Hourly activities:
00:00 - 00:45: Continued milling 10 3/4in subsea CSG hanger. 1970l/min, 9bar, 80-120rpm, 5-13knm, 1-8t wob. Heard sound and observed loss of wob indicating casing parted from hanger. Total of 27cm milled.
00:45 - 01:00: Passed up/down several times through hanger area with and without rotation. MAX 4t overpull without rotation. Tagged casing stump at 141,84m w/ 4t.
01:00 - 02:45: Dressed off top of casing from 141,84m to 141,91m Parameters 1970l/min, 80-120rpm, 5-13knm, wob 1-6t
02:45 - 03:00: Circulated 2x bu 3000l/min 23bar
03:00 - 03:15: L/d 1x DP single
03:15 - 03:45: Performed drops inspection and service on TDS. Observed loss in TT of 8m3/hour. Inspected and confirmed no leak on surface
03:45 - 05:15: Continued monitoring well on TT while discussing way forward. Meanwhile TBT for POOH. Constant loss rate of 0,8m3/hour
05:15 - 06:15: POOH w/ milling BHA to surface. Losses decreased to 0,4m3/hour while POOH
06:15 - 07:00: L/d milling BHA. Inspected magnet. Very fine swarf observed, not possible to weigh. Loss rate less than 0,1m3/hour
07:00 - 07:15: Cleaned and cleared rig floor
07:15 - 07:30: Performed pre-job meeting to p/u cutting assembly
07:30 - 09:15: M/u cutting assembly
09:15 - 09:30: Installed ps21
09:30 - 10:30: RIH with cutting assy from 16m on 5,5in DP to 767m
10:30 - 12:45: LD 1x DP single. M/u spear assy. Removed ps21, installed master bushing. Inspected and greased up spear. RIH 1x stand of DC
12:45 - 13:30: RIH from 821m to 900m on DP. Filled string. Up/down weights 106t/100t. RIH to 918. 9m
13:30 - 14:30: Pulled up to 170t on hook load ton overpull) in order to engage spear inside 10 3/4in CSG and put casing in tension started cutting casing 1700l/min 92 bar, 1800l/min 97 bar, 1900l/min 101 bar, 2000l/min 104 bar. Pulled up to 187t on hook load overpull). Increased to 2200l/min 124 bar. Casing cut at 915. 2m
14:30 - 14:45: Pulled up through 10 3/4 hanger with 10 3/4in casing, OK to pass. RIH back, released spear from 10 3/4in casing fish
14:45 - 18:00: Pulled free of fish, hung up with grapple at 139. 4m through hanger. Troubleshoot to get through. Attempted to pull with MAX 10 ton overpull no success. Pulled up slowly and rotate to the right no success. Tried to rotate to the left and pull no success. Pulled and pumped with 200l/min 4 bar, pressure increased to 30bar when took weight at 139. 4m. RIH and engaged spear inside 10 3/4in CSG, pulled same through the hanger OK. Rotated it 4. 5 turns to the left torq) to reposition casing fish inside the well. Landed fish in the well and released spear. Attempted to pull spear through hanger no success. Pulled up total of 3,4m from top of CSG stump at 141. 9m
18:00 - 21:30: Evaluated situation. Discussed w/ onshore organisation. Meanwhile manufacturing c-plate to be able to hang off weight of the inner string decided way forward pull CSG fish on spear release spear from fish instal string stab above spear engage spear on surface, RIH fish on spear release spear, POOH
21:30 - 21:45: Performed pre-job meeting to pull out fish on spear to surface
21:45 - 23:00: Engaged spear to fish. POOH fish slowly. Top of fish hang up in hanger area. Rotated string 180 deg left, pulled up. Went through when POOH observed overpull spikes on weight indicator several times. MAX spike value of 40t
23:00 - 00:00: R/b 1x stand of DC, l/d bumper sub and string stab

24-hour summary: milled 10 3/4in subsea CSG hanger dressed off 10 3/4in CSG stump cut 10 3/4in CSG at 915m released spear and attempted to pull out through milled 10 3/4in subsea CSG hanger run back, set spear inside 10 3/4in CSG, POOH w/ 10 3/4in CSG on spear