WE Report

Lessons Learned

Lessons Learned865


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

DNO
325 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
N/A 07/01/2019 Only one subsea engineer on rig.


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DNO
326 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
N/A 07/01/2019 Fluid slopping into flowline from shaker pits due to Free Surface Effect during periods of high rig . . .


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DNO
1231 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
N/A 06/06/2012 DONG handover documentation: The OCG 15 section 8.51 states to pump TSW when pressure testing the . . .

Use normal SW, this is available at the cement unit. The fluid will anyway be bleed back after . . .
Karina Helle / Morten Laget


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DNO
1229 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
N/A 12/05/2012 DONG handover documentation: Confusion due to joints marked with two different joint numbers (in . . .

If reuse of pipe: Hide old joint number with paint and mark with new number. Use either white or . . .
Karina Helle / Morten Laget


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DNO
1230 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
N/A 12/05/2012 DONG handover documentation: Again challenges where seen due to backflow when RIH on DP / HWDP. . . .

In future include a flapper valve in the running string. Either below hanger setting tool (just . . .
Karina Helle / Morten Laget


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DNO
1228 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
N/A 11/05/2012 DONG handover documentation: When drilling 8-1/2″ with 9-1/4″ underreamer a section of the hole was . . .

When circulating at TD, position string so calliper can verify ID’s above and below UR shoulder. If . . .
Karina Helle / Morten Laget


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