WE Report

Lessons Learned

Lessons Learned865

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

DNO
8433 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 35/10-13
Kjøttkake		 Production section 15/03/2025 Not able to get BOP test – Burst seal on CHSART

Ole Marius Serigstad / Stig Seland


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DNO
8394 – DNO

 		Deepsea Yantai Drilling
Own Experience		 Operational 35/10-13
Kjøttkake		 Production section 07/03/2025 KOP set on ACST tool above 9 5/8” casing cut at ~1192 m to 1051 m (47 m inside 20” casing – shoe at . . .

Ole Marius Serigstad / Stig Seland


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DNO
2110 – DNO

 		Borgland Dolphin Subsurface
Own Experience		 Operational A-1 H, A-2 H, A-3 HT2
Oselvar		 Production section 08/09/2021 The results from the pressure test caused some initial confusion regarding if the test was . . .

Øystein Prytz / Stig Seland


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DNO
2099 – DNO

 		Borgland Dolphin Drilling
Own Experience		 Operational 2/5-15
Gomez		 Production section 29/08/2021
The NORM instrument was found finally found on the drillfloor, however in an unmarked black . . .

Drilling Engineer / Morten Laget


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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
320 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 Great care taken breaking circulation at casing TD/washing down to land off. Used 100 lpm steps, . . .


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DNO
321 – DNO

 		Island Innovator Drilling Operational 6507/7-16 S
Canela		 Production section 07/01/2019 High values of LOT/FIT expected; 1.95 sg EMW. Value of ESD measured by LWD tool ahead of FIT was . . .


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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
1223 – DNO

 		Borgland Dolphin HSEQ
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
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
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
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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