WE Report

Lessons Learned

Lessons Learned865

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

DNO
317 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Drilled section with planned mud and mud weight without problems with cavings. Cavaings identified . . .


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DNO
323 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 N/A 07/01/2019 Unplanned contamination of Versatec 1.52 sg OBM with DW – OWR increased from 70/30 to 60/40. Checked . . .


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DNO
1225 – 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 the mud cooler the mud temperature was lower, this resulted in . . .

When planning to use a mud cooler consider effects on downhole mud temperature, weight and rheology . . .
Karina Helle / Morten Laget


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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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