WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
229 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 The cutting assembly was spaced out wrong from Slb in town. Bull nose and bottom stab below cutter . . .


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Wellesley
230 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 Both primary and secondary cutter assembly was delivered with 6 5/8″ handling subs, torqued up to 50 . . .


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Wellesley
186 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Halliburton recommended to rotate the string while setting the P&A plugs, but did not supply a . . .


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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
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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Wellesley
191 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019


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Wellesley
192 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
P&A 05/02/2019 Believed that the HP housing lock ring was not set or only partially set, alternatively it was . . .


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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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