WE Report

Lessons Learned

Lessons Learned865

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

DNO
2203 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/10/2021
The point load on the boat deck was higher than allowed and 4 x 1m2 steal plates was needed under . . .

Lars Solvang / Stig Seland



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DNO
2172 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 As planned

Lars Solvang / Stig Seland



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DNO
2173 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 Weight of the black eagle hose will make alignment to the manifold flushing cap difficult.

Lars Solvang / Stig Seland



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DNO
2174 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 Extraction stopped as the hub was secured with wire bracing. These had to be cut before operation . . .

Lars Solvang / Stig Seland



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DNO
2188 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 As planned

Lars Solvang / Stig Seland



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DNO
2189 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 Two lubricator valves installed in the landing string.

Lars Solvang / Stig Seland



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DNO
2190 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 As planned

Lars Solvang / Stig Seland



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DNO
2191 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 Pulled landing string and run a tubing hanger running tool on drill pipe. Pull the completion with . . .

Lars Solvang / Stig Seland



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DNO
2192 – DNO

 		Borgland Dolphin Wireline / Slickline
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/10/2021 Pulling HXT crown plugs with slickline using a mechanical jar was not successful. Changed out to a . . .

Lars Solvang / Stig Seland



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DNO
2130 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 P&A 19/09/2021 1 hr extra rig time was unnecessarily spent to make up x-over to the RT before it could be made up . . .

Drilling Supervisor / Morten Laget


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DNO
2305 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Operational 2/5-15
Gomez		 P&A 15/09/2021 Missing Protectors for 13-3/8″ Casing

Johan Kjos-Hanssen / Morten Laget



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DNO
2111 – DNO

 		Borgland Dolphin Completion Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 14/09/2021 Disintegrated control line clamps and loose control lines increased the required overpull to be able . . .

Øystein Prytz / Stig Seland


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DNO
2093 – DNO

 		Borgland Dolphin Multi Discipline
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 23/08/2021 No lessons learnt meetings were held with the offshore team (DSV and DE) during operations.

Øystein Prytz / Stig Seland



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DNO
2006 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 02/08/2021 When pulling 13 3/8″ seal assembly on other wells the choke and kill line failsafes were open . . .

Drilling Supervisor / Stig Seland



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DNO
2005 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 28/07/2021 Volume required was larger that expected for first 20 bar. However from 20 bar to 50 bar the volume . . .

Drilling Supervisor / Stig Seland



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DNO
2004 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 27/07/2021
Franks tong was moved into the drill floor from the starboard tool landing are on the skate through . . .

Drilling Supervisor / Stig Seland



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DNO
1994 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H
Oselvar		 P&A 21/07/2021 Bottom 0.5 m of the toolstring is the Ultrasonic rotating IBCS-E sub. This sub has a larger OD . . .

Drilling Supervisor / Stig Seland



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DNO
1993 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H
Oselvar		 P&A 19/07/2021 Jacked 9 5/8″ free using Baker Mastodon jacking tool. Used 49 pressure cycles to jack casing 17 m, . . .

Drilling Supervisor / Stig Seland



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DNO
1990 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 13/07/2021 Set 20″ EZSV at 694,5 m according to procedure. Tagged EZSV with 10 t. Pressured up to 50 bar, no . . .

Drilling Supervisor / Stig Seland



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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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