WE Report

Lessons Learned

Lessons Learned865

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

DNO
8328 – DNO

 		Deepsea Yantai Drilling Operational 35/10-13
Kjøttkake		 Surface section 20/02/2025 Having KCL level at 200 kg/m3 was a success factor to drilling section.

Stein-Petter Slatlem


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DNO
5919 – DNO

 		Deepsea Yantai Drilling Operational 25/7-11 S
Norma		 N/A 10/09/2023 Done as per plan. For the coring operations a new LCM pill was mixed. The LCM from the 8 1/2″ . . .

Drilling Engineer / Morten Laget


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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
301 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 N/A 07/01/2019 DNO subsurface department wanted to use new OBM for drilling the sidetrack reservoir section.


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DNO
312 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Intermediate section 07/01/2019 The 17 1/2″ section was drilled, but it proved difficult to get hold of Glycol for the KCl mud.


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DNO
314 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Intermediate section 07/01/2019 KCl WBM was used for drilling the 17 1/2″ section to 1200 m. The hole was observed in good condition . . .


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DNO
315 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 Intermediate section 07/01/2019 Had to increase MW from the planned 1.48 sg to 1.52 sg at TD due to cavings.


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DNO
316 – DNO

 		Island Innovator 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
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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