WE Report

Lessons Learned

Lessons Learned865


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

DNO
1221 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 22/04/2012 DONG handover documentation: During the scraping of the EZSV plug and Whipstock setting area the . . .

To avoid problems with hole instability during circulation (losses) the lowering of the mudweight . . .
Karina Helle


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DNO
1220 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 15/04/2012 DONG handover documentation: Started to get backflow when running the last 10 joints of blank pipe . . .

Change the OCG to prevent using excessive time on this in the future. Prepare a pit with heavy . . .
Karina Helle / Morten Laget


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DNO
1219 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 25/03/2012 DONG handover documentation: When running in with the seal assembly on MUT, the bullnose on the pipe . . .

In future run one more stand below MUT, so bullnose is stabbed into casing before picking up seal . . .
Karina Helle / Morten Laget


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DNO
1217 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 24/03/2012
DONG handover documentation:
When circulating prior to cementing initial pressure was 79 bar / . . .

Karina Helle / Morten Laget


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DNO
1218 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 24/03/2012 DONG handover documentation: The Odfjell CRTi (Casing Running Tool internal) was used to fill casing . . .

If using CRTi as a contingenct again is should be used together with auto filling shoe, this way . . .
Karina Helle / Morten Laget


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DNO
1216 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Production section 11/03/2012 DONG handover documentation: While running the 13 3/8″ casing, the casing tong was not lowered all . . .

Karina Helle / Morten Laget


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