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Table T3. Expedition 335 operation summary.

Operation Start Expedition (from departure time) Comments
Local
time (h) 		Date
(2011) 		Duration Time (cumulative)
h day h day
In Puntarenas, Costa Rica, for port call activities.   14 Apr         Beginning of Expedition 335.
Depart Puntarenas; transit to Site 1256. 430 17 Apr 44.75 1.86 44.75 1.86 11.3 kt at 0630 h on 18 April.
On position over Hole 1256D. Pick up mouse hole, make up BHA with tricone bit and MBR. RIH drill string to 2733 mbrf while measuring and rabbiting all tubulars. 115 19 Apr 9.00 0.38 53.75 2.24 Start Run 1: Smith 9-7/8 inch F9 tricone bit.
Launch VIT. 1015 19 Apr 0.75 0.03 54.50 2.27  
RIH drill string 2733–3246 mbrf. 1100 19 Apr 1.25 0.05 55.75 2.32  
Lose VIT signal; retrieve VIT and repair cable head; redeploy VIT. 1215 19 Apr 3.25 0.14 59.00 2.46  
RIH drill string 3246–3637 mbrf. 1530 19 Apr 2.00 0.08 61.00 2.54  
Search and position vessel for reentry; reenter Hole 1256D at 1800 h. 1730 19 Apr 0.50 0.02 61.50 2.56 Reentry 1.
Continue RIH to 258.8 mbsf. 1800 19 Apr 1.25 0.05 62.75 2.61  
Recover VIT. 1915 19 Apr 0.75 0.03 63.50 2.65  
Continue RIH with 5-1/2 inch DP to 925.0 mbsf, where formation took 25,000 lb. Cancel temperature log and water sample. 2000 19 Apr 1.75 0.07 65.25 2.72  
Pull back in hole 925.0–891.9 mbsf. 2145 19 Apr 0.25 0.01 65.50 2.73 Obstruction.
Pick up 20 ft knobby and top drive. 2200 19 Apr 0.75 0.03 66.25 2.76  
RIH with top drive to 920.0 mbsf. 2245 19 Apr 0.75 0.03 67.00 2.79  
Work pipe at 920–925 mbsf, where we had hole problems during Exp. 312. Erratic torque; top drive current = 500 A. 2330 19 Apr 1.75 0.07 68.75 2.86  
Pull back 920–891.5 mbsf. 115 20 Apr 0.25 0.01 69.00 2.88  
Change out swivel packing. 130 20 Apr 1.25 0.05 70.25 2.93  
Resume washing/reaming 891.5–923.3 mbsf. Work stuck pipe 0415–0515 h when rotation lost. Unable to apply >10,000 lb WOB without stalling top drive. Circulate 600 bbl of hi-vis gel during 24 h period. Unable to penetrate deeper than 923.3 mbsf. Pump 150 bbl sweep at 923.3 mbsf. Trip drill string to change to a tricone bit with a more aggressive cutting structure. 245 20 Apr 27.25 1.14 97.50 4.06  
POOH with top drive 923.3–833.9 mbsf. 600 21 Apr 0.75 0.03 98.25 4.09  
Rack top drive. 645 21 Apr 0.50 0.02 98.75 4.11  
POOH from 833.9 mbsf and clear seafloor at 0900 h. Rack 4 stands of DC in derrick. Lay out BHA with MBR. Bit clears rotary table at 1550 h. 715 21 Apr 8.50 0.35 107.25 4.47 Clear seafloor at 0900 h. End Run 1 at 1550 h.
Make up new Reed 9-7/8 inch tricone bit, bit sub with float valve, and tandem set of boot baskets; RIH DP to 2877 mbrf. 1545 21 Apr 6.75 0.28 114.00 4.75 Start Run 2: Reed 9-7/8 inch tricone bit (IADC Type 517) plus boot baskets.
Deploy VIT. 2230 21 Apr 0.75 0.03 114.75 4.78  
Resume RIH drill string to 3638 mbrf. 2315 21 Apr 1.50 0.06 116.25 4.84  
Position vessel and reenter Hole 1256D at 0105 h. 045 22 Apr 0.50 0.02 116.75 4.86 Reentry 2.
RIH to 259.3 mbsf. 115 22 Apr 0.25 0.01 117.00 4.88  
Retrieve and recover VIT. 130 22 Apr 1.00 0.04 118.00 4.92  
Resume RIH 259.3–892.1 mbsf. 230 22 Apr 1.75 0.07 119.75 4.99  
Pick up top drive. 415 22 Apr 0.50 0.02 120.25 5.01  
Wash/ream hole from 892.1 mbsf. Attempt to pass bridge at ~920 mbsf. Pump 50 bbl hi-vis mud sweep. 445 22 Apr 1.75 0.07 122.00 5.08  
Work stuck pipe. 630 22 Apr 1.25 0.05 123.25 5.14 Stuck.
Wash/ream hole from ~920 mbsf. Circulate 100 bbl hi-vis mud sweep. 745 22 Apr 2.25 0.09 125.50 5.23  
Work stuck pipe. 1000 22 Apr 2.00 0.08 127.50 5.31 Stuck.
Wash/ream hole from ~923 mbsf. Unable to pass bridge. 1200 22 Apr 9.00 0.38 136.50 5.69  
Pull back in hole 923–863.3 mbsf. 2100 22 Apr 0.50 0.02 137.00 5.71  
Rack top drive. 2130 22 Apr 0.50 0.02 137.50 5.73  
POOH drill string and clear seafloor at 0005 h and plane of the rotary table at 0605 h. 2200 22 Apr 8.00 0.33 145.50 6.06 Clear seafloor at 0500 h. End Run 2 at 0605 h.
Lay out junk baskets and 9-7/8 inch bit. Junk baskets yielded some basaltic cuttings ranging from small gravel to rounded pebbles. Expedition 312 logs indicate a large washed-out zone at ~920–935 mbsf, which we will attempt to stabilize with a 5 bbl cement plug. 600 23 Apr 1.00 0.04 146.50 6.10 Samples Run02-EXJB. Decision to cement.
Make up cementing BHA with used Reed tricone bit without jets and 2 stands of DC. Deploy to 2676 mbrf. 700 23 Apr 6.00 0.25 152.50 6.35 Start Run 3: Reed tricone without jets.
Install VIT. 1300 23 Apr 0.50 0.02 153.00 6.37  
Resume RIH 2676–3638 mbrf. 1330 23 Apr 1.50 0.06 154.50 6.44  
Search and position vessel. Reenter Hole 1256D at 1520 h. 1500 23 Apr 0.25 0.01 154.75 6.45 Reentry 3.
RIH drill string to 262.9 mbsf. 1515 23 Apr 0.50 0.02 155.25 6.47  
POOH VIT and recover. 1545 23 Apr 1.50 0.06 156.75 6.53  
Resume RIH drill string. Tag bridge at 922 mbsf. 1715 23 Apr 1.50 0.06 158.25 6.59  
Make up circulating head and Lo-torque valves; pressure test to 1500 psi. 1845 23 Apr 0.50 0.02 158.75 6.61  
Pump 5 bbl of 16 ppg cement slurry. 1915 23 Apr 0.25 0.01 159.00 6.62 Pump cement.
Displace drill string with seawater (1× volume). 1930 23 Apr 0.50 0.02 159.50 6.65  
Lay out circulating head and pull back in hole with drill string to 806.9 mbsf. 2000 23 Apr 0.50 0.02 160.00 6.67  
Flush drill string with seawater (3× volume). 2030 23 Apr 1.25 0.05 161.25 6.72  
Lay out circulating head and POOH to 3191 mbrf. Clear top of the cone at 2320 h. Bit at rotary table at 0515 h. 2145 23 Apr 7.50 0.31 168.75 7.03 Clear seafloor at 2320 h. End Run 3 at 0515 h.
Make up new 9-7/8 inch Atlas tricone bit, inspect float, pick up 2 DC stands from derrick, and install piccolo at 199 mbrf. 515 24 Apr 1.50 0.06 170.25 7.09 Start Run 4: 9-7/8 inch tricone bit (Atlas HP61).
