WE Report

Lessons Learned

Lessons Learned865

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

DNO
1991 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 13/07/2021 Pulled pack off assembly free. Flow checked well. Pulled MPT with pack off assembly above BOP. . . .

Drilling Supervisor / Stig Seland



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DNO
1457 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 03/05/2021 Concerns were raised that with the HXT landed on the 105 ton skid as planned the bumper bars on the . . .

Drilling Supervisor / Stig Seland



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DNO
1426 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 20/04/2021
Evaluated rig-up and HXT valve and BOP status. Changed HXT valve status to the following: opened LPR . . .

Drilling Supervisor / Stig Seland



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DNO
1427 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 20/04/2021
Optimised process as follows:
Lined up rig BOP Lower Kill line to rig choke manifold and . . .

Drilling Supervisor / Stig Seland



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DNO
1396 – DNO

 		Borgland Dolphin Well test
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 05/04/2021 We discussed the option 1) of hanging the entire landings string with Wellsafe Explorer weak links, . . .

Drilling Supervisor / Stig Seland



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DNO
986 – DNO

 		Borgland Dolphin Other Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 05/11/2020 Went through the detailed operational steps early in the planning phase (DG2) with relevant . . .

Øystein Prytz


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DNO
1160 – DNO

 		Borgland Dolphin Multidicipline
Experience Transfer Meeting		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 08/09/2020
Site visit and good communication.
Good rig-to-platform interface.
High level of support during . . .

Actions Required for Oselvar: Plan for site visits
Interface management
Proper facilitation of . . .
Karina Helle / Morten Laget



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DNO
1161 – DNO

 		Borgland Dolphin HSEQ
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 08/09/2020 Low reactive safety figures.

Actions Required for Oselvar: Look into a system for follow up of safety performance
Karina Helle / Morten Laget



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DNO
1162 – DNO

 		Borgland Dolphin Multidicipline
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 08/09/2020
Efficient switch to suspension mode.
Flexibility due to Covid-19.

Actions Required for Oselvar: Prepare for contingencies
Karina Helle / Morten Laget



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DNO
1163 – DNO

 		Borgland Dolphin Logistics
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 08/09/2020
Experience transfer meeting, Schooner & Ketch: Efficient mibilisation and backload
Minimal best . . .

Karina Helle / Morten Laget



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DNO
314 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Intermediate section 07/01/2019 KCl WBM was used for drilling the 17 1/2″ section to 1200 m. The hole was observed in good condition . . .


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DNO
316 – DNO

 		Island Innovator Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Drilled section with planned mud and mud weight without problems with cavings. Cavaings identified . . .


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DNO
317 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Drilled section with planned mud and mud weight without problems with cavings. Cavaings identified . . .


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DNO
320 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Great care taken breaking circulation at casing TD/washing down to land off. Used 100 lpm steps, . . .


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DNO
321 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 High values of LOT/FIT expected; 1.95 sg EMW. Value of ESD measured by LWD tool ahead of FIT was . . .


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DNO
1223 – DNO

 		Borgland Dolphin HSEQ
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature.
Karina Helle / Morten Laget


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DNO
1224 – DNO

 		Borgland Dolphin Drilling
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature. Alternative larger coolers on . . .
Karina Helle / Morten Laget


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DNO
319 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section Deliberately added 2 m pup after log interpretation showed potentially weak limestone stringer close . . .


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