Hourly activities:
00:00 - 01:00: Continued POOH with spear assy from 780 mmd to 40 mmd.
01:00 - 01:30: Retrieved drift. Pulled spear to surface and r/b same.
01:30 - 01:45: Performed TBT for retrieving surface MS-T seal assembly
01:45 - 02:00: Cleaned and cleared drill floor. Removed PS-21 slips and installed master bushing.
02:00 - 03:30: P/u and function tested MS-T seal retrieval tool
03:30 - 04:00: RIH with MS-T seal retrieval tool. Landed out on energizing ring threads. Enganged retrieval tool.
04:00 - 04:30: Pressured up energizing lock ring line to 103 bar and bled off pressure in line. Released MS-T seal assembly
04:30 - 04:45: M/u TDS and pulled free seal assembly with 51 ton overpull. Retrieved MS-T seal to surface.
04:45 - 05:15: B/o retrieval tool and l/o same
05:15 - 05:45: Cleaned and cleared drill floor and removed casing tong
05:45 - 06:00: Performed TBT for cutting 10 3/4" tie-back casing
06:00 - 06:15: P/u cutter/spear assembly
06:15 - 06:30: RIH with cutter/spear assembly to 126 mmd
06:30 - 07:15: Broke circulation. Staged up pumps to 500 LPM 76 bar. Recorded up/down weight 74 71 ton.
07:15 - 07:45: Positioned cutter at 126 mmd and cut casing. Observed positive indications of cut.
07:45 - 08:45: Pumped out of hole with 280 LPM from 126 mmd to 21 mmd.
08:45 - 09:15: Attempted to engage spear several times, no positive indications of latch.
09:15 - 09:30: POOH to surface and discovered CH and tie-back casing was coming out with spear assy. Observed spear not properly latched. Attempted to release spear on surface.
09:30 - 10:30: Closed annular with 400 psi and lined up through choke. Attempted to release spear while rotating and pumping at 2000 LPM 21 bar.
10:30 - 11:00: Performed TBT and discussed way forward
11:00 - 13:00: R/u casing tong and elevator
13:00 - 13:30: Pulled out CH and 10 3/4" tie-back casing, total length 6,7m. Observed that adjustment sub had parted.
13:30 - 13:45: L/o cutter/spear assy with fish.
13:45 - 14:15: Discussed way forward. Meanwhile changed out elevator
14:15 - 14:45: R/d casing tong
14:45 - 17:00: P/u ITCO spear and re-configured BHA to fish 10 3/4" tie-back casing.
17:00 - 17:15: RIH and engaged spear. Up/down weight 72 69 ton.
17:15 - 17:45: POOH with spear and fish. Secured 10 3/4" tie-back casing in rotary. Released spear and r/b same. Internal thread sleeve from adjustment sub stuck at grapple.
17:45 - 19:00: R/u casing tong and changed dices to 11 3/4" for breaking out remaining slick part of adjustment sub. Attempted to break connection between casing pup and adjustment sub
19:00 - 19:15: Performed TBT for using rig tongs to break connection between casing and adjustable sub
19:15 - 21:45: Re-built dog collar to lift adjustable sub. Prepared rig tongs to break connection. Rig tongs not big enough to break connection on adjustable sub Meanwhile located bigger dies for casing tong and installed same. Broke connection between adjustable sub and casing with casing tong. L/o fish.
21:45 - 22:00: Performed TBT for pulling and l/o 10 3/4" tie-back casing.
22:00 - 00:00: POOH with 10 3/4" tie-back casing from 100 mmd to surface.

24-hour summary: retrieved MS-T surface seal assy cut 10 3/4" surface tie-back casing at 126 mmd pulled 10 3/4" surface tie-back casing attempted to release tie-back adapter