Service rig. 645 24 Apr 0.50 0.02 170.75 7.11  
Resume tripping drill string 199–1596 mbrf. 715 24 Apr 3.25 0.14 174.00 7.25  
Slip and cut 115 ft of drilling line. 1030 24 Apr 1.50 0.06 175.50 7.31  
Resume tripping drill string 1596–2731 mbrf. 1200 24 Apr 2.50 0.10 178.00 7.42  
Deploy VIT. 1430 24 Apr 0.50 0.02 178.50 7.44  
Continue RIH DP 2731–3636 mbrf. 1500 24 Apr 1.75 0.07 180.25 7.51  
Search and position vessel. Reenter Hole 1256D at 1655 h. 1645 24 Apr 0.25 0.01 180.50 7.52 Reentry 4.
Continue RIH drill string to 315.7 mbsf. 1700 24 Apr 0.50 0.02 181.00 7.54  
Recover VIT. 1730 24 Apr 0.75 0.03 181.75 7.57  
Continue RIH DP and tag bridge at 922 mbsf. 1815 24 Apr 1.25 0.05 183.00 7.62  
Pull back in hole to 890.6 mbsf. 1930 24 Apr 0.25 0.01 183.25 7.64  
Pick up top drive and RIH with same to 922.0 mbsf. 1945 24 Apr 1.00 0.04 184.25 7.68  
Attempt to wash/ream though bridge encountering high erratic torque; top drive max current = 650 A. 2045 24 Apr 1.00 0.04 185.25 7.72  
Pull back in hole with top drive to 890.6 mbsf. 2145 24 Apr 0.50 0.02 185.75 7.74 Decision to pump more cement.
Rack top drive. 2215 24 Apr 0.50 0.02 186.25 7.76  
POOH drill string from 890.6 to the surface. Clear seafloor at 0030 h. Bit at rotary table at 0615 h. 2245 24 Apr 7.50 0.31 193.75 8.07 Clear seafloor at 0300 h. End Run 4 at 0615 h.
Make up cementing bit (Reed type 517) without nozzles to 2 DC stands; RIH to 2661 mbrf. 615 25 Apr 6.00 0.25 199.75 8.32 Start Run 5: cementing bit (Reed type 517).
Deploy VIT. 1215 25 Apr 0.50 0.02 200.25 8.34  
Resume RIH drill string 2661–3637.8 mbrf. 1245 25 Apr 1.50 0.06 201.75 8.41  
Search and position vessel. Reenter Hole 1256D (Reentry 5) at 1445 h. 1415 25 Apr 0.50 0.02 202.25 8.43 Reentry 5.
Continue RIH drill string to 922 mbsf. 1445 25 Apr 2.50 0.10 204.75 8.53  
Install circulating head. Pressure test cement system. 1715 25 Apr 0.75 0.03 205.50 8.56  
Mix and pump 50 bbl of 15 ppg cement slurry. 1800 25 Apr 0.75 0.03 206.25 8.59 Pump cement.
Displace cement slurry with seawater. 1845 25 Apr 0.25 0.01 206.50 8.60  
Lay out circulating head and pull back in hole to 720.5 mbsf. 1900 25 Apr 0.75 0.03 207.25 8.64  
Circulate and flush drill pipe with seawater (3× drill string volume). 1945 25 Apr 1.00 0.04 208.25 8.68  
POOH drill string to surface. Clear the top of the cone at 2215 h. Bit at rotary table at 0345 h. 2045 25 Apr 7.00 0.29 215.25 8.97 Clear seafloor at 2215 h. End Run 5 at 0345 h.
Lay down Reed bit and pick up 9-7/8 inch Atlas HP61 tricone bit with tandem set of boot baskets and 2 DC stands; RIH to 200.6 mbrf. 345 26 Apr 1.75 0.07 217.00 9.04 Start Run 6: 9-7/8 inch Atlas HP61 tricone bit plus boot baskets.
Service rig: drawworks, crown, pipe stabber, traveling block, and dollies. 530 26 Apr 0.50 0.02 217.50 9.06  
Resume RIH 2676–3533 mbrf. 600 26 Apr 7.50 0.31 225.00 9.37  
Deploy VIT. 1330 26 Apr 0.50 0.02 225.50 9.40  
RIH drill string 3533–3638 mbrf. 1400 26 Apr 1.00 0.04 226.50 9.44  
Search and position vessel. Reenter Hole 1256D (Reentry 6) at 1520 h. 1500 26 Apr 0.25 0.01 226.75 9.45 Reentry 6.
Resume RIH drill string to 661.8 mbsf. 1515 26 Apr 1.75 0.07 228.50 9.52  
Recover VIT. 1700 26 Apr 0.50 0.02 229.00 9.54  
RIH drill string; make firm contact with cement at 882.0 mbsf. 1730 26 Apr 0.75 0.03 229.75 9.57  
Pick up top drive. 1815 26 Apr 0.50 0.02 230.25 9.59  
Drill out cement 882.0–922.0 mbsf. Circulate 40 bbl gel sweep at 904.6 mbsf. 1845 26 Apr 3.75 0.16 234.00 9.75  
Attempt to drill though bridge with high erratic torque. Circulate 50 bbl gel sweep at 922 mbsf. Continue to wash/ream at 922.0 mbsf. Top drive max current = 650 A. 2230 26 Apr 3.00 0.13 237.00 9.87  
Work stuck pipe at ~923 mbsf. Top drive max current = 800 A, overpull = 120,000 lb. 130 27 Apr 1.00 0.04 238.00 9.92  
Resume washing/reaming ledge at 922 mbsf with high rotary speed, high pump, and lighter WOB. We appeared to be making progress mid-morning only to lose it later in the day which may indicate that the obstruction is shifting. Circulate multiple 50 bbl hi-vis gel sweeps at 922 mbsf. Continue to wash/ream obstruction at 921.6 mbsf (tide ± 0.5 m). Circulate 100 bbl hi-vis gel sweep at 922.0 mbsf. 230 27 Apr 27.50 1.15 265.50 11.06  
Pull back with top drive 921.6–834.5 mbsf. 600 28 Apr 0.75 0.03 266.25 11.09  
Rack top drive. 645 28 Apr 0.50 0.02 266.75 11.11  
POOH from 834.5 mbsf and clear seafloor at 0850 h. Set back DC stands in the derrick and lay out junk baskets. Bit is at the rotary table at 1455 h. Lay out used bit in good condition with no appreciable shirttail wear, with all teeth intact, and exhibiting very little wear. 715 28 Apr 7.75 0.32 274.50 11.44 Clear seafloor at 0850 h. End Run 6 at 1455 h. Samples Run06-EXJB.
Make up new Smith tricone bit, bit sub with float, and 4 DC stands; RIH drill string to 2759 mbrf. 1500 28 Apr 5.75 0.24 280.25 11.68 Start Run 7: Smith tricone bit.
Slip and cut 115 ft of drilling line. 2045 28 Apr 1.50 0.06 281.75 11.74  
Install VIT. 2215 28 Apr 0.50 0.02 282.25 11.76  
Resume RIH drill string 2759–3640 mbrf. Fill DP every 10 stands. 2245 28 Apr 2.00 0.08 284.25 11.84  
Space out and position vessel to reenter Hole 1256D at 0135 h (Reentry 7). 045 29 Apr 0.75 0.03 285.00 11.88 Reentry 7.
RIH to 228.2 mbsf. 130 29 Apr 1.50 0.06 286.50 11.94  
Retrieve and recover VIT. 300 29 Apr 0.50 0.02 287.00 11.96  
Resume RIH 228.2–861.4 mbsf. 330 29 Apr 1.25 0.05 288.25 12.01  
Pick up top drive. 445 29 Apr 0.50 0.02 288.75 12.03  
RIH top drive 861.4–921.9 mbsf. 515 29 Apr 1.00 0.04 289.75 12.07  
Attempt to pass obstruction with pump and no rotation. No advance. 615 29 Apr 0.75 0.03 290.50 12.10  
Resume washing/reaming, drill though obstruction at 935.0 mbsf, and advance 921.9–941.5 mbsf. Circulate 100 bbl gel sweep at 931.0 mbsf. 700 29 Apr 17.00 0.71 307.50 12.81 Finally!
