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Lessons Learned

Lessons Learned865

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

DNO
1456 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-3 HT2
Oselvar		 P&A 03/05/2021 Both sides of the UHG can be used on the TRT but the port side of the UHG comes into conflict with . . .

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
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
1420 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 15/04/2021 Unable to jar upper crown plug free. POOH and changed to hydraulic jar. Jarred upper crown plug free . . .

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
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
1415 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 10/04/2021 Two fingers have been torn off the protective sleeve/ retainer ring on the SSTT. One finger was . . .

Sturla Jensen / 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
1417 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 10/04/2021 Heavily bending on Lubricator Umbilical approx 1,5 m from termination head for. Caused by Clamp had . . .

Sturla Jensen / Stig Seland



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DNO
1418 – DNO

 		Borgland Dolphin Subsea
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 10/04/2021
Disconnected BOP.
Inspected top of TH and crown plug.

Sturla Jensen / 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
1402 – DNO

 		Borgland Dolphin Subsea
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 07/04/2021 It was difficult to install and hold straight due to handle on the torque tool. It was also . . .

Sturla Jensen / Stig Seland



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DNO
1398 – DNO

 		Borgland Dolphin External Environment Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 06/04/2021 The OSCP should be sent to rig and PSVs 2 days prior to arrival on location, not before setting BOP . . .

Christina Sæland Rødne / 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
1400 – DNO

 		Borgland Dolphin Subsea
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 06/04/2021 Unable to install flushing cap and URF offline, operations had to be done on rig time. Not able to . . .

Øystein Prytz / Stig Seland



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