WE Report

Lessons Learned

Lessons Learned865

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

DNO
5923 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Reservoir section 17/09/2023 While sampling the MDT Saturn probe got stuck. All attempts to free with wireline tension, cycling . . .

Drilling Engineer / Morten Laget


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DNO
5924 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Reservoir section 17/09/2023 Side door overshot had to be run (provided by Archer with Archer-supplied procedures)

Drilling Engineer


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DNO
5906 – DNO

 		Deepsea Yantai Operational 25/7-11 S
Norma		 Reservoir section 03/09/2023 The primary MDT tool and BU failed. A additional MDT tool was mobilized from Deepsea Stavanger.

Drilling Engineer / Morten Laget


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DNO
5871 – DNO

 		Deepsea Yantai Planning 25/7-11 S
Norma		 01/08/2023 Difficult to see with the ROV at seabed due to poor visibility and loose seabed conduction.

Drilling Engineer / Morten Laget


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DNO
5857 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Top hole 30/07/2023 Due to problems with cement around the conductor and movement in conductor a clamp-on inclinometer . . .

Drilling Engineer / Morten Laget


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DNO
5858 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Top hole 30/07/2023 Due to problems with cement around the conductor and movement in conductor a Bullseye bracket from . . .

Drilling Engineer / Morten Laget


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DNO
5868 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Surface section 30/07/2023
The drill commenced with the Driller pressuring up the well with 30 bar.
The classic method of . . .

Drilling Engineer / Morten Laget


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DNO
5869 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 25/7-11 S
Norma		 Surface section 30/07/2023 From the start of the section after the FIT, delivery of cuttings to the ISO tanks using the CCBs . . .

Drilling Engineer / Morten Laget


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DNO
2194 – DNO

 		Borgland Dolphin Wireline / Slickline
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/10/2021 Due to the missing clamps the control lines was coiled up around the tubing and made it impossible . . .

Lars Solvang / Stig Seland



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DNO
2197 – DNO

 		Borgland Dolphin Wireline / Slickline
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/10/2021 Deep set plug failed during pressure test.

Lars Solvang / Stig Seland


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DNO
2199 – DNO

 		Borgland Dolphin Bleed of package
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/10/2021 Hydrocarbons contamination required a bleed off package to be installed.

Lars Solvang / Stig Seland



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DNO
2201 – DNO

 		Borgland Dolphin Completion
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/10/2021 Clamps holding the control lines (polyoil clamps) had disintegrated.

Lars Solvang / Stig Seland



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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
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
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
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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