Continue washing/reaming 941.5–1143.2 mbsf. High torque and pump pressure increase of 500 psi when picking off slips at last connection. Circulate 50 bbl hi-vis gel sweeps at 988.6 and 1113.6 mbsf. 000 30 Apr 12.50 0.52 320.00 13.33  
Work back to 1114.4 mbsf and work out excess pump pressure and torque. 1230 30 Apr 1.50 0.06 321.50 13.40  
Resume washing/reaming 1143.2–1162.4 mbsf. High torque 500 psi pump pressure increase when coming off slips on last connection. 1400 30 Apr 2.50 0.10 324.00 13.50  
Work stuck pipe free. 1630 30 Apr 2.00 0.08 326.00 13.58  
Wash/ream 1162.4–1507.1 mbsf. Circulate 50 bbl hi-vis gel sweeps at 1142.6 and 1253.6 mbsf. Find 6 m of hard fill. 1830 30 Apr 14.75 0.61 340.75 14.20 Bottom of the hole.
Circulate 100 bbl hi-vis gel sweep. 915 1 May 1.25 0.05 342.00 14.25  
Pull back in hole 1507.1–1265.0 mbsf. 1030 1 May 1.75 0.07 343.75 14.32  
Set back top drive. 1215 1 May 0.50 0.02 344.25 14.34  
Pull drill string back in hole 1265.0–890.5 mbsf. 1245 1 May 2.00 0.08 346.25 14.43  
Pick up top drive. 1445 1 May 0.75 0.03 347.00 14.46  
RIH drill string and top drive to 967.3 mbsf with no drag or overpull. 1530 1 May 1.00 0.04 348.00 14.50  
Break circulation and spot 60 bbl of 10.5 ppg mud at 967 mbsf. 1630 1 May 0.50 0.02 348.50 14.52  
Pull back in hole with top drive to 861.7 mbsf. 1700 1 May 0.75 0.03 349.25 14.55  
Rack top drive. 1745 1 May 0.50 0.02 349.75 14.57  
POOH with top drive. Clear the top of the cone at 2005 h. Continue to POOH. Bit at rotary table at 0245 h. 1815 1 May 8.50 0.35 358.25 14.93 Clear seafloor at 2005 h. End Run 7 at 0245 h.
Make up cement BHA with used Reed 9-7/8 inch bit (without jets); RIH to 144 mbrf. 245 2 May 0.75 0.03 359.00 14.96 Start Run 8: cementing bit (used Reed 9-7/8 inch).
Service rig. 330 2 May 0.50 0.02 359.50 14.98  
RIH 144–2676 mbrf. Fill DP every 10 stands. 400 2 May 5.00 0.21 364.50 15.19  
Launch VIT. 900 2 May 0.75 0.03 365.25 15.22  
Resume RIH 2676–3637 mbrf. 945 2 May 3.00 0.13 368.25 15.34  
Search and position vessel. Reenter Hole 1256D at 1300 h. 1245 2 May 0.25 0.01 368.50 15.35 Reentry 8.
Resume RIH to 490.3 mbsf. 1300 2 May 1.25 0.05 369.75 15.41  
Recover VIT. 1415 2 May 0.50 0.02 370.25 15.43  
Continue RIH drill pipe to 960.5 mbsf. 1445 2 May 1.50 0.06 371.75 15.49  
Make up circulating head and pressure test same to 2000 psi. 1615 2 May 0.50 0.02 372.25 15.51  
Mix and pump 60 bbl of 15 ppg cement slurry. 1645 2 May 0.50 0.02 372.75 15.53  
Displace cement with seawater. 1715 2 May 0.50 0.02 373.25 15.55  
Lay out circulating head and pull back in hole to 605.5 mbsf. 1745 2 May 1.00 0.04 374.25 15.59  
Flush drill string with seawater (3× DP volume). 1845 2 May 1.00 0.04 375.25 15.64  
POOH drill string. Clear seafloor at 2105 h. Bit at rotary table at 0315 h. 1945 2 May 7.50 0.31 382.75 15.95 Clear seafloor at 0315 h. End Run 8 at 0315 h.
Lay out Reed tricone bit, pick up RCB assembly, and RIH to 200 mbrf. Space out RCB assembly. 315 3 May 2.75 0.11 385.50 16.06 Start Run 9: RCB assembly.
Service rig and RIS load pin transmitters. 600 3 May 0.50 0.02 386.00 16.08  
RIH DP 200–2732 mbrf. 630 3 May 4.00 0.17 390.00 16.25  
Deploy VIT. 1030 3 May 0.50 0.02 390.50 16.27  
Resume RIH 2732–3637 mbrf. 1100 3 May 1.25 0.05 391.75 16.32  
Search and position for reentry. Reenter Hole 1256D (Reentry 8) at 1235 h. 1215 3 May 0.25 0.01 392.00 16.33 Reentry 9.
RIH DP to 690.2 mbsf. 1230 3 May 1.25 0.05 393.25 16.39  
RIH DP and tag contact (ledge or top of plug) at 924.0 mbsf. 1345 3 May 1.25 0.05 394.50 16.44  
Pull back in hole 924.0–891.5 mbsf. 1500 3 May 0.25 0.01 394.75 16.45  
Pick up top drive. 1515 3 May 0.75 0.03 395.50 16.48  
Drill nonmagnetic core barrels and drop same. Establish SCR parameters. 1600 3 May 1.75 0.07 397.25 16.55  
Cut cement Cores 1G–5G (924.0–971.3 mbsf). 1745 3 May 12.25 0.51 409.50 17.06  
Pull back in hole to 833.9 mbsf. 600 4 May 0.75 0.03 410.25 17.09  
Rack top drive. 645 4 May 0.50 0.02 410.75 17.11  
Slip and cut 115 ft of drilling line. 715 4 May 1.50 0.06 412.25 17.18  
Drop wash barrel. 845 4 May 0.25 0.01 412.50 17.19  
RIH 833.9–949.1 mbsf. 900 4 May 0.50 0.02 413.00 17.21  
Pick up top drive. 930 4 May 0.50 0.02 413.50 17.23  
Continue to RIH with top drive 949.1–971.3 mbsf. 1000 4 May 0.50 0.02 414.00 17.25  
Round trip wash barrel and cut core 6G (971.3–980.9 mbsf). 1030 4 May 3.00 0.13 417.00 17.38  
Drop wash barrel and wash 980.9–1507.1 mbsf. Note tight hole at 1499.6–1501.1 mbsf. Pump 50 bbl hi-sweeps at 1154.6 and 1501.1 mbsf. 1330 4 May 9.25 0.39 426.25 17.76  
Circulate 50 bbl hi-vis gel sweep. 2245 4 May 1.00 0.04 427.25 17.80  
Deploy sinker bars. Round trip wash barrel at 1497.0 mbsf. Drop fresh core barrel. 2345 4 May 2.00 0.08 429.25 17.89  
RCB Cores 235R–236R (1507.1–1516.5 mbsf), employing half-cores with no liners to improve recovery. All cores obtained with nonmagnetic core barrels. 145 5 May 15.25 0.64 444.50 18.52 First 335 core! 235R (7%); 236R (13%).
Attempt to cut Core 237R (1516.5–1518.2 mbsf); max overpull = 60,000 lb, top drive max current = 800 A, WOB = 0. 1700 5 May 3.50 0.15 448.00 18.67  
RIH coring line and retrieve Core 237R (1516.5–1518.2 mbsf). Circulate 50 and 100 bbl hi-vis gel sweeps at 1518.2 mbsf. 2030 5 May 1.25 0.05 449.25 18.72 237R (empty).
Drop core barrel and attempt to cut Core 238R (1518.2–1520.2 mbsf; tidal = ±0.8 m). Pump 50 bbl hi-vis sweep at 1520.2 mbsf. Average ROP for May 5 = 0.7 m/h. 2145 5 May 14.25 0.59 463.50 19.31  
RIH sinker bars and recover core barrel containing 20 cm roller. 1200 6 May 1.50 0.06 465.00 19.38 238R.
Drop bit deplugger. Core catcher sub was ~0.5 inch abraded, indicating downhole mechanical problem. 1330 6 May 0.50 0.02 465.50 19.40  
RIH sinker bars and recover deplugger. Lay out same. Pump 70 bbl of 10.5 ppg mud. 1400 6 May 1.25 0.05 466.75 19.45  
Rack top drive. 1515 6 May 1.50 0.06 468.25 19.51  
Pull back in hole with drill string to 58.2 mbsf. 1645 6 May 3.75 0.16 472.00 19.67  
Flush drill string with seawater to clean reentry cone of cuttings. 2030 6 May 0.50 0.02 472.50 19.69  
POOH DP to the surface. Clear seafloor at 2115 h. Clear rotary table at 0545 h. Bit body honed to a smooth profile at bottom and sides. Bit missing all 4 cones, 4 legs, and core guides. Bit spiral stabilizer blades and embedded TCI inserts absent. Bit totally unrecognizable. 2100 6 May 8.75 0.36 481.25 20.05 Clear seafloor at 2115 h. End Run 9 at 0545 h. Bit disintegrated.
