WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
226 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 Neck on lower part of MPT too short for making up MPT to DP with IRN when using 13 3/8″ adapter for . . .


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Wellesley
227 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019


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Wellesley
228 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
N/A 07/02/2019


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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
231 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Rig move 07/02/2019 The rig move plan was written for using 4 AHVs. The actual rig move used 3 AHVs. Hence, the . . .


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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
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
1144 – Wellesley

Transocean Arctic HSEQ
PSA Q&A
Planning 35/12-6 S
Kallåsen
N/A 21/03/2018

I kap 6.9.1 vises det til at «Transocean Arctic verification and inspection plan for 2018» gir . . .

Karina Helle / Morten Laget


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Wellesley
1145 – Wellesley

Transocean Arctic HSEQ
PSA Q&A
Planning 35/12-6 S
Kallåsen
N/A 21/03/2018

Hvordan vil Wellesley følge opp at aktiviteter og tiltak relatert til forebygging av helserisiko . . .

Karina Helle / Morten Laget


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