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Lessons Learned

Lessons Learned865

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

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
2012 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Top hole 12/08/2021 ROV was only equipped with standard jetting tool with low flowrate, unable to remove larger amounts . . .

Drilling Supervisor / Morten Laget



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DNO
1994 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational A-1 H
Oselvar		 P&A 21/07/2021 Bottom 0.5 m of the toolstring is the Ultrasonic rotating IBCS-E sub. This sub has a larger OD . . .

Drilling Supervisor / Stig Seland



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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
1970 – DNO

 		Borgland Dolphin Drilling Operational A-3 HT2
Oselvar		 P&A 05/07/2021 The 9 5/8″ casing hanger had a 10″ pup joint made up to it This was not identified on the hanger . . .

Drilling Engineer / Stig Seland



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DNO
1969 – DNO

 		Borgland Dolphin Drilling Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 01/07/2021
Drill crew observed that Slips for perforating guns came out
to rig without handles.

Øystein Prytz / 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
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
1466 – DNO

 		Borgland Dolphin Well test
Experience Transfer Meeting		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 P&A 09/05/2021
The distance between the Archer pump to grease head is 40+ meters, with the hose full of grease it . . .

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
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
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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