Prepare and make up Bowen 9 inch fishing magnet with 2 boot baskets to 2 stands of DC; RIH to 147 mbrf. 545 7 May 3.00 0.13 484.25 20.18 Start Run 10: Bowen 9 inch fishing magnet plus two junk baskets.
Service rig. 845 7 May 0.50 0.02 484.75 20.20  
Resume RIH 147–2680 mbrf. 915 7 May 5.00 0.21 489.75 20.41  
Install VIT. 1415 7 May 0.50 0.02 490.25 20.43  
Resume RIH drill string 2680–3632 mbrf. 1445 7 May 1.75 0.07 492.00 20.50  
Search and position vessel for reentry. Observe reentry cone clouded over with mud. Attempt reentry, miss cone, and pull back. Break circulation and reenter (Reentry 10) at 1815 h. 1630 7 May 1.75 0.07 493.75 20.57 Reentry 10.
RIH drill string to 580.1 mbsf. 1815 7 May 1.25 0.05 495.00 20.63  
Recover VIT. 1930 7 May 0.50 0.02 495.50 20.65  
RIH DP 580.1–1294.6 mbsf. Contact ledge that takes 10,000 lb. 2000 7 May 2.25 0.09 497.75 20.74  
Pick up top drive. 2215 7 May 0.50 0.02 498.25 20.76  
RIH top drive 1328.7–1434.2 mbsf. Tight hole at 1328.7 mbsf takes 10,000 lb. Excessive rotary current at 20 spm. Note increase in pump pressure (2500 psi at 20 spm). Bleed off pressure at rig floor. 2245 7 May 3.00 0.13 501.25 20.89  
Pull back in hole 1434.2–1395.8 mbsf and attempt to unplug drill string with high pressure. No joy. 145 8 May 1.25 0.05 502.50 20.94  
Pull back in hole 1395.8–1242.3 mbsf with top drive. 300 8 May 1.50 0.06 504.00 21.00  
Rack top drive. 430 8 May 0.50 0.02 504.50 21.02  
Pull back in hole 1242.3–264.2 mbsf to just inside casing shoe. 500 8 May 2.00 0.08 506.50 21.10  
Attempt to circulate with circulating head. No joy. 700 8 May 0.25 0.01 506.75 21.11  
POOH from 264.2 mbsf, clear seafloor at 0755 h. Recover drill string and set back 2 stands of DC. Find 4 m of fine cuttings plugging inside of bit sub and the 2 junk baskets. Clean out same. Lay out magnet, which is at the rotary table at 1555 h. 715 8 May 8.75 0.36 515.50 21.48 Clear seafloor at 0755 h. End Run 10 at 1555 h. Bit sub and junk basket filled with cuttings. Samples Run10-DC, Run10-EXJB, and Run10-FM.
Make up Atlas tricone bit to dual set of junk baskets with 3 DC stands and deploy to 2704 mbrf. 1600 8 May 8.00 0.33 523.50 21.81 Start Run 11: Atlas tricone bit plus junk baskets.
Launch VIT. 000 9 May 1.00 0.04 524.50 21.85  
Continue RIH DP 2704–3637 mbrf. Fill every 10 stands. 100 9 May 2.00 0.08 526.50 21.94  
Space out and reenter Hole 1256D at 0315 h (Run 11). 300 9 May 0.25 0.01 526.75 21.95 Reentry 11.
Continue RIH to 461.2 mbsf. 315 9 May 1.00 0.04 527.75 21.99  
Recover VIT. 415 9 May 0.50 0.02 528.25 22.01  
Resume RIH 461.2–1356.1 mbsf where bit contacts ledge. Pull back to 1324.3 mbsf. 445 9 May 2.50 0.10 530.75 22.11  
Pick up top drive and obtain SCR parameters. 715 9 May 0.50 0.02 531.25 22.14  
Clean up ledge at 1356.1 mbsf and continue in hole to 1442.5 mbsf. 745 9 May 1.50 0.06 532.75 22.20  
Circulate 100 bbl hi-vis gel sweep at 1442.5 mbsf. 915 9 May 0.75 0.03 533.50 22.23  
RIH 1442.5–1520.3 mbsf. Clean up undergauge areas of hole with top drive max current = 500 A. 1000 9 May 1.50 0.06 535.00 22.29  
Circulate 100 bbl hi-vis gel sweep at 1520.3 mbsf. 1130 9 May 0.50 0.02 535.50 22.31  
Continue to circulate hole clean and work rathole at 1520.3 mbsf. Circulate 100 bbl hi-vis gel sweep and circulate seawater (3× volume of annulus). 1200 9 May 4.25 0.18 539.75 22.49  
Pull back in hole with top drive 1520.3–1363.0 mbsf. 1615 9 May 1.50 0.06 541.25 22.55  
RIH with top drive and tag ledge at 1473 mbsf. Work though ledge with pumps and rotation. Observe excess pump pressure and torque off slips at 1477.5 mbsf. Unable to pump. Reestablish rotation and circulation. 1745 9 May 1.75 0.07 543.00 22.62  
Work pipe 1477.5–1459.0 mbsf. Clear excess pump pressure and torque. Top drive max current = 700 A; max pump pressure = 3000 psi. 1930 9 May 0.75 0.03 543.75 22.66  
RIH with top drive and ream 1477.6–1484.6 mbsf. Continue to RIH with top drive to 1518.2 mbsf. 2015 9 May 2.50 0.10 546.25 22.76  
Pump 150 bbl gel sweep at 1518.2 mbsf. 2245 9 May 2.25 0.09 548.50 22.85  
Pull back in hole with top drive 1518.2–1324.6 mbsf. 100 10 May 1.50 0.06 550.00 22.92  
Set back top drive. 230 10 May 0.50 0.02 550.50 22.94  
Resume pulling back in hole 1324.6–78.2 mbsf. 300 10 May 2.50 0.10 553.00 23.04  
Flush top of cone with seawater. 530 10 May 0.25 0.01 553.25 23.05  
POOH drill string from 78.2 mbsf. Clear seafloor at 0605 h. Bit at rotary table at 1130 h. 545 10 May 5.75 0.24 559.00 23.29 Clear seafloor at 0605 h. End Run 11 at 1130 h.
Empty junk baskets and lay out tricone. 1130 10 May 0.75 0.03 559.75 23.32 Nice cuttings in junk baskets. Samples Run11-EXJB.
Make up Bowen reverse circulating junk basket, 1 junk basket, and 2 DC stands; RIH to 2679 mbrf. 1215 10 May 7.25 0.30 567.00 23.62 Start Run 12: Bowen reverse circulation junk basket.
Slip and cut 115 ft of drilling line. 1930 10 May 1.50 0.06 568.50 23.69  
Install VIT. 2100 10 May 0.75 0.03 569.25 23.72  
Resume RIH drill string 2679–3640 mbrf. 2145 10 May 1.50 0.06 570.75 23.78  
Search and position vessel. Reenter Hole 1256D at 2330 h (Reentry 12). 2315 10 May 0.08 0.00 570.83 23.78 Reentry 12.
RIH to 808.7 mbsf. 2320 10 May 1.67 0.07 572.50 23.85  
Recover VIT. 100 11 May 0.50 0.02 573.00 23.87  
Resume RIH 808.7–1327.5 mbsf. 130 11 May 1.00 0.04 574.00 23.92  
Pick up top drive. 230 11 May 0.50 0.02 574.50 23.94  
Obtain SCR parameters and RIH 1327.5–1517.9 mbsf. 300 11 May 3.50 0.15 578.00 24.08  
Clean hole. Circulate at 150 spm with 1600 psi. Find 2.5 m of fill. 630 11 May 2.00 0.08 580.00 24.17  
Pump 100 bbl hi-vis sweep and chase with seawater (1.5x drill string volume). 830 11 May 1.00 0.04 581.00 24.21  
Drop stainless steel ball at 0937 h and activate reverse circulation in Bowen junk basket. 930 11 May 0.50 0.02 581.50 24.23 RCJB.
