WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
258 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 The mud engineer made a good displacement plan for displacing the well from SW to 1.25 sg mud. The . . .


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Wellesley
211 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 The pump strokes and volume pumped (from pit sensors) matched very well from 0-83 m3 mud pumped . . .


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Wellesley
213 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 Trip sheet from Geoservice and Transocean has shown different numbers. In addition, gains have been . . .


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Wellesley
214 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Investigated two sensor systems in TT.


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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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