Hourly activities:
00:00 - 00:30: Displaced out pill with seawater. Meanwhile started mixing new LCM pill.
00:30 - 02:00: Mixed LCM pill. Had problems with plugged auger screw in dry additive system. Added calcarb and steelseal by manual means. Meanwhile circulated hole at 2000 LPM inside 20" casing.
02:00 - 02:30: Pumped 9 m3 LCM at 2000 LPM. Chased LCM with 19 m3 seawater. POOH from 1381 to 1338 m MD when spotting the last 4 m3 of LCM. After shutting down pumps, experienced up to 30 MT overpull in interval 1360 to 1350 m MD. Came free to normal weight around 1350 m MD. Pulled back to 1338 m MD.
02:30 - 04:00: Lined up cement unit and verified line up down drillstring and in kill line on BOP. Perfomed line test to 100 bar 5 min OK. Closed BOP. Filled system with 1,8 m3 seawater zeroed volume counter at 5 bar. Performed fit to 1,50 EMW by pressurising up on well to 64 bar at 100 LPM. Held fit for 10 min 1,6 bar leak off. Volume pumped and bled back 972/910 liter. Operations transferred to f-15s
04:00 - 04:30: Flowchecked well well static. Held toolbox talk prior to displacing well to OBM.
04:30 - 05:15: RIH from 1338 m to 1380 m MD with 17 1/2" BHA. Started pumping 1,44 SG OBM. Stepped up rate in increments to 3400 LPM SPP 75 bar verified returns. Rotated at 30 RPM torque 12 k NM. After approx 34 m3 pumped observed pack off tendencies with SPP peaking rapidly to 180 bar. Stopped pumping. Trapped pressure on standpipe 32 bar. Bled off standpipe pressure.
05:15 - 06:00: Attempted to work string free. Not able to come down string at TD. Attempted to come up functioned jar twice. Attempted to work string free by applying torque up to 40 KNM and overpull of 40 MT. Made way from 1381 m to 1376 m MD. Attempted to pump hole still packed off. Bled off 27 bar pressure trapped on standpipe and heard loud roarring sound. Lost string weight went to just above block weight. POOH with 5 1/2" DP and found string screwed out underneath 6 m drilling pup joint. Laid out pup joint found no damage on threads.
06:00 - 06:45: Discussed fishing alternatives and way forward.
06:45 - 07:00: Held pre-job meeting for attempting to screw into drillpipe.
07:00 - 07:30: 1rih with 5 1/2" DP. Tagged fish at 41,6 m MD indicating that drillstring had fallen to the bottom of the well.
07:30 - 08:00: Attempted to screw into DP coupling at 41,6 m MD negative. Meanwhile traced fishing equipment.
08:00 - 09:15: Removed auto slips from rotary. Pulled DP to different positions relative to wellcenter in attempt to enter threads in drillstring. Entered DP thread successfully. Meanwhile traced fishing equipment.
09:15 - 09:30: Made up DP coupling at 41,6 m MD with topdrive. Increased torque in increments of 5 KNM to a total of 45 KNM. String broke free at 45 KNM.
09:30 - 09:45: Installed auto slips in rotary.
09:45 - 10:00: Picked up string weight 120 MT. Observed pipe free to move in intervall 1381 to 1372 m MD without applying overpull. Rotated string with 10 RPM 10 KNM.
10:00 - 11:45: Made plans for regaining circulation and continue displacement to OBM. Made plans for routing contaminated returns back to pits. Meanwhile rotated string with 10 RPM 10 KNM.
11:45 - 13:30: Started filling string which was partly empty due to u-tubing. Verified returns. Stepped up rate to 1500 LPM SPP 5 bar. Routed returns back to pits.
13:30 - 14:45: Caught up with u-tube after pumping approx 60 m3. Stepped up circulation rate in increments to 2900 LPM SPP 105 bar. Total volume of OBM pumped 253 m3.
14:45 - 15:45: POOH with 17 1/2" drilling BHA from 1372 m to 1357 m MD. Experienced 5-6 MT overpull when pulling bit through shoe at 1368 m MD. Experienced 12-15 MT overpull at 1357 m MD, depth corresponding to casing coupling between shoe joint and intermedate joint relative to near bit stab in BHA.
15:45 - 17:30: Made up TDS. Broke circulation and stepped up rate in increments to 2000 LPM SPP 55 bar. Made several attempts to pass restriction with and without rotation negative.
17:30 - 18:45: Set torque limit to 25 KNM. Set rotation at 15 RPM and worked restriction with 5mt overpull. Observed increasing torque fluctuating between 7 and 25 KNM.
18:45 - 19:00: Came through restriction at 1357 m MD. Worked new restriction at 1355 m with overpull and broke through. POOH to 1337 m MD.
19:00 - 19:30: Broke, inspected and racked back stand used for fishing drillstring.
19:30 - 19:45: Flowchecked well static. Rebooted vicis system due to problems with ZMS.
19:45 - 20:15: Inspected threads on DP coupling in RT- found some damage scoring. POOH with DP single to 1329 m MD. Observed gain in triptank indicating swabbing when pulling single. Flowchecked well static. Broke out single and laid out. Picked up new DP single and made up to stand.
20:15 - 21:15: Made up TDS. Emptied triptanks. POOH with 17 1/2" BHA from 1329 m to 1297 m MD while pumping at 1500 LPM SPP 26 bar. Prevailing problems with ZMS vicis control system.
21:15 - 22:00: Troubleshot ZMS vicis control system.
22:00 - 22:30: Broke and racked back stand. Made up TDS to string for circualting on well due to swabbing and troubleshooting ZMS vicis control system.
22:30 - 00:00: Broke circulation and stepped up rate to 2500 LPM SPP 82 bar. Observed sudden drop in pump pressure of 8 bar after pumping for 10 mins. Increased pump rate to 3500 LPM SPP 131 bar. Observed steady flow of LCM, clays and rubber over shakers. Also found a few small chunks of cement. Meanwhile troubleshot ZMS vicis control system.

24-hour summary: Discussed fishing alternatives and way forward. Successfully entered lost drillstring with standard DP thread, made up coupling with TDS. Worked string and found free to move. Made plans for continuing displacement to 1,44 SG OBM. Displaced well to OBM. POOH and worked through restriction at 1357 m MD. Not able to trip due to problems with ZMS system. Lined up and circulated well at 3500 LPM, took large amounts of cuttings over shakers. Had power black out on platform. Continued troubleshooting ZMS not able to remedy. POOH to 1117 m MD at reduced speed.