WE Report

Lessons Learned

Lessons Learned865

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

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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DNO
2117 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Other 13/07/2021 Did not not get enough plates from rig and.

Johan Kjos-Hanssen / Stig Seland



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DNO
1968 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 30/06/2021 Initially believed that we did not get a good pressure test (Formation Integrity Test). Suspected . . .

Drilling Supervisor / Stig Seland



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DNO
1930 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 29/06/2021 We had a lot of friction in a long and deviated well A3 with brine.

Drilling Supervisor / Stig Seland



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DNO
1916 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 23/06/2021 Cleaning of pulled XMT onshore at base. Major onshore handling operations.

Johan Kjos-Hanssen / Stig Seland



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DNO
1554 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 03/06/2021 Overtorqued connection required cold cutting

Drilling Supervisor / Stig Seland



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DNO
1547 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 29/05/2021 Camera not able to get a 360 view as it was off center

Lars Solvang / Stig Seland



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DNO
1546 – DNO

 		Borgland Dolphin Multi Discipline
Own Experience
INTERNAL		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 27/05/2021 Unstable and sometimes no connection at all. Poor sound quality during meetings with the rig.

Øystein Prytz / Stig Seland



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DNO
1532 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Other 26/05/2021 Delay on helicpoter with 3,5 hours. People hungry at the heliport and miss out the Lunch onboard the . . .

Johan Kjos-Hanssen / Stig Seland



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DNO
1531 – DNO

 		Borgland Dolphin Logistics
Own Experience		 Planning A-1 H, A-2 H, A-3 HT2
Oselvar		 N/A 21/05/2021 Max PAX during operations landed on 16 PAX in even good flying conditions and personnel was bumped . . .

Johan Kjos-Hanssen / Stig Seland



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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
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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