Attempt to drill over junk at the bottom of the hole. 1000 11 May 0.50 0.02 582.00 24.25  
Pull back in hole 1516.1–1328.6 mbsf. 1030 11 May 1.50 0.06 583.50 24.31  
Rack top drive. 1200 11 May 0.50 0.02 584.00 24.33  
POOH 1328.6–58.9 mbrf. Clear top of cone at 1520 h. 1230 11 May 9.00 0.38 593.00 24.71 Clear seafloor at 1520 h. End Run 12 at 2200 h. Samples Run12-DC, Run12-EXJB, Run12-RCJB.
Find BHA DC up to tapered DC filled with fine cuttings (50 m) weighing several hundred kg. Individually clear each DC and provide contents to scientists. Coarser gravel found in the head, crossover, and bit subs. Empty and clean out the Bowen tool containing ~20 kg of granoblastic dike rocks. 2130 11 May 8.00 0.33 601.00 25.04 Big rock samples, no cone.
Service rig. 530 12 May 0.50 0.02 601.50 25.06  
Make up Bowen tool with single junk basket and 2 DC stands; RIH to 2678 mbrf. 600 12 May 5.50 0.23 607.00 25.29 Start Run 13: Bowen RCJB.
Launch VIT. 1130 12 May 0.50 0.02 607.50 25.31  
Resume RIH 2678–3631 mbrf. 1200 12 May 1.25 0.05 608.75 25.36  
Search and position vessel. Reenter Hole 1256D at 1335 h. 1315 12 May 0.25 0.01 609.00 25.37 Reentry 13.
RIH DP to 664.8 mbsf. 1330 12 May 1.50 0.06 610.50 25.44  
Recover VIT. 1500 12 May 0.50 0.02 611.00 25.46  
Resume RIH 664.8–1384.8 mbsf. 1530 12 May 1.50 0.06 612.50 25.52  
Pick up top drive. 1700 12 May 0.50 0.02 613.00 25.54  
RIH with top drive and rotation and circulation past a soft tag at 1465.0 mbsf and a hard tag at 1518.0 mbsf. Backflow on connections starting at 1470.0 mbsf. 1730 12 May 2.75 0.11 615.75 25.66  
Work drill string to 1518.0 mbsf and fail in an attempt to penetrate to 1520.2 mbsf with max WOB = 2000–4000 lb and 160 spm at 1600 psi. Top drive current = 200–400 A. Circulate 100 bbl hi-vis sweep. Chase same with seawater (2× drill string volume). 2015 12 May 2.00 0.08 617.75 25.74  
Drop stainless steel ball to activate reverse circulation. Unable to shear pins in tool with pump pressure as high as 3000 psi at 50 spm. 2215 12 May 0.75 0.03 618.50 25.77  
Pull back in hole with top drive to 1327.3 mbsf. 2300 12 May 1.75 0.07 620.25 25.84  
Rack top drive. 045 13 May 0.50 0.02 620.75 25.86  
POOH from 1327.3 mbsf and clear seafloor at 0340 h. Bowen junk basket at rotary table at 1100 h. Basket contains granoblastic dike rocks as large as 3.4 kg. Apparently the Bowen tool was activated by the stainless steel ball. The loss of circulation was probably due to clogged jets. Almost the entire BHA was filled with fine cuttings again. 115 13 May 9.75 0.41 630.50 26.27 Clear seafloor at 0340 h. End Run 13 at 1100 h. Samples Run13-DC, Run13-EXJB, Run13-RCJB.
Dismantle Bowen reverse circulating junk basket and clean all components and service. 1100 13 May 1.75 0.07 632.25 26.34  
Lay down Bowen tool and pick up Homco 9.75 inch flow-though junk basket with bit sub junk basket and float, 2-stand BHA, and boot basket. Lay out 1 joint of 5-1/2 inch of transition pipe. RIH to 2670 mbrf. 1245 13 May 7.75 0.32 640.00 26.67 Start Run 14: Homco 9.75 inch flow-though junk basket with bit sub junk basket and float.
Deploy VIT. 2030 13 May 0.75 0.03 640.75 26.70  
RIH DP 2670–3631 mbrf. 2115 13 May 1.75 0.07 642.50 26.77  
Search and position vessel. Reenter Hole 1256D at 2315 h (Reentry 14). 2300 13 May 0.25 0.01 642.75 26.78 Reentry 14.
RIH drill string to 512.1 mbsf. 2315 13 May 1.50 0.06 644.25 26.84  
Recover VIT. 045 14 May 2.25 0.09 646.50 26.94  
Resume RIH 512.1–1404.3 mbsf. 300 14 May 0.50 0.02 647.00 26.96  
Continue RIH 1404.3–1517.2 mbsf. 330 14 May 2.25 0.09 649.25 27.05  
Pump 100 bbl sweep and continue to work down to top of fish at 1521.0 mbsf. 545 14 May 2.50 0.10 651.75 27.16  
Attempt to recover junk/fish. 815 14 May 0.50 0.02 652.25 27.18  
Circulate 50 bbl sweep at 1520.0 mbsf. 845 14 May 1.00 0.04 653.25 27.22  
Pull back in hole with top drive 1519.2–1404.6 mbsf. 945 14 May 0.75 0.03 654.00 27.25  
Rack top drive. 1030 14 May 0.50 0.02 654.50 27.27  
POOH with drill string and clear seafloor at 1345 h. Rack back DC in derrick. Homco FTJB clears rotary at 2010 h. 1100 14 May 9.25 0.39 663.75 27.66 Clear seafloor at 1345 h. End Run 14 at 2010 h. Samples Run14-EXJB, BSJB, FTJB.
Empty FTJB of 2 rocks (combined weight = 3.2 kg). Lower set of junk catcher fingers completely torn out. 2015 14 May 0.75 0.03 664.50 27.69  
Make up new Smith hard formation 9-7/8 inch tricone bit with single junk basket to 3-stand BHA and RIH to 84 mbrf. 2100 14 May 1.25 0.05 665.75 27.74 Start Run 15: Smith hard formation 9-7/8 inch tricone bit with single junk basket.
Slip and cut 115 ft of drilling line. 2215 14 May 1.50 0.06 667.25 27.80  
RIH with 5-1/2 inch transition pipe to 132.9 mbrf. 2345 14 May 0.25 0.01 667.50 27.81  
Service rig. 000 15 May 0.50 0.02 668.00 27.83  
Resume RIH 5-1/2 inch transition pipe 133–2694 mbrf, filling every 10 stands. 030 15 May 4.50 0.19 672.50 28.02  
Deploy VIT. 500 15 May 0.50 0.02 673.00 28.04  
Resume RIH 2694–3924 mbrf. Reenter Hole 1256D (Reentry 15) at 0730 h and RIH to 278.5 mbsf 530 15 May 3.00 0.13 676.00 28.17 Reentry 15.
Recover VIT. 830 15 May 0.50 0.02 676.50 28.19  
RIH 278.5–1371.8 mbsf. 900 15 May 3.25 0.14 679.75 28.32  
Pick up top drive. 1215 15 May 0.50 0.02 680.25 28.34  
Resume RIH from 1371.8 mbsf. Tag soft fill at 1510.0 mbsf and hard tag at 1518.8 mbsf. 1245 15 May 1.50 0.06 681.75 28.41  
Pick up 30 ft knobby and work bit with light WOB at 1518.5 mbsf and then down to 1520.6 mbsf multiple times, attempting to stabilize the bottom 2–3 m of the hole. Hole packs off below 1518.0 mbsf and requires working back to bottom. Circulate multiple mud sweeps at 1520.6 mbsf (total = 400 bbl). Continue to work drill string 1518.5–1521.05 mbsf. Pump 200 bbl of sweeps. Pull drill string to inspect and change the bit. 1415 15 May 16.00 0.67 697.75 29.07  
Pull back in hole with top drive 1515.5–1410.1 mbsf. 615 16 May 1.25 0.05 699.00 29.12  
Rack top drive. 730 16 May 0.50 0.02 699.50 29.15  
POOH drill string and clear seafloor at 1015 h. Rack back 3 stands. Bit clears rotary table at 1545 h. Inspect bit and find bearings still tight with virtually no wear on teeth except for a single chipped tooth on the heel. Bit is under gauge by 0.4 inches with some shirttail wear and minor junk damage on body. 800 16 May 7.75 0.32 707.25 29.47 Clear seafloor at 1015 h. End Run 15 at 1545 h. Samples Run15-EXJB.
