WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
6455 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Observed flowback of the mud lost while running and cementing 9 5/8″ casing. Of ±200 m3 of mud lost, . . .

Drilling Engineer / Morten Laget



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Wellesley
6456 – Wellesley

COSLPromoter Drilling
Own Experience
Operational 35/10-12 S
Gnomoria
P&A 05/07/2024 Discussion about the risk of accidentally pulling the seal assembly free (no outer lock ring . . .

Drilling Engineer / Morten Laget



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Wellesley
5845 – Wellesley

Deepsea Yantai Drilling
Own Experience
Operational 35/10-10S
Carmen
P&A 12/07/2023 Pulled casing hanger with upper annular closed and C&K lines closed.

Drilling Engineer / Morten Laget


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Wellesley
3246 – Wellesley

Borgland Dolphin Drilling
Own Experience
Operational 36/1-4
Hemispheres
P&A 29/01/2022
Cement plug was pumped without incident, POOH through cement was without incident. Circulated clean . . .

Drilling Supervisor / Morten Laget



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Wellesley
552 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
P&A 21/09/2020
Ran through BOP while jetting from top of BOP and landed out on top of wear bushing without hanging . . .

Drilling Supervisor


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Wellesley
553 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
P&A 21/09/2020
Re-dressed DQ MPT tool after retrieving 9 5/8″ wear bushing. RIH and jetted through BOP at high rate . . .

Drilling Supervisor


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Wellesley
519 – Wellesley

Borgland Dolphin Drilling Planning 6204/11-3
Schweinsteiger
P&A 17/09/2020 Evaluated if joining the Rig Chase Campaign would be beneficial compared to the original plan using . . .

Elisabeth Vik


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Wellesley
250 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
P&A 16/06/2020 N/A


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Wellesley
251 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
P&A 16/06/2020 N/A


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Wellesley
261 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 After unlatching the BOP we forgot to remove the AX ring from the wellhead prior to pulling the BOP. . . .


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Wellesley
262 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 The Weatherford MOST tool was successfully used in rotary mode. The tool was dressed such that the . . .


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Wellesley
263 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 As on all previous wells, with the well displaced to seawater and wellhead cutting operations . . .


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Wellesley
265 – Wellesley

Transocean Arctic Drilling Operational 25/1-13
Balcom
P&A 16/06/2020 Unable to run Weatherford 9 5/8″ casing cuting assembly past wellhead. Found out that spiral . . .


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Wellesley
221 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 Not enough cuttings skips for P&A cement plugs.


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Wellesley
222 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 Halliburton planned for 15 m3 spacer for an 11 m3 slurry volume.


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Wellesley
223 – Wellesley

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


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Wellesley
224 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 WOC for cement plugs in OBM prior to dressing off.


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Wellesley
225 – Wellesley

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


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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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