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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Wellesley
201 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 05/02/2019 Tried to shear OBM mud in pits before drilling the 12 1/4″ section. At this time the well and all . . .


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Wellesley
202 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
N/A 05/02/2019 Operating with 5 deck crew, as specified in the contract, does not allow for utilizing two deck . . .


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Wellesley
203 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
N/A 05/02/2019 Column tank ST3 which was previously used for brine storage has within the last two years been . . .


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Wellesley
204 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 05/02/2019 Coating from 9 5/8″ casing blocked dices on Franks casing tong (upper jaws). Had to frequently clean . . .


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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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Wellesley
1126 – Wellesley

Transocean Arctic Drilling
PSA Q&A
Planning 35/12-7
Serin
N/A 06/04/2018

Blowout & Kill simulation report: Maximum oil blowout rate for the Serin well was found to . . .

Karina Helle / Morten Laget


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