Clean out junk basket. 1545 16 May 0.50 0.02 707.75 29.49  
Make up new 9-7/8 inch Smith FH3VPS tricone to a 3-stand BHA; RIH to 2693 mbrf. 1615 16 May 7.75 0.32 715.50 29.81 Start Run 16: 9-7/8 inch Smith FH3VPS tricone bit.
Deploy VIT. 000 17 May 0.50 0.02 716.00 29.83  
Resume RIH 2693–3644 mbrf. 030 17 May 2.00 0.08 718.00 29.92  
Space out to reenter. Reenter Hole 1256D at 0245 h (Reentry 16). 230 17 May 0.25 0.01 718.25 29.93 Reentry 16.
Resume RIH to 507.2 mbsf. Fill pipe every 10 stands. 245 17 May 1.25 0.05 719.50 29.98  
Recover VIT. 400 17 May 0.50 0.02 720.00 30.00  
Continue RIH 507.2–1399.7 mbsf. 430 17 May 2.00 0.08 722.00 30.08  
Pick up top drive. 630 17 May 0.50 0.02 722.50 30.10  
RIH 1399.7–1516.5 mbsf. 700 17 May 1.25 0.05 723.75 30.16  
Wash/ream 1516.5–1519.7 mbsf. Circulate 60 bbl sweep at 1516.7 mbsf. Flush hole with 200 bbl mud at 1519.6 mbsf. 815 17 May 16.00 0.67 739.75 30.82  
Pull back in hole with top drive 1519.6–1399.7 mbsf. 015 18 May 0.75 0.03 740.50 30.85  
Rack top drive. 100 18 May 0.50 0.02 741.00 30.87  
POOH drill string. Clear seafloor at 0340 h. Bit at rotary table at 0900 h. Lay out used tricone bit (in gauge) and minus 6 teeth on one cone. 130 18 May 7.50 0.31 748.50 31.19 Clear seafloor at 0340 h. End Run 16 at 0900 h.
Make up 9-5/8 inch flat-bottomed mill with EXJB and 3-stand BHA and RIH to 162 mbrf. 900 18 May 1.50 0.06 750.00 31.25 Start Run 17: 9-5/8 inch flat-bottomed mill with EXJB.
Service rig. 1030 18 May 0.50 0.02 750.50 31.27  
Resume RIH 162–2695 mbrf. 1100 18 May 4.75 0.20 755.25 31.47  
Install VIT. 1545 18 May 0.50 0.02 755.75 31.49  
RIH 2695–3637 mbrf. 1615 18 May 2.50 0.10 758.25 31.59  
Search and position vessel. Reenter Hole 1256D at 1850 h. 1845 18 May 0.25 0.01 758.50 31.60 Reentry 17.
RIH drill string to 480.5 mbsf. 1900 18 May 1.25 0.05 759.75 31.66  
Recover VIT. 2015 18 May 0.50 0.02 760.25 31.68  
Resume RIH 480.5–1429.9 mbsf. 2045 18 May 2.75 0.11 763.00 31.79  
Pick up top drive. 2330 18 May 0.50 0.02 763.50 31.81  
Continue RIH with top drive 1429.9–1520.0 mbsf. 000 19 May 1.50 0.06 765.00 31.87  
Mill debris at 1520.0–1521.0 mbsf. Use junk basket pump sweeps. Pump 200 bbl sweep at 1520.0 mbsf. 130 19 May 12.00 0.50 777.00 32.37  
Circulate 100 bbl sweep and chase same with seawater (2× drill string volume). 1330 19 May 1.25 0.05 778.25 32.43  
Lay out 30 ft knobby and pull back in hole with top drive to 1429.9 mbsf. 1445 19 May 0.75 0.03 779.00 32.46  
Rack top drive. 1530 19 May 0.50 0.02 779.50 32.48  
POOH and clear seafloor at 1920 h. Offset vessel 50 m west and continue POOH to 2354 mbrf. 1600 19 May 5.50 0.23 785.00 32.71 Clear seafloor at 1920 h.
Slip and cut 115 ft of drilling line. 2130 19 May 1.50 0.06 786.50 32.77  
Resume POOH to surface. Used mill at rotary table at 0315 h. 2300 19 May 4.25 0.18 790.75 32.95 End Run 17 at 0315 h. Samples Run17-BSJB.
Lay out mill. Clean and lay out damaged junk basket. Mill heavily worn and under gauge by ~0.5 inches. Pick up new 9 inch flat mill with fresh junk basket; RIH to 162 mbrf. 315 20 May 2.25 0.09 793.00 33.04 Start Run 18: 9 inch flat mill with junk basket.
Service rig. 530 20 May 1.00 0.04 794.00 33.08  
Resume RIH 162–2694 mbrf while filling every 10 stands. 630 20 May 5.00 0.21 799.00 33.29  
Launch VIT. 1130 20 May 0.50 0.02 799.50 33.31  
Resume RIH 2694–3637 mbrf. 1200 20 May 1.75 0.07 801.25 33.39  
Search and position vessel. Reenter Hole 1256D (Reentry 18) at 1415 h. 1345 20 May 0.50 0.02 801.75 33.41 Reentry 18.
RIH drill string to 451.2 mbsf. 1415 20 May 1.25 0.05 803.00 33.46  
Recover VIT. 1530 20 May 0.50 0.02 803.50 33.48  
Resume RIH 451.2–1458.6 mbsf. 1600 20 May 2.25 0.09 805.75 33.57  
Pick up top drive. 1815 20 May 0.50 0.02 806.25 33.59  
RIH with top drive; tag fill at 1518.9 mbsf. Advance with low pump and rotary speed and tag hard fill at 1520.4 mbsf. 1845 20 May 1.00 0.04 807.25 33.64  
Mill junk and work junk basket. Pump 100 bbl sepiolite sweep; pump 120 bbl sweep at 1520.9 mbsf. 1945 20 May 6.00 0.25 813.25 33.89  
Pump 100 bbl sepiolite sweep and circulate out. 145 21 May 1.25 0.05 814.50 33.94  
Pull back in hole with top drive 1520.9–1429.8 mbsf. 300 21 May 1.00 0.04 815.50 33.98  
Rack top drive. 400 21 May 0.50 0.02 816.00 34.00  
POOH from 1520.9 mbsf and clear seafloor at 0645 h; milling tool at drill floor at 1225 h. The abrasive surface of the milling tool was eroded, with some external junk damage on the side of the tool and the crossover sub directly above the mill. 430 21 May 8.00 0.33 824.00 34.33 Clear seafloor at 0645 h.
Empty and clean out the external junk basket. In addition to the usual rock fragments and fine cuttings, some flakes of what appears to be freshly ground metal were also found. 1230 21 May 0.25 0.01 824.25 34.34 End Run 18 at 1225 h. Samples Run18-BSJB.
Make up RCJB with 3 EXJB and deploy along with a 2-stand BHA. RIH to 2670 mbrf. 1245 21 May 7.50 0.31 831.75 34.66 Start Run 19: RCJB plus 3 EXJB.
Install VIT. 2015 21 May 0.50 0.02 832.25 34.68  
RIH drill string to 3632 mbrf. 2045 21 May 1.50 0.06 833.75 34.74  
Search and position vessel. Reenter Hole 1256D (Run 19) at 2230 h. 2215 21 May 0.25 0.01 834.00 34.75 Reentry 19.
