WE Report

Lessons Learned

Lessons Learned865


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

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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DNO
1222 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature.
Karina Helle / Morten Laget


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DNO
1224 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 06/05/2012 DONG handover documentation: Due to LWD tool failures on previous reservoir sections it was decided . . .

Include mud cooler in future reservoir sections with high temperature. Alternative larger coolers on . . .
Karina Helle / Morten Laget


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DNO
1226 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 06/05/2012 DONG handover documentation: The deactivation of the underreamer was not done on the bit trip due to . . .

Do not spend time deactivating unless circulating at the shoe for another reason (conditioning mud). . . .
Karina Helle / Morten Laget


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DNO
1227 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 05/05/2012 DONG handover documentation: After dropping the ball to activate the underreamer the string was . . .

As it looks like ball hangs up in string when not rotating, rotation should be initiated shortly . . .
Karina Helle / Morten Laget


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DNO
319 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Production section Deliberately added 2 m pup after log interpretation showed potentially weak limestone stringer close . . .


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