WE Report

Lessons Learned

Lessons Learned865

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

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
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
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
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
1429 – DNO

 		Borgland Dolphin Drilling Operational A-3 HT2
Oselvar		 P&A 20/04/2021 Operations completed successfully, but forgot to flush lines from SFT to bleed-off package with . . .

Drilling Supervisor / Stig Seland



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DNO
1419 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 11/04/2021 We pressure tested the BOP in an untraditional way using a BOP jump tool. This took very long time . . .

Drilling Supervisor / Stig Seland



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DNO
1416 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 10/04/2021 Had only 1 Dolphin sub sea engineer. He had to work overtime, and OIM had to make deviation. . . .

Drilling Supervisor / Stig Seland



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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
1395 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 04/04/2021 Landing string got stuck after pulling 7 m. Possible stuck with SSTT at marine riser flex joint, OR . . .

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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DNO
1374 – DNO

 		Borgland Dolphin Drilling
Own Experience
INTERNAL		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 Other 19/03/2021
Extremely time-consuming compared to what we get in return. Render design (or just Pia . . .

Steinar Aarnes / Morten Laget


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DNO
1244 – DNO

 		Borgland Dolphin Drilling
PSA Q&A		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 31/01/2021

o Hva er back-up løsning ved manglende sement bak casing ?

Karina Helle / Morten Laget



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DNO
1245 – DNO

 		Borgland Dolphin Drilling
PSA Q&A		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 31/01/2021

o Hvordan verifiseres sement bak casing for “open hole to surface plug”?

Karina Helle / Morten Laget



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DNO
1246 – DNO

 		Borgland Dolphin Drilling
PSA Q&A		 Other A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 31/01/2021

Fra møte i september ber vi om en oppfølging av følgende aksjoner:

Actions
Based on feedback and . . .

Karina Helle / Morten Laget


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DNO
1247 – DNO

 		Borgland Dolphin Drilling
PSA Q&A		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 31/01/2021

Recommend establishing plans for handling possible trapped gas in Oselvar wells when opening the . . .

Karina Helle / Morten Laget


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DNO
1248 – DNO

 		Borgland Dolphin Drilling
PSA Q&A		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 31/01/2021

Review historical documentation regarding “Baseline Survey” performed by DONG (previous operator) . . .

Karina Helle / Morten Laget


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DNO
972 – DNO

 		No Rig Drilling
INTERNAL		 Planning No well
Gomez		 N/A 17/10/2020 No kickoff or handover to the Well Management team.

Morten Laget


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