 Oct 0855 12.00 14.00 2.66 133 Seawater Took some time to pressure up; pipe change
8H PCS 13 Oct 0955 14.00 16.00 2.51 125.5 Seawater  
9H PCS 13 Oct 1050 16.00 18.00 2.61 130.5 Seawater 68 bar
10H PCS 13 Oct 1135 18.00 20.00 2.60 130 Seawater 68 bar
11H PCS 13 Oct 1225 20.00 22.00 2.64 132 Seawater New style seal fired at only 10 bar and seal lost
12H PCS 13 Oct 1345 22.00 24.00 2.68 134 Seawater Lost seal and stuck corer; recovered overshot and flushed with mud to clear
13H PCS 13 Oct 1440 24.00 26.00 3.23 161.5 Seawater Single new seal, old spacers
14H PCS 13 Oct 1520 26.00 28.00 2.79 139.5 Seawater  
15H PCS 13 Oct 1625 28.00 30.00 2.94 147 Seawater  
16H PCS 13 Oct 1715 30.00 32.00 3.00 150 Seawater  
17H PCS 13 Oct 1810 32.00 34.00 3.68 184 Seawater  
18H PCS 13 Oct 1900 34.00 36.00 3.64 182 Seawater  
19H PCS 13 Oct 1943 36.00 38.00 2.90 145 Seawater  
20H PCS 13 Oct 2039 38.00 40.00 3.36 168 Seawater  
21H PCS 13 Oct 2130 40.00 42.00 3.34 167 Seawater  
22H PCS 13 Oct 2328 42.00 44.00 3.48 174 Seawater Backflow in pipe when preparing core barrel, so pump clear for a bit
23H PCS 14 Oct 0027 44.00 46.00 3.05 152.5 Seawater Fired at 80 bar; kept pressure for longer but reduced to zero
24H PCS 14 Oct 0124 46.00 48.00 2.91 145.5 Seawater  
25H PCS 14 Oct 0220 48.00 50.00 3.08 154 Seawater  
26H PCS 14 Oct 0313 50.00 52.00 2.86 143 Seawater Less expansion noted; increased core run to 2.5 m
27H PCS 14 Oct 0445 52.00 54.50 2.81 112.4 Seawater Good core, little expansion; attempted 3.3 m core next time
28H PCS 14 Oct 0545 54.50 57.80 2.64 80 Seawater  
29H PCS 14 Oct 0630 57.80 61.10 3.38 102.42 Seawater  
30H PCS 14 Oct 0720 61.10 64.40 3.44 104.24 Seawater  
31H PCS 14 Oct 0815 64.40 67.70 3.55 107.58 Seawater  
32H PCS 14 Oct 0910 67.70 71.00 3.54 107.27 Seawater  
33H PCS 14 Oct 1010 71.00 74.30 3.54 107.27 Seawater  
34H PCS 14 Oct 1105 74.30 77.60 3.67 111.21 Seawater  
35H PCS 14 Oct 1150 77.60 80.90 3.47 105.15 Seawater  
36H PCS 14 Oct 1245 80.90 84.20 3.45 104.55 Seawater  
37H PCS 14 Oct 1335 84.20 87.50 3.51 106.36 Seawater  
38H PCS 14 Oct 1435 87.50 90.80 3.46 104.85 Guar  
39H PCS 14 Oct 1539 90.80 93.30 2.50 100 Guar  
40O NCA 14 Oct 1645 93.30 96.30 0.00 0 Guar  
41S HS 14 Oct 1720 96.30 96.40 0.10 100 Guar  
                  Pulled pipes
                  Seabed template off seafloor; bump over to Hole M0063D
347-M0063D-
    14 Oct 1830           Having bumped across from Hole M0063C, lowered template to 15 m above seafloor
1H PCS 14 Oct 1849 0.00 1.50 3.31 220.67 Seawater Fired first PC from 1.8 m above seabed, 9 bar
2H PCS 14 Oct 1935 1.50 3.50 3.73 186.5 Seawater 57 bar
3H PCS 14 Oct 2030 3.50 5.50 3.12 156 Seawater  
4H PCS 14 Oct 2121 5.50 7.50 2.26 113 Seawater  
5H PCS 14 Oct 2209 7.50 9.50 2.21 110.5 Seawater Relief valve tripping
6H PCS 14 Oct 2350 9.50 11.50 2.32 116 Seawater  
7H PCS 15 Oct 0043 11.50 13.50 2.59 129.5 Seawater Did not fire cleanly
8H PCS 15 Oct 0130 13.50 15.50 3.14 157 Seawater Did not fire despite increasing pump rate; recovered PCS to inspect; upon catching PCS with overshot, PCS appeared to move further into the BHA, so sent chaser down to release overshot and attempt fire; successful
9H PCS 15 Oct 0250 15.50 17.50 2.35 117.5 Seawater Fired at 40 bar after taking a while to build pressure
10H PCS 15 Oct 0409 17.50 19.50 3.17 158.5 Seawater Fired at 2nd attempt after pushing down with overshot; cleaned/rechecked tools; no apparent reason for not landing cleanly first time