RIH DP to 599.6 mbsf. 2230 21 May 1.25 0.05 835.25 34.80  
Recover VIT. 2345 21 May 0.50 0.02 835.75 34.82  
Continue RIH 599.6–1405.7 mbsf. 015 22 May 1.25 0.05 837.00 34.87  
Pick up top drive. 130 22 May 0.50 0.02 837.50 34.90  
RIH 1405.7–1519.5 mbsf. Hard tag at 1519.5 mbsf. 200 22 May 1.25 0.05 838.75 34.95  
Work junk baskets. 315 22 May 0.50 0.02 839.25 34.97  
Pump 100 bbl sweep and chase same with seawater (2× annular volume). Continue to work junk baskets. 345 22 May 2.00 0.08 841.25 35.05  
Drop stainless steel ball in open pipe. Advance RCJB to 1520.5 mbsf with slow rotation and light WOB. Jog rotation attempting to catch debris. 545 22 May 1.25 0.05 842.50 35.10  
Pull back in hole with top drive 1520.5–1434.4 mbsf. 700 22 May 0.50 0.02 843.00 35.13  
Rack top drive. 730 22 May 0.50 0.02 843.50 35.15  
POOH with drill string and clear seafloor at 1015 h. Rack back BHA. RCJB at rotary table at 1645 h. 800 22 May 8.75 0.36 852.25 35.51 Clear seafloor at 1015 h.
Empty RCJB of congealed sepiolite and 4 large rocks (total weight = 8.9 kg; largest rock = 3.9 kg). Unload 3 EXJB of cuttings and a few small metal fragments. 1645 22 May 1.25 0.05 853.50 35.56 End Run 19 at 1645 h. Samples Run19-RCJB, BSJB, EXBJ.
Rebuild and make up RCJB and 3 EXJB with a 2-stand BHA and RIH to 1793 mbrf. 1800 22 May 6.00 0.25 859.50 35.81 Start Run 20: RCJB plus 3 EXJB.
Repair pneumatic supply lines for drawworks high clutch. 000 23 May 3.00 0.13 862.50 35.94  
Resume RIH 1793–2670 mbrf. 300 23 May 1.25 0.05 863.75 35.99  
Launch VIT. 415 23 May 0.50 0.02 864.25 36.01  
RIH 2670–3640 mbrf. 445 23 May 1.75 0.07 866.00 36.08  
Position vessel, space out, and reenter Hole 1256D at 0635 h. 630 23 May 0.25 0.01 866.25 36.09 Reentry 20.
RIH to 513.5 mbsf. 645 23 May 0.75 0.03 867.00 36.13  
Recover VIT. 730 23 May 0.50 0.02 867.50 36.15  
Resume RIH 513.5–1462.9 mbsf. 800 23 May 1.25 0.05 868.75 36.20  
Pick up top drive. 915 23 May 0.50 0.02 869.25 36.22  
Continue RIH 1462.9–1519.0 mbsf. 945 23 May 0.75 0.03 870.00 36.25  
Hard tag at 1519.5 mbsf (tide adjusted). Work external junk baskets. 1030 23 May 0.25 0.01 870.25 36.26  
Pump 100 bbl sweep followed by seawater (2× annular volume). 1045 23 May 1.75 0.07 872.00 36.33  
Drop stainless steel ball and activate RCJB. Note increase in pressure of 600 psi. Unable to pass hard tag at 1519.0 mbsf with max WOB = 7000 lb and very slow rotation. 1230 23 May 0.75 0.03 872.75 36.36  
Pull back in hole with top drive to 1462.9 mbsf. 1315 23 May 0.75 0.03 873.50 36.40  
Rack top drive. 1400 23 May 0.50 0.02 874.00 36.42  
POOH with drill string to 3042 mbrf. Clear seafloor at 1725 h. 1430 23 May 4.00 0.17 878.00 36.58 Clear seafloor at 1725 h.
Slip and cut 115 ft of drilling line. 1830 23 May 1.50 0.06 879.50 36.65  
Resume POOH from 3042 to surface. RCJB at the rotary table at 0215 h. 2000 23 May 6.25 0.26 885.75 36.91  
Lay out and empty RCJB and 3 EXJB. RCJB contained 3 rocks (total weight = 5.0 kg), one (1.4 kg) is gabbro. The angularity of the rocks indicates fresh deposition with a suspected origin somewhere in the bottommost 7 m of the hole. The external junk baskets contain gravel-sized cuttings to small pebbles. 215 24 May 2.75 0.11 888.50 37.02 End Run 20 at 0215 h. Samples Run20-RCJB, BSJB, EXJB.
Make up RCJB and 3 EXJB with 2-stand BHA; RIH to 131 mbrf. 500 24 May 0.75 0.03 889.25 37.05 Start Run 21: RCJB plus 3 EXJB.
Service rig. 545 24 May 0.50 0.02 889.75 37.07  
Continue RIH 131–2670 mbrf. 615 24 May 3.25 0.14 893.00 37.21  
Launch VIT. 930 24 May 0.50 0.02 893.50 37.23  
Resume RIH 2670–3640.0 mbrf. Reenter Hole 1256D at 1115 h (Reentry 21). 1000 24 May 1.25 0.05 894.75 37.28 Reentry 21.
Continue RIH to 340.9 mbsf. 1115 24 May 0.75 0.03 895.50 37.31  
Recover VIT. 1200 24 May 0.50 0.02 896.00 37.33  
Resume RIH 340.9–1434.4 mbsf. 1230 24 May 2.25 0.09 898.25 37.43  
Pick up top drive. 1445 24 May 0.50 0.02 898.75 37.45  
RIH with top drive and minimum pump/rotation. Tag soft fill at 1518.8 mbsf. 1515 24 May 1.00 0.04 899.75 37.49  
Wash to 1519.8 mbsf and work junk baskets. 1615 24 May 0.25 0.01 900.00 37.50  
Pump 100 bbl of sepiolite sweep mud and chase with 2× annular volume of seawater. 1630 24 May 1.50 0.06 901.50 37.56  
Drop stainless steel ball, activate RCJB, and work same. 1800 24 May 0.75 0.03 902.25 37.59  
Displace lower portion of annulus with 200 bbl of drill water in preparation for logging. 1845 24 May 0.75 0.03 903.00 37.63  
Pull back in hole with top drive to 1462.9 mbsf. 1930 24 May 0.50 0.02 903.50 37.65  
Rack top drive. 2000 24 May 0.50 0.02 904.00 37.67  
Pull back in hole with drill string to 53.2 mbsf. 2030 24 May 3.50 0.15 907.50 37.81  
Repair and replace damaged cam roller on DES. 000 25 May 1.00 0.04 908.50 37.85  
Resume POOH from 53.2 mbsf and clear seafloor at 0100 h. 100 25 May 6.00 0.25 914.50 38.10 Clear seafloor at 0100 h.
Disassemble and empty RCJB of 4 small cobbles. Empty 3 EXJBs and clean out the usual assortment of cuttings, etc. 700 25 May 1.25 0.05 915.75 38.16 End Run 21 at 0700 h. Samples Run21-RCJB, BSJB, EXJB.
Make up Bowen fishing magnet and 3 EXJB; RIH to 109.5 mbrf. 815 25 May 1.25 0.05 917.00 38.21 Start Run 22: fishing magnet plus 3 EXJB.
Service rig. 930 25 May 0.50 0.02 917.50 38.23  
Resume RIH 109.5–2612 mbrf. 1000 25 May 4.50 0.19 922.00 38.42  
Install VIT. 1430 25 May 0.50 0.02 922.50 38.44  
Continue RIH 2612–3632 mbrf. 1500 25 May 1.50 0.06 924.00 38.50  
Search and position vessel. Reenter Hole 1245D at 1645 h (Reentry 22). 1630 25 May 0.25 0.01 924.25 38.51 Reentry 22.
RIH to 427.1 mbsf. 1645 25 May 1.25 0.05 925.50 38.56  
Recover VIT. 1800 25 May 0.50 0.02 926.00 38.58  
Resume RIH 427.1–1462.6 mbsf. 1830 25 May 2.50 0.10 928.50 38.69  
Pick up top drive. 2100 25 May 0.50 0.02 929.00 38.71  
RIH with top drive; tag fill at 1519.0 mbsf. 2130 25 May 0.50 0.02 929.50 38.73  
Wash to 1520.0 mbsf. Work fishing magnet and junk baskets. 2200 25 May 0.50 0.02 930.00 38.75  
Displace lower annulus with 200 bbl of drill water. 2230 25 May 0.50 0.02 930.50 38.77  
Pull back with top drive to 1433.8 mbsf. 2300 25 May 0.75 0.03 931.25 38.80  
Rack top drive. 2345 25 May 0.50 0.02 931.75 38.82  
POOH with drill string and clear seafloor at 0230 h. 015 26 May 7.75 0.32 939.50 39.15 Clear seafloor at 0230 h.
