Hourly activities:
00:00 - 00:15: Continued performing rig maintenance.
00:15 - 00:30: Performed TBT for pressure testing cement plug. Meanwhile checked line-up and flushed lines.
00:30 - 00:45: Checked bucket sample. Sample indicated set cement. Closed BRS and attempted to pressure test cement plug to 125 bar. Pressure reached 45 bar and broke off. Stopped pumping, pressure continued to drop. Bled off pressure to cement unit. Volume pumped from 10 to 45 bar 330 ltrs. Bled back to 10 bar, 280 ltr. No increase in trip tank. Checked for surface leaks.
00:45 - 02:30: WOC for 2 hours. Meanwhile performed drops inspection on FWD PRS and performed PMS.
02:30 - 02:45: Verified line-up and attempted to pressure test cement plug to 125 bar. Pressured up to 10 bar reference pressure and stopped pumping. Pressure dropped back to 2 bar. No increase in trip tank.
02:45 - 04:00: Prepared to run RTTS. Measured 8 1/4" DC joints and verified RTTS measurements. Opened BSR and observed 600ltr instant loss on TT followed by stable lossrate of 1,08 m3/hr.
04:00 - 04:45: P/u 3 singles 8 1/4" DC from cantilever and RIH to 26 mmd. Loss rate 1,08 m3/hr
04:45 - 05:30: P/u and m/u 3 stands 8 1/4" DC from set-back and RIH from 26 mmd to 80 mmd. Loss rate 1,08 m3/hr
05:30 - 06:15: P/u and m/u the RTTS plug and storm valve. RIH to 98 mmd. Loss rate 1,08 m3/hr
06:15 - 06:30: RIH w/ RTTS plug on 5 1/2" DP from 98 mmd to 218 mmd. Loss rate 1,08 m3/hr
06:30 - 06:45: M/d TDS and took up/down weight 92/87 ton. Loss rate 1,08m3/hr
06:45 - 07:00: RIH from 218 mmd to 226 mmd and set plug above perforations on 13 3/8" CSG and below 13 3/8" CH, mid packer element at 141,7mmd. Set down 19 ton on plug. Losses stopped. Monitored well on TT.
07:00 - 09:00: Evaluated situation with onshore organisation. Meanwhile monitored well on TT. Performed PMS.
09:00 - 10:00: Lined up to drill string. Confirmed line-up. Attempted to pressure test cement inside 13 3/8" CSG and cement in annulus between 20" and 13 3/8" CSG. Pressured up below RTTS plug to 20 bar and stopped pumping. Pressure started to bleed off immedietly. Trip tank stable. Pumped 620 ltrs and bled back 130 ltrs from 10 to 20 bar. Closed IBOP and pressure tested lines to 20 bar, no surface leakages observed.
10:00 - 10:45: Lined up down kill line. Closed BOP and pressure tested RTTS plug, production riser, tie-back connector, WH and CH. Pressured up above RTTS to 50 bar/10min. Pumped 30 ltr from 10 to 50 bar. Bled back same.
10:45 - 11:00: Released RTTS plug, 92 ton up weight. Waited 3 minutes for rubber elements to retract. RIH and set RTTS plug below perforations in 13 3/8" CSG at 150 mmd packer element). Sat down 16 ton. Loss rate 1,2 m3/hr.
11:00 - 12:00: Pressure tested cement inside 13 3/8" casing. Pressured up below RTTS to 50bar/10min, OK. Pumped 10 ltrs from 10 bar to 50 bar, bled back same. Losses on TT, 1,2 m3/hr.
12:00 - 12:15: Released RTTS plug. Waited 3 minutes for rubber elements to retract.
12:15 - 12:30: POOH w/ RTTS plug and storm valve on 5 1/2" DP from 236 mmd to 98 mmd.
12:30 - 13:30: B/o storm valve. Inspected RTTS and storm valve. M/u storm valve to RTTS plug. Loss rate 1,2 m3/hr
13:30 - 13:45: RIH w/ RTTS plug on 5 1/2" DP from 98 mmd to 226 mmd.
13:45 - 14:15: Set RTTS plug at 141,7 mmd perforations in 13 3/8" CSG) w/ 4 stnd 8 1/4" DC below. Losses stopped. Backed out from storm valve, 18 turns LH. Top storm valve at 134,34 mmd.
14:15 - 14:45: POOH with RTTS RT to surface.
14:45 - 15:15: Closed BSR and pressure tested RTTS plug, production riser, tie-back connector, WH and CH. Pressured up above RTTS to 50bar/10min. Volume pumped 30 ltr, bled back same.
15:15 - 15:30: R/b RTTS RT.
15:30 - 15:45: Cleaned and cleared drill floor.
15:45 - 16:00: Performed TBT for n/d BOP and surface riser.
16:00 - 16:15: Removed elevator and installed 25t chains to TDS bails.
16:15 - 16:45: Pulled master bushing and installed pad eyes in rotary. Attached chains to pad eyes
16:45 - 17:15: Observed 80 bar on b-annulus gauge. Investigated issue, faulty gauge. Opened b-annulus valve. Observed fluid running out due to utubing.
17:15 - 17:45: Drained surface riser. Adjusted BOP tensioners and carrier. Bled off diverter over-shot.
17:45 - 19:00: Disconnected tensioner pistons. Meanwhile prepared to pull diverter.
19:00 - 19:15: Performed TBT for pulling diverter
19:15 - 20:15: Continued disconnecting cylinders and cleaned up tools in the area.
20:15 - 22:00: Pulled diverter and r/b in set back. Pulled slick joint and l/o same.
22:00 - 22:15: Performed TBT for n/d surface HP riser.
22:15 - 23:45: Disconnected nt2 connector on surface HP riser. Cleaned and inspected stump.
23:45 - 00:00: Performed TBT for moving BOP

24-hour summary: WOC. Meanwhile function tested BOP and performed rig maintenance attempted to pressure test oh to surface cement plug ran RTTS and investigated leakage installed RTTS at 141,7 mmd n/d BOP and HP surface riser