WE Report

Lessons Learned

Lessons Learned865

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

DNO
5097 – DNO

 		Deepsea Yantai Multi Discipline
Own Experience
INTERNAL		 Planning 25/7-11 S Other 22/03/2023 Drilling Engineers have been using online software called The Engineering ToolBox. This software . . .

Stian Engvik / Morten Laget


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DNO
4761 – DNO

 		No Rig Drilling
Own Experience		 Planning No well N/A 10/08/2022 In DG1-DG2 rig screening strategy the project landed on 1.5 or Dual derrick rig and all time and . . .

Zol Mollaeian / Sigve K. Næsheim


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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
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
2096 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Surface section 22/08/2021 DrilQuip MPT and BOP test tool was sent out without pup joints.

Drilling Supervisor / Morten Laget


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DNO
2010 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Top hole 12/08/2021 We could not store enough Tuned Light cement on two cmt silos on the rig to get the required volume . . .

Drilling Supervisor / Morten Laget


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DNO
2011 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Rig move 12/08/2021 Scope of work was not sent to OIM or DSV before job. Two men from Schlumberger arrived at rig to . . .

Drilling Supervisor / Morten Laget


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DNO
1992 – DNO

 		Borgland Dolphin C&P
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 14/07/2021 Sometimes invoice dates does not match with actual backload dates

Drilling Engineer / Stig Seland



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DNO
1446 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 26/04/2021 A week’s work trying to pull completion, high overpulls throughout, over 200 plastic clamps lost . . .

Drilling Supervisor / Stig Seland



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DNO
1432 – DNO

 		Borgland Dolphin External Environment
NEA Q&A		 Planning 2/5-15
Gomez		 23/04/2021

Lack of justification why BO rates are lower in ST than MB, as the ST is 500 m deeper and length of . . .

Christina Sæland Rødne / Morten Laget



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DNO
1433 – DNO

 		Borgland Dolphin External Environment
NEA Q&A		 Planning 2/5-15
Gomez		 23/04/2021

Change in regulation §66 – contingency chemicals does not include chemicals used for lost . . .

Christina Sæland Rødne / Christina Sæland Rødne



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DNO
1436 – DNO

 		Borgland Dolphin External Environment
NEA Q&A		 Planning 2/5-15
Gomez		 23/04/2021

Hearing comment from Directorate of Fisheries: The ERACA/AfD lack information about sea mammals that . . .

Christina Sæland Rødne / Christina Sæland Rødne



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DNO
1425 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 20/04/2021
Total planned well volume was 150 m3 (tubing 50 m3, annulus 100 m3). After pumping 81 m3 the rig . . .

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
1428 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 20/04/2021
Ran tubing cutter in one assembly to avoid arming tool after assembling in sections.
Near perfect . . .

Drilling Supervisor / Stig Seland



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DNO
1421 – DNO

 		Borgland Dolphin Rig Intake
Own Experience
INTERNAL		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 Other 15/04/2021 When performing a joint rig intake for several operators (DNO, IOG and Wellesley) it is very time . . .

Åse Kristin Pettersen / Morten Laget


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DNO
1413 – DNO

 		Borgland Dolphin Drilling
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 08/04/2021 Difficult to find the relevant risks in a very comprehensive risk register

Anniken Meisler / Anniken Meisler


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DNO
1399 – DNO

 		Borgland Dolphin Drilling
Own Experience
INTERNAL		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 06/04/2021 Mail sent to IDS 15.03.21 (Monday) with set up requirements including feedback from DNO. No progress . . .

Øystein Prytz / Stig Seland



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DNO
1397 – DNO

 		Borgland Dolphin Drilling Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 05/04/2021 The DOPs was in the best intention written very detailed, with exact description of many small . . .

Drilling Supervisor / Stig Seland



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DNO
1376 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 27/03/2021 A lot of changes in start of the operation. Change of document name, change of specific lines, . . .

Drilling Engineer / Stig Seland



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