Disassemble and empty EXJBs. Fishing magnet contained very little metal debris all of which was finely ground?! 800 26 May 1.00 0.04 940.50 39.19 End Run 22 at 0800 h. Samples Run22-FM, BSJB, EXJB.
Make up and deploy logging bit and DC and deploy same to 2923 mbrf. 900 26 May 6.50 0.27 947.00 39.46 Start Run 23: downhole measurements (logging bit).
Deploy VIT. 1530 26 May 0.50 0.02 947.50 39.48  
RIH drill string to 3638 mbrf. 1600 26 May 1.25 0.05 948.75 39.53  
Search and position vessel. Reenter Hole 1256D at 1725 h. 1715 26 May 0.25 0.01 949.00 39.54 Reentry 23.
RIH drill string to 203.3 mbsf. Pick up 2 knobbies and set EOP at 218.9 mbsf. 1730 26 May 1.25 0.05 950.25 39.59  
Recover VIT. 1845 26 May 1.25 0.05 951.50 39.65  
Rig up for logging. 2000 26 May 0.50 0.02 952.00 39.67  
Make up Log 1 (triple combo: GR/APS/HLDS/HRLA/GPIT) 2030 26 May 2.50 0.10 954.50 39.77  
Deploy Log 1 into the pipe at 2255 h. Reached the bottom of the hole at 1520.0 mbsf. Recover tool at 0700 h. 2300 26 May 8.00 0.33 962.50 40.10  
Disassemble triple combo. Make up second log (FMS-sonic). Deploy FMS-sonic into the pipe at 1050 h. 700 27 May 4.00 0.17 966.50 40.27  
Tool unable to exit pipe into hole. Recover FMS-sonic at 1410 h. 1100 27 May 3.25 0.14 969.75 40.41  
Replace damaged lower centralizer spring and redeploy FMS-sonic at 1500 h. 1415 27 May 0.75 0.03 970.50 40.44  
RIH FMS-sonic. Tool appears to jam inside BHA with lower section (~20 m) of unit extending 20 m into open hole. 1500 27 May 1.50 0.06 972.00 40.50 FMS-sonic string jammed in logging bit.
Attempt to pump tool clear without success. 1630 27 May 1.75 0.07 973.75 40.57  
Make up Kinley cutter assemblies. Drop crimper into pipe at 2135 h. 1815 27 May 4.50 0.19 978.25 40.76  
Drop hammer into pipe at 2245 h. 2245 27 May 0.50 0.02 978.75 40.78  
Assemble Kinley severing tool and drop into pipe. 2315 27 May 2.00 0.08 980.75 40.86  
Drop hammer and server logging cable. 115 28 May 0.50 0.02 981.25 40.89  
Recover and tie back logging cable. 145 28 May 1.75 0.07 983.00 40.96  
POOH with drill string to 19 mbrf. Clear seafloor at 0425 h. 330 28 May 6.00 0.25 989.00 41.21 Clear seafloor at 0425 h.
Release jammed FMS-sonic tool from landing saver sub in BHA. Tool is in good condition. 930 28 May 2.50 0.10 991.50 41.31 End Run 23 at 0930 h. No FMS-sonic, no UBI.
Make up RCB 3-stand BHA with new RCB C-9 bit. Check core barrel space out and RIH to 134 mbrf. 1200 28 May 2.00 0.08 993.50 41.40 Start Run 24: Ulterra RCB-9 bit for coring and then cementing.
Slip and cut 115 ft of drilling line (eight of expedition). 1400 28 May 1.50 0.06 995.00 41.46  
RIH drill string to 2695 mbrf. 1530 28 May 5.00 0.21 1000.00 41.67  
Launch VIT. 2030 28 May 0.50 0.02 1000.50 41.69  
RIH drill string to 3638 mbrf. 2100 28 May 1.25 0.05 1001.75 41.74  
Search and position vessel. Reenter Hole 1256D at 2225 h (Reentry 24). 2215 28 May 0.25 0.01 1002.00 41.75 Reentry 24.
RIH drill string to 1430.5 mbsf. 2230 28 May 2.75 0.11 1004.75 41.86  
Recover VIT and coat line on the way out. 115 29 May 0.75 0.03 1005.50 41.90  
Pick up top drive and obtain SCR parameters. 200 29 May 0.50 0.02 1006.00 41.92  
RIH top drive 1430.5–1520.2 mbsf. 230 29 May 1.50 0.06 1007.50 41.98  
Circulate 100 bbl sweep at 1520.0 mbsf. 400 29 May 1.25 0.05 1008.75 42.03  
Drop fresh core barrel and rotary core 239R (1520.2–1521.6 mbsf) at average ROP = 0.6 m/h. Average recovery = 36%. No indication of metal in the core barrel. No symptoms of downhole junk in the coring process. Time for coring expires. Prepare for cementing. Circulate 50 bbl sweep at 1521.6 mbsf. 515 29 May 5.00 0.21 1013.75 42.24 Core 239R.
RIH coring line to 1510.6 mbsf and coat same on retrieval. 1015 29 May 1.75 0.07 1015.50 42.31  
Rack sinker bars and dress for layup period. 1200 29 May 0.25 0.01 1015.75 42.32  
Pull back in hole with top drive to 1487.8 mbsf. Rack top drive. 1215 29 May 1.00 0.04 1016.75 42.36  
Make up circulating head and pressure test same. Position bit at 1518.6 mbsf. 1315 29 May 0.50 0.02 1017.25 42.39  
Mix and pump 15 bbl of 15 ppg cement. 1345 29 May 0.50 0.02 1017.75 42.41 Cement plug 1 (BOH).
Displace cement with seawater. 1415 29 May 0.50 0.02 1018.25 42.43  
Lay out circulating head and pull back in hole to 1372.6 mbsf. 1445 29 May 0.50 0.02 1018.75 42.45  
Flush drill string with seawater (2× annular volumes). 1515 29 May 1.00 0.04 1019.75 42.49  
Pull back with drill string to 940.8 mbsf. 1615 29 May 1.00 0.04 1020.75 42.53  
Mix and pump 58 bbl of 15 ppg cement slurry. 1715 29 May 1.00 0.04 1021.75 42.57 Cement plug 2 (910–940 mbsf).
Displace cement with seawater. 1815 29 May 0.50 0.02 1022.25 42.59  
Pull back with drill string to 739.3 mbsf. 1845 29 May 0.75 0.03 1023.00 42.63  
Flush drill string seawater (2× annular volumes). 1930 29 May 0.50 0.02 1023.50 42.65  
POOH with drill string. Clear top of cone at 2135 h. Disassemble BHA and stow DC in forward tubular racks. 2000 29 May 12.00 0.50 1035.50 43.15 Clear seafloor at 2135 h. End Run 24.
Recover beacons and secure vessel for sea. 800 30 May 3.50 0.15 1039.00 43.29  
Under way to Balboa, Panama. Advance clock 1 h on 31 May (1200 h). 1130 30 May 91.50 3.81 1130.50 47.10 End of Expedition 335.

Table based on R. Grout (Operations Superintendent) daily operations reports. Time breakdown is by nearest 0.25 h. BHA = bottom-hole assembly, MBR = mechanical bit release, VIT = vibration-isolated television, RIH = run in hole, WOB = weight on bit, POOH = pull out of hole, IADC = International Association of Drilling Contractors, EXJB = external junk basket, RCB = rotary core barrel, RIS = Rig Instrumentation System, ROP = rate of penetration, TCI = tungsten carbide inserts, DC = drill collar, DP = drill pipe, SCR = slow circulating rate, RCJB = reverse circulation junk basket, TDC = tapered drill collar, FTJB = flow-through junk basket, BSJB = bit sub junk basket, DES = dual-elevator stool on the rig floor, EOP = end of pipe, GR = natural gamma ray logging tool, APS = Accelerator Porosity Sonde, HLDS = Hostile Environment Litho-Density Sonde, HRLA = High-Resolution Laterolog Array, GPIT = General Purpose Inclinometry Tool, FMS-sonic = Formation MicroScanner sonic, UBI = Ultrasonic Borehole Imager, BOH = bottom of hole. This table is available in ASCII and in Microsoft Excel format (see 101_T03.XLS in CHAPTER_101 in TABLES in“Supplementary material”).

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