WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
252 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Top hole 16/06/2020 When cement was in place and 10 MT weight was slacked off conductor to set it on bottom, noticed the . . .


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Wellesley
220 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Not enough weight on jar when drilling with 8 1/2″ rock bit in order to drill with jar in tension. . . .


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Wellesley
222 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 Halliburton planned for 15 m3 spacer for an 11 m3 slurry volume.


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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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