WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
223 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019


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Wellesley
231 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Rig move 07/02/2019 The rig move plan was written for using 4 AHVs. The actual rig move used 3 AHVs. Hence, the . . .


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Wellesley
176 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 5 MT WOB proved insufficient, no drilling progress in hard formation. Was allowed to increase to 10 . . .


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Wellesley
177 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 The 50-80 RPM range given in HSG was insufficient. There was a need to rotate bit & BHA faster . . .


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Wellesley
178 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 ECD calculation in SG EMW done by the MWD softwaremight not be intuitive. The SG is normally . . .


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Wellesley
185 – Wellesley

Transocean Arctic Logistics Operational 35/12-7
Serin
Reservoir section 05/02/2019 Stethoscope tool became primary means of taking pressure acquisition. Initial 14 pressure points . . .


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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
188 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Paintjob was not successful. All paint washed off during job.


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Wellesley
189 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Observed 3 1/2″ cmt. Stinger partially plugged with debris and cement on POOH after having set 4 . . .


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Wellesley
193 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Equipment sent out did not include specialized eq for cut and pulling 30″ and 20″ casing in case the . . .


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DNO
296 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
N/A 07/01/2019 Did not include the sidetracks.


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DNO
299 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
N/A 07/01/2019 Did not have updated presentation for the meetings, after scope change of well.


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DNO
303 – DNO

Island Innovator Drilling Planning 6507/7-16 S
Canela
N/A 07/01/2019 Geological target boxes developed late in planning phase. This resulted in less time for evaluating . . .


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Faroe
159 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Surface section 28/09/2017 Painted lengths on 13 3/8″ casing from town was actual lengths, not M/U lengths. This might cause . . .


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Faroe
160 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Surface section 28/09/2017 During M/U 18 3/4″ WHH, threads got cross threaded from side to side when moving the 18 3/4″ WHH. . . .


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Faroe
165 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Reservoir section 28/09/2017 Logged liner cement with USIT/CBL. Initial evaluation results offshore showed bad/no cement present. . . .


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Faroe
167 – Faroe

Deepsea Bergen Well test Operational 31/7-2 S
Brasse Appraisal
N/A 28/09/2017 N/A


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Faroe
171 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal
Intermediate section 28/09/2017 Skips were not practical and required a lot of manual handling to operate. The lids are heavy and . . .


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Faroe
172 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal
Intermediate section 28/09/2017
After making up the 9 5/8″ liner hanger circulation was attempted established with 2000 lpm. Losses . . .


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