11H PCS 15 Oct 0525 19.50 21.50 2.40 120 Seawater Fired first time after slow build up; next run to be 1.5 m to allow better offset in core correlation
12H PCS 15 Oct 0610 21.50 23.00 3.08 205.33 Seawater Fired at 50 bar on digital display, 65 bar on dial
13H PCS 15 Oct 0705 23.00 25.00 2.94 147 Seawater 2 m run
14H PCS 15 Oct 0750 25.00 27.00 2.52 126 Seawater  
15H PCS 15 Oct 0835 27.00 29.00 2.47 123.5 Seawater  
16H PCS 15 Oct 0920 29.00 31.00 2.58 129 Seawater  
17H PCS 15 Oct 1020 31.00 33.00 3.06 153 Seawater  
18H PCS 15 Oct 1100 33.00 35.00 2.92 146 Seawater  
19H PCS 15 Oct 1145 35.00 37.00 2.72 136 Seawater  
20H PCS 15 Oct 1230 37.00 39.00 2.64 132 Seawater Seal jammed PCS in BHA; extracted overshot and pump to retrieve
21H PCS 15 Oct 1340 39.00 41.00 2.91 145.5 Seawater  
22H PCS 15 Oct 1420 41.00 43.00 2.98 149 Seawater  
23H PCS 15 Oct 1520 43.00 45.00 2.69 134.5 Seawater  
24H PCS 15 Oct 1610 44.50 46.50 3.08 154 Seawater Driller washed down 1.5 m and took 2 m sample rather than washing down 2 m and taking a 1.5 m sample; upper section of the recovered core will be disturbed, but the sediment overlap was recovered
25H PCS 15 Oct 1645 46.50 48.50 3.19 159.5 Seawater  
26H PCS 15 Oct 1745 48.50 50.50 3.15 157.5 Seawater  
27H PCS 15 Oct 1835 50.50 52.50 2.89 144.5 Seawater  
28H PCS 15 Oct 1925 52.50 54.00 2.16 144 Seawater Short run done to maintain overlap of cores; shoe sample fell out
29O NCA     54.00 54.20 0.00 0 Seawater Accidental overdrill when washing down
30H PCS 15 Oct 2020 54.20 56.20 3.02 151 Seawater Designed run lengths to capture interval lost in previous boreholes at this site
31H PCS 15 Oct 2110 56.20 58.70 3.21 128.4 Seawater  
32H PCS 15 Oct 2210 58.70 61.20 3.47 138.8 Seawater  
33H PCS 15 Oct 2320 61.20 63.70 3.03 121.2 Seawater Liner was stuck, piston head seals damaged; some sand present
34H PCS 16 Oct 0035 63.70 67.00 2.64 80 Guar  
35H PCS 16 Oct 0130 67.00 67.60 0.63 105 Guar Piston may have fired prematurely on the way down
36H PCS 16 Oct 0232 67.60 70.30 2.19 81.11 Guar  
37H PCS 16 Oct 0330 70.30 73.60 3.43 103.94 Guar  
38H PCS 16 Oct 0430 73.60 76.90 3.67 111.21 Guar  
39H PCS 16 Oct 0545 76.90 80.20 3.52 106.67 Guar  
40H PCS 16 Oct 0650 80.20 83.50 3.50 106.06 Guar  
41H PCS 16 Oct 0805 83.50 86.80 3.56 107.88 Guar Sample removed from the PCS on deck when BHA was in the slips
    16 Oct 0850           PCS stuck in BHA; recovered overshot and replaced pins while flushing to clear/move obstruction; able to move PCS part way up the string before it became stuck again
                  Wireline rope parted; tripped the string
                  End of hole
    16 Oct 1300           BHA in the slips
                  Attempted to extract PCS from BHA without success, stuck fast; backed off top two joints to access possible blockage; joints only came partially open before becoming tight, so this operation stopped
                  Lifted BHA above deck to check for bend outside bit; no bend; extracted good sample from shoe; added spacer to barrel to allow movement of tube in BHA; backed off PCS barrel at quick release while still in BHA
    16 Oct 1430           Split BHA at stabilizer sub to view PCS head: discover rolled-over seal still in groove; cut and removed same; lowered BHA into the slips and removed piston rod with overshot in the conventional manner
    16 Oct 1530           Placed BHA on deck to torque with Scorpion
    16 Oct 1845           Could not torque top subs in slips; decided to switch out BHAs and use last remaining spare
