WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
207 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 AxeBlade Bit performed well, did not create stick-slip.


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Wellesley
211 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 The pump strokes and volume pumped (from pit sensors) matched very well from 0-83 m3 mud pumped . . .


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Wellesley
212 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 All 3 wiper plug shears & burst were clearly seen during this cement job; bottom plug shear, top . . .


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Wellesley
179 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 The cuttings were encapsulated with mud, very little hydration, dry and crisp inside.


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Wellesley
187 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Reduced to 10 m3 which made a massive difference to the amount of slop generated and skips filled.


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Wellesley
190 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 TOA’s acoustic BOP pressure sensor was successfully used to monitor backpressure exerted on the well . . .


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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
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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Faroe
157 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
P&A 28/09/2017 Drilled 36″ hole with 36″ bit at 21 m/hr on bottom ROP without problems maintaining verticality.


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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
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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