WE Report

Lessons Learned

Lessons Learned865


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

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
184 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Production section 05/02/2019 Had to lay out several joints due to missing threads on top of pin ends, (9 5/8″, #53.3, P-110, . . .


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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
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
194 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 The stop ring for balloon centralizer on the inner string cmt stinger was installed on top of . . .


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Wellesley
195 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 The WHIM or “funnel” on the seabed for pumping mud up to the rig, filled up with gumbo and large . . .


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Wellesley
196 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 N/A


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Wellesley
199 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 The Franks CRTi tool was made up to top drive before csg entered OH. With the water depth and OH . . .


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Wellesley
200 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 Disadvantage of using MRR system: Drilling top hole with reactive clay formations using mud will . . .


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Wellesley
205 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 05/02/2019 Double float valves in shoe failed at around 900 m, still inside 13 3/8″ casing. Mud flowed back . . .


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