                  Bumping over
347-M0063E-
    16 Oct 2020           Running pipe (BHA in slips)
    16 Oct 2100           All collars on
    16 Oct 2340           Bit at 1.3 m above seabed
1H PCS 16 Oct 2355 0.00 2.00 2.80 140 Seawater Fired at 1.3 m above seabed, 15 bar
2H PCS 17 Oct 0140 2.00 4.00 3.49 174.5 Seawater 57 bar
    17 Oct 0205           Lowered seabed frame onto seafloor
3H PCS 17 Oct 0303 4.00 6.00 2.25 112.5 Seawater  
4H PCS 17 Oct 0500 6.00 8.00 2.24 112 Seawater  
5H PCS 17 Oct 0555 8.00 10.00 2.70 135 Seawater  
6H PCS 17 Oct 0655 10.00 12.00 2.71 135.5 Seawater  
7H PCS 17 Oct 0750 12.00 14.00 2.84 142 Seawater  
8H PCS 17 Oct 0845 14.00 16.00 2.31 115.5 Seawater  
9H PCS 17 Oct 0930 16.00 18.00 2.74 137 Seawater  
10H PCS 17 Oct 1050 18.00 20.00 2.09 104.5 Seawater  
11H PCS 17 Oct 1155 20.00 22.00 2.65 132.5 Seawater  
12H PCS 17 Oct 1255 22.00 24.00 2.63 131.5 Seawater  
13H PCS 17 Oct 1350 24.00 26.00 1.88 94 Seawater 12 bar
14H PCS 17 Oct 1455 26.00 28.00 2.52 126 Seawater 13 bar; changed seal next run
15H PCS 17 Oct 1555 28.00 30.00 2.63 131.5 Seawater  
16H PCS 17 Oct 1630 30.00 32.00 3.45 172.5 Seawater  
17H PCS 17 Oct 1735 32.00 34.00 3.71 185.5 Seawater Did not fire; recovered to check, no problems obvious so changed pins and sent it back down; fired at 68 bar
18H PCS 17 Oct 1940 34.00 36.00 3.35 167.5 Seawater 61 bar
19H PCS 17 Oct 2035 36.00 38.00 2.82 141 Seawater 54 bar
20H PCS 17 Oct 2140 38.00 40.00 3.10 155 Seawater 13 bar
21H PCS 17 Oct 2253 40.00 42.00 2.60 130 Seawater 45 bar
22H PCS 17 Oct 2345 42.00 44.00 3.20 160 Seawater 45 bar
23H PCS 18 Oct 0048 44.00 46.00 2.72 136 Seawater 45 bar
24H PCS 18 Oct 0145 46.00 48.00 3.31 165.5 Seawater 15 bar
25H PCS 18 Oct 0237 48.00 50.00 3.39 169.5 Seawater 45 bar
26H PCS 18 Oct 0334 50.00 52.00 3.39 169.5 Seawater 73 bar
27H PCS 18 Oct 0512 52.00 54.00 3.41 170.5 Seawater 45 bar
28H PCS 18 Oct 0607 54.00 56.00 3.36 168 Seawater 45 bar
29H PCS 18 Oct 0712 56.00 58.00 3.12 156 Seawater 45 bar
30H PCS 18 Oct 0816 58.00 60.00 3.40 170 Seawater 10 bar but may be heave pressure after firing
    18 Oct 0900           Standby for weather
31H PCS 18 Oct 1645 60.00 62.00 3.35 167.5 Seawater 73 bar
32H PCS 18 Oct 1745 62.00 64.00 3.41 170.5 Seawater  
33H PCS 18 Oct 1845 64.00 66.00 3.48 174 Seawater  
34H PCS 18 Oct 1945 66.00 68.00 3.52 176 Seawater  
35H PCS 18 Oct 2040 68.00 70.00 3.60 180 Seawater 63 bar
36H PCS 18 Oct 2140 70.00 72.00 2.71 135.5 Seawater 20 bar
37H PCS 18 Oct 2235 72.00 74.00 3.01 150.5 Seawater 60 bar
38O NCA 18 Oct 2314 74.00 75.30 0.00 0 Seawater Driller mistakenly drilled below the base of the previous piston run
39H PCS 18 Oct 2320 75.30 78.60 3.14 95.15 Seawater 30 bar
40H PCS 19 Oct 0040 78.60 81.90 3.36 101.82 Seawater 80 bar
41H PCS 19 Oct 0140 81.90 85.20 3.49 105.76 Seawater 60 bar
42H PCS 19 Oct 0248 85.20 88.50 3.41 103.33 Seawater 60 bar
43H PCS 19 Oct 0345 88.50 91.80 3.30 100 Seawater 65 bar
44H PCS 19 Oct 0532 91.80 92.80 1.01 101 Seawater Erratic firing and lifted pipe, stones in till when recovered
    19 Oct 0610           Decision made to terminate borehole at this total depth
    19 Oct 0630           Commenced tripping pipe

ECS = extended coring system, HS = hammer sampler, NCA = noncoring assembly, PCA = push coring assembly, PCS = piston coring system. API = American Petroleum Institute size drill pipe, BHA = bottom-hole assembly, PC = piston core.

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