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Lessons Learned

Lessons Learned865

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Operator Rig Discipline / Origin Project Phase Well Section Date What Happened

Wellesley
248 – Wellesley

 		Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak		 Reservoir section 16/06/2020 Max flowrate for extracting formation fluid with the FTWT tool was said to be 6-7 lpm. During this . . .


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Wellesley
261 – Wellesley

 		Transocean Arctic Drilling Operational 35/4-2
Songesand		 P&A 16/06/2020 After unlatching the BOP we forgot to remove the AX ring from the wellhead prior to pulling the BOP. . . .


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Wellesley
262 – Wellesley

 		Transocean Arctic Drilling Operational 35/4-2
Songesand		 P&A 16/06/2020 The Weatherford MOST tool was successfully used in rotary mode. The tool was dressed such that the . . .


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Wellesley
263 – Wellesley

 		Transocean Arctic Drilling Operational 35/4-2
Songesand		 P&A 16/06/2020 As on all previous wells, with the well displaced to seawater and wellhead cutting operations . . .


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PGNiG
396 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 N/A 13/03/2020 More slops backloaded than planned using Halliburton BSS. Amount of slop backloaded; 836 m3 + 200 m3 . . .


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PGNiG
342 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Pilot hole section 22/10/2019 BHA modules coming out with various lifting subs.


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PGNiG
361 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Production section 22/10/2019 Cement stand is big and difficult to handle. Time consuming to rack back and lay out. Cement stand . . .


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PGNiG
372 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Problems with gas readings from gas trap with flow less than 2000 lpm. Gas trap installed in flow . . .


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PGNiG
380 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Circulating after releasing 9-5/8” hgr.


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PGNiG
381 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Reservoir section 22/10/2019 Circulating beneath annular for potential gas (ie on pulling seal assy)


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PGNiG
383 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Production section 22/10/2019 Had to stop operations to fix a leak in TDX s-pipe connection – 2x o-rings.


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PGNiG
384 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Production section 22/10/2019 NOV software did not include the PGNiG well so PGNiG personnel unable to see it – only seen in . . .


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PGNiG
337 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Top hole 21/10/2019
When running conductor 0.5 m higher stick-up was observed.
Base plan was to hold the conductor . . .


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PGNiG
338 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Top hole 21/10/2019
Slow ROP with 36″ x 42″ BHA, due to keeping neutral point below seabed, it limited the drilling . . .


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PGNiG
339 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Top hole 21/10/2019 Rigged up for conductor running, extra 20 ft mobilized for the operation.


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PGNiG
340 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Pilot hole section 21/10/2019 BHAs racked offline; very tight tolerances with racking boards and stabilizers etc. Same crew that . . .


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PGNiG
341 – PGNiG

 		Deepsea Nordkapp Drilling Operational 6507/5-9 S, 6507/5-9 A
Shrek		 Pilot hole section 21/10/2019 Debris and cuttings could congregate around the subsea WHIM as cuttings would not go to surface . . .


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Faroe
291 – Faroe

 		Transocean Arctic Drilling Operational 31/7-3 A
Brasse		 Reservoir section 03/10/2019 It took 5 hours to drill the wiper plugs in the Weatherford liner. This is twice as long as normal. . . .


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Faroe
292 – Faroe

 		Transocean Arctic Drilling Operational 31/7-3 A
Brasse		 Reservoir section 03/10/2019 Stuck with wireline toolstring 1A ZAIT-PEX-PPC-MSIP-PPC-NGI-XPT at 2831 m, bottom of toolstring and . . .


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Faroe
293 – Faroe

 		Transocean Arctic Drilling Operational 31/7-3 A
Brasse		 Reservoir section 03/10/2019 Performed cut and thread operation to free stuck wireline cable and fish wireline toolstring 1A. . . .


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