WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
196 – Wellesley

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


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Wellesley
197 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 A large volume (350 m3) bentonite mud was mixed before running casing for filling casing, emergency . . .


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Wellesley
198 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Surface section 05/02/2019 Had trouble making up casing correctly due to movement of casing in slips. Had to back out several . . .


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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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